WO2016046992A1 - 室内機及び空気調和機 - Google Patents
室内機及び空気調和機 Download PDFInfo
- Publication number
- WO2016046992A1 WO2016046992A1 PCT/JP2014/075748 JP2014075748W WO2016046992A1 WO 2016046992 A1 WO2016046992 A1 WO 2016046992A1 JP 2014075748 W JP2014075748 W JP 2014075748W WO 2016046992 A1 WO2016046992 A1 WO 2016046992A1
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- WIPO (PCT)
- Prior art keywords
- fan motor
- indoor unit
- unit
- inverter
- fan
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
- F24F1/0033—Indoor units, e.g. fan coil units characterised by fans having two or more fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
Definitions
- the present invention relates to an indoor unit and an air conditioner.
- Patent Document 1 includes a PWM modulation type three-phase inverter, a plurality of fan motors are connected as loads of each inverter, and a plurality of fan motors controlling each of the fan motors.
- the same number of fan motor control means and system control means for controlling the entire system are provided, and in controlling each fan motor, data communication is performed between the system control means and the plurality of fan motor control means.
- a method for controlling a plurality of fan motors has been proposed.
- the present invention has been made in view of the above, and an object thereof is to provide an indoor unit and an air conditioner that can improve the controllability of a fan motor in a free-run state.
- the present invention is an indoor unit of an air conditioner, and includes a plurality of fan motors and a plurality of fan motors for individually driving the plurality of fan motors.
- a power converter, and one and a common control unit that performs control calculations for each of the fan motors and generates individual drive signals to be applied to each of the plurality of power converters.
- the present invention in the indoor unit of an air conditioner, there is an effect that it is possible to improve the controllability of the fan motor in a free-run state.
- FIG. 1 is a diagram illustrating a configuration example of an air conditioner according to Embodiment 1.
- FIG. 2 is a diagram illustrating a configuration example of a power conversion device provided in the indoor unit according to the first embodiment and a peripheral circuit of the power conversion device.
- FIG. 3 is a diagram illustrating a configuration example of a control unit according to the first embodiment.
- FIG. 4 is a diagram illustrating a situation in which one fan motor is driving and the other fan motor is stopped.
- FIG. 5 is a diagram showing a control flow in the case of starting from the free-run state.
- FIG. 6 is a diagram illustrating a configuration example of a power conversion device provided in the indoor unit according to the second embodiment and a peripheral circuit of the power conversion device.
- FIG. 7 is a diagram illustrating a configuration example of a control unit according to the second embodiment.
- FIG. 1 is a diagram illustrating a configuration example of an air conditioner according to Embodiment 1.
- the air conditioner according to Embodiment 1 includes an indoor unit 40, an outdoor unit 80, a gas refrigerant pipe 58 and a liquid refrigerant pipe 59 that connect the indoor unit 40 and the outdoor unit 80.
- an aperture device 87 is provided.
- the outdoor unit 80 includes a compressor 81 that compresses and discharges the refrigerant.
- a four-way valve 82, an outdoor heat exchanger 86, and a throttle device 87 which are flow path switching means for switching the flow path of the refrigerant, are sequentially connected by a pipe, and constitute a part of the refrigerant circuit.
- a four-way valve 82 and an accumulator 84 are sequentially connected to the suction side of the compressor 81 by piping.
- the four-way valve 82 is connected to the gas refrigerant pipe 58.
- An outdoor unit fan 85 is provided in the vicinity of the outdoor heat exchanger 86.
- the outdoor heat exchanger 86 is composed of, for example, a tube-type heat exchanger composed of a heat transfer tube and a large number of fins, and acts as a condenser during cooling operation and as an evaporator during heating operation.
- the outdoor unit fan 85 is driven by a fan motor (not shown), and can adjust the air volume by changing the number of rotations of the motor to adjust the air flow rate.
- the expansion device 87 is constituted by an electronic expansion valve, for example, and adjusts the flow rate of the refrigerant by setting the opening, and functions as a pressure reducing valve and an expansion valve to decompress and expand the refrigerant. 1 illustrates the case where the expansion device 87 is provided in the outdoor unit 80, but the expansion device 87 may be provided in the indoor unit 40.
- the indoor unit 40 individually drives the indoor heat exchanger 55, the first and second indoor unit fans (51, 52), and the first and second indoor unit fans (51, 52).
- the first and second inverters (41, 42) that are power converters are provided.
- the first indoor unit fan 51 includes a first fan motor 51a driven by the first inverter 41, and a first blade 51b rotated by the first fan motor 51a.
- the second indoor unit fan 52 has the same configuration, and includes a second fan motor 52a driven by the second inverter 42 and a second blade 52b rotated by the second fan motor 52a.
- the first and second fan motors (51a, 52a) are preferably permanent magnet type synchronous motors having high induced voltage constants and high efficiency.
- the indoor heat exchanger 55 is connected between the gas refrigerant pipe 58 and the liquid refrigerant pipe 59, and constitutes the refrigerant circuit of the air conditioner together with the refrigerant circuit of the outdoor unit 80.
- the indoor heat exchanger 55 is composed of, for example, a tube-type heat exchanger composed of heat transfer tubes and a large number of fins, and functions as an evaporator during cooling operation and as a condenser during heating operation.
- the first and second indoor unit fans (51, 52) blow the air heat-exchanged by the indoor heat exchanger 55 to the air-conditioned space in the room.
- the first and second fan motors (51a, 52a) individually drive the first and second blades (51b, 52b) in the first and second indoor unit fans (51, 52).
- the first and second inverters (41, 42) respectively drive the first and second fan motors (51a, 52a) individually, and change the motor rotation speed to thereby change the first and second fan motors (51a, 52a).
- the amount of air sent from the indoor unit fans (51, 52) is adjusted.
- FIG. 1 shows a configuration including two indoor unit fans and two inverters, the number is not limited to two, and each includes three or more indoor unit fans and the indoor unit fans.
- a configuration including a corresponding inverter also forms the gist of the present invention.
- FIG. 2 is a diagram illustrating a configuration example of a power converter provided in the indoor unit according to the first embodiment and a peripheral circuit of the power converter.
- the first inverter 41 and the second inverter 42 are connected in parallel to the output side of the smoothing means 3, rectified by the rectifier 2, and then supplied with DC power smoothed by the smoothing means 3.
- the rectifier 2 is supplied with AC power from the AC power source 1.
- the DC power smoothed by the smoothing means 3 is converted into three-phase AC power by the first inverter 41 and the second inverter 42, and the three-phase AC power is converted into the first fan motor 51a and the second fan motor 51a. This configuration is supplied to the fan motor 52a.
- the first inverter 41 has U-phase upper arm switching element 411a, V-phase upper arm switching element 412a, and W-phase upper arm switching as main components for supplying three-phase AC power to the first fan motor 51a.
- An element 413a, a U-phase lower arm switching element 411b, a V-phase lower arm switching element 412b, and a W-phase lower arm switching element 413b are configured.
- the U-phase upper arm switching element 411a and the U-phase lower arm switching element 411b are connected in series to constitute one arm. The same applies to other switching elements. That is, the first inverter 41 includes three arms including a U-phase arm, a V-phase arm, and a W-phase arm.
- each phase upper arm switching element the U-phase upper arm switching element, the V-phase upper arm switching element, and the W-phase upper arm switching element
- the U-phase lower arm switching element the V-phase lower arm
- the switching elements and the W-phase lower arm switching elements are collectively referred to as the respective phase lower arm switching elements.
- the second inverter 42 has U-phase upper arm switching element 421a, V-phase upper arm switching element 422a, and W-phase upper as main components for supplying three-phase AC power to the second fan motor 52a.
- An arm switching element 423a, a U-phase lower arm switching element 421b, a V-phase lower arm switching element 422b, and a W-phase lower arm switching element 423b are configured.
- the U-phase upper arm switching element 421a and the U-phase lower arm switching element 421b are connected in series to constitute one arm.
- the second inverter 42 includes three arms including a U-phase arm, a V-phase arm, and a W-phase arm.
- the first fan motor 51a includes first rotor rotational position detecting means 511 that outputs first position signals Hu1, Hv1, Hw1 corresponding to the rotational position of the rotor.
- the second fan motor 52a includes second rotor rotational position detection means 521 that outputs second position signals Hu2, Hv2, Hw2 corresponding to the rotational position of the rotor.
- the control unit 6 is configured by an arithmetic unit such as a microcomputer or a CPU, for example, converts an input analog electric signal into a digital value, and according to the control application of the first fan motor 51a and the second fan motor 52a.
- the controller 6 receives the first position signals Hu1, Hv1, and Hw1, performs control calculation of the first fan motor 51a, and outputs a drive signal for the first inverter 41.
- the second position signals Hu2, Hv2, and Hw2 are input, the control calculation of the second fan motor 52a is performed, and the drive signal of the second inverter 42 is output.
- the bus voltage detector 7 detects the input bus voltage Vdc of the first inverter 41 and the second inverter 42 and outputs the detected value of the input bus voltage Vdc to the controller 6.
- FIG. 3 is a diagram illustrating a configuration example of the control unit 6 according to the first embodiment.
- the control unit 6 according to the first embodiment includes a control calculation unit 61 for controlling the first fan motor 51a, a control calculation unit 62 for controlling the second fan motor 52a, A speed command value generator 63 for generating a speed command value ⁇ m1 * of the first fan motor 51a and a speed command value ⁇ m2 * of the second fan motor 52a, and a drive signal for driving the switching element of the first inverter 41 And a carrier signal generator 64 for generating a carrier signal fc1 for generating a carrier signal fc2 for generating a drive signal for driving the switching element of the second inverter 42.
- the control calculation unit 61 of the first fan motor 51a includes a rotor rotation position and execution speed calculation unit 611, a speed control unit 612, and a drive signal generation unit 613.
- the rotor rotation position and execution speed calculation unit 611 calculates the execution rotation speed ⁇ m1 and the rotor rotation position ⁇ m1 of the first fan motor 51a based on the first position signals Hu1, Hv1, and Hw1.
- the speed controller 612 calculates the first inverter output voltage command values VLu * _a, VLv * _a, and VLw * _a based on the execution speed ⁇ m1, the speed command value ⁇ m1 * , and the input bus voltage Vdc.
- the drive signal generation unit 613 drives the drive signals Sup_a, Sun_a to the first inverter 41.
- Svp_a, Svn_a, Swp_a, and Swn_a are output.
- control calculation unit 62 of the second fan motor 52a includes a rotor rotation position and execution speed calculation unit 621, a speed control unit 622, and a drive signal generation unit 623.
- the rotor rotational position and execution speed calculation unit 621 calculates the effective rotational speed ⁇ m2 and the rotor rotational position ⁇ m2 of the second fan motor 52a based on the second position signals Hu2, Hv2, and Hw2.
- Speed control unit 622 executes the rotation number Omegaemu2, the speed command value Omegaemu2 *, and based on the input bus voltage Vdc, the second inverter output voltage command value VLu * _b, VLv * _b, calculates the VLW * _b.
- Drive signal generating unit 623 a second inverter output voltage command value VLu * _b, VLv * _b, VLw * _b, based on the rotor rotational position ⁇ m2 and carrier signal fc2, the drive signal Sup_b to the second inverter 42, Sun_b , Svp_b, Svn_b, Swp_b, Swn_b.
- a plurality of indoor unit fans can be controlled individually and independently using a plurality of fan motors and inverters.
- the indoor unit has a high market demand for noise, and each inverter is often driven at a carrier frequency higher than the audible range (for example, 16 kHz or higher), and the noise generated by the inverter alone increases. Further, when a plurality of inverters are provided in one indoor unit, noises generated by the inverters may interfere with each other and amplify as a whole. If each fan motor is controlled by a common computing unit, the carrier signal that drives each inverter is held in the computing unit, and the switching of each inverter can be managed synchronously. It is easy to implement an algorithm for canceling (for example, changing the phase difference between carrier signals, correcting the voltage command value of each inverter).
- the DC voltage includes a pulsation component proportional to the power supply frequency (for example, in the case of a single-phase AC voltage, a pulsation component twice the AC voltage frequency).
- a modulation factor obtained by dividing each phase output voltage command value of each inverter by the bus voltage detection value of the inverter is calculated, and a drive signal for the inverter switching element is generated. Since it affects the drive signal generation of the inverter switching element, the speed of each fan motor also pulsates. This velocity pulsation affects the interference sound.
- each fan motor By controlling each fan motor with a common arithmetic unit, it is possible to calculate the modulation factor using the common bus voltage detection value, so an algorithm that suppresses the influence of bus voltage pulsation (for example, each inverter output voltage command value Correction) is easy to implement.
- an algorithm that suppresses the influence of bus voltage pulsation for example, each inverter output voltage command value Correction
- each detected value (rotor position signal in the first embodiment) changes with time. Therefore, unless the detection timing of each detection value is managed, each detection value cannot be handled equally on the time axis.
- the detection timing of each detection value can be arbitrarily determined in the common arithmetic unit, so that the detection timing can be easily managed.
- the detection timing can be grasped and compared in a common arithmetic unit, so it is possible to calculate the time difference and correct the detection value based on the time difference. It becomes.
- the detection timing of each detection value and correcting the detection value it becomes possible to handle each detection value equally on the time axis, so the above-described three effects can be realized. Becomes easier.
- a connector is often used to connect the position detection unit of the fan motor and the board on which the arithmetic unit is mounted.
- a connector is often used to connect the first fan motor and the first inverter, and to connect the second fan motor and the second inverter.
- indoor unit manufacture when connecting the said connector, the case where a connection is mistaken between a 1st fan motor and a 2nd fan motor is assumed.
- the position detection signal of each fan motor can be grasped and compared within the common computing unit, so an algorithm for detecting misconnections can be added.
- connection miswiring can be pointed out and connection correction can be easily performed, so that it is possible to improve the quality and reliability of the product.
- the airflow flows from the suction port (not shown) of the indoor unit 40 through the first blade 51b rotated by the first fan motor 51a and through the blowout port (not shown) of the indoor unit 40.
- the second blade 52b receives the airflow and enters a free-run state.
- the free-run speed at this time is proportional to the effective speed of the first fan motor 51a.
- the lower arm switching elements 421b, 422b, and 423b of the second inverter 42 are controlled to be in the ON state. At this time, since brake torque is generated from the second fan motor 52a, the free-run speed of the second fan motor 52a can be lowered without lowering the speed of the first fan motor 51a.
- the brake torque is obtained from the voltage equation of a three-phase brushless DC motor.
- the voltage equation and torque of a three-phase brushless DC motor are expressed by the following formulas (1) and (2).
- the brake torque of the motor can be expressed by the following Expression (6).
- the lower fan switching elements 421b, 422b, and 423b of the second inverter 42 are turned on, so that the second fan motor 52a obtains the expression (6). Is output, so that the free-run speed can be reduced.
- Fig. 5 shows the control flow when starting from the free-run state.
- a case is assumed where the execution speed ⁇ m2 of the second fan motor 52a is stopped in a free-run state (free-run speed ⁇ f).
- free-running rotational speed ⁇ f is larger than the startable rotational speed ⁇ s
- all the lower arm switching elements 421b, 422b, and 423b of the second inverter 42 are once turned on.
- the effective rotational speed ⁇ m2 of the second fan motor 52a decreases. This state is continued until the effective rotational speed ⁇ m2 of the second fan motor 52a becomes smaller than the startable rotational speed ⁇ s.
- starting processing of the second fan motor 52a is started from the stage when the effective rotational speed ⁇ m2 of the second fan motor 52a becomes smaller than the starting rotational speed ⁇ s.
- the lower arm switching elements 421b, 422b, and 423b of the second inverter 42 are turned on.
- an excessive current flows as an inrush current, and the rotor magnet of the fan motor can be demagnetized.
- the inrush current can be suppressed by gradually increasing the duty ratio of the lower arm switching elements 421b, 422b, and 423b of the second inverter 42.
- any one lower arm switching element or any two lower arm switching elements are turned on without simultaneously turning on all the lower arm switching elements 421b, 422b, and 423b of the second inverter 42. Then, the remaining lower arm switching element may be turned on.
- the lower arm switching elements 421b, 422b, and 423b of the second inverter 42 are turned on, but control is performed to turn on the upper arm switching elements 421a, 422a, and 423a of the second inverter 42. May be.
- the lower arm of the inverter when starting from the free-run state, when the free-run speed is high, the lower arm of the inverter is output so that the brake torque is output from the fan motor.
- the process of turning on the switching element it is possible to easily start up from the free-run state.
- this method it is possible to start without changing the control state of the driving fan motor, so that the controllability as a unit is not impaired.
- FIG. FIG. 6 is a diagram illustrating a configuration example of a power conversion device provided in the indoor unit according to the second embodiment and a peripheral circuit of the power conversion device.
- the U-phase lower arm shunt resistor 421c, the V-phase lower arm shunt resistor 422c, and the W-phase lower arm shunt resistor for detecting the current flowing in each phase are provided. 423c.
- the U-phase lower arm shunt resistance, the V-phase lower arm shunt resistance, and the W-phase lower arm shunt resistance will be collectively referred to as respective phase lower arm shunt resistances.
- each phase Each phase lower arm voltage detector 71a that detects the potentials of arm shunt resistors 411c, 412c, 413c, 421c, 422c, and 423c (hereinafter referred to as “each lower arm voltage”) Vu_1, Vv_1, Vw_1 and Vu_2, Vv_2, Vw_2. , 71b, 71c and 72a, 72b, 72c are provided.
- each phase lower arm voltage Vu_1, Vv_1, Vw_1, which is current information of the first inverter 41, is referred to as first lower arm voltage Vu_1, Vv_1, Vw_1, and the current of the second inverter 42 is referred to.
- Each phase lower arm voltage Vu_2, Vv_2, Vw_2 which is information is referred to as second lower arm voltage Vu_2, Vv_2, Vw_2.
- the control unit 6 receives the lower arm voltages Vu_1, Vv_1, Vw_1, Vu_2, Vv_2, and Vw_2 for each phase, performs a control calculation of the first fan motor 51a, and outputs a drive signal to the first inverter 41. Then, the control calculation of the second fan motor 52a is performed and the drive signal of the second inverter 42 is output.
- FIG. 7 is a diagram illustrating a configuration example of the control unit 6 according to the second embodiment.
- the control unit 6 according to the second embodiment includes a control calculation unit 65 for controlling the first fan motor 51a, a control calculation unit 66 for controlling the second fan motor 52a, A speed command value generator 67 that generates a speed command value ⁇ m1 * of the first fan motor 51a and a speed command value ⁇ m2 * of the second fan motor 52a, and a drive signal that drives the switching element of the first inverter 41 And a carrier signal generation unit 68 that generates a carrier signal fc1 for generating a carrier signal fc2 for generating a drive signal for driving a switching signal of the second inverter 42 and a carrier signal fc1 for generating the second inverter 42.
- the control calculation unit 65 of the first fan motor 51a includes a current calculation unit 651, a coordinate conversion unit 652, a speed and position estimation unit 653, a speed control unit 654, and a drive signal generation unit 655.
- the current calculation unit 651 calculates motor currents iu_a, iv_a, and iw_a of the first fan motor 51a based on the first lower arm voltages Vu_1, Vv_1, and Vw_1.
- the coordinate conversion unit 652 calculates the two-phase rotational coordinate system currents i ⁇ _a and i ⁇ _a using the motor currents iu_a, iv_a, and iw_a of the first fan motor 51a.
- the speed and position estimation unit 653 calculates the effective rotational speed ⁇ m1 and the rotor rotational position ⁇ m1 of the first fan motor 51a based on the two-phase rotational coordinate system currents i ⁇ _a and i ⁇ _a.
- the speed control unit 654 generates a first inverter output voltage command value based on the two-phase rotational coordinate system currents i ⁇ _a and i ⁇ _a, the execution rotational speed ⁇ m1 and the rotor rotational position ⁇ m1, the speed command value ⁇ m1 * , and the bus voltage detection value Vdc.
- VLu * _a, VLv * _a, and VLw * _a are calculated.
- the drive signal generation unit 655 drives the drive signals Sup_a, Sun_a, Svp_a, Svn_a to the first inverter 41. , Swp_a, Swn_a are output.
- the control calculation unit 66 of the second fan motor 51a includes a current calculation unit 661, a coordinate conversion unit 662, a speed and position estimation unit 663, a speed control unit 664, and a drive signal generation unit 665.
- the current calculation unit 661 calculates motor currents iu_b, iv_b, and iw_b of the second fan motor 51a based on the second lower arm voltages Vu_2, Vv_2, and Vw_2.
- the coordinate conversion unit 662 calculates the two-phase rotational coordinate system currents i ⁇ _b and i ⁇ _b using the motor currents iu_b, iv_b, and iw_b of the second fan motor 51a.
- the speed and position estimation unit 663 calculates the effective rotational speed ⁇ m2 and the rotor rotational position ⁇ m2 of the second fan motor 51a based on the two-phase rotational coordinate system currents i ⁇ _b and i ⁇ _b.
- the speed control unit 664 generates a second inverter output voltage command value based on the two-phase rotational coordinate system currents i ⁇ _b and i ⁇ _b, the execution rotational speed ⁇ m2 and the rotor rotational position ⁇ m2, the speed command value ⁇ m2 * , and the bus voltage detection value Vdc.
- VLu * _b, VLv * _b to calculate the VLw * _b.
- a plurality of indoor unit fans can be controlled individually and independently using a plurality of fan motors and inverters.
- the airflow flows from the suction port (not shown) of the indoor unit 40 through the first blade 51b rotated by the first fan motor 51a and through the blowout port (not shown) of the indoor unit 40.
- the second blade 52b receives the airflow and enters a free-run state.
- the free-run speed at this time is proportional to the effective speed of the first fan motor 51a.
- the lower arm switching elements 421b, 422b, and 423b of the second inverter 42 are controlled to be in the ON state. At this time, since brake torque is generated from the second fan motor 52a, the free-run speed of the second fan motor 52a can be lowered without lowering the speed of the first fan motor 51a.
- the brake torque of the motor can be expressed by equation (6) as in the first embodiment.
- the lower fan switching elements 421b, 422b, and 423b of the second inverter 42 are turned on, so that the second fan motor 52a obtains the equation (6 ) Is output, the free-run speed can be reduced and the start-up from the free-run state is facilitated.
- the first fan motor 51a can be started without operating the state of the first fan motor 51a, so that the controllability as an indoor unit is improved. It is done.
- the configurations shown in the first and second embodiments are examples of the configuration of the present invention, and can be combined with other known techniques, and can be combined within a range not departing from the gist of the present invention. It goes without saying that it is possible to change the configuration, for example, by omitting a part and combining a part.
- the present invention is suitable for use in indoor units and air conditioners.
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Abstract
Description
図1は、実施の形態1に係る空気調和機の一構成例を示す図である。図1に示すように、実施の形態1に係る空気調和機は、室内機40、室外機80、これらの室内機40と室外機80との間を接続するガス冷媒配管58及び液冷媒配管59並びに、絞り装置87を備えている。
vd,vq:d,q軸モータ印加電圧
id,iq:d,q軸モータ電流
τm:モータ出力トルク
Ld,Lq:d,q軸モータインダクタンス
R:モータ相抵抗
ω:角速度
φf:モータ誘起電圧定数
P:極対数
s:ラプラス演算子
図6は、実施の形態2の室内機に設けられる電力変換装置及び当該電力変換装置の周辺回路の一構成例を示す図である。
Claims (6)
- 空気調和機の室内機であって、
複数のファンモータと、
前記複数のファンモータのそれぞれを個別に駆動するための複数の電力変換器と、
前記ファンモータのそれぞれの制御演算を行い前記複数の電力変換器のそれぞれに付与する個別の駆動信号を生成する一つ且つ共通の制御部と、
を備える室内機。 - 前記ファンモータの少なくとも一つが駆動状態であり、前記駆動状態のファンモータ以外のファンモータのうち少なくとも一つがフリーラン状態であるとき、
前記制御部は、前記フリーラン状態のファンモータに接続される電力変換器のスイッチング素子のうち少なくとも一つを駆動して当該フリーラン状態のファンモータに制動力を付与した後に当該ファンモータを起動する請求項1に記載の室内機。 - 前記ファンモータを起動する際に制御するスイッチング素子は前記電力変換器における下アームスイッチング素子である請求項1または2に記載の室内機。
- 前記ファンモータを起動する際に制御するスイッチング素子は前記電力変換器における上アームスイッチング素子である請求項1または2に記載の室内機。
- 前記ファンモータは永久磁石型同期モータである請求項1から4の何れか1項に記載の室内機。
- 請求項1から5の何れか1項に記載の室内機を備えた空気調和機。
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