WO2021054302A1 - Power supply device, cable-equipped power supply device, and electric tool - Google Patents

Power supply device, cable-equipped power supply device, and electric tool Download PDF

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Publication number
WO2021054302A1
WO2021054302A1 PCT/JP2020/034812 JP2020034812W WO2021054302A1 WO 2021054302 A1 WO2021054302 A1 WO 2021054302A1 JP 2020034812 W JP2020034812 W JP 2020034812W WO 2021054302 A1 WO2021054302 A1 WO 2021054302A1
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WO
WIPO (PCT)
Prior art keywords
power supply
supply device
main body
power
inverter
Prior art date
Application number
PCT/JP2020/034812
Other languages
French (fr)
Japanese (ja)
Inventor
文昭 伊藤
Original Assignee
京セラインダストリアルツールズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラインダストリアルツールズ株式会社 filed Critical 京セラインダストリアルツールズ株式会社
Priority to JP2021546661A priority Critical patent/JP7300513B2/en
Publication of WO2021054302A1 publication Critical patent/WO2021054302A1/en
Priority to JP2023100023A priority patent/JP2023123605A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • This disclosure relates to power tools.
  • Patent Document 1 describes a technique related to a power tool.
  • a power supply device, a power supply device with a cable, and a power tool are disclosed.
  • the power supply is a power supply connected to a power tool body comprising a brushless DC motor.
  • the power supply device includes at least one of an inverter for driving a brushless DC motor and a control circuit for controlling the inverter, and a power supply unit for supplying power to the inverter.
  • the power supply device with a cable includes the above power supply device and a connection cable for connecting the power supply device and the power tool main body.
  • the power tool includes the above power supply device and a power tool main body including a brushless DC motor to which the power supply device is connected.
  • FIG. 1 is a diagram schematically showing a configuration example of the power tool 1.
  • the power tool 1 includes a power tool main body 2, a power supply device 3, a connection cable 4, and a connection cable 5.
  • the power tool 1 shown in FIG. 1 is, for example, a hand-held disc grinder.
  • the power tool 1 may be a hand-held power tool other than the disc grinder.
  • the power tool 1 may be an impact driver, a driver drill, a circular saw, a reciprocating saw, or a polisher.
  • the power tool main body 2 may be simply referred to as a main body 2.
  • the main body 2 includes a housing 20 that accommodates a plurality of parts and is gripped by a user.
  • the housing 20 houses a brushless DC motor 21, a sensor board 22, a cooling fan 23, a connector 24, and the like.
  • the main body 2 also includes a drive unit driven by a brushless DC motor 21.
  • the drive unit includes, for example, a gear unit housed in the housing 20 and a disc-shaped grindstone 25 exposed from the housing 20.
  • the gear portion transmits the rotation of the brushless DC motor 21 to the grindstone 25 by reducing its rotation speed.
  • the brushless DC motor 21 can rotate the grindstone 25 via the gear portion.
  • the power tool 1 can perform grinding, cutting, polishing, and the like by rotating the grindstone 25.
  • the brushless DC motor 21 is driven by the power supply device 3.
  • the sensor board 22 can detect the rotational position of the brushless DC motor 21. More specifically, the sensor substrate 22 can detect the rotational position of the rotor included in the brushless DC motor 21.
  • the cooling fan 23 is connected to the rotating shaft 210 of the brushless DC motor 21. The cooling fan 23 rotates as the rotating shaft 210 rotates. When the cooling fan 23 rotates, air is taken into the housing 20 from the intake port provided at the rear of the housing 20. The air taken in from the intake port cools the brushless DC motor 21 and the like in the housing 20, and then is discharged to the outside of the housing 20 from the exhaust port provided in front of the housing 20.
  • the connector 24 is partially exposed from the housing 20, and the connection cable 4 is connected to the connector 24. It can be said that the connector 24 is a connection point to which the connection cable 4 is connected.
  • the brushless DC motor 21 may be simply referred to as a motor 21.
  • the power supply device 3 is a device separate from the main body 2 and includes a housing 30 for accommodating a plurality of parts.
  • the housing 30 houses the circuit board 31, the connector 37, and the connector 38.
  • the circuit board 31 includes a board 32, a power supply unit 33 mounted on the board 32, a control circuit 34, and an inverter 35.
  • the power supply unit 33 can supply power to the inverter 35.
  • the power supply unit 33 converts, for example, an AC voltage supplied from a commercial power source into a DC voltage, and supplies the generated DC voltage to the inverter 35.
  • the power supply unit 33 can be said to be a power supply circuit.
  • the inverter 35 can drive the motor 21 included in the main body 2.
  • the control circuit 34 can control the inverter 35.
  • the connector 37 is partially exposed from the housing 30.
  • the connection cable 4 is connected to the connector 37. It can be said that the connector 37 is a connection point to which the connection cable 4 is connected.
  • the connection cable 4 extends from the housing 30 of the power supply device 3 to the housing 20 of the main body 2.
  • the length of the connection cable 4 is, for example, several tens of cm to several m. The length of the connection cable 4 is not limited to this.
  • the connector 38 is partially exposed from the housing 30.
  • the connection cable 5 is connected to the connector 38. It can be said that the connector 38 is a connection point to which the connection cable 5 is connected.
  • connection cable 4 At one end of the connection cable 4, a connector 41 connected to the connector 24 of the main body 2 is provided. At the other end of the connection cable 4, a connector 42 connected to the connector 37 of the power supply device 3 is provided. At one end of the connection cable 5, a connector 51 connected to the connector 38 of the power supply device 3 is provided. At the other end of the connection cable 5, a connector 52 connected to an outlet that supplies an AC voltage from a commercial power source is provided. The connector 52 is sometimes called a power plug.
  • connection cable 4 can be attached to and detached from the main body 2.
  • the connector 41 of the connection cable 4 is removable from the connector 24 of the main body 2.
  • the other end of the connection cable 4 is detachable from the power supply device 3.
  • the connector 42 of the connection cable 4 is removable from the connector 37 in the housing 30.
  • connection cable 5 is detachable from the power supply device 3.
  • the connector 51 of the connection cable 5 is removable from the connector 38 in the housing 30.
  • the connector 52 of the connection cable 5 is removable from the outlet.
  • the power tool 1 includes a power supply device 300 with a cable including a power supply device 3 and connection cables 4 and 5.
  • FIG. 2 is a diagram mainly showing an example of the circuit configuration of the power tool 1.
  • a single-phase AC voltage from a commercial power source is supplied to the connector 52 of the connection cable 5.
  • the AC voltage is supplied to the connector 38 of the power supply device 3 through the connection cable 5.
  • the connection cable 5 has two signal lines 50a. For example, an AC voltage having an effective value of 100 V is supplied to the connector 38.
  • the AC voltage supplied to the connector 38 is supplied to the power supply unit 33.
  • the power supply unit 33 includes an AC-DC converter 330.
  • the AC-DC converter 330 converts an AC voltage into a DC voltage and outputs it.
  • the AC-DC converter 330 is composed of, for example, a rectifier circuit, and has a diode and a capacitor.
  • the AC-DC converter 330 outputs a DC voltage of, for example, about 140V.
  • the DC voltage output by the AC-DC converter 330 is supplied to the control circuit 34. Further, the DC voltage output by the AC-DC converter 330 is supplied to the inverter 35 as a power source.
  • the inverter 35 includes, for example, six switching elements 350.
  • the switching element 350 is, for example, a FET (Field effect transistor).
  • the switching element 350 may be an IGBT (Insulated Gate Bipolar Transistor) or another element.
  • IGBT Insulated Gate Bipolar Transistor
  • three switching circuits including two switching elements 350 connected in series are connected in parallel. In each switching circuit, the voltage at the connection point of the two switching elements is supplied to the motor 21 as a drive signal 351.
  • the three drive signals 351 generated by the inverter 35 are supplied to the motor 21 through the connector 37 of the power supply device 3, the connection cable 4, and the connector 24 of the main body 2.
  • the connection cable 4 includes three signal lines 40a for transmitting the three drive signals 351 from the power supply device 3 to the main body 2.
  • the motor 21 is, for example, a three-phase motor, and includes a U-phase coil 21a, a V-phase coil 21b, and a W-phase coil 21c.
  • the three drive signals 351 are supplied to the U-phase coil 21a, the V-phase coil 21b, and the W-phase coil 21c, respectively.
  • the sensor board 22 included in the main body 2 includes, for example, three sensors 220. Each sensor 220 detects the rotational position of the motor 21. The three sensors 220 are arranged at intervals of 120 degrees along the rotation direction of the motor 21, for example.
  • the output signal (in other words, the position detection signal) 230 of each sensor 220 is supplied to the connector 24.
  • the three output signals 230 supplied to the connector 24 are supplied to the control circuit 34 through the connector 37 of the connection cable 4 and the power supply device 3.
  • the connection cable 4 includes three signal lines 40d that transmit the output signals 230 of the three sensors 220 from the main body 2 to the power supply device 3, respectively.
  • the output signal 230 of the sensor 220 may be referred to as a sensor signal 230.
  • the control circuit 34 includes, for example, a microprocessor 341 and a DC-DC converter 340.
  • the DC-DC converter 340 steps down the DC voltage supplied from the AC-DC converter 330 and outputs the DC voltage. It can be said that the DC-DC converter 340 is a step-down circuit.
  • the DC-DC converter 340 produces a power source for the microcomputer 341. Further, the DC-DC converter 340 generates a power source for the sensor 220 on the sensor board 22.
  • the power supply of the sensor 220 generated by the DC-DC converter 340 is supplied to each sensor 220 through the connector 37, the connection cable 4, and the connector 24.
  • connection cable 4 includes a signal line 40b that transmits the positive power supply for the sensor 220 from the power supply device 3 to the main body 2, and a signal line 40c that transmits the negative power supply for the sensor 220 from the power supply device 3 to the main body 2.
  • the connection cable 4 includes eight signal lines.
  • the microprocessor 341 controls the rotation of the motor 21 by controlling the inverter 35 based on the three sensor signals 230 from the sensor board 22. Specifically, the microcomputer 341 controls the voltage of the control terminal of each switching element 350 of the inverter 35 based on the three sensor signals 230 to control the on / off state of each switching element 350. As a result, an appropriate drive signal 351 is supplied from the inverter 35 to each of the U-phase coil 21a, the V-phase coil 21b, and the W-phase coil 21c of the motor 21, and the rotation of the motor 21 is controlled.
  • the microcomputer 341 generates six control signals 342, and supplies the generated six control signals 342 to the control terminals of the six switching elements 350, respectively.
  • the control circuit 34 may include a hardware circuit that does not require software to realize the function, instead of the microcomputer 341 that requires software to realize the function.
  • a power supply device 3 including an inverter 35, a control circuit 34, and a power supply unit 33 is provided in addition to the main body 2.
  • the power supply device 3 can be shared among the plurality of main bodies 2.
  • the power supply device 3 can be shared between the main bodies 2 of a plurality of disc grinders.
  • the power supply device 3 can be shared between the main bodies 2 of the plurality of types of power tools 1. For example, it can be shared between the main body 2 of a disc grinder, an impact driver, a drill driver, a circular saw, a reciprocating saw and a polisher.
  • the power supply device 3 can be connected to each of the disc grinder, the impact driver, the drill driver, the circular saw, the reciprocating saw, and the main body 2 of the polisher. Therefore, it is not necessary to separately provide the inverter 35, the control circuit 34, and the power supply unit 33 for each power tool 1, so that the cost of the power tool 1 can be reduced.
  • the inverter 35, the control circuit 34, and the power supply unit 33 are provided separately from the main body 2, the size of the main body 2 can be reduced. Alternatively, the weight of the main body 2 can be reduced. Therefore, the user can easily work by holding the main body 2.
  • FIG. 3 is a diagram schematically showing a configuration example of a power tool 100 including a main body 2 having an inverter 35, a control circuit 34, and a power supply unit 33.
  • the circuit board 31 is housed in the housing 20 of the main body 2. Further, the housing 20 is not provided with the connector 24, and the two signal lines 50a of the connection cable 5 are directly connected to the substrate 32. Comparing the power tool 100 of FIG. 3 and the power tool 1 of FIG. 1, the length of the housing 20 gripped by the user is shorter in the power tool 1 than in the power tool 100. Further, the main body 2 of the power tool 1 is lighter than the main body 2 of the power tool 100.
  • connection cable 5 When the connection cable 5 is detachable from the power supply device 3 as in this example, the connection cable 5 can be easily replaced. Further, the length of the connection cable 5 can be easily changed by preparing a plurality of types of connection cables 5 having different lengths. Further, since the power tool 1 can be stored in the case with the connection cable 5 removed from the power supply device 3, the user can easily carry the power tool 1.
  • connection cable 4 when the connection cable 4 is detachable from the main body 2 and the power supply device 3 as in this example, the connection cable 4 can be easily replaced. Further, the length of the connection cable 4 can be easily changed by preparing a plurality of types of connection cables 4 having different lengths. Further, since the power tool 1 can be stored in the case with the connection cable 4 removed from the main body 2 and the power supply device 3, the user can easily carry the power tool 1.
  • the power supply unit 33, the control circuit 34, and the inverter 35 are mounted on one board 32, but at least two of the power supply unit 33, the control circuit 34, and the inverter 35 are mounted on different boards. May be done.
  • FIG. 4 is a diagram showing a configuration example of a power tool 1 including a main body 2 having an inverter 35.
  • FIG. 5 is a diagram mainly showing an example of a circuit configuration of a power tool 1 including a main body 2 having an inverter 35. INV shown in FIG. 4 means an inverter.
  • the power tool 1 including the main body 2 having the inverter 35 may be particularly referred to as a power tool 1A.
  • the DC voltage generated by the AC-DC converter 330 is supplied to the connector 37. Further, the six control signals 342 generated by the control circuit 34 are supplied to the connector 37.
  • connection cable 4 included in the power tool 1A includes 13 signal lines. Specifically, the connection cable 4 includes the above-mentioned signal lines 40b and 40c, the above-mentioned three signal lines 40d, the above-mentioned signal lines 40e and 40f, and six signal lines 40g.
  • the signal line 40e transmits the positive potential of the DC voltage generated by the AC-DC converter 330 from the power supply device 3 to the main body 2.
  • the positive potential transmitted by the signal line 40e is supplied to the inverter 35 as a positive power source through the connector 24 of the main body 2.
  • the signal line 40f transmits the ground potential of the DC voltage generated by the AC-DC converter 330 from the power supply device 3 to the main body 2.
  • the ground potential transmitted by the signal line 40f is supplied to the inverter 35 as a negative power source through the connector 24.
  • the six signal lines 40g transmit the six control signals 342 generated by the control circuit 34 from the power supply device 3 to the main body 2, respectively.
  • the control signal transmitted by the signal line 40g is supplied to the control terminal of the switching element 350 of the inverter 35 through the connector 24.
  • the on / off state of the switching element 350 is controlled by a control signal.
  • the length of the housing 20 gripped by the user is shorter in the power tool 1A than in the power tool 100. Further, the main body 2 of the power tool 1A is lighter than the main body 2 of the power tool 100. Therefore, the user can easily work by holding the main body 2 of the power tool 1A in his hand.
  • the control circuit 34 may be provided in the main body 2 instead of the power supply device 3.
  • FIG. 6 is a diagram showing a configuration example of a power tool 1 including a main body 2 having a control circuit 34.
  • FIG. 7 is a diagram mainly showing an example of a circuit configuration of a power tool 1 including a main body 2 having a control circuit 34.
  • the power tool 1 including the main body 2 having the control circuit 34 may be referred to as a power tool 1B.
  • the connection cable 4 included in the power tool 1B includes 11 signal lines.
  • the connection cable 4 includes the above-mentioned three signal lines 40a, the above-mentioned signal lines 40e and 40f, and six signal lines 40h.
  • the DC voltage (in other words, the positive potential and the ground potential) transmitted by the signal lines 40e and 40f is supplied to the DC-DC converter 340 of the control circuit 34 through the connector 24.
  • Six control signals 342 output from the control circuit 34 are supplied to the connector 24.
  • the six signal lines 40h transmit the six control signals 342 supplied to the connector 24 from the main body 2 to the power supply device 3, respectively.
  • the length of the housing 20 gripped by the user is shorter in the power tool 1B than in the power tool 100. Further, the main body 2 of the power tool 1B is lighter than the main body 2 of the power tool 100. Therefore, the user can easily work by holding the main body 2 of the power tool 1B in his hand.
  • the number of signal lines of the connection cable 4 is the smallest for the power tool 1, the second smallest for the power tool 1B, and the largest for the power tool 1A. Therefore, after the connection cable 4 provided by the power tools 1, 1A and 1B, the connection cable 4 provided by the power tool 1 has the lowest possibility of disconnection.
  • connection cable 5 of the power supply device 300 with a cable is detachable from the power supply device 3, but may be fixed to the power supply device 3 so as not to be detachable.
  • the two signal lines 50a of the connection cable 5 may be directly connected to the board 32 without providing the connectors 38 and 51 on the power supply device 3 and the connection cable 5, respectively.
  • connection cable 4 may be fixed to the power supply device 3 so as not to be detachable.
  • each signal line of the connection cable 4 may be directly connected to the substrate 32 without providing the connectors 37 and 42 to the power supply device 3 and the connection cable 4, respectively.
  • connection cable 4 may be fixed to the main body 2 so as not to be detachable. In this case, each signal line of the connection cable 4 may be pulled into the housing 20 of the main body 2 without providing the connectors 24 and 41 on the main body 2 and the connection cable 4, respectively.
  • the power supply device 3 provided with the inverter 35 may be provided with a cooling fan for cooling the inverter 35.
  • the inverter 35 can be cooled by the cooling fan 23 of the main body 2.
  • the main body 2 includes the sensor board 22, but the sensor board 22 may not be provided.
  • the control circuit 34 may detect, for example, the current flowing through the motor 21 and determine the rotation position of the motor 21 based on the detection result. Further, the control circuit 34 may detect, for example, the induced voltage generated by the motor 21 and obtain the rotation position of the motor 21 based on the detection result.
  • the configuration of the connection cable 4 includes the signal lines 40b and 40c for transmitting the power supply for the sensor 220 from the power supply device 3 to the main body 2 and the output signal 230 of the sensor 220.
  • the configuration may not include the three signal lines 40d transmitted from 2 to the power supply device 3. As a result, the number of required signal lines is reduced, so that the cost of the power tool 1 can be reduced.
  • FIG. 8 is a diagram showing a configuration example of a power tool 1 in which the power supply device 3 can be attached to and detached from the main body 2. In FIG. 8, the description of a part of the configurations in the housings 20 and 30 is omitted.
  • the housing 30 of the power supply device 3 is removable from the housing 20 of the main body 2.
  • a connection terminal group 39 composed of a plurality of connection terminals is provided. Each connection terminal of the connection terminal group 39 is exposed from the housing 30.
  • a connection terminal group 27 composed of a plurality of connection terminals is provided. Each connection terminal of the connection terminal group 27 is exposed from the housing 20.
  • the control circuit 34 In the power tool 1 provided with the power supply unit 33, the control circuit 34, and the inverter 35 in the power supply device 3, when the housing 30 is mounted on the housing 20, the control circuit 34 is electrically connected to the sensor substrate 22 as in FIG. The inverter 35 is electrically connected to the motor 21. Further, in the power tool 1A, when the housing 30 is mounted on the housing 20, the control circuit 34 of the power supply device 3 is electrically connected to the inverter 35 and the sensor board 22 of the main body 2 as in FIG. The DC voltage output from the AC-DC converter 330 of the power supply device 3 is supplied to the inverter 35 of the main body 2.
  • the inverter 35 of the power supply device 3 is electrically connected to the motor 21 and the control circuit 34 of the main body 2 as in FIG. 7, and the power supply device
  • the DC voltage output from the AC-DC converter 330 of 3 is supplied to the control circuit 34 of the main body 2.
  • the power supply device 3 can be shared among the plurality of main bodies 2. The cost of the power tool 1 can be reduced.
  • the power supply unit 33 of the power supply device 3 includes an AC-DC converter 330, but a battery may be provided instead of the AC-DC converter 330.
  • FIG. 9 is a diagram showing a configuration example of the power tool 1 in which the power supply unit 33 includes the battery 335.
  • the description of all the configurations in the housing 20 is omitted, and the description of a part of the configurations in the housing 30 is omitted.
  • the connection cable 5 becomes unnecessary.
  • the battery 335 may be rechargeable by a charger separate from the power tool 1. In this case, a charging terminal for charging the battery 335 is provided in the housing 30 of the power supply device 3 so as to be exposed from the housing 30.
  • the charging voltage from the charger is supplied to the charging terminal, and the battery 335 is charged.
  • the DC voltage output from the battery 335 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34 instead of the DC voltage generated by the AC-DC converter 330.
  • the power supply device 3 can be shared among the plurality of main bodies 2, so that the cost of the power tool 1 can be reduced.
  • the main body 2 can be made smaller or lighter.
  • the main body 2 and the power supply device 3 are connected by the connection cable 4, but as shown in FIG. 10, the power supply of the power tool 1 in which the housing 30 is detachable from the housing 20.
  • the unit 33 may include a battery 335.
  • FIG. 10 the description of a part of the configurations in the housings 20 and 30 is omitted.
  • the main body 2 is provided with the connector 24 and the connection terminal group 27, the power supply device 3 is provided with the connector 37 and the connection terminal group 39, and the main body 2 and the power supply device 3 can be connected by the connection cable 4.
  • the housing 30 of the power supply device 3 may be attached to and detached from the housing 20 of the main body 2.
  • 11 and 12 are diagrams showing a configuration example of the power tool 1 in this case.
  • FIG. 11 shows a power tool 1 in which the main body 2 and the power supply device 3 are connected by a connection cable 4.
  • FIG. 12 shows a power tool 1 in which the housing 30 of the power supply device 3 is attached to the housing 20 of the main body 2. In FIGS. 11 and 12, the description of a part of the configuration in the housings 20 and 30 is omitted.
  • 11 and 12 show the power tool 1 not provided with the connection cable 5, but in the power tool 1 provided with the connection cable 5, the main body 2 is provided with the connector 24 and the connection terminal group 27, and the power supply device 3 is provided with the connector 24 and the connection terminal group 27.
  • the connector 37 and the connection terminal group 39 may be provided so that the main body 2 and the power supply device 3 can be connected by the connection cable 4, and the housing 30 can be attached to and detached from the housing 20.
  • FIG. 13 is a diagram mainly showing a configuration example of a power supply unit 33 including an AC-DC converter 330 and a booster circuit 336.
  • the booster circuit 336 boosts and outputs the DC voltage output from the AC-DC converter 330.
  • the booster circuit 336 boosts the DC voltage output from the AC-DC converter 330, for example, several times.
  • the DC voltage output from the booster circuit 336 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.
  • FIG. 14 is a diagram mainly showing another configuration example of the power supply unit 33 including the AC-DC converter 330 and the booster circuit 336.
  • the booster circuit 336 boosts and outputs the AC voltage supplied to the connector 52. Then, the AC voltage output from the booster circuit 336 is converted into a DC voltage by the AC-DC converter 330.
  • the DC voltage generated by the AC-DC converter 330 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.
  • the power supply unit 33 is provided with the booster circuit 336, so that a high voltage can be supplied to the inverter 35. As a result, a high voltage can be supplied to the motor 21. Therefore, the current flowing through the inverter 35 and the motor 21 can be reduced. As a result, heat generation of the inverter 35 and the motor 21 can be suppressed.
  • the power supply unit 33 may include a battery 335 and a booster circuit 336 as shown in FIG.
  • the booster circuit 336 boosts the output voltage of the battery 335 and outputs it.
  • the DC voltage output from the booster circuit 336 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

A power supply device (3). The power supply device (3) is to be connected to an electric tool body (2) that comprises a brushless DC motor (21). The power supply device (3) comprises: at least one of an inverter (35) that drives the brushless DC motor (21) and a control circuit (34) that controls the inverter (35); and a power supply unit (33) that supplies power to the inverter (35).

Description

電源装置、ケーブル付き電源装置及び電動工具Power supply, power supply with cable and power tools 関連出願の相互参照Cross-reference of related applications
　本出願は、日本国出願２０１９－１６８５４５号（２０１９年９月１７日出願）の優先権を主張するものであり、当該出願の開示全体を、ここに参照のために取り込む。 This application claims the priority of Japanese application No. 2019-168545 (filed on September 17, 2019), and the entire disclosure of the application is incorporated herein by reference.
　本開示は、電動工具に関する。 This disclosure relates to power tools.
　特許文献１には、電動工具に関する技術が記載されている。 Patent Document 1 describes a technique related to a power tool.
特開２０１８－１０３３１８号公報Japanese Unexamined Patent Publication No. 2018-10313
　電源装置、ケーブル付き電源装置及び電動工具が開示される。一の実施の形態では、電源装置は、ブラシレスＤＣモータを備える電動工具本体に接続される電源装置である。電源装置は、ブラシレスＤＣモータを駆動するインバータとインバータを制御する制御回路の少なくとも一方と、インバータに電源を供給する電源部とを備える。 A power supply device, a power supply device with a cable, and a power tool are disclosed. In one embodiment, the power supply is a power supply connected to a power tool body comprising a brushless DC motor. The power supply device includes at least one of an inverter for driving a brushless DC motor and a control circuit for controlling the inverter, and a power supply unit for supplying power to the inverter.
　また、一の実施の形態では、ケーブル付き電源装置は、上記の電源装置と、電源装置と電動工具本体との間を接続する接続ケーブルとを備える。 Further, in one embodiment, the power supply device with a cable includes the above power supply device and a connection cable for connecting the power supply device and the power tool main body.
　また、一の実施の形態では、電動工具は、上記の電源装置と、電源装置が接続される、ブラシレスＤＣモータを備える電動工具本体とを備える。 Further, in one embodiment, the power tool includes the above power supply device and a power tool main body including a brushless DC motor to which the power supply device is connected.
電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の回路構成例を主に示す図である。It is a figure which mainly shows the circuit configuration example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の回路構成例を主に示す図である。It is a figure which mainly shows the circuit configuration example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の回路構成例を主に示す図である。It is a figure which mainly shows the circuit configuration example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電動工具の構成例を示す図である。It is a figure which shows the structural example of a power tool. 電源部の構成例を示す図である。It is a figure which shows the configuration example of the power-source part. 電源部の構成例を示す図である。It is a figure which shows the configuration example of the power-source part. 電源部の構成例を示す図である。It is a figure which shows the configuration example of the power-source part.
　図１は電動工具１の構成例を模式的に示す図である。図１に示されるように、電動工具１は、電動工具本体２と、電源装置３と、接続ケーブル４と、接続ケーブル５とを備える。図１に示される電動工具１は、例えば、手持ちのディスクグラインダである。電動工具１は、ディスクグラインダ以外の手持ちの電動工具であってもよい。例えば、電動工具１は、インパクトドライバであってもよいし、ドライバドリルであってもよいし、丸鋸であってもよいし、レシプロソーであってもよいし、ポリッシャーであってもよい。以後、電動工具本体２を単に本体２と呼ぶことがある。 FIG. 1 is a diagram schematically showing a configuration example of the power tool 1. As shown in FIG. 1, the power tool 1 includes a power tool main body 2, a power supply device 3, a connection cable 4, and a connection cable 5. The power tool 1 shown in FIG. 1 is, for example, a hand-held disc grinder. The power tool 1 may be a hand-held power tool other than the disc grinder. For example, the power tool 1 may be an impact driver, a driver drill, a circular saw, a reciprocating saw, or a polisher. Hereinafter, the power tool main body 2 may be simply referred to as a main body 2.
　本体２は、複数の部品を収容し、ユーザによって把持されるハウジング２０を備える。ハウジング２０には、ブラシレスＤＣモータ２１、センサ基板２２、冷却ファン２３及びコネクタ２４等が収容されている。 The main body 2 includes a housing 20 that accommodates a plurality of parts and is gripped by a user. The housing 20 houses a brushless DC motor 21, a sensor board 22, a cooling fan 23, a connector 24, and the like.
　また本体２は、ブラシレスＤＣモータ２１によって駆動される駆動部を備える。駆動部には、例えば、ハウジング２０内に収容されたギア部と、ハウジング２０から露出する円板状の砥石２５とが含まれる。ギア部は、ブラシレスＤＣモータ２１の回転を、その回転速度を低減して砥石２５に伝達する。ブラシレスＤＣモータ２１は、ギア部を介して砥石２５を回転させることが可能である。電動工具１は、砥石２５を回転させることによって、研削、切断及び研磨等を行うことが可能である。ブラシレスＤＣモータ２１は電源装置３によって駆動される。 The main body 2 also includes a drive unit driven by a brushless DC motor 21. The drive unit includes, for example, a gear unit housed in the housing 20 and a disc-shaped grindstone 25 exposed from the housing 20. The gear portion transmits the rotation of the brushless DC motor 21 to the grindstone 25 by reducing its rotation speed. The brushless DC motor 21 can rotate the grindstone 25 via the gear portion. The power tool 1 can perform grinding, cutting, polishing, and the like by rotating the grindstone 25. The brushless DC motor 21 is driven by the power supply device 3.
　センサ基板２２は、ブラシレスＤＣモータ２１の回転位置を検出することが可能である。より具体的には、センサ基板２２は、ブラシレスＤＣモータ２１が備えるロータの回転位置を検出することが可能である。冷却ファン２３は、ブラシレスＤＣモータ２１の回転軸２１０に接続されている。冷却ファン２３は、回転軸２１０が回転することによって回転する。冷却ファン２３が回転すると、ハウジング２０の後方に設けられた吸気口から空気がハウジング２０内に取り入れられる。吸気口から取り入れられた空気は、ハウジング２０内のブラシレスＤＣモータ２１等を冷却して、その後、ハウジング２０の前方に設けられた排気口からハウジング２０外に排出される。コネクタ２４は部分的にハウジング２０から露出しており、コネクタ２４には接続ケーブル４が接続される。コネクタ２４は、接続ケーブル４が接続される接続箇所であると言える。以後、ブラシレスＤＣモータ２１を単にモータ２１と呼ぶことがある。 The sensor board 22 can detect the rotational position of the brushless DC motor 21. More specifically, the sensor substrate 22 can detect the rotational position of the rotor included in the brushless DC motor 21. The cooling fan 23 is connected to the rotating shaft 210 of the brushless DC motor 21. The cooling fan 23 rotates as the rotating shaft 210 rotates. When the cooling fan 23 rotates, air is taken into the housing 20 from the intake port provided at the rear of the housing 20. The air taken in from the intake port cools the brushless DC motor 21 and the like in the housing 20, and then is discharged to the outside of the housing 20 from the exhaust port provided in front of the housing 20. The connector 24 is partially exposed from the housing 20, and the connection cable 4 is connected to the connector 24. It can be said that the connector 24 is a connection point to which the connection cable 4 is connected. Hereinafter, the brushless DC motor 21 may be simply referred to as a motor 21.
　電源装置３は、本体２とは別体の装置であって、複数の部品を収容するハウジング３０を備える。ハウジング３０には、回路基板３１、コネクタ３７及びコネクタ３８が収容されている。 The power supply device 3 is a device separate from the main body 2 and includes a housing 30 for accommodating a plurality of parts. The housing 30 houses the circuit board 31, the connector 37, and the connector 38.
　回路基板３１は、基板３２と、当該基板３２上に搭載された電源部３３、制御回路３４及びインバータ３５とを備える。電源部３３は、インバータ３５に電源を供給することが可能である。電源部３３は、例えば、商用電源から供給される交流電圧を直流電圧に変換し、生成した直流電圧をインバータ３５に供給する。電源部３３は電源回路とも言える。インバータ３５は、本体２が備えるモータ２１を駆動することが可能である。制御回路３４はインバータ３５を制御することが可能である。 The circuit board 31 includes a board 32, a power supply unit 33 mounted on the board 32, a control circuit 34, and an inverter 35. The power supply unit 33 can supply power to the inverter 35. The power supply unit 33 converts, for example, an AC voltage supplied from a commercial power source into a DC voltage, and supplies the generated DC voltage to the inverter 35. The power supply unit 33 can be said to be a power supply circuit. The inverter 35 can drive the motor 21 included in the main body 2. The control circuit 34 can control the inverter 35.
　コネクタ３７は部分的にハウジング３０から露出している。コネクタ３７には接続ケーブル４が接続される。コネクタ３７は、接続ケーブル４が接続される接続箇所であると言える。接続ケーブル４は、電源装置３のハウジング３０から、本体２のハウジング２０まで延びている。接続ケーブル４の長さは、例えば数十ｃｍ～数ｍである。接続ケーブル４の長さはこの限りではない。 The connector 37 is partially exposed from the housing 30. The connection cable 4 is connected to the connector 37. It can be said that the connector 37 is a connection point to which the connection cable 4 is connected. The connection cable 4 extends from the housing 30 of the power supply device 3 to the housing 20 of the main body 2. The length of the connection cable 4 is, for example, several tens of cm to several m. The length of the connection cable 4 is not limited to this.
　コネクタ３８は部分的にハウジング３０から露出している。コネクタ３８には接続ケーブル５が接続される。コネクタ３８は、接続ケーブル５が接続される接続箇所であると言える。 The connector 38 is partially exposed from the housing 30. The connection cable 5 is connected to the connector 38. It can be said that the connector 38 is a connection point to which the connection cable 5 is connected.
　接続ケーブル４の一方の端部には、本体２のコネクタ２４に接続されるコネクタ４１が設けられている。接続ケーブル４の他方の端部には、電源装置３のコネクタ３７に接続されるコネクタ４２が設けられている。接続ケーブル５の一方の端部には、電源装置３のコネクタ３８に接続されるコネクタ５１が設けられている。接続ケーブル５の他方の端部には、商用電源からの交流電圧を供給するコンセントに接続されるコネクタ５２が設けられている。コネクタ５２は電源プラグと呼ばれることがある。 At one end of the connection cable 4, a connector 41 connected to the connector 24 of the main body 2 is provided. At the other end of the connection cable 4, a connector 42 connected to the connector 37 of the power supply device 3 is provided. At one end of the connection cable 5, a connector 51 connected to the connector 38 of the power supply device 3 is provided. At the other end of the connection cable 5, a connector 52 connected to an outlet that supplies an AC voltage from a commercial power source is provided. The connector 52 is sometimes called a power plug.
　本例では、接続ケーブル４の一方の端部は本体２に着脱可能である。具体的には、接続ケーブル４のコネクタ４１は、本体２のコネクタ２４に対して着脱可能である。また、接続ケーブル４の他方の端部は電源装置３に対して着脱可能である。具体的には、接続ケーブル４のコネクタ４２は、ハウジング３０内のコネクタ３７に対して着脱可能である。 In this example, one end of the connection cable 4 can be attached to and detached from the main body 2. Specifically, the connector 41 of the connection cable 4 is removable from the connector 24 of the main body 2. Further, the other end of the connection cable 4 is detachable from the power supply device 3. Specifically, the connector 42 of the connection cable 4 is removable from the connector 37 in the housing 30.
　また、本例では、接続ケーブル５の一方の端部は電源装置３に対して着脱可能である。具体的には、接続ケーブル５のコネクタ５１は、ハウジング３０内のコネクタ３８に対して着脱可能である。また、接続ケーブル５のコネクタ５２はコンセントに対して着脱可能である。電動工具１は、電源装置３と接続ケーブル４及び５とを備えるケーブル付き電源装置３００を備えていると言える。 Further, in this example, one end of the connection cable 5 is detachable from the power supply device 3. Specifically, the connector 51 of the connection cable 5 is removable from the connector 38 in the housing 30. Further, the connector 52 of the connection cable 5 is removable from the outlet. It can be said that the power tool 1 includes a power supply device 300 with a cable including a power supply device 3 and connection cables 4 and 5.
　図２は、電動工具１の回路構成の一例を主に示す図である。図２に示されるように、接続ケーブル５のコネクタ５２には、商用電源からの単相の交流電圧が供給される。交流電圧は、接続ケーブル５を通じて、電源装置３のコネクタ３８に供給される。接続ケーブル５は２本の信号線５０ａを有している。コネクタ３８には、例えば、実効値１００Ｖの交流電圧が供給される。 FIG. 2 is a diagram mainly showing an example of the circuit configuration of the power tool 1. As shown in FIG. 2, a single-phase AC voltage from a commercial power source is supplied to the connector 52 of the connection cable 5. The AC voltage is supplied to the connector 38 of the power supply device 3 through the connection cable 5. The connection cable 5 has two signal lines 50a. For example, an AC voltage having an effective value of 100 V is supplied to the connector 38.
　コネクタ３８に供給された交流電圧は電源部３３に供給される。電源部３３はＡＣ－ＤＣコンバータ３３０を備える。ＡＣ－ＤＣコンバータ３３０は、交流電圧を直流電圧に変換して出力する。ＡＣ－ＤＣコンバータ３３０は、例えば整流回路で構成されており、ダイオード及びコンデンサを有する。ＡＣ－ＤＣコンバータ３３０は、例えば１４０Ｖ程度の直流電圧を出力する。ＡＣ－ＤＣコンバータ３３０が出力する直流電圧は制御回路３４に供給される。また、ＡＣ－ＤＣコンバータ３３０が出力する直流電圧は、インバータ３５に電源として供給される。 The AC voltage supplied to the connector 38 is supplied to the power supply unit 33. The power supply unit 33 includes an AC-DC converter 330. The AC-DC converter 330 converts an AC voltage into a DC voltage and outputs it. The AC-DC converter 330 is composed of, for example, a rectifier circuit, and has a diode and a capacitor. The AC-DC converter 330 outputs a DC voltage of, for example, about 140V. The DC voltage output by the AC-DC converter 330 is supplied to the control circuit 34. Further, the DC voltage output by the AC-DC converter 330 is supplied to the inverter 35 as a power source.
　インバータ３５は、例えば６個のスイッチング素子３５０を備える。スイッチング素子３５０は例えばＦＥＴ（Field effect transistor）である。スイッチング素子３５０はＩＧＢＴ（Insulated Gate Bipolar Transistor）であってもよいし、他の素子であってもよい。インバータ３５では、直列接続された２個のスイッチング素子３５０から成るスイッチング回路が３個並列に接続されている。各スイッチング回路において、２個のスイッチング素子の接続点の電圧が駆動信号３５１としてモータ２１に供給される。 The inverter 35 includes, for example, six switching elements 350. The switching element 350 is, for example, a FET (Field effect transistor). The switching element 350 may be an IGBT (Insulated Gate Bipolar Transistor) or another element. In the inverter 35, three switching circuits including two switching elements 350 connected in series are connected in parallel. In each switching circuit, the voltage at the connection point of the two switching elements is supplied to the motor 21 as a drive signal 351.
　インバータ３５で生成される３個の駆動信号３５１は、電源装置３のコネクタ３７、接続ケーブル４及び本体２のコネクタ２４を通じて、モータ２１に供給される。接続ケーブル４は、３個の駆動信号３５１を電源装置３から本体２にそれぞれ伝達する３本の信号線４０ａを備える。モータ２１は、例えば三相モータであって、Ｕ相コイル２１ａ、Ｖ相コイル２１ｂ及びＷ相コイル２１ｃを備える。３個の駆動信号３５１は、Ｕ相コイル２１ａ、Ｖ相コイル２１ｂ及びＷ相コイル２１ｃにそれぞれ供給される。 The three drive signals 351 generated by the inverter 35 are supplied to the motor 21 through the connector 37 of the power supply device 3, the connection cable 4, and the connector 24 of the main body 2. The connection cable 4 includes three signal lines 40a for transmitting the three drive signals 351 from the power supply device 3 to the main body 2. The motor 21 is, for example, a three-phase motor, and includes a U-phase coil 21a, a V-phase coil 21b, and a W-phase coil 21c. The three drive signals 351 are supplied to the U-phase coil 21a, the V-phase coil 21b, and the W-phase coil 21c, respectively.
　本体２が備えるセンサ基板２２は、例えば、３個のセンサ２２０を備える。各センサ２２０は、モータ２１の回転位置を検出する。３個のセンサ２２０は、例えば、モータ２１の回転方向に沿って１２０度間隔で配置されている。各センサ２２０の出力信号（言い換えれば位置検出信号）２３０はコネクタ２４に供給される。コネクタ２４に供給される３個の出力信号２３０は、接続ケーブル４及び電源装置３のコネクタ３７を通じて制御回路３４に供給される。接続ケーブル４は、３個のセンサ２２０の出力信号２３０を本体２から電源装置３にそれぞれ伝達する３本の信号線４０ｄを備えている。以後、センサ２２０の出力信号２３０をセンサ信号２３０と呼ぶことがある。 The sensor board 22 included in the main body 2 includes, for example, three sensors 220. Each sensor 220 detects the rotational position of the motor 21. The three sensors 220 are arranged at intervals of 120 degrees along the rotation direction of the motor 21, for example. The output signal (in other words, the position detection signal) 230 of each sensor 220 is supplied to the connector 24. The three output signals 230 supplied to the connector 24 are supplied to the control circuit 34 through the connector 37 of the connection cable 4 and the power supply device 3. The connection cable 4 includes three signal lines 40d that transmit the output signals 230 of the three sensors 220 from the main body 2 to the power supply device 3, respectively. Hereinafter, the output signal 230 of the sensor 220 may be referred to as a sensor signal 230.
　制御回路３４は、例えば、マイクロコンピュータ３４１及びＤＣ－ＤＣコンバータ３４０を備える。ＤＣ－ＤＣコンバータ３４０は、ＡＣ－ＤＣコンバータ３３０から供給される直流電圧を降圧して出力する。ＤＣ－ＤＣコンバータ３４０は降圧回路であると言える。ＤＣ－ＤＣコンバータ３４０は、マイクロコンピュータ３４１の電源を生成する。また、ＤＣ－ＤＣコンバータ３４０は、センサ基板２２のセンサ２２０の電源を生成する。ＤＣ－ＤＣコンバータ３４０で生成されたセンサ２２０の電源は、コネクタ３７、接続ケーブル４及びコネクタ２４を通じて、各センサ２２０を供給される。接続ケーブル４は、センサ２２０用のプラス電源を電源装置３から本体２へ伝達する信号線４０ｂと、センサ２２０用のマイナス電源を電源装置３から本体２へ伝達する信号線４０ｃとを備える。本例では、接続ケーブル４は８本の信号線を備える。 The control circuit 34 includes, for example, a microprocessor 341 and a DC-DC converter 340. The DC-DC converter 340 steps down the DC voltage supplied from the AC-DC converter 330 and outputs the DC voltage. It can be said that the DC-DC converter 340 is a step-down circuit. The DC-DC converter 340 produces a power source for the microcomputer 341. Further, the DC-DC converter 340 generates a power source for the sensor 220 on the sensor board 22. The power supply of the sensor 220 generated by the DC-DC converter 340 is supplied to each sensor 220 through the connector 37, the connection cable 4, and the connector 24. The connection cable 4 includes a signal line 40b that transmits the positive power supply for the sensor 220 from the power supply device 3 to the main body 2, and a signal line 40c that transmits the negative power supply for the sensor 220 from the power supply device 3 to the main body 2. In this example, the connection cable 4 includes eight signal lines.
　マイクロコンピュータ３４１は、センサ基板２２からの３個のセンサ信号２３０に基づいてインバータ３５を制御することによって、モータ２１の回転を制御する。具体的には、マイクロコンピュータ３４１は、３個のセンサ信号２３０に基づいて、インバータ３５の各スイッチング素子３５０の制御端子の電圧を制御して、各スイッチング素子３５０のオン／オフ状態を制御する。これにより、インバータ３５から、モータ２１のＵ相コイル２１ａ、Ｖ相コイル２１ｂ及びＷ相コイル２１ｃのそれぞれに対して適切な駆動信号３５１が供給されてモータ２１の回転が制御される。マイクロコンピュータ３４１は、６個の制御信号３４２を生成し、生成した６個の制御信号３４２を、６個のスイッチング素子３５０の制御端子にそれぞれ供給する。なお、制御回路３４は、その機能の実現にソフトウェアが必要なマイクロコンピュータ３４１の替わりに、その機能の実現にソフトウェアが不要なハードウェア回路を備えてもよい。 The microprocessor 341 controls the rotation of the motor 21 by controlling the inverter 35 based on the three sensor signals 230 from the sensor board 22. Specifically, the microcomputer 341 controls the voltage of the control terminal of each switching element 350 of the inverter 35 based on the three sensor signals 230 to control the on / off state of each switching element 350. As a result, an appropriate drive signal 351 is supplied from the inverter 35 to each of the U-phase coil 21a, the V-phase coil 21b, and the W-phase coil 21c of the motor 21, and the rotation of the motor 21 is controlled. The microcomputer 341 generates six control signals 342, and supplies the generated six control signals 342 to the control terminals of the six switching elements 350, respectively. The control circuit 34 may include a hardware circuit that does not require software to realize the function, instead of the microcomputer 341 that requires software to realize the function.
　以上のように、本例に係る電動工具１では、本体２とは別に、インバータ３５、制御回路３４及び電源部３３を備える電源装置３が設けられている。これにより、電源装置３を、複数の本体２の間で共用することができる。例えば、複数のディスクグラインダの本体２の間で電源装置３を共用することができる。また、複数種類の電動工具１の本体２の間で電源装置３を共用することができる。例えば、ディスクグラインダ、インパクトドライバ、ドリルドライバ、丸鋸、レシプロソー及びポリッシャーの本体２の間で共用することができる。この場合、電源装置３は、ディスクグラインダ、インパクトドライバ、ドリルドライバ、丸鋸、レシプロソー及びポリッシャーの本体２のそれぞれに対して接続することが可能である。よって、電動工具１ごとに、インバータ３５、制御回路３４及び電源部３３を個別に設ける必要がなくなることから、電動工具１のコストダウンを図ることができる。 As described above, in the power tool 1 according to this example, a power supply device 3 including an inverter 35, a control circuit 34, and a power supply unit 33 is provided in addition to the main body 2. As a result, the power supply device 3 can be shared among the plurality of main bodies 2. For example, the power supply device 3 can be shared between the main bodies 2 of a plurality of disc grinders. Further, the power supply device 3 can be shared between the main bodies 2 of the plurality of types of power tools 1. For example, it can be shared between the main body 2 of a disc grinder, an impact driver, a drill driver, a circular saw, a reciprocating saw and a polisher. In this case, the power supply device 3 can be connected to each of the disc grinder, the impact driver, the drill driver, the circular saw, the reciprocating saw, and the main body 2 of the polisher. Therefore, it is not necessary to separately provide the inverter 35, the control circuit 34, and the power supply unit 33 for each power tool 1, so that the cost of the power tool 1 can be reduced.
　また、本体２とは別に、インバータ３５、制御回路３４及び電源部３３が設けられていることから、本体２のサイズを小さくすることができる。あるいは、本体２を軽量化することができる。よって、ユーザは、本体２を持って作業し易くなる。 Further, since the inverter 35, the control circuit 34, and the power supply unit 33 are provided separately from the main body 2, the size of the main body 2 can be reduced. Alternatively, the weight of the main body 2 can be reduced. Therefore, the user can easily work by holding the main body 2.
　図３は、インバータ３５、制御回路３４及び電源部３３を有する本体２を備える電動工具１００の構成例を模式的に示す図である。図３の例では、本体２のハウジング２０に回路基板３１が収容されている。また、ハウジング２０にはコネクタ２４が設けられておらず、接続ケーブル５の２本の信号線５０ａが基板３２に直接接続されている。図３の電動工具１００と図１の電動工具１とを比較すると、電動工具１００よりも電動工具１の方が、ユーザによって把持されるハウジング２０の長さが短くなっている。また、電動工具１の本体２は、電動工具１００の本体２よりも軽量化される。 FIG. 3 is a diagram schematically showing a configuration example of a power tool 100 including a main body 2 having an inverter 35, a control circuit 34, and a power supply unit 33. In the example of FIG. 3, the circuit board 31 is housed in the housing 20 of the main body 2. Further, the housing 20 is not provided with the connector 24, and the two signal lines 50a of the connection cable 5 are directly connected to the substrate 32. Comparing the power tool 100 of FIG. 3 and the power tool 1 of FIG. 1, the length of the housing 20 gripped by the user is shorter in the power tool 1 than in the power tool 100. Further, the main body 2 of the power tool 1 is lighter than the main body 2 of the power tool 100.
　本例のように、接続ケーブル５が電源装置３に対して着脱可能である場合には、接続ケーブル５を簡単に交換することが可能となる。また、長さの異なる複数種類の接続ケーブル５を用意することによって、接続ケーブル５の長さを簡単に変更することができる。また、接続ケーブル５を電源装置３から外した状態で電動工具１をケースに収納することができることから、ユーザは電動工具１を運びやすくなる。 When the connection cable 5 is detachable from the power supply device 3 as in this example, the connection cable 5 can be easily replaced. Further, the length of the connection cable 5 can be easily changed by preparing a plurality of types of connection cables 5 having different lengths. Further, since the power tool 1 can be stored in the case with the connection cable 5 removed from the power supply device 3, the user can easily carry the power tool 1.
　また、本例のように、接続ケーブル４が本体２及び電源装置３に対して着脱可能である場合には、接続ケーブル４を簡単に交換することができる。また、長さの異なる複数種類の接続ケーブル４を用意することによって、接続ケーブル４の長さを簡単に変更することができる。また、接続ケーブル４を本体２及び電源装置３から外した状態で電動工具１をケースに収納することができることから、ユーザは電動工具１を運びやすくなる。 Further, when the connection cable 4 is detachable from the main body 2 and the power supply device 3 as in this example, the connection cable 4 can be easily replaced. Further, the length of the connection cable 4 can be easily changed by preparing a plurality of types of connection cables 4 having different lengths. Further, since the power tool 1 can be stored in the case with the connection cable 4 removed from the main body 2 and the power supply device 3, the user can easily carry the power tool 1.
　上記の例では、一つの基板３２に対して、電源部３３、制御回路３４及びインバータ３５が搭載されているが、電源部３３、制御回路３４及びインバータ３５の少なくとも２つは互いに異なる基板に搭載されてもよい。 In the above example, the power supply unit 33, the control circuit 34, and the inverter 35 are mounted on one board 32, but at least two of the power supply unit 33, the control circuit 34, and the inverter 35 are mounted on different boards. May be done.
　また、上記の例では、インバータ３５は、電源装置３に設けられているが、本体２に設けられてもよい。図４は、インバータ３５を有する本体２を備える電動工具１の構成例を示す図である。図５は、インバータ３５を有する本体２を備える電動工具１の回路構成の一例を主に示す図である。図４に示されるＩＮＶはインバータを意味する。インバータ３５を有する本体２を備える電動工具１を特に電動工具１Ａと呼ぶことがある。 Further, in the above example, the inverter 35 is provided in the power supply device 3, but may be provided in the main body 2. FIG. 4 is a diagram showing a configuration example of a power tool 1 including a main body 2 having an inverter 35. FIG. 5 is a diagram mainly showing an example of a circuit configuration of a power tool 1 including a main body 2 having an inverter 35. INV shown in FIG. 4 means an inverter. The power tool 1 including the main body 2 having the inverter 35 may be particularly referred to as a power tool 1A.
　図５に示されるように、電動工具１Ａでは、ＡＣ－ＤＣコンバータ３３０が生成する直流電圧はコネクタ３７に供給される。また、制御回路３４が生成する６個の制御信号３４２はコネクタ３７に供給される。 As shown in FIG. 5, in the power tool 1A, the DC voltage generated by the AC-DC converter 330 is supplied to the connector 37. Further, the six control signals 342 generated by the control circuit 34 are supplied to the connector 37.
　電動工具１Ａが備える接続ケーブル４は１３本の信号線を備える。具体的には、接続ケーブル４は、上述の信号線４０ｂ及び４０ｃと、上述の３本の信号線４０ｄと、信号線４０ｅ及び４０ｆと、６本の信号線４０ｇとを備える。 The connection cable 4 included in the power tool 1A includes 13 signal lines. Specifically, the connection cable 4 includes the above-mentioned signal lines 40b and 40c, the above-mentioned three signal lines 40d, the above-mentioned signal lines 40e and 40f, and six signal lines 40g.
　信号線４０ｅは、ＡＣ－ＤＣコンバータ３３０で生成される直流電圧のプラス電位を、電源装置３から本体２に伝達する。信号線４０ｅで伝達されるプラス電位は、本体２のコネクタ２４を通じてインバータ３５にプラス電源として供給される。信号線４０ｆは、ＡＣ－ＤＣコンバータ３３０で生成される直流電圧の接地電位を電源装置３から本体２に伝達する。信号線４０ｆで伝達される接地電位は、コネクタ２４を通じて、インバータ３５にマイナス電源として供給される。６本の信号線４０ｇは、制御回路３４で生成される６個の制御信号３４２をそれぞれ電源装置３から本体２に伝達する。信号線４０ｇで伝達される制御信号はコネクタ２４を通じてインバータ３５のスイッチング素子３５０の制御端子に供給される。スイッチング素子３５０のオン／オフ状態は制御信号によって制御される。 The signal line 40e transmits the positive potential of the DC voltage generated by the AC-DC converter 330 from the power supply device 3 to the main body 2. The positive potential transmitted by the signal line 40e is supplied to the inverter 35 as a positive power source through the connector 24 of the main body 2. The signal line 40f transmits the ground potential of the DC voltage generated by the AC-DC converter 330 from the power supply device 3 to the main body 2. The ground potential transmitted by the signal line 40f is supplied to the inverter 35 as a negative power source through the connector 24. The six signal lines 40g transmit the six control signals 342 generated by the control circuit 34 from the power supply device 3 to the main body 2, respectively. The control signal transmitted by the signal line 40g is supplied to the control terminal of the switching element 350 of the inverter 35 through the connector 24. The on / off state of the switching element 350 is controlled by a control signal.
　図３の電動工具１００と図４の電動工具１Ａとを比較すると、電動工具１００よりも電動工具１Ａの方が、ユーザによって把持されるハウジング２０の長さが短くなっている。また、電動工具１Ａの本体２は、電動工具１００の本体２よりも軽量化される。よって、ユーザは電動工具１Ａの本体２を手にもって作業し易くなる。 Comparing the power tool 100 of FIG. 3 and the power tool 1A of FIG. 4, the length of the housing 20 gripped by the user is shorter in the power tool 1A than in the power tool 100. Further, the main body 2 of the power tool 1A is lighter than the main body 2 of the power tool 100. Therefore, the user can easily work by holding the main body 2 of the power tool 1A in his hand.
　制御回路３４は、電源装置３ではなく、本体２に設けられてもよい。図６は、制御回路３４を有する本体２を備える電動工具１の構成例を示す図である。図７は、制御回路３４を有する本体２を備える電動工具１の回路構成の一例を主に示す図である。以後、制御回路３４を有する本体２を備える電動工具１を電動工具１Ｂと呼ぶことがある。 The control circuit 34 may be provided in the main body 2 instead of the power supply device 3. FIG. 6 is a diagram showing a configuration example of a power tool 1 including a main body 2 having a control circuit 34. FIG. 7 is a diagram mainly showing an example of a circuit configuration of a power tool 1 including a main body 2 having a control circuit 34. Hereinafter, the power tool 1 including the main body 2 having the control circuit 34 may be referred to as a power tool 1B.
　図７に示されるように、電動工具１Ｂが備える接続ケーブル４は１１本の信号線を備える。具体的には、接続ケーブル４は、上述の３本の信号線４０ａと、上述の信号線４０ｅ及び４０ｆと、６本の信号線４０ｈとを備える。信号線４０ｅ及び４０ｆで伝達される直流電圧（言い換えれば、プラス電位及び接地電位）は、コネクタ２４を通じて制御回路３４のＤＣ－ＤＣコンバータ３４０に供給される。コネクタ２４には、制御回路３４が出力する６個の制御信号３４２が供給される。６本の信号線４０ｈは、コネクタ２４に供給される６個の制御信号３４２を本体２から電源装置３にそれぞれ伝達する。 As shown in FIG. 7, the connection cable 4 included in the power tool 1B includes 11 signal lines. Specifically, the connection cable 4 includes the above-mentioned three signal lines 40a, the above-mentioned signal lines 40e and 40f, and six signal lines 40h. The DC voltage (in other words, the positive potential and the ground potential) transmitted by the signal lines 40e and 40f is supplied to the DC-DC converter 340 of the control circuit 34 through the connector 24. Six control signals 342 output from the control circuit 34 are supplied to the connector 24. The six signal lines 40h transmit the six control signals 342 supplied to the connector 24 from the main body 2 to the power supply device 3, respectively.
　図３の電動工具１００と図６の電動工具１Ｂとを比較すると、電動工具１００よりも電動工具１Ｂの方が、ユーザによって把持されるハウジング２０の長さが短くなっている。また、電動工具１Ｂの本体２は、電動工具１００の本体２よりも軽量化される。よって、ユーザは電動工具１Ｂの本体２を手にもって作業し易くなる。 Comparing the power tool 100 of FIG. 3 and the power tool 1B of FIG. 6, the length of the housing 20 gripped by the user is shorter in the power tool 1B than in the power tool 100. Further, the main body 2 of the power tool 1B is lighter than the main body 2 of the power tool 100. Therefore, the user can easily work by holding the main body 2 of the power tool 1B in his hand.
　電動工具１，１Ａ，１Ｂを比較すると、接続ケーブル４の信号線の本数は、電動工具１が一番少なく、次に電動工具１Ｂが少なく、そして電動工具１Ａが一番多くなっている。よって、電動工具１，１Ａ，１Ｂが備える接続ケーブル４のち、電動工具１が備える接続ケーブル４が最も断線可能性が低くなる。 Comparing the power tools 1, 1A and 1B, the number of signal lines of the connection cable 4 is the smallest for the power tool 1, the second smallest for the power tool 1B, and the largest for the power tool 1A. Therefore, after the connection cable 4 provided by the power tools 1, 1A and 1B, the connection cable 4 provided by the power tool 1 has the lowest possibility of disconnection.
　上記の例では、ケーブル付き電源装置３００の接続ケーブル５は、電源装置３に対して着脱可能であったが、電源装置３に対して着脱不能に固定されてもよい。この場合、電源装置３及び接続ケーブル５にコネクタ３８及び５１をそれぞれ設けずに、接続ケーブル５の２本の信号線５０ａを基板３２に直接接続してもよい。 In the above example, the connection cable 5 of the power supply device 300 with a cable is detachable from the power supply device 3, but may be fixed to the power supply device 3 so as not to be detachable. In this case, the two signal lines 50a of the connection cable 5 may be directly connected to the board 32 without providing the connectors 38 and 51 on the power supply device 3 and the connection cable 5, respectively.
　また、ケーブル付き電源装置３００では、接続ケーブル４が電源装置３に対して着脱不能に固定されてもよい。この場合、電源装置３及び接続ケーブル４にコネクタ３７及び４２をそれぞれ設けずに、接続ケーブル４の各信号線を基板３２に直接接続してもよい。 Further, in the power supply device 300 with a cable, the connection cable 4 may be fixed to the power supply device 3 so as not to be detachable. In this case, each signal line of the connection cable 4 may be directly connected to the substrate 32 without providing the connectors 37 and 42 to the power supply device 3 and the connection cable 4, respectively.
　また、ケーブル付き電源装置３００では、接続ケーブル４が本体２に対して着脱不能に固定されてもよい。この場合、本体２及び接続ケーブル４にコネクタ２４及び４１をそれぞれ設けずに、接続ケーブル４の各信号線を本体２のハウジング２０内に引き込んでもよい。 Further, in the power supply device 300 with a cable, the connection cable 4 may be fixed to the main body 2 so as not to be detachable. In this case, each signal line of the connection cable 4 may be pulled into the housing 20 of the main body 2 without providing the connectors 24 and 41 on the main body 2 and the connection cable 4, respectively.
　また、インバータ３５は発熱し易いことから、インバータ３５を備える電源装置３には、インバータ３５を冷却する冷却ファンを設けてもよい。なお、本体２がインバータ３５を備える場合には、本体２の冷却ファン２３によってインバータ３５を冷却することができる。 Further, since the inverter 35 easily generates heat, the power supply device 3 provided with the inverter 35 may be provided with a cooling fan for cooling the inverter 35. When the main body 2 includes the inverter 35, the inverter 35 can be cooled by the cooling fan 23 of the main body 2.
　上記の例では、本体２はセンサ基板２２を備えているが、センサ基板２２を備えていなくてもよい。この場合、制御回路３４は、例えば、モータ２１に流れる電流を検出し、その検出結果に基づいてモータ２１の回転位置を求めてもよい。また、制御回路３４は、例えば、モータ２１で発生する誘起電圧を検出し、その検出結果に基づいてモータ２１の回転位置を求めてもよい。本体２がセンサ基板２２を備えていない場合、接続ケーブル４の構成を、センサ２２０用の電源を電源装置３から本体２へ伝達するための信号線４０ｂ及び４０ｃとセンサ２２０の出力信号２３０を本体２から電源装置３に伝達する３本の信号線４０ｄとを備えない構成とすることができる。この結果、必要な信号線の数が少なくなるため、電動工具１のコストダウンを図ることができる。 In the above example, the main body 2 includes the sensor board 22, but the sensor board 22 may not be provided. In this case, the control circuit 34 may detect, for example, the current flowing through the motor 21 and determine the rotation position of the motor 21 based on the detection result. Further, the control circuit 34 may detect, for example, the induced voltage generated by the motor 21 and obtain the rotation position of the motor 21 based on the detection result. When the main body 2 does not include the sensor board 22, the configuration of the connection cable 4 includes the signal lines 40b and 40c for transmitting the power supply for the sensor 220 from the power supply device 3 to the main body 2 and the output signal 230 of the sensor 220. The configuration may not include the three signal lines 40d transmitted from 2 to the power supply device 3. As a result, the number of required signal lines is reduced, so that the cost of the power tool 1 can be reduced.
　また、上記の例では、本体２と電源装置３とを接続ケーブル４で接続しているが、電源装置３は本体２に対して直接着脱可能であってもよい。図８は、電源装置３が本体２に対して着脱可能な電動工具１の構成例を示す図である。図８ではハウジング２０及び３０内の一部の構成の記載を省略している。 Further, in the above example, the main body 2 and the power supply device 3 are connected by the connection cable 4, but the power supply device 3 may be directly attached to and detached from the main body 2. FIG. 8 is a diagram showing a configuration example of a power tool 1 in which the power supply device 3 can be attached to and detached from the main body 2. In FIG. 8, the description of a part of the configurations in the housings 20 and 30 is omitted.
　図８の例では、電源装置３のハウジング３０が本体２のハウジング２０に対して着脱可能となっている。ハウジング３０内には、コネクタ３７の替わりに、複数の接続端子から成る接続端子群３９が設けられている。接続端子群３９の各接続端子はハウジング３０から露出している。ハウジング２０内には、コネクタ２４の替わりに、複数の接続端子から成る接続端子群２７が設けられている。接続端子群２７の各接続端子はハウジング２０から露出している。ハウジング３０がハウジング２０に装着された状態では、接続端子群３９の複数の接続端子は、接続端子群２７の複数の接続端子とそれぞれ接触する。電源部３３、制御回路３４及びインバータ３５を電源装置３が備える電動工具１において、ハウジング３０がハウジング２０に装着された状態では、上述の図２と同様に、制御回路３４がセンサ基板２２と電気的に接続され、インバータ３５がモータ２１と電気的に接続される。また、電動工具１Ａにおいて、ハウジング３０がハウジング２０に装着された状態では、図５と同様に、電源装置３の制御回路３４は、本体２のインバータ３５及びセンサ基板２２と電気的に接続され、電源装置３のＡＣ－ＤＣコンバータ３３０から出力される直流電圧は、本体２のインバータ３５に供給される。また、電動工具１Ｂにおいて、ハウジング３０がハウジング２０に装着された状態では、図７と同様に、電源装置３のインバータ３５は本体２のモータ２１及び制御回路３４に電気的に接続され、電源装置３のＡＣ－ＤＣコンバータ３３０から出力される直流電圧は、本体２の制御回路３４に供給される。 In the example of FIG. 8, the housing 30 of the power supply device 3 is removable from the housing 20 of the main body 2. In the housing 30, instead of the connector 37, a connection terminal group 39 composed of a plurality of connection terminals is provided. Each connection terminal of the connection terminal group 39 is exposed from the housing 30. In the housing 20, instead of the connector 24, a connection terminal group 27 composed of a plurality of connection terminals is provided. Each connection terminal of the connection terminal group 27 is exposed from the housing 20. When the housing 30 is mounted on the housing 20, the plurality of connection terminals of the connection terminal group 39 come into contact with the plurality of connection terminals of the connection terminal group 27, respectively. In the power tool 1 provided with the power supply unit 33, the control circuit 34, and the inverter 35 in the power supply device 3, when the housing 30 is mounted on the housing 20, the control circuit 34 is electrically connected to the sensor substrate 22 as in FIG. The inverter 35 is electrically connected to the motor 21. Further, in the power tool 1A, when the housing 30 is mounted on the housing 20, the control circuit 34 of the power supply device 3 is electrically connected to the inverter 35 and the sensor board 22 of the main body 2 as in FIG. The DC voltage output from the AC-DC converter 330 of the power supply device 3 is supplied to the inverter 35 of the main body 2. Further, in the power tool 1B, when the housing 30 is mounted on the housing 20, the inverter 35 of the power supply device 3 is electrically connected to the motor 21 and the control circuit 34 of the main body 2 as in FIG. 7, and the power supply device The DC voltage output from the AC-DC converter 330 of 3 is supplied to the control circuit 34 of the main body 2.
　このように、電源装置３のハウジング３０が本体２のハウジング２０に対して着脱可能となっている場合であっても、電源装置３を、複数の本体２の間で共用することができることから、電動工具１のコストダウンを図ることができる。 As described above, even when the housing 30 of the power supply device 3 is detachable from the housing 20 of the main body 2, the power supply device 3 can be shared among the plurality of main bodies 2. The cost of the power tool 1 can be reduced.
　上記の例では、電源装置３の電源部３３は、ＡＣ－ＤＣコンバータ３３０を備えているが、ＡＣ－ＤＣコンバータ３３０の替わりにバッテリを備えてもよい。図９は、電源部３３がバッテリ３３５を備える電動工具１の構成例を示す図である。図９では、ハウジング２０内のすべての構成の記載を省略し、ハウジング３０内の一部の構成の記載を省略している。電源部３３がバッテリ３３５を備える場合には接続ケーブル５は不要となる。バッテリ３３５は、電動工具１とは別体の充電器によって充電可能とされてもよい。この場合、電源装置３のハウジング３０内にはバッテリ３３５を充電するための充電端子がハウジング３０から露出するように設けられる。そして、充電器からの充電電圧が充電端子に供給され、バッテリ３３５が充電される。バッテリ３３５から出力される直流電圧は、ＡＣ－ＤＣコンバータ３３０が生成する直流電圧の替わりに、インバータ３５及び制御回路３４のＤＣ－ＤＣコンバータ３４０に供給される。 In the above example, the power supply unit 33 of the power supply device 3 includes an AC-DC converter 330, but a battery may be provided instead of the AC-DC converter 330. FIG. 9 is a diagram showing a configuration example of the power tool 1 in which the power supply unit 33 includes the battery 335. In FIG. 9, the description of all the configurations in the housing 20 is omitted, and the description of a part of the configurations in the housing 30 is omitted. When the power supply unit 33 includes the battery 335, the connection cable 5 becomes unnecessary. The battery 335 may be rechargeable by a charger separate from the power tool 1. In this case, a charging terminal for charging the battery 335 is provided in the housing 30 of the power supply device 3 so as to be exposed from the housing 30. Then, the charging voltage from the charger is supplied to the charging terminal, and the battery 335 is charged. The DC voltage output from the battery 335 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34 instead of the DC voltage generated by the AC-DC converter 330.
　このように、電源部３３がバッテリ３３５を備える場合であっても、電源装置３を、複数の本体２の間で共用することができることから、電動工具１のコストダウンを図ることができる。また、本体２の小型化あるいは軽量化が可能となる。 As described above, even when the power supply unit 33 includes the battery 335, the power supply device 3 can be shared among the plurality of main bodies 2, so that the cost of the power tool 1 can be reduced. In addition, the main body 2 can be made smaller or lighter.
　なお、図９の例では、本体２と電源装置３が接続ケーブル４で接続されているが、図１０に示されるように、ハウジング３０がハウジング２０に対して着脱可能である電動工具１の電源部３３がバッテリ３３５を備えてもよい。図１０ではハウジング２０及び３０内の一部の構成の記載を省略している。 In the example of FIG. 9, the main body 2 and the power supply device 3 are connected by the connection cable 4, but as shown in FIG. 10, the power supply of the power tool 1 in which the housing 30 is detachable from the housing 20. The unit 33 may include a battery 335. In FIG. 10, the description of a part of the configurations in the housings 20 and 30 is omitted.
　また、本体２にコネクタ２４及び接続端子群２７を設け、電源装置３にコネクタ３７及び接続端子群３９を設けて、本体２と電源装置３を接続ケーブル４で接続することが可能であるとともに、電源装置３のハウジング３０を本体２のハウジング２０に着脱可能にしてもよい。図１１及び１２はこの場合の電動工具１の構成例を示す図である。図１１には、本体２と電源装置３が接続ケーブル４で接続された電動工具１が示されている。図１２には、電源装置３のハウジング３０が本体２のハウジング２０に対して装着された電動工具１が示されている。図１１及び１２では、ハウジング２０及び３０内の一部の構成の記載を省略している。図１１及び１２には、接続ケーブル５を備えない電動工具１が示されているが、接続ケーブル５を備える電動工具１において、本体２にコネクタ２４及び接続端子群２７を設け、電源装置３にコネクタ３７及び接続端子群３９を設けて、本体２と電源装置３を接続ケーブル４で接続することが可能であるとともに、ハウジング３０をハウジング２０に着脱可能にしてもよい。 Further, the main body 2 is provided with the connector 24 and the connection terminal group 27, the power supply device 3 is provided with the connector 37 and the connection terminal group 39, and the main body 2 and the power supply device 3 can be connected by the connection cable 4. The housing 30 of the power supply device 3 may be attached to and detached from the housing 20 of the main body 2. 11 and 12 are diagrams showing a configuration example of the power tool 1 in this case. FIG. 11 shows a power tool 1 in which the main body 2 and the power supply device 3 are connected by a connection cable 4. FIG. 12 shows a power tool 1 in which the housing 30 of the power supply device 3 is attached to the housing 20 of the main body 2. In FIGS. 11 and 12, the description of a part of the configuration in the housings 20 and 30 is omitted. 11 and 12 show the power tool 1 not provided with the connection cable 5, but in the power tool 1 provided with the connection cable 5, the main body 2 is provided with the connector 24 and the connection terminal group 27, and the power supply device 3 is provided with the connector 24 and the connection terminal group 27. The connector 37 and the connection terminal group 39 may be provided so that the main body 2 and the power supply device 3 can be connected by the connection cable 4, and the housing 30 can be attached to and detached from the housing 20.
　また、電源装置３の電源部３３は昇圧回路を備えてもよい。図１３は、ＡＣ－ＤＣコンバータ３３０及び昇圧回路３３６を備える電源部３３の構成例を主に示す図である。図１３の例では、昇圧回路３３６は、ＡＣ－ＤＣコンバータ３３０から出力される直流電圧を昇圧して出力する。昇圧回路３３６は、ＡＣ－ＤＣコンバータ３３０から出力される直流電圧を例えば数倍に昇圧する。昇圧回路３３６から出力される直流電圧は、インバータ３５及び制御回路３４のＤＣ－ＤＣコンバータ３４０に供給される。 Further, the power supply unit 33 of the power supply device 3 may be provided with a booster circuit. FIG. 13 is a diagram mainly showing a configuration example of a power supply unit 33 including an AC-DC converter 330 and a booster circuit 336. In the example of FIG. 13, the booster circuit 336 boosts and outputs the DC voltage output from the AC-DC converter 330. The booster circuit 336 boosts the DC voltage output from the AC-DC converter 330, for example, several times. The DC voltage output from the booster circuit 336 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.
　図１４は、ＡＣ－ＤＣコンバータ３３０及び昇圧回路３３６を備える電源部３３の他の構成例を主に示す図である。図１４の例では、昇圧回路３３６は、コネクタ５２に供給される交流電圧を昇圧して出力する。そして、昇圧回路３３６から出力される交流電圧はＡＣ－ＤＣコンバータ３３０で直流電圧に変換される。ＡＣ－ＤＣコンバータ３３０で生成される直流電圧は、インバータ３５及び制御回路３４のＤＣ－ＤＣコンバータ３４０に供給される。 FIG. 14 is a diagram mainly showing another configuration example of the power supply unit 33 including the AC-DC converter 330 and the booster circuit 336. In the example of FIG. 14, the booster circuit 336 boosts and outputs the AC voltage supplied to the connector 52. Then, the AC voltage output from the booster circuit 336 is converted into a DC voltage by the AC-DC converter 330. The DC voltage generated by the AC-DC converter 330 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.
　このように、電源部３３が昇圧回路３３６を備えることによって、インバータ３５に高い電圧を供給することができる。これにより、モータ２１に対して高い電圧を供給することできる。よって、インバータ３５及びモータ２１に流れる電流を低減することができる。その結果、インバータ３５及びモータ２１の発熱を抑制することができる。 In this way, the power supply unit 33 is provided with the booster circuit 336, so that a high voltage can be supplied to the inverter 35. As a result, a high voltage can be supplied to the motor 21. Therefore, the current flowing through the inverter 35 and the motor 21 can be reduced. As a result, heat generation of the inverter 35 and the motor 21 can be suppressed.
　なお、電源部３３は、図１５に示されるように、バッテリ３３５と昇圧回路３３６とを備えてもよい。この場合、昇圧回路３３６は、バッテリ３３５の出力電圧を昇圧して出力する。昇圧回路３３６から出力される直流電圧は、インバータ３５及び制御回路３４のＤＣ－ＤＣコンバータ３４０に供給される。 Note that the power supply unit 33 may include a battery 335 and a booster circuit 336 as shown in FIG. In this case, the booster circuit 336 boosts the output voltage of the battery 335 and outputs it. The DC voltage output from the booster circuit 336 is supplied to the DC-DC converter 340 of the inverter 35 and the control circuit 34.
　以上のように、電動工具は詳細に説明されたが、上記した説明は、全ての局面において例示であって、この開示がそれに限定されるものではない。また、上述した各種例は、相互に矛盾しない限り組み合わせて適用可能である。そして、例示されていない無数の例が、この開示の範囲から外れることなく想定され得るものと解される。 As described above, the power tool has been described in detail, but the above description is an example in all aspects, and this disclosure is not limited thereto. In addition, the various examples described above can be applied in combination as long as they do not contradict each other. And it is understood that innumerable examples not illustrated can be assumed without departing from the scope of this disclosure.
　１，１Ａ，１Ｂ　電動工具
　２　電動工具本体
　３　電源装置
　４　接続ケーブル
　２０　ハウジング
　２１　ブラシレスＤＣモータ
　３０　ハウジング
　３３　電源部
　３４　制御回路
　３５　インバータ
　２２０　センサ
　３００　ケーブル付き電源装置
　３３０　ＡＣ－ＤＣコンバータ
　３３５　バッテリ
　３３８　昇圧回路 1,1A, 1B Power tool 2 Power tool body 3 Power supply device 4 Connection cable 20 Housing 21 Brushless DC motor 30 Housing 33 Power supply unit 34 Control circuit 35 Inverter 220 Sensor 300 Power supply device with cable 330 AC-DC converter 335 Battery 338 Booster circuit

Claims (12)

  1. 　ブラシレスＤＣモータを備える電動工具本体に接続される電源装置であって、
    　前記ブラシレスＤＣモータを駆動するインバータと前記インバータを制御する制御回路の少なくとも一方と、
    　前記インバータに電源を供給する電源部と
    を備える、電源装置。     A power supply that is connected to a power tool body equipped with a brushless DC motor.
    At least one of the inverter that drives the brushless DC motor and the control circuit that controls the inverter,
    A power supply device including a power supply unit that supplies power to the inverter.
  2. 　請求項１に記載の電源装置であって、
    　前記インバータ及び前記制御回路を備える、電源装置。     The power supply device according to claim 1.
    A power supply device including the inverter and the control circuit.
  3. 　請求項１に記載の電源装置であって、
    　前記インバータ及び前記制御回路の一方のみを備える、電源装置。     The power supply device according to claim 1.
    A power supply device including only one of the inverter and the control circuit.
  4. 　請求項１から請求項３のいずれか一つに記載の電源装置であって、
    　前記インバータ及び前記制御回路の少なくとも一方と前記電源部を収容する第１ハウジングを備え、
    　前記電動工具本体は、前記ブラシレスＤＣモータを収容する第２ハウジングを備え、
    　前記第１ハウジングは、前記第２ハウジングに対して着脱可能である、電源装置。     The power supply device according to any one of claims 1 to 3.
    A first housing for accommodating at least one of the inverter and the control circuit and the power supply unit is provided.
    The power tool body includes a second housing that houses the brushless DC motor.
    The first housing is a power supply device that is removable from the second housing.
  5. 　請求項１から請求項４のいずれか一つに記載の電源装置であって、
    　前記電源部には、交流電圧が入力され、
    　前記電源部は、前記交流電圧を直流電圧に変換するコンバータを有する、電源装置。     The power supply device according to any one of claims 1 to 4.
    An AC voltage is input to the power supply unit.
    The power supply unit is a power supply device having a converter that converts the AC voltage into a DC voltage.
  6. 　請求項１から請求項４のいずれか一つに記載の電源装置であって、
    　前記電源部はバッテリを有する、電源装置。     The power supply device according to any one of claims 1 to 4.
    The power supply unit is a power supply device having a battery.
  7. 　請求項５及び請求項６のいずれか一つに記載の電源装置であって、
    　前記電源部は昇圧回路を有する、電源装置。     The power supply device according to any one of claims 5 and 6.
    The power supply unit is a power supply device having a booster circuit.
  8. 　請求項１から請求項７のいずれか一つに記載の電源装置と、
    　前記電源装置と前記電動工具本体との間を接続する接続ケーブルと
    を備える、ケーブル付き電源装置。     The power supply device according to any one of claims 1 to 7.
    A power supply device with a cable, comprising a connection cable for connecting the power supply device and the power tool main body.
  9. 　請求項８に記載のケーブル付き電源装置であって、
    　前記接続ケーブルは前記電源装置及び前記電動工具本体の少なくとも一方に対して着脱可能である、ケーブル付き電源装置。     The power supply device with a cable according to claim 8.
    A power supply device with a cable, wherein the connection cable can be attached to and detached from at least one of the power supply device and the power tool main body.
  10. 　請求項８及び請求項９のいずれか一つに記載のケーブル付き電源装置であって、
    　前記電源装置は前記制御回路を備え、
    　前記電動工具本体は、前記ブラシレスＤＣモータの回転位置を検出するセンサを備え、
    　前記制御回路は、前記センサの出力信号に基づいて前記インバータを制御し、
    　前記接続ケーブルは、前記センサの前記出力信号を伝達する信号線を含む、ケーブル付き電源装置。     The power supply device with a cable according to any one of claims 8 and 9.
    The power supply device includes the control circuit.
    The power tool body includes a sensor that detects the rotational position of the brushless DC motor.
    The control circuit controls the inverter based on the output signal of the sensor.
    The connection cable is a power supply device with a cable including a signal line that transmits the output signal of the sensor.
  11. 　請求項１から請求項７のいずれか一つに記載の電源装置と、
    　前記電源装置が接続される、ブラシレスＤＣモータを備える電動工具本体と
    を備える、電動工具。     The power supply device according to any one of claims 1 to 7.
    A power tool comprising a power tool body with a brushless DC motor to which the power supply is connected.
  12. 　請求項１１に記載の電動工具であって、
    　前記電源装置と前記電動工具本体とを接続する接続ケーブルをさらに備える、電動工具。     The power tool according to claim 11.
    A power tool further comprising a connection cable for connecting the power supply device and the power tool main body.
PCT/JP2020/034812 2019-09-17 2020-09-15 Power supply device, cable-equipped power supply device, and electric tool WO2021054302A1 (en)

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JP2021546661A JP7300513B2 (en) 2019-09-17 2020-09-15 Power supplies with cables and power tools
JP2023100023A JP2023123605A (en) 2019-09-17 2023-06-19 Power unit and electric tool

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203242A (en) * 1991-12-18 1993-04-20 Hansson Gunnar C Power tool for two-step tightening of screw joints
US5750932A (en) * 1992-11-09 1998-05-12 Atlas Copco Tools Ab Multi-core cable for electrically communicating a hand held power nutrunner with a power supply and control unit
JPH11297402A (en) * 1998-04-14 1999-10-29 Nippon Electric Ind Co Ltd Power source adapter for motor-driven tool
US20110248583A1 (en) * 2008-02-07 2011-10-13 Atlas Dynamic Devices, Llc Power Transmission Tool And System

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8802566L (en) * 1988-07-08 1990-01-09 Atlas Copco Tools Ab THE ENGINE OPERATED TOOL AND DRIVE SYSTEM DOES THIS
US4987806A (en) * 1989-02-13 1991-01-29 Gse, Inc. Electronic control circuitry for a nutrunner
US5315501A (en) * 1992-04-03 1994-05-24 The Stanley Works Power tool compensator for torque overshoot
SE520096C2 (en) * 1998-12-10 2003-05-27 Atlas Copco Tools Ab Power tool system including connectable and disconnectable memory module for storing and transferring data between different devices
SE519367C2 (en) * 2000-11-29 2003-02-18 Atlas Copco Tools Ab Portable tool with interchangeable module fixed with multi-contact for signaling and operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203242A (en) * 1991-12-18 1993-04-20 Hansson Gunnar C Power tool for two-step tightening of screw joints
US5750932A (en) * 1992-11-09 1998-05-12 Atlas Copco Tools Ab Multi-core cable for electrically communicating a hand held power nutrunner with a power supply and control unit
JPH11297402A (en) * 1998-04-14 1999-10-29 Nippon Electric Ind Co Ltd Power source adapter for motor-driven tool
US20110248583A1 (en) * 2008-02-07 2011-10-13 Atlas Dynamic Devices, Llc Power Transmission Tool And System

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JP2023123605A (en) 2023-09-05
JP7300513B2 (en) 2023-06-29

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