WO2021038864A1 - Electric motor driving device, air-conditioner, and refrigeration cycle apparatus - Google Patents

Electric motor driving device, air-conditioner, and refrigeration cycle apparatus Download PDF

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Publication number
WO2021038864A1
WO2021038864A1 PCT/JP2019/034258 JP2019034258W WO2021038864A1 WO 2021038864 A1 WO2021038864 A1 WO 2021038864A1 JP 2019034258 W JP2019034258 W JP 2019034258W WO 2021038864 A1 WO2021038864 A1 WO 2021038864A1
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WIPO (PCT)
Prior art keywords
electric motor
connection
power supply
unit
feedback current
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PCT/JP2019/034258
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French (fr)
Japanese (ja)
Inventor
有澤　浩一
啓介 植村
智 一木
和徳 畠山
厚司 土谷
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021541948A priority Critical patent/JP7221400B2/en
Priority to PCT/JP2019/034258 priority patent/WO2021038864A1/en
Publication of WO2021038864A1 publication Critical patent/WO2021038864A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Definitions

  • the present invention relates to an electric motor drive device for driving an electric motor, and an air conditioner and a refrigeration cycle device provided with the electric motor drive device.
  • Patent Document 1 the rotation speed of the motor is changed by using an inverter having a variable frequency and a variable voltage, and the connection state of the stator winding is switched between the star connection and the delta connection according to the load. , Electric motor drive devices with reduced power consumption and increased efficiency are described.
  • connection switching motor that performs such connection switching is used as a compressor for an air conditioner
  • star connection under intermediate conditions (also called “low load conditions") that contribute to annual power consumption, resulting in a high load.
  • intermediate conditions also called “low load conditions”
  • the inverter output current and winding current have the same magnitude in star connection, but in delta connection, the inverter output current is ⁇ 3 times the winding current. Therefore, in the connection switching motor, the winding impedance differs depending on the connection specifications and needs to be taken into consideration in driving the motor.
  • a weak current leaks to the ground via the floating capacitance between the electric motor and the ground.
  • the weak current may go further to the power source via the ground.
  • the magnitude varies depending on the environment, it is known that a weak current passing through the ground flows out to the outside of the device as common mode noise.
  • the present invention has been made in view of the above, and when the connection switching motor is driven by any connection specification of star connection or delta connection, the outflow of common mode noise can be prevented by a relatively simple and inexpensive means.
  • the purpose is to obtain an electric motor drive device that can be suppressed.
  • the present invention is an electric motor drive device for driving an electric motor having a total of 6 lead wires drawn out with the neutral point separated.
  • the electric motor drive device includes a connection switching unit that switches each phase winding of the electric motor to either star connection or delta connection, and a power supply unit that generates electric power to be supplied to the electric motor.
  • the electric motor drive device has a power conversion unit that converts the voltage of DC power supplied from the power supply unit into AC power of a voltage of an arbitrary AC frequency, and a common mode in which the power conversion unit returns to the power supply unit via the electric motor.
  • a feedback current adjusting unit for adjusting a feedback current including a current is provided.
  • the electric motor drive device According to the electric motor drive device according to the present invention, it is possible to suppress the outflow of common mode noise by a relatively simple and inexpensive means regardless of whether the connection switching electric motor is driven by the connection specifications of star connection and delta connection. It has the effect of being able to do it.
  • the figure which shows the structural example of the feedback current adjustment part shown in FIG. The figure which shows the configuration example when the AC / DC converter is included in the power-source part shown in FIGS. 1 and 6.
  • FIG. 8 The figure which shows the configuration example different from FIG. 8 when the AC / DC converter is included in the power-source part.
  • the figure which shows the configuration example which is different from FIG. 8 and FIG. A block diagram showing an example of a hardware configuration that realizes the function of the control unit according to the first embodiment.
  • FIG. 1 is a diagram showing a configuration of an electric motor drive device 100 according to a first embodiment.
  • FIG. 2 is a diagram showing a configuration of a DC / AC converter as an example of the power conversion unit 4 in the first embodiment.
  • FIG. 3 is a diagram showing a configuration example of the connection switching unit 3 and the first connection state in the first embodiment.
  • FIG. 4 is a diagram showing a configuration example of the connection switching unit 3 and the second connection state in the first embodiment.
  • FIG. 5 is a diagram showing a configuration example of the feedback current adjusting unit 5 according to the first embodiment.
  • the electric motor drive device 100 includes a power supply unit 110, a control unit 200, a connection switching signal transmission unit 210, a drive signal transmission unit 220, and a feedback selection signal transmission unit 230.
  • the power supply unit 110 includes a power supply unit 1, a feedback current adjusting unit 5, a power conversion unit 4, and a connection switching unit 3.
  • the connection switching unit 3 switches each phase winding of the motor 2 to either star connection or delta connection.
  • the power supply unit 1 generates electric power to be supplied to the electric motor 2.
  • the power conversion unit 4 converts the voltage of the DC power supplied from the power supply unit 1 into AC power having a voltage of an arbitrary AC frequency, and supplies the converted power to the electric motor 2.
  • the feedback current adjusting unit 5 performs an operation of adjusting the feedback current including the common mode current that returns from the power conversion unit 4 to the power supply unit 1 via the electric motor 2.
  • the power supply unit 1 is a DC power supply that outputs a DC voltage, but the present invention is not limited to this.
  • the power supply unit 1 may be a power supply device that generates a DC voltage based on the output of an AC power supply that outputs an AC voltage. In this case, the AC power supply is not included in the components of the power supply unit 1.
  • the DC power supply or the AC power supply can be used properly by changing the configuration of the power supply unit 110.
  • the electric motor 2 is a connection switching motor in which the connection state of each phase winding can be switched to either star connection or delta connection. Since the electric motor 2 is a connection switching electric motor, the neutral point is separated as shown in the figure. With this configuration, a total of six lead wires 50u_1,50u_2,50v_1,50v_2,50w_1,50w_2 are drawn from the motor 2. Leader wires 50u_1 and 50u_2 are U-phase AC wirings. Leader wires 50v_1, 50v_2 are V-phase AC wirings. The leader wires 50w_1 and 50w_2 are W-phase AC wirings.
  • the electric motor 2 and the power supply unit 110 are electrically connected by lead wires 50u_1,50u_2,50v_1,50v_2,50w_1,50w_2.
  • the operating power to the electric motor 2 is supplied from the power supply unit 110 through the three lead wires 50u_1, 50v_1, 50w_1 under the control of the control unit 200.
  • the electric motor 2 includes a U-phase winding 21, a V-phase winding 22, and a W-phase winding 23. Further, the electric motor 2 has terminals 2u_1, 2, u_2, 2v_1, 2, v_2, 2w_1, 2w_2.
  • one end of the U-phase winding 21 is connected to the terminal 2u_1, and the other end of the U-phase winding 21 is connected to the terminal 2u_1.
  • One end of the V-phase winding 22 is connected to the terminal 2v_1, and the other end of the V-phase winding 22 is connected to the terminal 2v_1.
  • One end of the W-phase winding 23 is connected to the terminal 2w_1, and the other end of the W-phase winding 23 is connected to the terminal 2w_1.
  • connection switching unit 3 has a function of switching the connection state of each phase winding of the motor 2 from star connection to delta connection, or from delta connection to star connection.
  • the connection switching unit 3 includes a switching device 31, a switching device 32, and a switching device 33, as shown in FIGS. 3 and 4. Further, the connection switching unit 3 has terminals 3u, 3v, 3w, 3u_1,3v_1,3w_1,3u_2,3v_2,3w_2,3N and connection wirings 3u_3,3v_3,3w_3.
  • An example of the switch 31, the switch 32, and the switch 33 is a c-contact type switch having contacts d, e, and f, as shown in FIGS. 3 and 4.
  • the contact f is connected to the contact d when the power is on, and is connected to the contact e when the power is off.
  • the contact f is connected to the contact e when energized and is connected to the contact d when not energized.
  • each switch is described as a c-contact type switch, but the present invention is not limited to these examples.
  • Each switch may be a switch that can be opened and closed in both directions.
  • each switch may be configured by a contact type switch, a b contact type switch, or a combination of both switches.
  • each switch may be a semiconductor switch.
  • the switch 31, the switch 32, and the switch 33 are driven by the drive signals S11, S21, and S31 output from the connection switching signal transmission unit 210.
  • the drive signals S11, S21, and S31 are generated based on the control signals S1, S2, and S3 output from the control unit 200.
  • each switch has a small conduction loss when it is turned on, and a mechanical switch such as a relay or a contactor can be used.
  • a switching element formed of a wide bandgap semiconductor may be used instead of the mechanical switch.
  • the contact d of the switch 31 is connected to the connection wiring 3v_3.
  • the connection wiring 3v_3 is a connection wiring for electrically connecting the terminal 3v and the terminal 3v_1 inside the connection switching unit 3.
  • the terminal 3v_1 is a terminal connected to the lead wire 50v_1.
  • the contact d of the switch 32 is connected to the connection wiring 3w_3.
  • the connection wiring 3w_3 is a connection wiring for electrically connecting the terminal 3w and the terminal 3w_1 inside the connection switching unit 3.
  • the terminal 3w_1 is a terminal connected to the lead wire 50w_1.
  • the contact d of the switch 33 is connected to the connection wiring 3u_3.
  • the connection wiring 3u_3 is a connection wiring for electrically connecting the terminal 3u and the terminal 3u_1 inside the connection switching unit 3.
  • the terminal 3u_1 is a terminal connected to the lead wire 50u_1.
  • Each contact e of the switches 31, 32, 33 is connected to the terminal 3N.
  • the contact f of the switch 31 is connected to the terminal 3u_2.
  • the terminal 3u_2 is a terminal connected to the lead wire 50u_2. Therefore, the terminal 3u_2 and the terminal 2u_2 of the electric motor 2 are electrically connected by the lead wire 50u_2.
  • the contact f of the switch 32 is connected to the terminal 3v_2.
  • the terminal 3v_2 is a terminal connected to the lead wire 50v_2. Therefore, the terminal 3v_2 and the terminal 2v_2 of the electric motor 2 are electrically connected by the lead wire 50v_2.
  • the contact f of the switch 33 is connected to the terminal 3w_2.
  • the terminal 3w_2 is a terminal connected to the lead wire 50w_2. Therefore, the terminal 3w_2 and the terminal 2w_2 of the electric motor 2 are electrically connected by the lead wire 50w_2.
  • the contact f of each switch is connected to the contact e. Therefore, the connection state of FIG. 3 in the motor 2 is a star connection. Further, in FIG. 4, the contact f of each switch is connected to the contact d. Therefore, the connection state of FIG. 4 in the motor 2 is a delta connection.
  • the power conversion unit 4 has a leg 40u in which the upper arm element 41 and the lower arm element 42 are connected in series, and the upper arm element 43 and the lower arm element 44 are connected in series. It includes a leg 40v and a leg 40w in which an upper arm element 45 and a lower arm element 46 are connected in series.
  • the legs 40u, 40v and 40w are connected in parallel to each other.
  • the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 exemplify a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor: MOSFET). Not limited. Insulated gate bipolar transistors (Insulated Gate Bipolar Transistors: IGBTs) may be used instead of the MOSFETs.
  • the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 are driven by the drive signals Sup1, Sun1, Sbp1, Svn1, Swp1, Swn1 output from the drive signal transmission unit 220.
  • the drive signals Sup1, Sun1, Subp1, Svn1, Swp1, Swn1 are generated based on the control signals Sup, Sun, Spp, Swn, Swp, Swn output from the control unit 200.
  • the upper arm element 41 includes a transistor 40a and a diode 40b connected to the transistor 40a in antiparallel.
  • the other upper arm elements 43, 45 and lower arm elements 42, 44, 46 have the same configuration.
  • Opposite parallel means that the anode of the diode is connected to the source of the MOSFET and the cathode of the diode is connected to the collector of the MOSFET.
  • FIG. 2 has a configuration including three legs in which the upper arm element and the lower arm element are connected in series, but the configuration is not limited to this configuration. The number of legs may be four or more.
  • the transistor 40a of the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 is a MOSFET
  • at least one of the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 is , Silicon carbide, gallium nitride, gallium oxide or diamond may be formed of a wide bandgap semiconductor. If a MOSFET formed of a wide bandgap semiconductor is used, the effects of withstand voltage and heat resistance can be enjoyed.
  • the power conversion unit 4 has terminals 4a, 4b, 4u, 4v, 4w.
  • the connection point 48u between the upper arm element 41 and the lower arm element 42 is connected to the terminal 4u.
  • the connection point 48v between the upper arm element 43 and the lower arm element 44 is connected to the terminal 4v.
  • the connection point 48w between the upper arm element 45 and the lower arm element 46 is connected to the terminal 4w.
  • the terminal 4u and the terminal 3u of the connection switching unit 3 are electrically connected by the connection line 30u.
  • the terminal 4v and the terminal 3v of the connection switching unit 3 are electrically connected by the connection line 30v.
  • the terminal 4w and the terminal 3w of the connection switching unit 3 are electrically connected by the connection line 30w.
  • connection points of the upper arm elements 41, 43, 45 are connected to the terminal 4a.
  • a power line 50a on the high potential side is connected to the terminal 4a.
  • the connection points of the lower arm elements 42, 44, 46 are connected to the terminal 4b.
  • a power line 50b on the low potential side is connected to the terminal 4b.
  • the power supply line 50a on the high potential side may be referred to as a "first power supply line”
  • the power supply line 50b on the low potential side may be referred to as a "second power supply line”.
  • the feedback current adjusting unit 5 includes bypass capacitors 51 and 52, open / close switches 53 and 55, and coupling capacitors 54, 56, 57, 58 and 59.
  • the bypass capacitors 51 and 52 operate as so-called Y capacitors.
  • the feedback current adjusting unit 5 has terminals 5u, 5v, 5w, 5N.
  • the terminal 5u and the terminal 3u of the connection switching unit 3 are electrically connected by the connection line 32u.
  • the terminal 5v and the terminal 3v of the connection switching unit 3 are electrically connected by the connection line 32v.
  • the terminal 5w and the terminal 3w of the connection switching unit 3 are electrically connected by the connection line 32w.
  • the terminal 5N and the terminal 3N of the connection switching unit 3 are electrically connected by the connection line 32N.
  • the open / close switches 53 and 55 are driven by the selection signals Sa1 and Sb1 output from the feedback selection signal transmission unit 230.
  • the selection signals Sa1 and Sb1 are generated based on the control signals Sa and Sb output from the control unit 200.
  • Power lines 50a and 50b are routed inside the feedback current adjusting unit 5.
  • One end of the power supply line 50a is connected to the terminal 4a of the power conversion unit 4 (FIG. 2), and the other end of the power supply line 50a is connected to the terminal 1a of the power supply unit 1 (FIG. 1).
  • One end of the power supply line 50b is connected to the terminal 4b of the power conversion unit 4 (FIG. 2), and the other end of the power supply line 50b is connected to the terminal 1b of the power supply unit 1 (FIG. 1).
  • the terminal 1a is a high potential side terminal and the terminal 1b is a low potential side terminal.
  • the bypass capacitors 51 and 52 are connected in series and arranged between the power supply lines 50a and 50b.
  • the bypass capacitor 51 is connected to the power supply line 50a, and the bypass capacitor 52 is connected to the power supply line 50b.
  • One end of the coupling capacitor 54 is connected to the midpoint 50c, which is the connection point of the bypass capacitors 51 and 52, via the open / close switch 53.
  • the other end of the coupling capacitor 54 is connected to the terminal 5N.
  • One end of the coupling capacitor 56 is connected to the midpoint 50c via the open / close switch 55.
  • the other end of the coupling capacitor 56 is connected to a connection point 50d between one ends of the coupling capacitors 57, 58, 59.
  • the other end of the coupling capacitor 57 is connected to the terminal 5u
  • the other end of the coupling capacitor 58 is connected to the terminal 5v
  • the other end of the coupling capacitor 59 is connected to the terminal 5w.
  • a DC voltage output from the power supply unit 1 is applied to the power conversion unit 4 via the feedback current adjustment unit 5.
  • the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 in the power conversion unit 4 apply an AC voltage to the electric motor 2 while the upper and lower arm elements operate in a complementary manner.
  • the electric motor 2 is driven by applying a rotating magnetic field by the applied AC voltage.
  • connection state of the motor 2 is a star connection
  • the contact f of each switch is connected to the contact e.
  • the lead wire 50u_2, 50v_2, 50w_2 drawn out from the electric motor 2 is electrically connected to the terminal 3N of the connection switching unit 3 via each switch.
  • the upper and lower arm elements of the power conversion unit 4 often perform complementary switching operations.
  • the potential of the power supply line 50a on the high potential side and the potential of the power supply line 50b on the low potential side are alternately generated at the connection points 48u, 48v, 48w in the power conversion unit 4.
  • the potentials of the connection points 48u, 48v, and 48w fluctuate greatly.
  • the neutral point potential of the electric motor 2 also momentarily fluctuates greatly.
  • the motor 2 Since the motor 2 is usually surrounded by a frame or the like, it has a stray capacitance between the motor winding and the frame. For example, in the case of an electric motor used in a compressor of an air conditioner, there is a stray capacitance between the electric motor winding and the compressor shell. When the neutral point potential of the motor 2 fluctuates momentarily through this kind of stray capacitance, a common mode current flows to the outside of the motor 2. This common mode current may pass through the ground to the power supply unit 1 and be conducted as common mode noise, which may adversely affect other devices.
  • the power supply unit excluding the power supply unit 1 applies the common mode current that flows due to the momentary fluctuation of the neutral point potential of the electric motor 2.
  • a current path that is, a circuit loop, is formed between the 110 and the electric motor 2.
  • the open / close switch 53 is controlled to be turned on.
  • the above-mentioned common mode current can be reduced to the terminal 3N, connection line 32N, terminal 5N, coupling capacitor 54, open / close switch 53, midpoint 50c, bypass capacitor 51 or bypass of the connection switching unit 3. It returns to the power conversion unit 4 via the capacitor 52. That is, the common mode current is fed back via the coupling capacitor 54 and the open / close switch 53 in the feedback current adjusting unit 5. Therefore, the common mode current from the electric motor 2 to the power supply unit 1 via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit 1 side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
  • the state of the open / close switch 55 which is the other open / close switch, may be either on or off.
  • the common mode current is affected by the presence of the coupling capacitors 56, 57, 58, 59, it is desirable that the open / close switch 55 is controlled to be off.
  • connection state of the motor 2 is a delta connection
  • the contact f of each switch is connected to the contact d.
  • the lead wire 50u_2 drawn out from the electric motor 2 is electrically connected to the terminal 5v of the feedback current adjusting unit 5 via the switch 31, the connecting wiring 3v_3, the terminal 3v, and the connecting wire 32v.
  • the lead wire 50v_2 drawn out from the electric motor 2 is electrically connected to the terminal 5w of the feedback current adjusting unit 5 via the switch 32, the connecting wiring 3w_3, the terminal 3w, and the connecting wire 32w.
  • the lead wire 50w_2 drawn out from the electric motor 2 is electrically connected to the terminal 5u of the feedback current adjusting unit 5 via the switch 33, the connection wiring 3u_3, the terminal 3u, and the connection line 32u.
  • the above-mentioned common mode current is generated even when the connection state of the motor 2 is delta connection. Therefore, as in the case of star connection, control is performed to form a circuit loop for circulating a part of the common mode current toward the power supply unit 1 between the power supply unit 110 excluding the power supply unit 1 and the motor 2. Do.
  • the open / close switch 55 is controlled to be turned on.
  • the above-mentioned common mode current can be reduced to the terminal 3u, the connection line 32u, the terminal 5u, the coupling capacitor 57, the coupling capacitor 56, the open / close switch 55, and the midpoint 50c of the connection switching unit 3. It returns to the power conversion unit 4 via the bypass capacitor 51 or the bypass capacitor 52. Further, the common mode current passes through the terminal 3v, the connection line 32v, the terminal 5v, the coupling capacitor 58, the coupling capacitor 56, the open / close switch 55, the middle point 50c, the bypass capacitor 51 or the bypass capacitor 52 of the connection switching unit 3.
  • the common mode current passes through the terminal 3w, the connection line 32w, the terminal 5w, the coupling capacitor 59, the coupling capacitor 56, the open / close switch 55, the midpoint 50c, the bypass capacitor 51 or the bypass capacitor 52 of the connection switching unit 3.
  • the common mode current is fed back via the coupling capacitors 56, 57, 58, 59 and the open / close switch 55 in the feedback current adjusting unit 5. Therefore, the common mode current from the electric motor 2 to the power supply unit 1 via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit 1 side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
  • the terminals 5u, 5v, 5w, the coupling capacitors 56, 57, 58, 59 and the open / close switch 55 feed back the feedback current including the common mode current when the connection state of the motor 2 is delta connection. It operates as a first pull-in unit that draws into the current adjusting unit 5.
  • the terminal 5N, the coupling capacitor 54, and the open / close switch 53 draw a feedback current including a common mode current into the feedback current adjusting unit 5 when the connection state of the motor 2 is a star connection. Operates as a pull-in part of.
  • the winding resistance and inductance in the case of star connection are equivalently three times the winding resistance and inductance in the case of delta connection. Therefore, the impedance of the delta connection is lower than that of the star connection, and the common mode current easily flows. As a result, the common mode noise may be larger in the delta connection than in the star connection. Therefore, in the first embodiment, when the connection state of the motor 2 is a delta connection, the path of the common mode current circulating in the device via the feedback current adjusting unit 5 is tripled as in the case of the star connection. There is. As a result, in the case of delta connection, the amount of common mode current circulating in the device can be increased, and the amount of common mode current flowing out to the power supply unit 1 side can be made equal between the delta connection and the star connection. ..
  • the state of the open / close switch 53 which is the other open / close switch, may be either on or off.
  • the open / close switch 53 is controlled to be off.
  • the capacitance of at least one of the coupling capacitors 54, 56, 57, 58, 59 can be adjusted. Something is desirable.
  • the coupling capacitors 54 or the coupling capacitors 56, 57, 58, 59 are arranged in both paths so that the connection state of the motor 2 can correspond to both the case of the delta connection and the case of the star connection.
  • the configuration is not limited to that shown in FIG. As mentioned above, the influence of the common mode current is considered to be greater in the delta connection. Therefore, from the configuration of FIG. 1, the open / close switch 53 and the coupling capacitor 54 may be omitted, and a configuration that can handle only the case of delta connection may be used.
  • the open / close switch 55 is omitted, and a circuit loop for returning the common mode current is always formed through the coupling capacitors 56, 57, 58, 59.
  • the feedback current adjusting unit 5 may be configured.
  • the open / close switch 53 and the coupling capacitor 54 may be mounted or not mounted according to the motor type or the device configuration.
  • a capacitor is illustrated as an example of an element for adjusting the common mode current, but the present invention is not limited to this. Any element may be used as long as it can adjust the common mode current.
  • each of the coupling capacitors 54, 56, 57, 58, 59 may be replaced with a resistance element.
  • the power supply unit 110 at least two components of the connection switching unit 3, the power conversion unit 4, and the feedback current adjusting unit 5 may be mounted on the same substrate.
  • the connection switching unit 3 since the electric neutral point is inside the electric motor, the distance between the electric neutral point and the power conversion unit 4 becomes long. Therefore, the adjustment of the common mode current is easily affected by the AC wiring.
  • the electrical neutral point is inside the connection switching unit 3. Therefore, if the connection switching unit 3 and the power conversion unit 4 are mounted on the same substrate, the distance between the electrical neutral point of the connection switching unit 3 and the power conversion unit 4 can be shortened. As a result, the influence of the AC wiring can be reduced when adjusting the common mode current. Further, since the distance between the electrical neutral point of the connection switching unit 3 and the power conversion unit 4 can be shortened, the stray capacitance existing between the wiring path and the ground can be reduced. Therefore, the magnitude of the common mode current itself that can flow from the electric motor 2 via the ground via the stray capacitance can be reduced. Thereby, the generation of common mode noise can be reduced.
  • connection switching unit 3 and the feedback current adjusting unit 5 are mounted on the same substrate, the distance between the electrical neutral point of the wiring switching unit 3 and the feedback current adjusting unit 5 can be shortened. As a result, the influence of the AC wiring can be reduced when adjusting the common mode current.
  • connection switching unit 3 the power conversion unit 4, and the feedback current adjusting unit 5 are mounted on the same board, the above-mentioned terminals can be provided on the board. With this configuration, the connection between the various lead wires drawn from the electric motor 2 and the various power supply lines drawn from the power supply unit 1 becomes easier than in the case of a general electric motor.
  • FIG. 6 is a diagram showing a configuration of a modified example of the electric motor drive device 100A according to the first embodiment.
  • the power supply unit 110 is replaced with the power supply unit 110A in the configuration of the electric motor drive device 100 shown in FIG.
  • the feedback current adjusting unit 5 is replaced with the feedback current adjusting unit 5A.
  • a terminal 5N_2 to be further grounded is provided in the feedback current adjusting unit 5A.
  • the other configurations are the same as or equivalent to the configurations shown in FIG. 1, and the same or equivalent components are designated by the same reference numerals, and redundant description will be omitted.
  • FIG. 7 is a diagram showing a configuration example of the feedback current adjusting unit 5A shown in FIG.
  • the midpoint 50c is electrically connected to the terminal 5N_2.
  • the potential at the midpoint 50c is set to the same potential as the ground (GND). That is, the potential at the midpoint 50c is the ground potential.
  • the other configurations are the same as or equivalent to the configuration shown in FIG. 5, and the same or equivalent components are designated by the same reference numerals, and redundant description will be omitted.
  • the potential at the midpoint 50c is set as the ground potential via the terminal 5N_2 provided in the feedback current adjusting unit 5A, but the configuration is not limited to this.
  • the equivalent terminal and the midpoint 50c may be electrically connected.
  • FIG. 8 is a diagram showing a configuration example when the AC / DC converter is included in the power supply unit 1 shown in FIGS. 1 and 6.
  • the power supply unit 1 includes an AC / DC converter 8 connected to the AC power supply 10.
  • the AC / DC converter 8 includes four switching elements 11, 12, 13, and 14 that are bridge-connected.
  • the AC voltage output from the AC power supply 10 is applied between the connection points of the switching elements 11 and 12 and the connection points of the switching elements 13 and 14 via the reactor 15.
  • the switching elements 11, 12, 13, and 14 are switched and controlled by the control unit 200, generate a boosted voltage, and output the boosted voltage from the terminals 1a and 1b.
  • the power supply unit 1 includes the AC / DC converter 8 having the configuration shown in FIG. 8, a common mode current is generated due to the switching operation of the switching elements 11, 12, 13, and 14. A part of this common mode current may be suppressed by the feedback current adjusting units 5 and 5A in the first embodiment. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current when the power supply unit 1 has the configuration shown in FIG.
  • FIG. 9 is a diagram showing a configuration example different from that of FIG. 8 when the power supply unit 1A includes an AC / DC converter.
  • the AC / DC converter 8A in which the switching element 11 is replaced with the diode 11a and the switching element 13 is replaced with the diode 13a is shown.
  • a common mode current is generated by the switching operation of the switching elements 12 and 14. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current even when the power supply unit 1A includes the AC / DC converter 8A shown in FIG.
  • FIG. 10 is a diagram showing a configuration example different from that of FIGS. 8 and 9 when the power supply unit 1B includes an AC / DC converter.
  • the power supply unit 1B shown in FIG. 10 in the configuration of the power supply unit 1 shown in FIG. 8, the AC / DC converter 8B in which the switching element 13 is replaced with the diode 13b and the switching element 14 is replaced with the diode 14b is shown. ing. Also in the configuration shown in FIG. 10, a common mode current is generated by the switching operation of the switching elements 11 and 12. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current even when the power supply unit 1B includes the AC / DC converter 8B shown in FIG.
  • the electric motor drive device for driving the electric motor configured so that the connection state of each phase winding can be switched to either star connection or delta connection is from the power conversion unit. It is provided with a feedback current adjusting unit that adjusts a feedback current including a common mode current that returns to the power supply unit via an electric motor. According to this feedback current adjusting unit, the common mode current from the electric motor to the power supply unit via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
  • the feedback current adjusting unit includes a first lead-in unit that draws in the feedback current when the connection state of the motor is delta connection via the connection switching unit.
  • the feedback current adjusting unit includes a second lead-in portion that draws in the feedback current when the connection state of the motor is star connection through the connection switching unit.
  • the feedback current adjusting unit is configured to be able to select whether or not to draw in the feedback current. Thereby, it is possible to decide whether to mount or not to mount the motor according to the motor type or the device configuration.
  • the power conversion unit the connection switching unit, and the feedback current adjusting unit, which are the components of the electric motor drive device, may be mounted on the same substrate.
  • the influence of the AC wiring can be reduced when adjusting the common mode current.
  • the connection between the various lead wires drawn from the electric motor and the various power supply lines drawn from the power supply unit becomes easier than in the case of a general electric motor.
  • connection switching unit and the power conversion unit are mounted on the same board, the stray capacitance existing between the wiring path and the ground can be reduced. Thereby, the generation of common mode noise can be reduced.
  • FIG. 11 is a block diagram showing an example of a hardware configuration that realizes the function of the control unit 200 according to the first embodiment.
  • FIG. 12 is a block diagram showing another example of the hardware configuration that realizes the function of the control unit 200 according to the first embodiment.
  • the processor 300 that performs the calculation
  • the memory 302 that stores the program read by the processor 300
  • the input / output of the signal are input / output. It can be configured to include the interface 304 to be performed.
  • the processor 300 may be an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor).
  • the memory 302 includes a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Program ROM), and an EPROM (registered trademark) (Electrically EPROM). Examples thereof include magnetic disks, flexible disks, optical disks, compact disks, mini disks, and DVDs (Digital entirely Disc).
  • the memory 302 stores a program that executes the function of the control unit 200 according to the first embodiment.
  • the processor 300 sends and receives necessary information via the interface 304, the processor 300 executes a program stored in the memory 302, and the processor 300 refers to a table stored in the memory 302 to perform the above-described processing. It can be carried out.
  • the calculation result by the processor 300 can be stored in the memory 302.
  • the processing circuit 305 shown in FIG. 12 can also be used.
  • the processing circuit 305 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.
  • the information input to the processing circuit 305 and the information output from the processing circuit 305 can be obtained via the interface 304. Even in the configuration using the processing circuit 305, some processing in the control unit 200 may be performed by the processor 300 having the configuration shown in FIG.
  • FIG. 13 is a diagram showing a configuration example of the air conditioner 240 according to the second embodiment.
  • the air conditioner 240 according to the second embodiment includes the electric motor driving device 100 described in the first embodiment.
  • the compressor 251 incorporating the electric motor 2 in the first embodiment, the four-way valve 259, the outdoor heat exchanger 252, the expansion valve 261 and the indoor heat exchanger 257 are connected via a refrigerant pipe 262. It is equipped with a refrigeration cycle installed in the air conditioner to form a separate air conditioner.
  • the components having the same or equivalent functions as those of the first embodiment are designated by the same reference numerals as those of the first embodiment.
  • a refrigeration cycle is configured in which the refrigerant circulates between the compressor 251 and the outdoor heat exchanger 252 and between the compressor 251 and the indoor heat exchanger 257 to perform heating and cooling.
  • the configuration shown in FIG. 13 can be applied not only to an air conditioner but also to a refrigerating cycle apparatus including a refrigerating cycle such as a refrigerator and a freezer.
  • 1,1A, 1B Power supply unit 1a, 1b, 2u_1,2u_2,2v_1,2v_2,2w_1,2w_2,3N, 3u, 3v, 3w, 3u_1,3v_1,3w_1,3u_2,3v_2,3w_2,4a, 4b, 4u, 4v, 4w, 5N, 5u, 5v, 5w terminal, 2 electric motor, 3 connection switching part, 3u_3, 3v_3, 3w_3 connection wiring, 4 power conversion part, 5,5A feedback current adjustment part, 8,8A, 8B AC / DC conversion Instrument, 10 AC power supply, 11, 12, 13, 14 switching element, 11a, 13a, 13b, 14b, 40b diode, 21 U-phase winding, 22 V-phase winding, 23 W-phase winding, 30u, 30v, 30w , 32N, 32u, 32v, 32w connection line, 31, 32, 33 switch, 40a transistor, 40u, 40v, 40w leg, 41, 43, 45 upper

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Abstract

An electric motor driving device (100) is provided with: a connection switching unit (3) that switches, to either star connection or delta connection, respective phases of winding wires of an electric motor (2) including a total of six leader lines separated at the neutral points and led out; a power source (1) that generates power to be supplied to the electric motor (2); a power conversion unit (4) that converts a voltage of DC power supplied from the power source (1) into AC power of a voltage of a given AC frequency; and a feedback current adjustment unit (5) that adjusts a feedback current including a common-mode current fed back to the power source (1) from the power conversion unit (4) via the electric motor (2).

Description

電動機駆動装置、空気調和機及び冷凍サイクル装置Electric motor drive, air conditioner and refrigeration cycle device
　本発明は、電動機を駆動する電動機駆動装置、並びに電動機駆動装置を備えた空気調和機及び冷凍サイクル装置に関する。 The present invention relates to an electric motor drive device for driving an electric motor, and an air conditioner and a refrigeration cycle device provided with the electric motor drive device.
　下記特許文献１には、周波数可変且つ電圧可変のインバータを用いて電動機の回転数を変えると共に、負荷に応じて固定子巻線の結線状態を、スター結線とデルタ結線との間で切り替えることで、電力消費を少なくし、効率を高めた電動機駆動装置が記載されている。 In Patent Document 1 below, the rotation speed of the motor is changed by using an inverter having a variable frequency and a variable voltage, and the connection state of the stator winding is switched between the star connection and the delta connection according to the load. , Electric motor drive devices with reduced power consumption and increased efficiency are described.
　このような結線切り替えが行われる結線切替電動機を空気調和機の圧縮機に用いる場合、年間消費電力に対する寄与度が高い中間条件（「低負荷条件」とも呼ばれる）ではスター結線で駆動し、高負荷である定格条件ではデルタ結線で駆動することが考えられる。このようにすることで、中間条件における効率を向上させ、定格条件での高出力化も可能となる。 When a connection switching motor that performs such connection switching is used as a compressor for an air conditioner, it is driven by star connection under intermediate conditions (also called "low load conditions") that contribute to annual power consumption, resulting in a high load. Under the rated conditions of, it is conceivable to drive with a delta connection. By doing so, the efficiency under the intermediate conditions can be improved, and the output can be increased under the rated conditions.
　結線切替電動機の場合、スター結線においては、インバータ出力電流と巻線電流とは大きさが同じになるが、デルタ結線においては、インバータ出力電流は巻線電流の√３倍になる。従って、結線切替電動機において、巻線インピーダンスは、結線仕様により異なり、電動機駆動において考慮する必要がある。 In the case of a connection switching motor, the inverter output current and winding current have the same magnitude in star connection, but in delta connection, the inverter output current is √3 times the winding current. Therefore, in the connection switching motor, the winding impedance differs depending on the connection specifications and needs to be taken into consideration in driving the motor.
　また、インバータのスイッチング動作時においては、電動機と大地との間の浮遊静電容量を介して微弱電流が大地に漏れる。微弱電流は、更に大地を経由して電源に向かうことがある。環境によって大きさも異なるが、大地を経由する微弱電流は、コモンモードノイズとして装置の外部に流出していくことが知られている。 Also, during the switching operation of the inverter, a weak current leaks to the ground via the floating capacitance between the electric motor and the ground. The weak current may go further to the power source via the ground. Although the magnitude varies depending on the environment, it is known that a weak current passing through the ground flows out to the outside of the device as common mode noise.
国際公開第２０１８／０７８８３７号International Publication No. 2018/078837
　コモンモードノイズの外部流出を抑制するために、各種ノイズフィルタが用いられている。しかしながら、結線切替電動機の場合、前述したように、結線仕様に応じて巻線インピーダンスが異なるため、双方の結線仕様に効果的なフィルタを構成するのが難しいという課題がある。 Various noise filters are used to suppress the outflow of common mode noise. However, in the case of a connection switching motor, as described above, since the winding impedance differs depending on the connection specifications, there is a problem that it is difficult to configure an effective filter for both connection specifications.
　本発明は、上記に鑑みてなされたものであって、結線切替電動機をスター結線及びデルタ結線の何れの結線仕様で駆動する場合においても、比較的簡易且つ安価な手段でコモンモードノイズの流出を抑制することができる電動機駆動装置を得ることを目的とする。 The present invention has been made in view of the above, and when the connection switching motor is driven by any connection specification of star connection or delta connection, the outflow of common mode noise can be prevented by a relatively simple and inexpensive means. The purpose is to obtain an electric motor drive device that can be suppressed.
　上述した課題を解決し、目的を達成するために、本発明は、中性点が切り離されて引き出された合計６本の引き出し線を有する電動機を駆動する電動機駆動装置である。電動機駆動装置は、電動機の各相巻線をスター結線又はデルタ結線の何れかに切り替える結線切替部と、電動機に供給する電力を生成する電源部と、を備える。また、電動機駆動装置は、電源部から供給される直流電力の電圧を任意の交流周波数の電圧の交流電力に変換する電力変換部と、電力変換部から電動機を介して電源部に帰還するコモンモード電流を含む帰還電流を調整する帰還電流調整部と、を備える。 In order to solve the above-mentioned problems and achieve the object, the present invention is an electric motor drive device for driving an electric motor having a total of 6 lead wires drawn out with the neutral point separated. The electric motor drive device includes a connection switching unit that switches each phase winding of the electric motor to either star connection or delta connection, and a power supply unit that generates electric power to be supplied to the electric motor. Further, the electric motor drive device has a power conversion unit that converts the voltage of DC power supplied from the power supply unit into AC power of a voltage of an arbitrary AC frequency, and a common mode in which the power conversion unit returns to the power supply unit via the electric motor. A feedback current adjusting unit for adjusting a feedback current including a current is provided.
　本発明に係る電動機駆動装置によれば、結線切替電動機をスター結線及びデルタ結線の何れの結線仕様で駆動する場合においても、比較的簡易且つ安価な手段でコモンモードノイズの流出を抑制することができるという効果を奏する。 According to the electric motor drive device according to the present invention, it is possible to suppress the outflow of common mode noise by a relatively simple and inexpensive means regardless of whether the connection switching electric motor is driven by the connection specifications of star connection and delta connection. It has the effect of being able to do it.
実施の形態１に係る電動機駆動装置の構成を示す図The figure which shows the structure of the electric motor drive device which concerns on Embodiment 1. 実施の形態１における電力変換部の一例としての直流交流変換器の構成を示す図The figure which shows the structure of the DC AC converter as an example of the power conversion part in Embodiment 1. FIG. 実施の形態１における結線切替部の構成例及び第１の結線状態を示す図The figure which shows the configuration example of the connection switching part and the 1st connection state in Embodiment 1. 実施の形態１における結線切替部の構成例及び第２の結線状態を示す図The figure which shows the structural example of the connection switching part and the 2nd connection state in Embodiment 1. 実施の形態１における帰還電流調整部の構成例を示す図The figure which shows the structural example of the feedback current adjustment part in Embodiment 1. 実施の形態１に係る電動機駆動装置の変形例の構成を示す図The figure which shows the structure of the modification of the electric motor drive device which concerns on Embodiment 1. 図６に示す帰還電流調整部の構成例を示す図The figure which shows the structural example of the feedback current adjustment part shown in FIG. 図１及び図６に示す電源部に交流直流変換器が含まれる場合の構成例を示す図The figure which shows the configuration example when the AC / DC converter is included in the power-source part shown in FIGS. 1 and 6. 電源部に交流直流変換器が含まれる場合の図８とは異なる構成例を示す図The figure which shows the configuration example different from FIG. 8 when the AC / DC converter is included in the power-source part. 電源部に交流直流変換器が含まれる場合の図８及び図９とは異なる構成例を示す図The figure which shows the configuration example which is different from FIG. 8 and FIG. 実施の形態１における制御部の機能を実現するハードウェア構成の一例を示すブロック図A block diagram showing an example of a hardware configuration that realizes the function of the control unit according to the first embodiment. 実施の形態１における制御部の機能を実現するハードウェア構成の他の例を示すブロック図A block diagram showing another example of a hardware configuration that realizes the function of the control unit according to the first embodiment. 実施の形態２に係る空気調和機の構成例を示す図The figure which shows the structural example of the air conditioner which concerns on Embodiment 2.
　以下に添付図面を参照し、本発明の実施の形態に係る電動機駆動装置、空気調和機及び冷凍サイクル装置について説明する。なお、以下に示す実施の形態により本発明が限定されるものではない。 The electric motor drive device, the air conditioner, and the refrigeration cycle device according to the embodiment of the present invention will be described below with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.
実施の形態１．
　図１は、実施の形態１に係る電動機駆動装置１００の構成を示す図である。図２は、実施の形態１における電力変換部４の一例としての直流交流変換器の構成を示す図である。図３は、実施の形態１における結線切替部３の構成例及び第１の結線状態を示す図である。図４は、実施の形態１における結線切替部３の構成例及び第２の結線状態を示す図である。図５は、実施の形態１における帰還電流調整部５の構成例を示す図である。 Embodiment 1.
FIG. 1 is a diagram showing a configuration of an electric motor drive device 100 according to a first embodiment. FIG. 2 is a diagram showing a configuration of a DC / AC converter as an example of the power conversion unit 4 in the first embodiment. FIG. 3 is a diagram showing a configuration example of the connection switching unit 3 and the first connection state in the first embodiment. FIG. 4 is a diagram showing a configuration example of the connection switching unit 3 and the second connection state in the first embodiment. FIG. 5 is a diagram showing a configuration example of the feedback current adjusting unit 5 according to the first embodiment.
　実施の形態１に係る電動機駆動装置１００は、電力供給部１１０と、制御部２００と、結線切替信号伝達部２１０と、駆動信号伝達部２２０と、帰還選択信号伝達部２３０とを備える。電力供給部１１０は、電源部１と、帰還電流調整部５と、電力変換部４と、結線切替部３とを備える。 The electric motor drive device 100 according to the first embodiment includes a power supply unit 110, a control unit 200, a connection switching signal transmission unit 210, a drive signal transmission unit 220, and a feedback selection signal transmission unit 230. The power supply unit 110 includes a power supply unit 1, a feedback current adjusting unit 5, a power conversion unit 4, and a connection switching unit 3.
　結線切替部３は、電動機２の各相巻線をスター結線又はデルタ結線の何れかに切り替える。電源部１は、電動機２に供給する電力を生成する。電力変換部４は、電源部１から供給される直流電力の電圧を任意の交流周波数の電圧の交流電力に変換し、変換した電力を電動機２に供給する。帰還電流調整部５は、電力変換部４から電動機２を介して電源部１に帰還するコモンモード電流を含む帰還電流を調整する動作を実施する。 The connection switching unit 3 switches each phase winding of the motor 2 to either star connection or delta connection. The power supply unit 1 generates electric power to be supplied to the electric motor 2. The power conversion unit 4 converts the voltage of the DC power supplied from the power supply unit 1 into AC power having a voltage of an arbitrary AC frequency, and supplies the converted power to the electric motor 2. The feedback current adjusting unit 5 performs an operation of adjusting the feedback current including the common mode current that returns from the power conversion unit 4 to the power supply unit 1 via the electric motor 2.
　電源部１の一例は、直流電圧を出力する直流電源であるが、これに限定されない。電源部１は、交流電圧を出力する交流電源の出力に基づいて直流電圧を生成する電源装置であってもよい。なお、この場合、交流電源は電源部１の構成要素には含まれない。直流電源又は交流電源の使い分けは、電力供給部１１０の構成を変更することで実施可能である。 An example of the power supply unit 1 is a DC power supply that outputs a DC voltage, but the present invention is not limited to this. The power supply unit 1 may be a power supply device that generates a DC voltage based on the output of an AC power supply that outputs an AC voltage. In this case, the AC power supply is not included in the components of the power supply unit 1. The DC power supply or the AC power supply can be used properly by changing the configuration of the power supply unit 110.
　電動機２は、各相巻線の結線状態がスター結線又はデルタ結線の何れかに切り替え可能に構成される結線切替電動機である。電動機２は、結線切替電動機であるため、図示のように中性点が切り離されている。この構成により、電動機２からは合計６本の引き出し線５０ｕ_１，５０ｕ_２，５０ｖ_１，５０ｖ_２，５０ｗ_１，５０ｗ_２が引き出されている。引き出し線５０ｕ_１，５０ｕ_２は、Ｕ相の交流配線である。引き出し線５０ｖ_１，５０ｖ_２は、Ｖ相の交流配線である。引き出し線５０ｗ_１，５０ｗ_２は、Ｗ相の交流配線である。電動機２と電力供給部１１０とは、引き出し線５０ｕ_１，５０ｕ_２，５０ｖ_１，５０ｖ_２，５０ｗ_１，５０ｗ_２によって電気的に接続される。電動機２への動作電力は、制御部２００の制御により、３本の引き出し線５０ｕ_１，５０ｖ_１，５０ｗ_１を通じて電力供給部１１０から供給される。 The electric motor 2 is a connection switching motor in which the connection state of each phase winding can be switched to either star connection or delta connection. Since the electric motor 2 is a connection switching electric motor, the neutral point is separated as shown in the figure. With this configuration, a total of six lead wires 50u_1,50u_2,50v_1,50v_2,50w_1,50w_2 are drawn from the motor 2. Leader wires 50u_1 and 50u_2 are U-phase AC wirings. Leader wires 50v_1, 50v_2 are V-phase AC wirings. The leader wires 50w_1 and 50w_2 are W-phase AC wirings. The electric motor 2 and the power supply unit 110 are electrically connected by lead wires 50u_1,50u_2,50v_1,50v_2,50w_1,50w_2. The operating power to the electric motor 2 is supplied from the power supply unit 110 through the three lead wires 50u_1, 50v_1, 50w_1 under the control of the control unit 200.
　電動機２は、Ｕ相巻線２１と、Ｖ相巻線２２と、Ｗ相巻線２３とを備える。また、電動機２は、端子２ｕ_１，２ｕ_２，２ｖ_１，２ｖ_２，２ｗ_１，２ｗ_２を有する。電動機２において、Ｕ相巻線２１の一端は端子２ｕ_１に接続され、Ｕ相巻線２１の他端は端子２ｕ_２に接続される。Ｖ相巻線２２の一端は端子２ｖ_１に接続され、Ｖ相巻線２２の他端は端子２ｖ_２に接続される。Ｗ相巻線２３の一端は端子２ｗ_１に接続され、Ｗ相巻線２３の他端は端子２ｗ_２に接続される。 The electric motor 2 includes a U-phase winding 21, a V-phase winding 22, and a W-phase winding 23. Further, the electric motor 2 has terminals 2u_1, 2, u_2, 2v_1, 2, v_2, 2w_1, 2w_2. In the electric motor 2, one end of the U-phase winding 21 is connected to the terminal 2u_1, and the other end of the U-phase winding 21 is connected to the terminal 2u_1. One end of the V-phase winding 22 is connected to the terminal 2v_1, and the other end of the V-phase winding 22 is connected to the terminal 2v_1. One end of the W-phase winding 23 is connected to the terminal 2w_1, and the other end of the W-phase winding 23 is connected to the terminal 2w_1.
　結線切替部３は、電動機２の各相巻線の結線状態を、スター結線からデルタ結線に切り替え、又はデルタ結線からスター結線に切り替える機能を有する。この機能を実現するため、結線切替部３は、図３及び図４に示すように、切替器３１と、切替器３２と、切替器３３とを有する。また、結線切替部３は、端子３ｕ，３ｖ，３ｗ，３ｕ_１，３ｖ_１，３ｗ_１，３ｕ_２，３ｖ_２，３ｗ_２，３Ｎと、接続配線３ｕ_３，３ｖ_３，３ｗ_３とを有する。 The connection switching unit 3 has a function of switching the connection state of each phase winding of the motor 2 from star connection to delta connection, or from delta connection to star connection. In order to realize this function, the connection switching unit 3 includes a switching device 31, a switching device 32, and a switching device 33, as shown in FIGS. 3 and 4. Further, the connection switching unit 3 has terminals 3u, 3v, 3w, 3u_1,3v_1,3w_1,3u_2,3v_2,3w_2,3N and connection wirings 3u_3,3v_3,3w_3.
　切替器３１、切替器３２及び切替器３３の一例は、図３及び図４に示すように、接点ｄ，ｅ，ｆを有するｃ接点型の切替器である。接点ｆは、通電時に接点ｄと接続され、非通電時に接点ｅと接続される。或いは、接点ｆは、通電時に接点ｅと接続され、非通電時に接点ｄと接続される。なお、図３及び図４では、各切替器は、ｃ接点型の切替器として記載しているが、これらの例に限定されない。各切替器は、それぞれが双方向に開閉することのできる切替器であればよい。例えば、各切替器は、ａ接点型の切替器又はｂ接点型の切替器又は両者の切替器が組み合わされて構成されていてもよい。また、各切替器は、半導体スイッチであってもよい。 An example of the switch 31, the switch 32, and the switch 33 is a c-contact type switch having contacts d, e, and f, as shown in FIGS. 3 and 4. The contact f is connected to the contact d when the power is on, and is connected to the contact e when the power is off. Alternatively, the contact f is connected to the contact e when energized and is connected to the contact d when not energized. In addition, in FIG. 3 and FIG. 4, each switch is described as a c-contact type switch, but the present invention is not limited to these examples. Each switch may be a switch that can be opened and closed in both directions. For example, each switch may be configured by a contact type switch, a b contact type switch, or a combination of both switches. Further, each switch may be a semiconductor switch.
　切替器３１、切替器３２及び切替器３３は、結線切替信号伝達部２１０から出力される駆動信号Ｓ１１，Ｓ２１，Ｓ３１によって駆動される。駆動信号Ｓ１１，Ｓ２１，Ｓ３１は、制御部２００から出力される制御信号Ｓ１，Ｓ２，Ｓ３に基づいて生成される。 The switch 31, the switch 32, and the switch 33 are driven by the drive signals S11, S21, and S31 output from the connection switching signal transmission unit 210. The drive signals S11, S21, and S31 are generated based on the control signals S1, S2, and S3 output from the control unit 200.
　各切替器は、オン時の導通損失が小さいものが好適であり、リレー又はコンタクタといった機械スイッチを用いることができる。また、機械スイッチに代えて、ワイドバンドギャップ半導体により形成されたスイッチング素子を使用してもよい。ワイドバンドギャップ半導体により形成されたスイッチング素子とすることで、オン抵抗が小さく、低損失で素子発熱が小さいという効果を享受することができる。 It is preferable that each switch has a small conduction loss when it is turned on, and a mechanical switch such as a relay or a contactor can be used. Further, instead of the mechanical switch, a switching element formed of a wide bandgap semiconductor may be used. By using a switching element formed of a wide bandgap semiconductor, it is possible to enjoy the effects of low on-resistance, low loss, and low element heat generation.
　切替器３１の接点ｄは、接続配線３ｖ_３に接続される。接続配線３ｖ_３は、結線切替部３の内部において、端子３ｖと端子３ｖ_１とを電気的に接続するための接続配線である。端子３ｖ_１は、引き出し線５０ｖ_１に接続される端子である。切替器３２の接点ｄは、接続配線３ｗ_３に接続される。接続配線３ｗ_３は、結線切替部３の内部において、端子３ｗと端子３ｗ_１とを電気的に接続するための接続配線である。端子３ｗ_１は、引き出し線５０ｗ_１に接続される端子である。切替器３３の接点ｄは、接続配線３ｕ_３に接続される。接続配線３ｕ_３は、結線切替部３の内部において、端子３ｕと端子３ｕ_１とを電気的に接続するための接続配線である。端子３ｕ_１は、引き出し線５０ｕ_１に接続される端子である。 The contact d of the switch 31 is connected to the connection wiring 3v_3. The connection wiring 3v_3 is a connection wiring for electrically connecting the terminal 3v and the terminal 3v_1 inside the connection switching unit 3. The terminal 3v_1 is a terminal connected to the lead wire 50v_1. The contact d of the switch 32 is connected to the connection wiring 3w_3. The connection wiring 3w_3 is a connection wiring for electrically connecting the terminal 3w and the terminal 3w_1 inside the connection switching unit 3. The terminal 3w_1 is a terminal connected to the lead wire 50w_1. The contact d of the switch 33 is connected to the connection wiring 3u_3. The connection wiring 3u_3 is a connection wiring for electrically connecting the terminal 3u and the terminal 3u_1 inside the connection switching unit 3. The terminal 3u_1 is a terminal connected to the lead wire 50u_1.
　切替器３１，３２，３３の各接点ｅは、端子３Ｎに接続される。切替器３１の接点ｆは、端子３ｕ_２に接続される。端子３ｕ_２は、引き出し線５０ｕ_２に接続される端子である。従って、端子３ｕ_２と、電動機２の端子２ｕ_２とは、引き出し線５０ｕ_２によって電気的に接続される。切替器３２の接点ｆは、端子３ｖ_２に接続される。端子３ｖ_２は、引き出し線５０ｖ_２に接続される端子である。従って、端子３ｖ_２と、電動機２の端子２ｖ_２とは、引き出し線５０ｖ_２によって電気的に接続される。切替器３３の接点ｆは、端子３ｗ_２に接続される。端子３ｗ_２は、引き出し線５０ｗ_２に接続される端子である。従って、端子３ｗ_２と、電動機２の端子２ｗ_２とは、引き出し線５０ｗ_２によって電気的に接続される。 Each contact e of the switches 31, 32, 33 is connected to the terminal 3N. The contact f of the switch 31 is connected to the terminal 3u_2. The terminal 3u_2 is a terminal connected to the lead wire 50u_2. Therefore, the terminal 3u_2 and the terminal 2u_2 of the electric motor 2 are electrically connected by the lead wire 50u_2. The contact f of the switch 32 is connected to the terminal 3v_2. The terminal 3v_2 is a terminal connected to the lead wire 50v_2. Therefore, the terminal 3v_2 and the terminal 2v_2 of the electric motor 2 are electrically connected by the lead wire 50v_2. The contact f of the switch 33 is connected to the terminal 3w_2. The terminal 3w_2 is a terminal connected to the lead wire 50w_2. Therefore, the terminal 3w_2 and the terminal 2w_2 of the electric motor 2 are electrically connected by the lead wire 50w_2.
　図３では、各切替器の接点ｆは、接点ｅに接続されている。このため、電動機２における図３の結線状態は、スター結線である。また、図４では、各切替器の接点ｆは、接点ｄに接続されている。このため、電動機２における図４の結線状態は、デルタ結線である。 In FIG. 3, the contact f of each switch is connected to the contact e. Therefore, the connection state of FIG. 3 in the motor 2 is a star connection. Further, in FIG. 4, the contact f of each switch is connected to the contact d. Therefore, the connection state of FIG. 4 in the motor 2 is a delta connection.
　電力変換部４は、図２にされるように、上アーム素子４１と下アーム素子４２とが直列に接続されたレグ４０ｕと、上アーム素子４３と下アーム素子４４とが直列に接続されたレグ４０ｖと、上アーム素子４５と下アーム素子４６とが直列に接続されたレグ４０ｗと、を備える。レグ４０ｕ、レグ４０ｖ及びレグ４０ｗは、互いに並列に接続されている。なお、図２では、上アーム素子４１，４３，４５及び下アーム素子４２，４４，４６が金属酸化物半導体電界効果トランジスタ（Ｍｅｔａｌ　Ｏｘｉｄｅ　Ｓｅｍｉｃｏｎｄｕｃｔｏｒ　Ｆｉｅｌｄ　Ｅｆｆｅｃｔ　Ｔｒａｎｓｉｓｔｏｒ：ＭＯＳＦＥＴ）を例示しているが、ＭＯＳＦＥＴに限定されない。ＭＯＳＦＥＴに代えて、絶縁ゲートバイポーラトランジスタ（Ｉｎｓｕｌａｔｅｄ　Ｇａｔｅ　Ｂｉｐｏｌａｒ　Ｔｒａｎｓｉｓｔｏｒ：ＩＧＢＴ）を用いてもよい。 As shown in FIG. 2, the power conversion unit 4 has a leg 40u in which the upper arm element 41 and the lower arm element 42 are connected in series, and the upper arm element 43 and the lower arm element 44 are connected in series. It includes a leg 40v and a leg 40w in which an upper arm element 45 and a lower arm element 46 are connected in series. The legs 40u, 40v and 40w are connected in parallel to each other. In FIG. 2, the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 exemplify a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor: MOSFET). Not limited. Insulated gate bipolar transistors (Insulated Gate Bipolar Transistors: IGBTs) may be used instead of the MOSFETs.
　上アーム素子４１，４３，４５及び下アーム素子４２，４４，４６は、駆動信号伝達部２２０から出力される駆動信号Ｓｕｐ１，Ｓｕｎ１，Ｓｖｐ１，Ｓｖｎ１，Ｓｗｐ１，Ｓｗｎ１によって駆動される。駆動信号Ｓｕｐ１，Ｓｕｎ１，Ｓｖｐ１，Ｓｖｎ１，Ｓｗｐ１，Ｓｗｎ１は、制御部２００から出力される制御信号Ｓｕｐ，Ｓｕｎ，Ｓｖｐ，Ｓｖｎ，Ｓｗｐ，Ｓｗｎに基づいて生成される。 The upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 are driven by the drive signals Sup1, Sun1, Sbp1, Svn1, Swp1, Swn1 output from the drive signal transmission unit 220. The drive signals Sup1, Sun1, Subp1, Svn1, Swp1, Swn1 are generated based on the control signals Sup, Sun, Spp, Swn, Swp, Swn output from the control unit 200.
　上アーム素子４１は、トランジスタ４０ａと、トランジスタ４０ａに逆並列に接続されるダイオード４０ｂとを含む。他の上アーム素子４３，４５、及び下アーム素子４２，４４，４６についても同様の構成である。逆並列とは、ＭＯＳＦＥＴのソースにダイオードのアノードが接続され、ＭＯＳＦＥＴのコレクタにダイオードのカソードが接続されることを意味する。なお、図２は、上アーム素子と下アーム素子とが直列に接続されるレグを３つ備える構成であるが、この構成に限定されない。レグの数は４つ以上でもよい。 The upper arm element 41 includes a transistor 40a and a diode 40b connected to the transistor 40a in antiparallel. The other upper arm elements 43, 45 and lower arm elements 42, 44, 46 have the same configuration. Opposite parallel means that the anode of the diode is connected to the source of the MOSFET and the cathode of the diode is connected to the collector of the MOSFET. Note that FIG. 2 has a configuration including three legs in which the upper arm element and the lower arm element are connected in series, but the configuration is not limited to this configuration. The number of legs may be four or more.
　上アーム素子４１，４３，４５及び下アーム素子４２，４４，４６のトランジスタ４０ａがＭＯＳＦＥＴである場合、上アーム素子４１，４３，４５及び下アーム素子４２，４４，４６のうちの少なくとも１つは、炭化珪素、窒化ガリウム、酸化ガリウム又はダイヤモンドといったワイドバンドギャップ半導体により形成されていてもよい。ワイドバンドギャップ半導体により形成されたＭＯＳＦＥＴを用いれば、耐電圧性及び耐熱性の効果を享受することができる。 When the transistor 40a of the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 is a MOSFET, at least one of the upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 is , Silicon carbide, gallium nitride, gallium oxide or diamond may be formed of a wide bandgap semiconductor. If a MOSFET formed of a wide bandgap semiconductor is used, the effects of withstand voltage and heat resistance can be enjoyed.
　また、電力変換部４は、端子４ａ，４ｂ，４ｕ，４ｖ，４ｗを有する。上アーム素子４１と下アーム素子４２との接続点４８ｕは、端子４ｕに接続される。上アーム素子４３と下アーム素子４４との接続点４８ｖは、端子４ｖに接続される。上アーム素子４５と下アーム素子４６との接続点４８ｗは、端子４ｗに接続される。端子４ｕと、結線切替部３の端子３ｕとは、接続線３０ｕによって電気的に接続される。端子４ｖと、結線切替部３の端子３ｖとは、接続線３０ｖによって電気的に接続される。端子４ｗと、結線切替部３の端子３ｗとは、接続線３０ｗによって電気的に接続される。 Further, the power conversion unit 4 has terminals 4a, 4b, 4u, 4v, 4w. The connection point 48u between the upper arm element 41 and the lower arm element 42 is connected to the terminal 4u. The connection point 48v between the upper arm element 43 and the lower arm element 44 is connected to the terminal 4v. The connection point 48w between the upper arm element 45 and the lower arm element 46 is connected to the terminal 4w. The terminal 4u and the terminal 3u of the connection switching unit 3 are electrically connected by the connection line 30u. The terminal 4v and the terminal 3v of the connection switching unit 3 are electrically connected by the connection line 30v. The terminal 4w and the terminal 3w of the connection switching unit 3 are electrically connected by the connection line 30w.
　上アーム素子４１，４３，４５の接続点は、端子４ａに接続される。端子４ａには、高電位側の電源線５０ａが接続される。下アーム素子４２，４４，４６の接続点は、端子４ｂに接続される。端子４ｂには低電位側の電源線５０ｂが接続される。なお、以下において、高電位側の電源線５０ａを「第１電源線」と呼び、低電位側の電源線５０ｂを「第２電源線」と呼ぶ場合がある。 The connection points of the upper arm elements 41, 43, 45 are connected to the terminal 4a. A power line 50a on the high potential side is connected to the terminal 4a. The connection points of the lower arm elements 42, 44, 46 are connected to the terminal 4b. A power line 50b on the low potential side is connected to the terminal 4b. In the following, the power supply line 50a on the high potential side may be referred to as a "first power supply line", and the power supply line 50b on the low potential side may be referred to as a "second power supply line".
　帰還電流調整部５は、図５に示されるように、バイパスコンデンサ５１，５２と、開閉スイッチ５３，５５と、カップリングコンデンサ５４，５６，５７，５８，５９とを備える。バイパスコンデンサ５１，５２は、いわゆるＹコンデンサとして動作する。また、帰還電流調整部５は、端子５ｕ，５ｖ，５ｗ，５Ｎを有する。端子５ｕと、結線切替部３の端子３ｕとは、接続線３２ｕによって電気的に接続される。端子５ｖと、結線切替部３の端子３ｖとは、接続線３２ｖによって電気的に接続される。端子５ｗと、結線切替部３の端子３ｗとは、接続線３２ｗによって電気的に接続される。端子５Ｎと、結線切替部３の端子３Ｎとは、接続線３２Ｎによって電気的に接続される。 As shown in FIG. 5, the feedback current adjusting unit 5 includes bypass capacitors 51 and 52, open / close switches 53 and 55, and coupling capacitors 54, 56, 57, 58 and 59. The bypass capacitors 51 and 52 operate as so-called Y capacitors. Further, the feedback current adjusting unit 5 has terminals 5u, 5v, 5w, 5N. The terminal 5u and the terminal 3u of the connection switching unit 3 are electrically connected by the connection line 32u. The terminal 5v and the terminal 3v of the connection switching unit 3 are electrically connected by the connection line 32v. The terminal 5w and the terminal 3w of the connection switching unit 3 are electrically connected by the connection line 32w. The terminal 5N and the terminal 3N of the connection switching unit 3 are electrically connected by the connection line 32N.
　開閉スイッチ５３，５５は、帰還選択信号伝達部２３０から出力される選択信号Ｓａ１，Ｓｂ１によって駆動される。選択信号Ｓａ１，Ｓｂ１は、制御部２００から出力される制御信号Ｓａ，Ｓｂに基づいて生成される。 The open / close switches 53 and 55 are driven by the selection signals Sa1 and Sb1 output from the feedback selection signal transmission unit 230. The selection signals Sa1 and Sb1 are generated based on the control signals Sa and Sb output from the control unit 200.
　帰還電流調整部５の内部には、電源線５０ａ，５０ｂが引き通されている。電源線５０ａの一端は電力変換部４の端子４ａに接続され（図２）、電源線５０ａの他端は電源部１の端子１ａに接続される（図１）。電源線５０ｂの一端は電力変換部４の端子４ｂに接続され（図２）、電源線５０ｂの他端は電源部１の端子１ｂに接続される（図１）。電源部１において、端子１ａは高電位側端子であり、端子１ｂは低電位側端子である。 Power lines 50a and 50b are routed inside the feedback current adjusting unit 5. One end of the power supply line 50a is connected to the terminal 4a of the power conversion unit 4 (FIG. 2), and the other end of the power supply line 50a is connected to the terminal 1a of the power supply unit 1 (FIG. 1). One end of the power supply line 50b is connected to the terminal 4b of the power conversion unit 4 (FIG. 2), and the other end of the power supply line 50b is connected to the terminal 1b of the power supply unit 1 (FIG. 1). In the power supply unit 1, the terminal 1a is a high potential side terminal and the terminal 1b is a low potential side terminal.
　図５に戻り、バイパスコンデンサ５１，５２は、直列に接続されて電源線５０ａ，５０ｂ間に配される。バイパスコンデンサ５１は電源線５０ａに接続され、バイパスコンデンサ５２は電源線５０ｂに接続される。カップリングコンデンサ５４の一端は、開閉スイッチ５３を介してバイパスコンデンサ５１，５２の接続点である中点５０ｃに接続される。カップリングコンデンサ５４の他端は、端子５Ｎに接続される。カップリングコンデンサ５６の一端は、開閉スイッチ５５を介して中点５０ｃに接続される。カップリングコンデンサ５６の他端は、カップリングコンデンサ５７，５８，５９の各一端同士の接続点５０ｄに接続される。カップリングコンデンサ５７の他端は端子５ｕに接続され、カップリングコンデンサ５８の他端は端子５ｖに接続され、カップリングコンデンサ５９の他端は端子５ｗに接続される。 Returning to FIG. 5, the bypass capacitors 51 and 52 are connected in series and arranged between the power supply lines 50a and 50b. The bypass capacitor 51 is connected to the power supply line 50a, and the bypass capacitor 52 is connected to the power supply line 50b. One end of the coupling capacitor 54 is connected to the midpoint 50c, which is the connection point of the bypass capacitors 51 and 52, via the open / close switch 53. The other end of the coupling capacitor 54 is connected to the terminal 5N. One end of the coupling capacitor 56 is connected to the midpoint 50c via the open / close switch 55. The other end of the coupling capacitor 56 is connected to a connection point 50d between one ends of the coupling capacitors 57, 58, 59. The other end of the coupling capacitor 57 is connected to the terminal 5u, the other end of the coupling capacitor 58 is connected to the terminal 5v, and the other end of the coupling capacitor 59 is connected to the terminal 5w.
　次に、実施の形態１に係る電動機駆動装置１００における要部の動作について説明する。 Next, the operation of the main part of the electric motor drive device 100 according to the first embodiment will be described.
　電力変換部４には、帰還電流調整部５を介して電源部１から出力される直流電圧が印加される。電力変換部４における上アーム素子４１，４３，４５、及び下アーム素子４２，４４，４６は、それぞれ上下アーム素子が相補動作しながら、電動機２に交流電圧を印加する。電動機２は、印加された交流電圧によって回転磁界が与えられて駆動される。 A DC voltage output from the power supply unit 1 is applied to the power conversion unit 4 via the feedback current adjustment unit 5. The upper arm elements 41, 43, 45 and the lower arm elements 42, 44, 46 in the power conversion unit 4 apply an AC voltage to the electric motor 2 while the upper and lower arm elements operate in a complementary manner. The electric motor 2 is driven by applying a rotating magnetic field by the applied AC voltage.
　電動機２の結線状態がスター結線である場合、各切替器の接点ｆは接点ｅに接続されている。この場合、電動機２から引き出された引き出し線５０ｕ_２，５０ｖ_２，５０ｗ_２は、各切替器を介して結線切替部３の端子３Ｎに電気的に接続される。 When the connection state of the motor 2 is a star connection, the contact f of each switch is connected to the contact e. In this case, the lead wire 50u_2, 50v_2, 50w_2 drawn out from the electric motor 2 is electrically connected to the terminal 3N of the connection switching unit 3 via each switch.
　近年の応用製品では、電力変換部４の上下アーム素子が相補的にスイッチング動作することが多くなっている。この動作の場合、電力変換部４における接続点４８ｕ，４８ｖ，４８ｗには、高電位側の電源線５０ａによる電位と、低電位側の電源線５０ｂによる電位とが交互に発生する。これにより接続点４８ｕ，４８ｖ，４８ｗの電位は大きく変動する。このような相補的なスイッチング動作が行われている過渡状態においては、電動機２の中性点電位も、瞬間的に大きく変動している状態になる。 In recent applied products, the upper and lower arm elements of the power conversion unit 4 often perform complementary switching operations. In the case of this operation, the potential of the power supply line 50a on the high potential side and the potential of the power supply line 50b on the low potential side are alternately generated at the connection points 48u, 48v, 48w in the power conversion unit 4. As a result, the potentials of the connection points 48u, 48v, and 48w fluctuate greatly. In the transient state in which such a complementary switching operation is performed, the neutral point potential of the electric motor 2 also momentarily fluctuates greatly.
　電動機２は、通常フレーム等で囲われているため、電動機巻線とフレームとの間に浮遊容量を有することになる。例えば空気調和機の圧縮機に用いられる電動機の場合、電動機巻線と圧縮機シェルとの間に浮遊容量を有する。電動機２の中性点電位がこの種の浮遊容量を介して瞬間的に変動した場合、電動機２の外部にコモンモード電流が流れることとなる。このコモンモード電流が大地を経由して電源部１に向かい、コモンモードノイズとして伝導し、他の機器に悪影響を及ぼす場合がある。 Since the motor 2 is usually surrounded by a frame or the like, it has a stray capacitance between the motor winding and the frame. For example, in the case of an electric motor used in a compressor of an air conditioner, there is a stray capacitance between the electric motor winding and the compressor shell. When the neutral point potential of the motor 2 fluctuates momentarily through this kind of stray capacitance, a common mode current flows to the outside of the motor 2. This common mode current may pass through the ground to the power supply unit 1 and be conducted as common mode noise, which may adversely affect other devices.
　そこで、実施の形態１では、電源部１に向かうコモンモード電流を調整するため、電動機２の中性点電位の瞬間的変動に起因して流れるコモンモード電流を、電源部１を除く電力供給部１１０と電動機２との間で還流させる電流経路、即ち回路ループを形成する。 Therefore, in the first embodiment, in order to adjust the common mode current toward the power supply unit 1, the power supply unit excluding the power supply unit 1 applies the common mode current that flows due to the momentary fluctuation of the neutral point potential of the electric motor 2. A current path, that is, a circuit loop, is formed between the 110 and the electric motor 2.
　回路ループを形成するための構成要素は、前述した通りである。具体的な制御として、電動機２の結線状態がスター結線である場合、開閉スイッチ５３をオンに制御する。開閉スイッチ５３をオンにすることにより、前述したコモンモード電流は、結線切替部３の端子３Ｎ、接続線３２Ｎ、端子５Ｎ、カップリングコンデンサ５４、開閉スイッチ５３、中点５０ｃ、バイパスコンデンサ５１又はバイパスコンデンサ５２を経由して電力変換部４に戻る。即ち、帰還電流調整部５内のカップリングコンデンサ５４及び開閉スイッチ５３を介してコモンモード電流が帰還する。従って、電動機２から大地を経由して電源部１に向かうコモンモード電流を小さくすることができる。これにより、コモンモード電流の電源部１側への流出を抑制することができ、他の機器に悪影響を及ぼすコモンモードノイズを抑制することができる。 The components for forming the circuit loop are as described above. As a specific control, when the connection state of the motor 2 is a star connection, the open / close switch 53 is controlled to be turned on. By turning on the open / close switch 53, the above-mentioned common mode current can be reduced to the terminal 3N, connection line 32N, terminal 5N, coupling capacitor 54, open / close switch 53, midpoint 50c, bypass capacitor 51 or bypass of the connection switching unit 3. It returns to the power conversion unit 4 via the capacitor 52. That is, the common mode current is fed back via the coupling capacitor 54 and the open / close switch 53 in the feedback current adjusting unit 5. Therefore, the common mode current from the electric motor 2 to the power supply unit 1 via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit 1 side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
　なお、上記の制御を行う際、他方の開閉スイッチである開閉スイッチ５５の状態は、オン又はオフの何れの状態でもよい。但し、カップリングコンデンサ５６，５７，５８，５９の存在によって、コモンモード電流が影響を受ける場合には、開閉スイッチ５５はオフに制御されていることが望ましい。 When performing the above control, the state of the open / close switch 55, which is the other open / close switch, may be either on or off. However, when the common mode current is affected by the presence of the coupling capacitors 56, 57, 58, 59, it is desirable that the open / close switch 55 is controlled to be off.
　次に、電動機２の結線状態がデルタ結線である場合について説明する。電動機２の結線状態がデルタ結線である場合、各切替器の接点ｆは接点ｄに接続されている。この場合、電動機２から引き出された引き出し線５０ｕ_２は、切替器３１、接続配線３ｖ_３、端子３ｖ、接続線３２ｖを介して帰還電流調整部５の端子５ｖに電気的に接続される。以下同様に、電動機２から引き出された引き出し線５０ｖ_２は、切替器３２、接続配線３ｗ_３、端子３ｗ、接続線３２ｗを介して帰還電流調整部５の端子５ｗに電気的に接続される。電動機２から引き出された引き出し線５０ｗ_２は、切替器３３、接続配線３ｕ_３、端子３ｕ、接続線３２ｕを介して帰還電流調整部５の端子５ｕに電気的に接続される。 Next, a case where the connection state of the motor 2 is a delta connection will be described. When the connection state of the electric motor 2 is delta connection, the contact f of each switch is connected to the contact d. In this case, the lead wire 50u_2 drawn out from the electric motor 2 is electrically connected to the terminal 5v of the feedback current adjusting unit 5 via the switch 31, the connecting wiring 3v_3, the terminal 3v, and the connecting wire 32v. Similarly, the lead wire 50v_2 drawn out from the electric motor 2 is electrically connected to the terminal 5w of the feedback current adjusting unit 5 via the switch 32, the connecting wiring 3w_3, the terminal 3w, and the connecting wire 32w. The lead wire 50w_2 drawn out from the electric motor 2 is electrically connected to the terminal 5u of the feedback current adjusting unit 5 via the switch 33, the connection wiring 3u_3, the terminal 3u, and the connection line 32u.
　電動機２の結線状態がデルタ結線である場合においても、上述したコモンモード電流は発生する。そこで、スター結線のときと同様に、電源部１に向かうコモンモード電流の一部を、電源部１を除く電力供給部１１０と電動機２との間で還流させるための回路ループを形成する制御を行う。 The above-mentioned common mode current is generated even when the connection state of the motor 2 is delta connection. Therefore, as in the case of star connection, control is performed to form a circuit loop for circulating a part of the common mode current toward the power supply unit 1 between the power supply unit 110 excluding the power supply unit 1 and the motor 2. Do.
　回路ループを形成するための構成要素は、前述した通りである。具体的な制御として、開閉スイッチ５５をオンに制御する。開閉スイッチ５５をオンにすることにより、前述したコモンモード電流は、結線切替部３の端子３ｕ、接続線３２ｕ、端子５ｕ、カップリングコンデンサ５７、カップリングコンデンサ５６、開閉スイッチ５５、中点５０ｃ、バイパスコンデンサ５１又はバイパスコンデンサ５２を経由して電力変換部４に戻る。また、コモンモード電流は、結線切替部３の端子３ｖ、接続線３２ｖ、端子５ｖ、カップリングコンデンサ５８、カップリングコンデンサ５６、開閉スイッチ５５、中点５０ｃ、バイパスコンデンサ５１又はバイパスコンデンサ５２を経由して電力変換部４に戻る。更に、コモンモード電流は、結線切替部３の端子３ｗ、接続線３２ｗ、端子５ｗ、カップリングコンデンサ５９、カップリングコンデンサ５６、開閉スイッチ５５、中点５０ｃ、バイパスコンデンサ５１又はバイパスコンデンサ５２を経由して電力変換部４に戻る。即ち、帰還電流調整部５内のカップリングコンデンサ５６，５７，５８，５９及び開閉スイッチ５５を介してコモンモード電流が帰還する。従って、電動機２から大地を経由して電源部１に向かうコモンモード電流を小さくすることができる。これにより、コモンモード電流の電源部１側への流出を抑制することができ、他の機器に悪影響を及ぼすコモンモードノイズを抑制することができる。 The components for forming the circuit loop are as described above. As a specific control, the open / close switch 55 is controlled to be turned on. By turning on the open / close switch 55, the above-mentioned common mode current can be reduced to the terminal 3u, the connection line 32u, the terminal 5u, the coupling capacitor 57, the coupling capacitor 56, the open / close switch 55, and the midpoint 50c of the connection switching unit 3. It returns to the power conversion unit 4 via the bypass capacitor 51 or the bypass capacitor 52. Further, the common mode current passes through the terminal 3v, the connection line 32v, the terminal 5v, the coupling capacitor 58, the coupling capacitor 56, the open / close switch 55, the middle point 50c, the bypass capacitor 51 or the bypass capacitor 52 of the connection switching unit 3. Return to the power conversion unit 4. Further, the common mode current passes through the terminal 3w, the connection line 32w, the terminal 5w, the coupling capacitor 59, the coupling capacitor 56, the open / close switch 55, the midpoint 50c, the bypass capacitor 51 or the bypass capacitor 52 of the connection switching unit 3. Return to the power conversion unit 4. That is, the common mode current is fed back via the coupling capacitors 56, 57, 58, 59 and the open / close switch 55 in the feedback current adjusting unit 5. Therefore, the common mode current from the electric motor 2 to the power supply unit 1 via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit 1 side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
　上記の構成において、端子５ｕ，５ｖ，５ｗ、カップリングコンデンサ５６，５７，５８，５９及び開閉スイッチ５５は、電動機２の結線状態がデルタ結線であるときに、コモンモード電流を含む帰還電流を帰還電流調整部５に引き込む第１の引き込み部として動作する。 In the above configuration, the terminals 5u, 5v, 5w, the coupling capacitors 56, 57, 58, 59 and the open / close switch 55 feed back the feedback current including the common mode current when the connection state of the motor 2 is delta connection. It operates as a first pull-in unit that draws into the current adjusting unit 5.
　また、上記の構成において、端子５Ｎ、カップリングコンデンサ５４及び開閉スイッチ５３は、電動機２の結線状態がスター結線であるときに、コモンモード電流を含む帰還電流を帰還電流調整部５に引き込む第２の引き込み部として動作する。 Further, in the above configuration, the terminal 5N, the coupling capacitor 54, and the open / close switch 53 draw a feedback current including a common mode current into the feedback current adjusting unit 5 when the connection state of the motor 2 is a star connection. Operates as a pull-in part of.
　なお、結線切替電動機である電動機２において、スター結線の場合の巻線抵抗及びインダクタンスは、等価的にデルタ結線の場合の巻線抵抗及びインダクタンスの３倍となる。従って、デルタ結線の方がスター結線よりもインピーダンスが低く、コモンモード電流が流れ易くなる。これにより、スター結線よりもデルタ結線の方が、コモンモードノイズが大きくなることがある。このため、実施の形態１では、電動機２の結線状態がデルタ結線の場合には、帰還電流調整部５を介して装置内を循環させるコモンモード電流の経路をスター結線の場合の３倍にしている。これにより、デルタ結線の場合、装置内を循環させるコモンモード電流量を増やすことができ、コモンモード電流の電源部１側への流出量を、デルタ結線とスター結線とで同等にすることができる。 In the motor 2 which is a connection switching motor, the winding resistance and inductance in the case of star connection are equivalently three times the winding resistance and inductance in the case of delta connection. Therefore, the impedance of the delta connection is lower than that of the star connection, and the common mode current easily flows. As a result, the common mode noise may be larger in the delta connection than in the star connection. Therefore, in the first embodiment, when the connection state of the motor 2 is a delta connection, the path of the common mode current circulating in the device via the feedback current adjusting unit 5 is tripled as in the case of the star connection. There is. As a result, in the case of delta connection, the amount of common mode current circulating in the device can be increased, and the amount of common mode current flowing out to the power supply unit 1 side can be made equal between the delta connection and the star connection. ..
　また、上記の制御を行う際、他方の開閉スイッチである開閉スイッチ５３の状態は、オン又はオフの何れの状態でもよい。但し、カップリングコンデンサ５４の存在によって、コモンモード電流が影響を受ける場合には、開閉スイッチ５３はオフに制御されていることが望ましい。 Further, when performing the above control, the state of the open / close switch 53, which is the other open / close switch, may be either on or off. However, when the common mode current is affected by the presence of the coupling capacitor 54, it is desirable that the open / close switch 53 is controlled to be off.
　また、コモンモード電流の要因となる電動機２における浮遊容量は、電動機種別又は装置構成によって異なるため、カップリングコンデンサ５４，５６，５７，５８，５９のうちの少なくとも１つは、容量調整が可能であるものが望ましい。 Further, since the stray capacitance in the motor 2 which is a factor of the common mode current differs depending on the motor type or the device configuration, the capacitance of at least one of the coupling capacitors 54, 56, 57, 58, 59 can be adjusted. Something is desirable.
　また、図５では、電動機２の結線状態がデルタ結線の場合及びスター結線の場合の両方に対応できるように、両方の経路にカップリングコンデンサ５４又はカップリングコンデンサ５６，５７，５８，５９を配置する例を示しているが、図５の構成に限定されない。前述したように、コモンモード電流の影響はデルタ結線の方が大きいと考えられる。このため、図１の構成から、開閉スイッチ５３及びカップリングコンデンサ５４を省略し、デルタ結線の場合のみに対応できる構成としてもよい。 Further, in FIG. 5, the coupling capacitors 54 or the coupling capacitors 56, 57, 58, 59 are arranged in both paths so that the connection state of the motor 2 can correspond to both the case of the delta connection and the case of the star connection. However, the configuration is not limited to that shown in FIG. As mentioned above, the influence of the common mode current is considered to be greater in the delta connection. Therefore, from the configuration of FIG. 1, the open / close switch 53 and the coupling capacitor 54 may be omitted, and a configuration that can handle only the case of delta connection may be used.
　コモンモード電流の影響はデルタ結線の方が大きいと考えられるので、開閉スイッチ５５は省略し、コモンモード電流を還流させるための回路ループがカップリングコンデンサ５６，５７，５８，５９を通じて常時形成されるように、帰還電流調整部５が構成されていてもよい。この場合、開閉スイッチ５３及びカップリングコンデンサ５４については、電動機種別又は装置構成に対応させて、実装又は非実装を決定してもよい。 Since the influence of the common mode current is considered to be larger in the delta connection, the open / close switch 55 is omitted, and a circuit loop for returning the common mode current is always formed through the coupling capacitors 56, 57, 58, 59. As described above, the feedback current adjusting unit 5 may be configured. In this case, the open / close switch 53 and the coupling capacitor 54 may be mounted or not mounted according to the motor type or the device configuration.
　また、図５では、コモンモード電流を調整する素子例としてコンデンサを例示したが、これに限定されない。コモンモード電流を調整できる素子であれば、どのような素子を用いてもよい。一例として、カップリングコンデンサ５４，５６，５７，５８，５９のそれぞれを抵抗素子で置き替えてもよい。 Further, in FIG. 5, a capacitor is illustrated as an example of an element for adjusting the common mode current, but the present invention is not limited to this. Any element may be used as long as it can adjust the common mode current. As an example, each of the coupling capacitors 54, 56, 57, 58, 59 may be replaced with a resistance element.
　次に、電力供給部１１０を構成する際の着意事項について説明する。電力供給部１１０において、結線切替部３、電力変換部４及び帰還電流調整部５のうちの少なくとも２つの構成部は、同一基板上に搭載されていてもよい。通常の電動機は、電気的な中性点が電動機の内部にあるので、電気的な中性点と電力変換部４との間の距離が長くなる。このため、コモンモード電流の調整は、交流配線の影響を受け易くなる。 Next, we will explain the important points when configuring the power supply unit 110. In the power supply unit 110, at least two components of the connection switching unit 3, the power conversion unit 4, and the feedback current adjusting unit 5 may be mounted on the same substrate. In a normal electric motor, since the electric neutral point is inside the electric motor, the distance between the electric neutral point and the power conversion unit 4 becomes long. Therefore, the adjustment of the common mode current is easily affected by the AC wiring.
　一方、結線切替電動機である電動機２の場合、電気的な中性点は結線切替部３の内部にある。このため、結線切替部３と電力変換部４とを同一基板上に搭載すれば、結線切替部３の電気的な中性点と電力変換部４との距離を短くすることができる。これにより、コモンモード電流の調整に際し、交流配線の影響を低減することができる。また、結線切替部３の電気的な中性点と電力変換部４との距離を短くできるので、配線経路と大地との間に存在する浮遊容量を低減することができる。このため、浮遊容量を介して電動機２から大地を経由して流れ得るコモンモード電流自体の大きさを小さくできる。これにより、コモンモードノイズの発生を低減することができる。 On the other hand, in the case of the electric motor 2 which is a connection switching electric motor, the electrical neutral point is inside the connection switching unit 3. Therefore, if the connection switching unit 3 and the power conversion unit 4 are mounted on the same substrate, the distance between the electrical neutral point of the connection switching unit 3 and the power conversion unit 4 can be shortened. As a result, the influence of the AC wiring can be reduced when adjusting the common mode current. Further, since the distance between the electrical neutral point of the connection switching unit 3 and the power conversion unit 4 can be shortened, the stray capacitance existing between the wiring path and the ground can be reduced. Therefore, the magnitude of the common mode current itself that can flow from the electric motor 2 via the ground via the stray capacitance can be reduced. Thereby, the generation of common mode noise can be reduced.
　また、結線切替部３と帰還電流調整部５とを同一基板上に搭載すれば、結線切替部３の電気的な中性点と帰還電流調整部５との距離を短くすることができる。これにより、コモンモード電流の調整に際し、交流配線の影響を低減することができる。 Further, if the connection switching unit 3 and the feedback current adjusting unit 5 are mounted on the same substrate, the distance between the electrical neutral point of the wiring switching unit 3 and the feedback current adjusting unit 5 can be shortened. As a result, the influence of the AC wiring can be reduced when adjusting the common mode current.
　また、結線切替部３、電力変換部４及び帰還電流調整部５のうちの少なくとも２つを同一基板上に搭載すれば、当該基板上に上述した各端子を設けることができる。この構成により、電動機２から引き出された各種の引き出し線と、電源部１から引き出された各種の電源線との接続が、一般的な電動機の場合と比べて容易となる。 Further, if at least two of the connection switching unit 3, the power conversion unit 4, and the feedback current adjusting unit 5 are mounted on the same board, the above-mentioned terminals can be provided on the board. With this configuration, the connection between the various lead wires drawn from the electric motor 2 and the various power supply lines drawn from the power supply unit 1 becomes easier than in the case of a general electric motor.
　次に、変形例について説明する。図６は、実施の形態１に係る電動機駆動装置１００Ａの変形例の構成を示す図である。図６において、実施の形態１の変形例に係る電動機駆動装置１００Ａでは、図１に示す電動機駆動装置１００の構成において、電力供給部１１０が電力供給部１１０Ａに置き替えられている。また、電力供給部１１０Ａの内部では、帰還電流調整部５が帰還電流調整部５Ａに置き替えられている。帰還電流調整部５Ａでは、図１の帰還電流調整部５の構成において、更に接地される端子５Ｎ_２が設けられている。なお、その他の構成については、図１の構成と同一又は同等であり、同一又は同等の構成部には同一の符号を付して、重複する説明は省略する。 Next, a modified example will be described. FIG. 6 is a diagram showing a configuration of a modified example of the electric motor drive device 100A according to the first embodiment. In FIG. 6, in the electric motor drive device 100A according to the modified example of the first embodiment, the power supply unit 110 is replaced with the power supply unit 110A in the configuration of the electric motor drive device 100 shown in FIG. Further, inside the power supply unit 110A, the feedback current adjusting unit 5 is replaced with the feedback current adjusting unit 5A. In the feedback current adjusting unit 5A, in the configuration of the feedback current adjusting unit 5 of FIG. 1, a terminal 5N_2 to be further grounded is provided. The other configurations are the same as or equivalent to the configurations shown in FIG. 1, and the same or equivalent components are designated by the same reference numerals, and redundant description will be omitted.
　図７は、図６に示す帰還電流調整部５Ａの構成例を示す図である。図７において、帰還電流調整部５Ａでは、中点５０ｃが端子５Ｎ_２に電気的に接続されている。これにより、中点５０ｃの電位は、グラウンド（ＧＮＤ）と同電位とされている。即ち、中点５０ｃの電位は、グラウンド電位とされている。なお、その他の構成については、図５の構成と同一又は同等であり、同一又は同等の構成部には同一の符号を付して、重複する説明は省略する。 FIG. 7 is a diagram showing a configuration example of the feedback current adjusting unit 5A shown in FIG. In FIG. 7, in the feedback current adjusting unit 5A, the midpoint 50c is electrically connected to the terminal 5N_2. As a result, the potential at the midpoint 50c is set to the same potential as the ground (GND). That is, the potential at the midpoint 50c is the ground potential. The other configurations are the same as or equivalent to the configuration shown in FIG. 5, and the same or equivalent components are designated by the same reference numerals, and redundant description will be omitted.
　図５及び図７の構成において、接続点５０ｄには、電動機２の中性点の電位に相当する電位が表れる。このため、中点５０ｃを接地してグラウンド電位とすることで、電動機２の中性点の電位を安定化することができる。これにより、コモンモード電流の調整を確実に行うことができる。 In the configurations of FIGS. 5 and 7, a potential corresponding to the potential of the neutral point of the electric motor 2 appears at the connection point 50d. Therefore, the potential of the neutral point of the electric motor 2 can be stabilized by grounding the midpoint 50c to the ground potential. As a result, the common mode current can be reliably adjusted.
　なお、図７では、帰還電流調整部５Ａに設けられた端子５Ｎ_２を介して、中点５０ｃの電位をグラウンド電位としているが、この構成に限定されない。グラウンド電位と同等の端子が帰還電流調整部５Ａの内部にある場合には、当該同等の端子と中点５０ｃとが電気的に接続される構成であってもよい。 Note that in FIG. 7, the potential at the midpoint 50c is set as the ground potential via the terminal 5N_2 provided in the feedback current adjusting unit 5A, but the configuration is not limited to this. When a terminal equivalent to the ground potential is inside the feedback current adjusting unit 5A, the equivalent terminal and the midpoint 50c may be electrically connected.
　次に、電源部１の構成について説明する。図８は、図１及び図６に示す電源部１に交流直流変換器が含まれる場合の構成例を示す図である。図８において、電源部１は、交流電源１０に接続される交流直流変換器８を備える。交流直流変換器８は、ブリッジ接続される４つのスイッチング素子１１，１２，１３，１４を備える。交流電源１０から出力される交流電圧は、リアクトル１５を介して、スイッチング素子１１，１２の接続点とスイッチング素子１３，１４の接続点との間に印加される。スイッチング素子１１，１２，１３，１４は、制御部２００によってスイッチング制御され、昇圧した電圧を生成して端子１ａ，１ｂから出力する。 Next, the configuration of the power supply unit 1 will be described. FIG. 8 is a diagram showing a configuration example when the AC / DC converter is included in the power supply unit 1 shown in FIGS. 1 and 6. In FIG. 8, the power supply unit 1 includes an AC / DC converter 8 connected to the AC power supply 10. The AC / DC converter 8 includes four switching elements 11, 12, 13, and 14 that are bridge-connected. The AC voltage output from the AC power supply 10 is applied between the connection points of the switching elements 11 and 12 and the connection points of the switching elements 13 and 14 via the reactor 15. The switching elements 11, 12, 13, and 14 are switched and controlled by the control unit 200, generate a boosted voltage, and output the boosted voltage from the terminals 1a and 1b.
　電源部１が図８に示す構成の交流直流変換器８を含む場合、スイッチング素子１１，１２，１３，１４のスイッチング動作に起因するコモンモード電流が発生する。このコモンモード電流の一部は、実施の形態１における帰還電流調整部５，５Ａによって抑制できる場合がある。このため、実施の形態１における帰還電流調整部５，５Ａは、電源部１が図８に示す構成の場合において、コモンモード電流の調整に有効である。 When the power supply unit 1 includes the AC / DC converter 8 having the configuration shown in FIG. 8, a common mode current is generated due to the switching operation of the switching elements 11, 12, 13, and 14. A part of this common mode current may be suppressed by the feedback current adjusting units 5 and 5A in the first embodiment. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current when the power supply unit 1 has the configuration shown in FIG.
　図９は、電源部１Ａに交流直流変換器が含まれる場合の図８とは異なる構成例を示す図である。図９に示す電源部１Ａでは、図８に示す電源部１の構成において、スイッチング素子１１がダイオード１１ａに置き替えられ、スイッチング素子１３がダイオード１３ａに置き替えられた交流直流変換器８Ａが示されている。図９に示す構成においても、スイッチング素子１２，１４のスイッチング動作によってコモンモード電流が発生する。このため、実施の形態１における帰還電流調整部５，５Ａは、電源部１Ａが図９に示す交流直流変換器８Ａを備える場合においても、コモンモード電流の調整に有効である。 FIG. 9 is a diagram showing a configuration example different from that of FIG. 8 when the power supply unit 1A includes an AC / DC converter. In the power supply unit 1A shown in FIG. 9, in the configuration of the power supply unit 1 shown in FIG. 8, the AC / DC converter 8A in which the switching element 11 is replaced with the diode 11a and the switching element 13 is replaced with the diode 13a is shown. ing. Also in the configuration shown in FIG. 9, a common mode current is generated by the switching operation of the switching elements 12 and 14. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current even when the power supply unit 1A includes the AC / DC converter 8A shown in FIG.
　図１０は、電源部１Ｂに交流直流変換器が含まれる場合の図８及び図９とは異なる構成例を示す図である。図１０に示す電源部１Ｂでは、図８に示す電源部１の構成において、スイッチング素子１３がダイオード１３ｂに置き替えられ、スイッチング素子１４がダイオード１４ｂに置き替えられた交流直流変換器８Ｂが示されている。図１０に示す構成においても、スイッチング素子１１，１２のスイッチング動作によってコモンモード電流が発生する。このため、実施の形態１における帰還電流調整部５，５Ａは、電源部１Ｂが図１０に示す交流直流変換器８Ｂを備える場合においても、コモンモード電流の調整に有効である。 FIG. 10 is a diagram showing a configuration example different from that of FIGS. 8 and 9 when the power supply unit 1B includes an AC / DC converter. In the power supply unit 1B shown in FIG. 10, in the configuration of the power supply unit 1 shown in FIG. 8, the AC / DC converter 8B in which the switching element 13 is replaced with the diode 13b and the switching element 14 is replaced with the diode 14b is shown. ing. Also in the configuration shown in FIG. 10, a common mode current is generated by the switching operation of the switching elements 11 and 12. Therefore, the feedback current adjusting units 5 and 5A in the first embodiment are effective for adjusting the common mode current even when the power supply unit 1B includes the AC / DC converter 8B shown in FIG.
　以上説明したように、実施の形態１によれば、各相巻線の結線状態がスター結線又はデルタ結線の何れかに切り替え可能に構成される電動機を駆動する電動機駆動装置は、電力変換部から電動機を介して電源部に帰還するコモンモード電流を含む帰還電流を調整する帰還電流調整部を備える。この帰還電流調整部によれば、電動機から大地を経由して電源部に向かうコモンモード電流を小さくすることができる。これにより、コモンモード電流の電源部側への流出を抑制することができ、他の機器に悪影響を及ぼすコモンモードノイズを抑制することができる。 As described above, according to the first embodiment, the electric motor drive device for driving the electric motor configured so that the connection state of each phase winding can be switched to either star connection or delta connection is from the power conversion unit. It is provided with a feedback current adjusting unit that adjusts a feedback current including a common mode current that returns to the power supply unit via an electric motor. According to this feedback current adjusting unit, the common mode current from the electric motor to the power supply unit via the ground can be reduced. As a result, the outflow of the common mode current to the power supply unit side can be suppressed, and the common mode noise that adversely affects other devices can be suppressed.
　また、実施の形態１によれば、帰還電流調整部は、電動機の結線状態がデルタ結線であるときの帰還電流を、結線切替部を介して引き込む第１の引き込み部を具備する。これにより、他の機器に悪影響を及ぼすコモンモードノイズを、比較的簡易且つ安価な手段で抑制することができる。 Further, according to the first embodiment, the feedback current adjusting unit includes a first lead-in unit that draws in the feedback current when the connection state of the motor is delta connection via the connection switching unit. As a result, common mode noise that adversely affects other devices can be suppressed by relatively simple and inexpensive means.
　また、実施の形態１によれば、帰還電流調整部は、電動機の結線状態がスター結線であるときの帰還電流を、結線切替部を介して引き込む第２の引き込み部を具備する。これにより、他の機器に悪影響を及ぼすコモンモードノイズを、比較的簡易且つ安価な手段で抑制することができる。 Further, according to the first embodiment, the feedback current adjusting unit includes a second lead-in portion that draws in the feedback current when the connection state of the motor is star connection through the connection switching unit. As a result, common mode noise that adversely affects other devices can be suppressed by relatively simple and inexpensive means.
　また、実施の形態１によれば、帰還電流調整部は、帰還電流を引き込むか否かを選択可能に構成されている。これにより、電動機種別又は装置構成に対応させて、実装又は非実装を決定することができる。 Further, according to the first embodiment, the feedback current adjusting unit is configured to be able to select whether or not to draw in the feedback current. Thereby, it is possible to decide whether to mount or not to mount the motor according to the motor type or the device configuration.
　なお、電動機駆動装置の構成要素である電力変換部、結線切替部及び帰還電流調整部のうちの少なくとも２つの構成部は、同一基板上に搭載されていてもよい。これにより、コモンモード電流の調整に際し、交流配線の影響を低減することができる。また、電動機から引き出された各種の引き出し線と、電源部から引き出された各種の電源線との接続が、一般的な電動機の場合と比べて容易となる。 Note that at least two components of the power conversion unit, the connection switching unit, and the feedback current adjusting unit, which are the components of the electric motor drive device, may be mounted on the same substrate. As a result, the influence of the AC wiring can be reduced when adjusting the common mode current. Further, the connection between the various lead wires drawn from the electric motor and the various power supply lines drawn from the power supply unit becomes easier than in the case of a general electric motor.
　特に、結線切替部と電力変換部とを同一基板上に搭載すれば、配線経路と大地との間に存在する浮遊容量を低減することができる。これにより、コモンモードノイズの発生を低減することができる。 In particular, if the connection switching unit and the power conversion unit are mounted on the same board, the stray capacitance existing between the wiring path and the ground can be reduced. Thereby, the generation of common mode noise can be reduced.
　次に、実施の形態１における制御部２００のハードウェア構成について、図１１及び図１２の図面を参照して説明する。図１１は、実施の形態１における制御部２００の機能を実現するハードウェア構成の一例を示すブロック図である。図１２は、実施の形態１における制御部２００の機能を実現するハードウェア構成の他の例を示すブロック図である。 Next, the hardware configuration of the control unit 200 according to the first embodiment will be described with reference to the drawings of FIGS. 11 and 12. FIG. 11 is a block diagram showing an example of a hardware configuration that realizes the function of the control unit 200 according to the first embodiment. FIG. 12 is a block diagram showing another example of the hardware configuration that realizes the function of the control unit 200 according to the first embodiment.
　実施の形態１における制御部２００の機能を実現する場合には、図１１に示すように、演算を行うプロセッサ３００、プロセッサ３００によって読みとられるプログラムが保存されるメモリ３０２、及び信号の入出力を行うインタフェース３０４を含む構成とすることができる。 When the function of the control unit 200 according to the first embodiment is realized, as shown in FIG. 11, the processor 300 that performs the calculation, the memory 302 that stores the program read by the processor 300, and the input / output of the signal are input / output. It can be configured to include the interface 304 to be performed.
　プロセッサ３００は、演算装置、マイクロプロセッサ、マイクロコンピュータ、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）、又はＤＳＰ（Ｄｉｇｉｔａｌ　Ｓｉｇｎａｌ　Ｐｒｏｃｅｓｓｏｒ）といった演算手段であってもよい。また、メモリ３０２には、ＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）、フラッシュメモリ、ＥＰＲＯＭ（Ｅｒａｓａｂｌｅ　Ｐｒｏｇｒａｍｍａｂｌｅ　ＲＯＭ）、ＥＥＰＲＯＭ（登録商標）（Ｅｌｅｃｔｒｉｃａｌｌｙ　ＥＰＲＯＭ）といった不揮発性又は揮発性の半導体メモリ、磁気ディスク、フレキシブルディスク、光ディスク、コンパクトディスク、ミニディスク、ＤＶＤ（Ｄｉｇｉｔａｌ　Ｖｅｒｓａｔｉｌｅ　Ｄｉｓｃ）を例示することができる。 The processor 300 may be an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor). Further, the memory 302 includes a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Program ROM), and an EPROM (registered trademark) (Electrically EPROM). Examples thereof include magnetic disks, flexible disks, optical disks, compact disks, mini disks, and DVDs (Digital Versailles Disc).
　メモリ３０２には、実施の形態１における制御部２００の機能を実行するプログラムが格納されている。プロセッサ３００は、インタフェース３０４を介して必要な情報を授受し、メモリ３０２に格納されたプログラムをプロセッサ３００が実行し、メモリ３０２に格納されたテーブルをプロセッサ３００が参照することにより、上述した処理を行うことができる。プロセッサ３００による演算結果は、メモリ３０２に記憶することができる。 The memory 302 stores a program that executes the function of the control unit 200 according to the first embodiment. The processor 300 sends and receives necessary information via the interface 304, the processor 300 executes a program stored in the memory 302, and the processor 300 refers to a table stored in the memory 302 to perform the above-described processing. It can be carried out. The calculation result by the processor 300 can be stored in the memory 302.
　また、実施の形態１における制御部２００の機能を実現する場合には、図１２に示す処理回路３０５を用いることもできる。処理回路３０５は、単一回路、複合回路、ＡＳＩＣ（Ａｐｐｌｉｃａｔｉｏｎ　Ｓｐｅｃｉｆｉｃ　Ｉｎｔｅｇｒａｔｅｄ　Ｃｉｒｃｕｉｔ）、ＦＰＧＡ（Ｆｉｅｌｄ－Ｐｒｏｇｒａｍｍａｂｌｅ　Ｇａｔｅ　Ａｒｒａｙ）、又は、これらを組み合わせたものが該当する。処理回路３０５に入力する情報、及び処理回路３０５から出力する情報は、インタフェース３０４を介して入手することができる。なお、処理回路３０５を用いる構成でも、制御部２００における一部の処理は、図１１に示す構成のプロセッサ３００で実施してもよい。 Further, when the function of the control unit 200 according to the first embodiment is realized, the processing circuit 305 shown in FIG. 12 can also be used. The processing circuit 305 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. The information input to the processing circuit 305 and the information output from the processing circuit 305 can be obtained via the interface 304. Even in the configuration using the processing circuit 305, some processing in the control unit 200 may be performed by the processor 300 having the configuration shown in FIG.
実施の形態２．
　図１３は、実施の形態２に係る空気調和機２４０の構成例を示す図である。実施の形態２に係る空気調和機２４０は、実施の形態１で説明した電動機駆動装置１００を備える。空気調和機２４０は、実施の形態１における電動機２を内蔵した圧縮機２５１と、四方弁２５９と、室外熱交換器２５２と、膨張弁２６１と、室内熱交換器２５７とが冷媒配管２６２を介して取り付けられた冷凍サイクルを備えて、セパレート形空気調和機を構成している。なお、実施の形態１と同一又は同等の機能を有する構成要素には、実施の形態１と同一の符号を付している。 Embodiment 2.
FIG. 13 is a diagram showing a configuration example of the air conditioner 240 according to the second embodiment. The air conditioner 240 according to the second embodiment includes the electric motor driving device 100 described in the first embodiment. In the air conditioner 240, the compressor 251 incorporating the electric motor 2 in the first embodiment, the four-way valve 259, the outdoor heat exchanger 252, the expansion valve 261 and the indoor heat exchanger 257 are connected via a refrigerant pipe 262. It is equipped with a refrigeration cycle installed in the air conditioner to form a separate air conditioner. The components having the same or equivalent functions as those of the first embodiment are designated by the same reference numerals as those of the first embodiment.
　圧縮機２５１の内部には、冷媒を圧縮する圧縮機構２５０と、圧縮機構２５０を動作させる電動機２とが設けられている。圧縮機２５１と室外熱交換器２５２との間、及び圧縮機２５１と室内熱交換器２５７との間を冷媒が循環することで冷暖房などを行う冷凍サイクルが構成されている。なお、図１３に示した構成は、空気調和機だけでなく、冷蔵庫、冷凍庫といった冷凍サイクルを備える冷凍サイクル装置に適用可能である。 Inside the compressor 251 is provided with a compression mechanism 250 for compressing the refrigerant and an electric motor 2 for operating the compression mechanism 250. A refrigeration cycle is configured in which the refrigerant circulates between the compressor 251 and the outdoor heat exchanger 252 and between the compressor 251 and the indoor heat exchanger 257 to perform heating and cooling. The configuration shown in FIG. 13 can be applied not only to an air conditioner but also to a refrigerating cycle apparatus including a refrigerating cycle such as a refrigerator and a freezer.
　なお、以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is configured without departing from the gist of the present invention. It is also possible to omit or change a part of.
　１，１Ａ，１Ｂ　電源部、１ａ，１ｂ，２ｕ_１，２ｕ_２，２ｖ_１，２ｖ_２，２ｗ_１，２ｗ_２，３Ｎ，３ｕ，３ｖ，３ｗ，３ｕ_１，３ｖ_１，３ｗ_１，３ｕ_２，３ｖ_２，３ｗ_２，４ａ，４ｂ，４ｕ，４ｖ，４ｗ，５Ｎ，５ｕ，５ｖ，５ｗ　端子、２　電動機、３　結線切替部、３ｕ_３，３ｖ_３，３ｗ_３　接続配線、４　電力変換部、５，５Ａ　帰還電流調整部、８，８Ａ，８Ｂ　交流直流変換器、１０　交流電源、１１，１２，１３，１４　スイッチング素子、１１ａ，１３ａ，１３ｂ，１４ｂ，４０ｂ　ダイオード、２１　Ｕ相巻線、２２　Ｖ相巻線、２３　Ｗ相巻線、３０ｕ，３０ｖ，３０ｗ，３２Ｎ，３２ｕ，３２ｖ，３２ｗ　接続線、３１，３２，３３　切替器、４０ａ　トランジスタ、４０ｕ，４０ｖ，４０ｗ　レグ、４１，４３，４５　上アーム素子、４２，４４，４６　下アーム素子、４８ｕ，４８ｖ，４８ｗ，５０ｄ　接続点、５０ａ，５０ｂ　電源線、５０ｕ_１，５０ｕ_２，５０ｖ_１，５０ｖ_２，５０ｗ_１，５０ｗ_２　引き出し線、５０ｃ　中点、５１，５２　バイパスコンデンサ、５３，５５　開閉スイッチ、５４，５６，５７，５８，５９　カップリングコンデンサ、１００，１００Ａ　電動機駆動装置、１１０，１１０Ａ　電力供給部、２００　制御部、２１０　結線切替信号伝達部、２２０　駆動信号伝達部、２３０　帰還選択信号伝達部、２４０　空気調和機、２５０　圧縮機構、２５１　圧縮機、２５２　室外熱交換器、２５７　室内熱交換器、２５９　四方弁、２６１　膨張弁、２６２　冷媒配管、３００　プロセッサ、３０２　メモリ、３０４　インタフェース、３０５　処理回路。 1,1A, 1B Power supply unit, 1a, 1b, 2u_1,2u_2,2v_1,2v_2,2w_1,2w_2,3N, 3u, 3v, 3w, 3u_1,3v_1,3w_1,3u_2,3v_2,3w_2,4a, 4b, 4u, 4v, 4w, 5N, 5u, 5v, 5w terminal, 2 electric motor, 3 connection switching part, 3u_3, 3v_3, 3w_3 connection wiring, 4 power conversion part, 5,5A feedback current adjustment part, 8,8A, 8B AC / DC conversion Instrument, 10 AC power supply, 11, 12, 13, 14 switching element, 11a, 13a, 13b, 14b, 40b diode, 21 U-phase winding, 22 V-phase winding, 23 W-phase winding, 30u, 30v, 30w , 32N, 32u, 32v, 32w connection line, 31, 32, 33 switch, 40a transistor, 40u, 40v, 40w leg, 41, 43, 45 upper arm element, 42, 44, 46 lower arm element, 48u, 48v , 48w, 50d connection point, 50a, 50b power supply line, 50u_1,50u_2,50v_1,50v_2,50w_1,50w_2 lead wire, 50c middle point, 51,52 bypass capacitor, 53,55 open / close switch, 54,56,57,58 , 59 Coupling condenser, 100, 100A electric motor drive, 110, 110A power supply, 200 control, 210 connection switching signal transmission, 220 drive signal transmission, 230 feedback selection signal transmission, 240 air conditioner, 250 Compression mechanism, 251 compressor, 252 outdoor heat exchanger, 257 indoor heat exchanger, 259 four-way valve, 261 expansion valve, 262 refrigerant wiring, 300 processor, 302 memory, 304 interface, 305 processing circuit.

Claims (12)

  1. 　中性点が切り離されて引き出された合計６本の引き出し線を有する電動機を駆動する電動機駆動装置であって、
    　前記電動機の各相巻線をスター結線又はデルタ結線の何れかに切り替える結線切替部と、
    　前記電動機に供給する電力を生成する電源部と、
    　前記電源部から供給される直流電力の電圧を任意の交流周波数の電圧の交流電力に変換する電力変換部と、
    　前記電力変換部から前記電動機を介して前記電源部に帰還するコモンモード電流を含む帰還電流を調整する帰還電流調整部と、
    　を備えた電動機駆動装置。     It is an electric motor drive device that drives an electric motor having a total of 6 lead wires drawn out with the neutral point separated.
    A connection switching unit that switches each phase winding of the motor to either star connection or delta connection, and
    A power supply unit that generates electric power to be supplied to the electric motor,
    A power conversion unit that converts the voltage of DC power supplied from the power supply unit into AC power with a voltage of an arbitrary AC frequency, and
    A feedback current adjusting unit that adjusts a feedback current including a common mode current that returns from the power conversion unit to the power supply unit via the electric motor.
    Electric motor drive device equipped with.
  2. 　前記電力変換部、前記結線切替部及び前記帰還電流調整部のうちの少なくとも２つの構成部が同一基板上に搭載されている
    　請求項１に記載の電動機駆動装置。     The electric motor drive device according to claim 1, wherein at least two components of the power conversion unit, the connection switching unit, and the feedback current adjusting unit are mounted on the same substrate.
  3. 　前記帰還電流調整部は、前記電動機の結線状態がデルタ結線であるときの前記帰還電流を、前記結線切替部を介して引き込む第１の引き込み部を具備する
    　請求項１又は２に記載の電動機駆動装置。     The motor drive according to claim 1 or 2, wherein the feedback current adjusting unit includes a first lead-in portion that draws the feedback current when the connection state of the electric motor is delta connection via the connection switching portion. apparatus.
  4. 　前記帰還電流調整部には、高電位側の第１電源線と低電位側の第２電源線とが引き通され、
    　直列に接続されて前記第１電源線と前記第２電源線との間に配される２つのコンデンサが具備され、
    　前記第１の引き込み部の一方は、前記結線切替部に電気的に接続され、
    　前記第１の引き込み部の他方は、２つの前記コンデンサの接続点である中点に電気的に接続される
    　請求項３に記載の電動機駆動装置。     A first power supply line on the high potential side and a second power supply line on the low potential side are passed through the feedback current adjusting unit.
    Two capacitors connected in series and arranged between the first power supply line and the second power supply line are provided.
    One of the first lead-in portions is electrically connected to the connection switching portion.
    The electric motor drive device according to claim 3, wherein the other of the first lead-in portion is electrically connected to a midpoint which is a connection point between the two capacitors.
  5. 　前記帰還電流調整部は、前記電動機の結線状態がスター結線であるときの前記帰還電流を、前記結線切替部を介して引き込む第２の引き込み部を具備する
    　請求項１から４の何れか１項に記載の電動機駆動装置。     Any one of claims 1 to 4, wherein the feedback current adjusting unit includes a second lead-in portion that draws in the feedback current when the connection state of the electric motor is a star connection via the connection switching portion. The electric motor drive device described in.
  6. 　前記帰還電流調整部には、高電位側の第１電源線と低電位側の第２電源線とが引き通され、
    　直列に接続されて前記第１電源線と前記第２電源線との間に配される２つのコンデンサが具備され、
    　前記第２の引き込み部の一方は、前記結線切替部に電気的に接続され、
    　前記第２の引き込み部の他方は、２つの前記コンデンサの接続点である中点に電気的に接続される
    　請求項５に記載の電動機駆動装置。     A first power supply line on the high potential side and a second power supply line on the low potential side are passed through the feedback current adjusting unit.
    Two capacitors connected in series and arranged between the first power line and the second power line are provided.
    One of the second lead-in portions is electrically connected to the connection switching portion.
    The electric motor drive device according to claim 5, wherein the other of the second lead-in portion is electrically connected to a midpoint which is a connection point of the two capacitors.
  7. 　前記帰還電流調整部は、前記帰還電流を引き込むか否かを選択可能に構成されている
    　請求項３から６の何れか１項に記載の電動機駆動装置。     The electric motor driving device according to any one of claims 3 to 6, wherein the feedback current adjusting unit is configured to be able to select whether or not to draw the feedback current.
  8. 　前記中点は接地される
    　請求項４又は６に記載の電動機駆動装置。     The electric motor drive device according to claim 4 or 6, wherein the midpoint is grounded.
  9. 　前記電力変換部は、直流交流変換器である
    　請求項１から８の何れか１項に記載の電動機駆動装置。     The electric motor drive device according to any one of claims 1 to 8, wherein the power conversion unit is a DC / AC converter.
  10. 　前記電源部は、交流直流変換器を含む
    　請求項１から９の何れか１項に記載の電動機駆動装置。     The electric motor drive device according to any one of claims 1 to 9, wherein the power supply unit includes an AC / DC converter.
  11. 　請求項１から１０の何れか１項に記載の電動機駆動装置を備えた空気調和機。 An air conditioner including the electric motor drive device according to any one of claims 1 to 10.
  12. 　請求項１から１０の何れか１項に記載の電動機駆動装置を備えた冷凍サイクル装置。 A refrigeration cycle device including the electric motor drive device according to any one of claims 1 to 10.
PCT/JP2019/034258 2019-08-30 2019-08-30 Electric motor driving device, air-conditioner, and refrigeration cycle apparatus WO2021038864A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11235081A (en) * 1998-02-20 1999-08-27 Hitachi Ltd Load device drive system
JP2008228513A (en) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp Motor drive device and driving method, and refrigerating and air-conditioning device
WO2019026257A1 (en) * 2017-08-03 2019-02-07 三菱電機株式会社 Electric motor system and outdoor unit equipped with electric motor system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11235081A (en) * 1998-02-20 1999-08-27 Hitachi Ltd Load device drive system
JP2008228513A (en) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp Motor drive device and driving method, and refrigerating and air-conditioning device
WO2019026257A1 (en) * 2017-08-03 2019-02-07 三菱電機株式会社 Electric motor system and outdoor unit equipped with electric motor system

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