WO2013080748A1 - 機電一体型の電動駆動装置 - Google Patents

機電一体型の電動駆動装置 Download PDF

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Publication number
WO2013080748A1
WO2013080748A1 PCT/JP2012/078562 JP2012078562W WO2013080748A1 WO 2013080748 A1 WO2013080748 A1 WO 2013080748A1 JP 2012078562 W JP2012078562 W JP 2012078562W WO 2013080748 A1 WO2013080748 A1 WO 2013080748A1
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WO
WIPO (PCT)
Prior art keywords
housing
electric drive
stator
machine
stator core
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2012/078562
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English (en)
French (fr)
Japanese (ja)
Inventor
和人 大山
鈴木　康介
宮崎　英樹
勝洋 星野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to US14/360,788 priority Critical patent/US20140306563A1/en
Publication of WO2013080748A1 publication Critical patent/WO2013080748A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • 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
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • 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
    • H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/123—Suppression of common mode voltage or current

Definitions

  • the present invention relates to a machine-electric integrated electric drive apparatus in which a rotating electrical machine and a power conversion device for driving the electric machine are integrally provided.
  • Patent Document 1 discloses an example of a power conversion device provided with a common mode noise reduction mechanism. Since common mode noise (also referred to as common mode current) causes malfunction of the power conversion device that controls the rotating electrical machine, it is desirable to reduce common mode noise. For example, in a hybrid vehicle that travels based on the output of both the engine and the rotating electric machine, the common mode noise reduces the common mode noise because the common mode noise adversely affects the traveling of the vehicle based on the output of both the engine and the rotating electric machine. It is desirable to do. Further, in consideration of the mountability to a vehicle, it is preferable that the electric-power change device and the rotating electric machine be an integrated mechanical-electric type electric drive device.
  • the invention of claim 1 includes a rotor, a stator having a stator core on which an armature winding is mounted, and a rotating electrical machine provided with a housing for arranging an AC terminal of the armature winding and holding the stator, and an inverter circuit
  • a machine-electric integral type electric drive apparatus comprising: an AC bus bar connecting the inverter circuit and an AC terminal; and a power converter fixed to the outer periphery of the housing, provided in contact with the stator core
  • a current collector for collecting a common mode current caused by stray capacitance of the stator, and a connection wire for connecting a virtual neutral point on the DC input side of the inverter circuit to the current collector.
  • the common mode current can be returned from the rotating electric machine side to the virtual neutral point of the power conversion device in the machine-electric integrated type electric drive device, and the influence of the common mode current can be suppressed. .
  • FIG. 2 is a view showing a control block of a hybrid vehicle equipped with the electric drive device of the present embodiment. It is an appearance perspective view of an electric drive. It is an appearance perspective view of an electric drive.
  • FIG. 10 is a cross-sectional view of a rotary electric machine 900. It is a perspective view of stator 940 in which conductor ring 950c and conductor bar 950b were provided.
  • FIG. 2 is a view showing the inside of the power conversion device 200 in detail.
  • FIG. 2 is a diagram for explaining a circuit configuration of a power conversion device 200.
  • FIG. 8 is a diagram in which description of stator 940 is replaced with stator 940 shown in FIG.
  • FIG. 6 is a diagram for explaining a configuration of an inverter circuit 140.
  • FIG. 11 is a schematic view showing a portion of shielded cables 820U to 820W in FIG. 10 in an enlarged manner. It is a figure which shows the flow of the common mode current in the conventional electrically-driven drive device. It is a figure which shows the flow of the common mode current at the time of connecting the inverter circuit 140 and the rotary electric machine 900 with an alternating current bus-bar directly. It is a figure which shows the conductor bar 950b and the conductor ring 950c provided in the outer peripheral surface of the stator core 941.
  • FIG. 33 is a perspective view showing an example of another structure of the stator 940.
  • FIG. 17 is a cross-sectional view of stator 940 shown in FIG. It is a perspective view showing other embodiments of an electric drive.
  • FIG. 1 is a diagram showing a control block of a hybrid vehicle (hereinafter referred to as "HEV").
  • HEV hybrid vehicle traveling based on the output of both the engine and the rotating electrical machine
  • the electric drive unit of the machine-electric integrated type according to the present embodiment travels the vehicle by the rotational torque generated by the rotating electrical machine. It is also applicable to electric vehicles.
  • Engine EGN and rotating electric machine 900 generate a traveling torque of the vehicle. Furthermore, the rotary electric machine 900 not only generates rotational torque, but also has a function of converting mechanical energy externally applied to the rotary electric machine 900 into electric power.
  • the rotary electric machine 900 is, for example, a synchronous machine or an induction machine, and as described above, operates as a motor or a generator according to the operation method.
  • a permanent magnet synchronous motor using a magnet such as neodymium is suitable.
  • the permanent magnet type synchronous motor has less heat generation of the rotor as compared with the induction motor, and is also excellent for automobiles in this respect.
  • the output torque of engine EGN is transmitted to rotary electric machine 900 through power distribution mechanism TSM, and the rotational torque from power distribution mechanism TSM or the rotary torque generated by rotary electric machine 900 is transmitted to the wheels through transmission TM and differential gear DEF. It is transmitted.
  • rotational torque is transmitted from the wheels to the rotating electrical machine 900, and AC power is generated based on the supplied rotational torque.
  • the generated AC power is converted into DC power by the power conversion device 200 as described later, and charges the battery 136 for high voltage, and the charged power is again used as traveling energy.
  • the electric drive device 1 has an integrated structure of the rotary electric machine 900 and the power conversion device 200 shown in FIG.
  • the rotary electric machine 900 has a housing 912, a front bracket 908, and a rear bracket 910 as exterior parts, and they are usually made by die-casting or casting of metal typified by aluminum.
  • a front bracket 908 and a rear bracket 910 are provided at both axial ends of the housing 912 of the rotary electric machine 900, and a rotor shaft 920 protrudes from the center of the front bracket 908.
  • Power conversion device 200 is fixed to the outer peripheral surface of housing 912 which is the radial position of rotary electric machine 900.
  • the case 12 in which the circuit component which comprises the power converter device 200 is accommodated has a substantially cubic shape, and the lid 8 is fixed to the upper opening. Case 12 is fixed on a housing 912 of rotary electric machine 900.
  • the material of the case 12 is a conductive material, and in the present embodiment, it is a metal material such as aluminum die casting. Signal transmission / reception between the power conversion device 200 and a host control device provided on the vehicle side is performed via the connector 21.
  • the power terminal 509 on the positive side and the power terminal 508 on the negative side protrude from the hole 12 j provided in the case 12 of the power converter 200, and DC power from the battery 136 is supplied to these power terminals 508 and 509. Ru.
  • a flow path for flowing the refrigerant is formed in the case 12, and the refrigerant flows in from the inlet pipe 13 provided on the side wall of the case 12 and is discharged from the outlet pipe 14.
  • the electronic components such as the three-phase inverter circuit provided in the case 12 are cooled by the refrigerant.
  • the outlet pipe 14 of the case 12 is connected to an inlet pipe 913 provided in the housing 912 of the rotary electric machine 900 via the relay member 14 a.
  • the refrigerant discharged from the outlet pipe 14 flows from the inlet pipe 913 provided in the housing into a flow path (flow path 919 shown in FIG. 4 described later) in the housing. Then, the refrigerant flows in the flow path, and is discharged from the outlet pipe 914 provided on the outer periphery of the housing 912.
  • FIG. 4 is a cross-sectional view of the rotary electric machine 900.
  • the stator 940 is provided with a stator core 941 and armature windings 945 for three phases attached to the stator core 941.
  • the stator core 941 is fixed to the center bracket 909 by shrink fitting.
  • the rotor shaft 920 to which the rotor 930 is fixed is rotatably held by the front bracket 908 and the rear bracket 910 at both ends.
  • the rotor 930 is housed with a slight clearance in the radial direction so as to be rotatable in the stator 940.
  • a groove is formed on the outer periphery of the center bracket 909 so as to surround the stator core 941.
  • the center bracket 909 is housed inside the housing 912, and a channel 919 is formed by the groove of the center bracket 909 and the inner peripheral surface of the housing 912.
  • AC terminals 902U to 902W are provided to project from surface 912e of housing 912, and are connected to corresponding armature windings 945 of stator 940, respectively.
  • the housing 912 and the center bracket 909 are fixed to the front bracket 908 by bolts or the like (not shown), and the rear bracket 910 is fixed to the housing 912 by bolts or the like (not shown).
  • the exterior parts of the rotary electric machine 900 are constituted by the four parts of the housing 912, the center bracket 909, the front bracket 908, and the rear bracket 910, but it is not necessary to adhere to this configuration.
  • the housing 912 and the center bracket 909 may be one component, and there is no problem even if the front bracket 908, the housing 912 and the center bracket 909 are one component.
  • a conductive material is used as a material of the housing 912, the center bracket 909, the front bracket 908, and the rear bracket 910, and in the present embodiment, it is aluminum die cast which is a metal material.
  • FIG. 5 is a perspective view of stator 940 provided with conductor ring 950c and conductor bar 950b.
  • the stator core 941 is provided with armature windings 945 for three phases.
  • coil terminals 903U to 903W connected to AC terminals 902U to 902W are drawn out.
  • the plurality of conductor bars 950 b are arranged at predetermined intervals along one circumference of the stator core 941.
  • the stator core 941 is shrink-fitted to the inner peripheral surface of the center housing 909.
  • Each conductor bar 950 b is fixed to be in contact with the shrink-fit surface of stator core 941.
  • the stator core 941 is formed by laminating a plurality of electromagnetic steel plates punched by a die. Therefore, each conductor bar 950b is fixed to the outer peripheral surface of the stator core by welding or the like in order to make good contact with each electromagnetic steel sheet.
  • conductor bar 950b is provided to collect the common mode current (common mode noise) flowing into the stator, and the number of conductor bars 950b may be one, but the larger the number, the more the number The current collection effect is improved.
  • the common mode current flowing into the conductor bar 950b flows back into the conductor ring 950c, and is then returned to the virtual neutral point 510G on the input side of the inverter circuit by the connection wiring 700.
  • the virtual neutral point 510G is also referred to as a virtual ground point.
  • connection wiring 700 is drawn into the case 12 so as to penetrate a portion where the housing 912 and the case 12 face each other, and is not drawn out of the casing of the electric drive device 1. At the opposing portion, a through hole is formed in the bottom of case 12, and AC terminals 902 U to 902 W project into case 12.
  • connection wiring 700 may not be routed from the rotating electric machine side to the power conversion device side.
  • the housing 912 is provided with a terminal portion penetrating from inside the housing to inside the case 12;
  • the connection wire on the rotating electrical machine side may be connected to the connection wire on the power conversion device side via the terminal portion.
  • conductor bar 950b and conductor ring 950c are fixed to the outer peripheral surface of stator core 941 as members for collecting common mode current, but any structure having a function as a current collector may be used. It does not matter. For example, thick film plating may be performed on the entire outer peripheral surface of the stator core 941 and the connection wiring 700 may be connected to the plated portion.
  • the function of the current collector may be added to a part of the stator core 941 by replacing a part of the electromagnetic steel sheet constituting the stator core 941 with a conductor plate or the like.
  • a material used for the current collector for example, aluminum or copper is used.
  • FIG. 6 is a view showing the inside of the power conversion device 200 in detail, and is an external perspective view of the power conversion device 200 shown in FIG. 2 with the case 12 removed.
  • 7 to 9 are block diagrams for explaining the circuit configuration of the power conversion device 200.
  • FIGS. 7 to 9 The case 12, the housing 912, the front bracket 908 and the rear bracket 910 shown in FIG. 2 and the center bracket 909 shown in FIG. 4 are formed of an aluminum die cast or the like which is a metal material. Then, as shown in FIG. 7, the housing 912 and the case 12 are fixed to the body of the vehicle by bolts or the like, and they are electrically connected to the chassis grounds 200G and 900G on the vehicle side.
  • FIG. 8 shows the same circuit as FIG. 7, but the stator 940 part is described not by a circuit symbol but by the stator 940 shown in FIG.
  • the inverter circuit 140 is electrically connected to the battery 136 via a DC connector (not shown), and power exchange between the battery 136 and the inverter circuit 140 is performed.
  • inverter circuit 140 When operating rotary electric machine 900 as a motor, inverter circuit 140 generates AC power based on DC power supplied from battery 136, and supplies the generated AC power to rotary electric machine 900 via AC terminals 320U to 320W.
  • AC terminals 320U to 320W of power conversion device 200 are connected to AC terminals 902U to 902W of rotary electric machine 900 via metal AC bus bars 802U to 802W.
  • the rotating electrical machine 900 by operating the rotating electrical machine 900 as a motor by the power of the battery 136, it is possible to drive and drive the vehicle with only the power of the rotating electrical machine 900. Furthermore, in the present embodiment, the battery 136 can be charged by operating the rotary electric machine 900 as a generator by the power of the engine 120 or the power from the wheels.
  • the battery 136 is also used as a power source for driving a motor for the accessory.
  • the auxiliary motor include a motor that drives a compressor of an air conditioner, and a motor that drives a hydraulic pump for control.
  • the accessory power module is supplied with direct current power from the battery 136, generates alternating current power, and supplies it to the accessory motor.
  • the accessory power module has basically the same circuit configuration and function as the inverter circuit 140, and controls the phase, frequency, and power of alternating current supplied to the accessory motor.
  • Power conversion device 200 includes a capacitor 500X for smoothing DC power supplied to inverter circuit 140.
  • the power conversion device 200 is provided with a connector 21 for communication, and the connector 21 receives an instruction from the upper control device or transmits data representing a state to the upper control device.
  • the control circuit 172 of the power conversion device 200 calculates the control amount of the rotary electric machine 900 based on the command input from the connector 21, and calculates whether to operate the rotary electric machine 900 as a motor or a generator.
  • the control pulse is generated based on the calculation result and supplied to the driver circuit 174.
  • the driver circuit 174 generates a drive pulse for controlling the inverter circuit 140 based on the supplied control pulse.
  • FIG. 9 is a diagram for explaining the configuration of the inverter circuit 140.
  • an insulated gate bipolar transistor is used as a semiconductor switching element, and hereinafter abbreviated as IGBT.
  • a metal oxide semiconductor type field effect transistor (hereinafter abbreviated as a MOSFET) may be used as the switching power semiconductor element.
  • MOSFET metal oxide semiconductor type field effect transistor
  • the diode 156 and the diode 166 become unnecessary.
  • an IGBT is suitable when the DC voltage is relatively high, and a MOSFET is suitable when the DC voltage is relatively low.
  • the series circuits 150U to 150W of the upper and lower arms are constituted by the IGBTs 328U to 328W operating as the upper arm and the diodes 156U to 156W, and the IGBTs 330U to 330W operating as the lower arm and the diodes 166U to 166W.
  • the inverter circuit 140 includes the series circuit 150 corresponding to three phases of U-phase, V-phase, and W-phase of AC power to be output.
  • the series circuit 150 of the three-phase upper and lower arms outputs an alternating current from an intermediate electrode 169 which is a middle point portion of the series circuit.
  • the intermediate electrode 169 is connected to the AC terminals 902U to 902W of the rotary electric machine 900 through the AC terminals 320U to 320W.
  • AC terminals 320U to 320W and AC terminals 902U to 902W are connected by AC bus bars 802U to 802W.
  • the collector electrode 153 of the IGBT 328 of the upper arm is electrically connected to the positive electrode side capacitor terminals 506Y and 506X of the capacitor 500Y constituting the Y capacitor and the smoothing capacitor 500X via the positive electrode terminal 157.
  • the emitter electrode 154 of the lower arm IGBT 330 is electrically connected to the capacitor 500Y and the negative side capacitor terminals 504Y and 504X of the capacitor 500X through the negative electrode terminal 158.
  • the connection wiring 700 one end of which is connected to the conductor ring 950c (see FIGS. 7 and 8), is connected to a virtual neutral point 510G which is a middle point between the two capacitors 500Y via the capacitor 510Ya.
  • the capacitor 500X includes a capacitor terminal 506X on the positive side and a capacitor terminal 504Y on the negative side, and a power supply terminal 509 on the positive side and a power terminal 508 on the negative side.
  • the high voltage DC power from the battery 136 is supplied to the positive side power supply terminal 509 and the negative side power supply terminal 508, and is supplied to the inverter circuit 140 from the positive side capacitor terminal 506 and the negative side capacitor terminal 504 of the capacitor 500X. Be done.
  • DC power converted from AC power by inverter circuit 140 is supplied from capacitor terminal 506X on the positive side and capacitor terminal 504Y on the negative side to capacitor 500X, and power supply terminal 509 on the positive side and power supply terminal on the negative side.
  • the battery is supplied to the battery 136 from a direct current connector (not shown) from 508 and stored in the battery 136.
  • the control circuit 172 includes a microcomputer (hereinafter, referred to as a "microcomputer") for arithmetically processing the switching timing of the IGBTs 328 and 330.
  • a microcomputer for arithmetically processing the switching timing of the IGBTs 328 and 330.
  • As input information to the microcomputer there are a target torque value required for the rotary electric machine 900, a current value supplied from the series circuit 150 to the rotary electric machine 900, and a magnetic pole position of a rotor of the rotary electric machine 900.
  • the target torque value is based on a command signal output from a not-shown upper controller.
  • the current value is detected based on a detection signal from a current sensor (not shown) provided in power conversion device 200.
  • the magnetic pole position is detected based on a detection signal output from a rotating magnetic pole sensor (not shown) such as a resolver provided in the rotary electric machine 900.
  • the microcomputer in control circuit 172 calculates the d-axis and q-axis current command values of rotary electric machine 900 based on the target torque value, and the calculated d-axis and q-axis current command values and detected d
  • the voltage command values of d axis and q axis are calculated based on the difference between the current values of the axis and q axis, and the calculated voltage command values of d axis and q axis are calculated based on the detected magnetic pole position. Convert to voltage command value of phase, V phase and W phase.
  • the microcomputer generates a pulse-like modulated wave based on the comparison between the fundamental wave (sine wave) and the carrier wave (triangular wave) based on the voltage command values of U phase, V phase and W phase (hereinafter referred to as PWM control)
  • PWM control a pulse-like modulated wave based on the comparison between the fundamental wave (sine wave) and the carrier wave (triangular wave) based on the voltage command values of U phase, V phase and W phase
  • PWM control Pulse Width Modulation
  • the driver circuit 174 supplies drive pulses for controlling the IGBTs 328 and IGBTs 330 constituting the upper arm or lower arm of the series circuit 150 of each phase to the IGBTs 328 and IGBTs 330 of each phase based on the control pulse.
  • the driver circuit 174 When driving the lower arm, the driver circuit 174 outputs a drive signal obtained by amplifying the PWM signal to the gate electrode of the IGBT 330 of the corresponding lower arm.
  • the driver circuit 174 shifts the level of the reference potential of the PWM signal to the level of the reference potential of the upper arm, amplifies the PWM signal, and corresponds it as a drive signal. It outputs to the gate electrode of IGBT328 of an arm.
  • IGBT 328 and IGBT 330 conduct or shut off operation based on the drive pulse from driver circuit 174, convert DC power supplied from battery 136 into three-phase AC power, and supply the converted power to rotating electric machine 900. Be done.
  • the AC terminals 321U to 321W of the rotary electric machine 900 are normally shielded cables 820U to 820W as shown in FIG. It is connected to the AC terminals 902U to 902W of the rotary electric machine 900 through the same.
  • the AC output terminal of series circuit 150 and AC terminals 321U to 321W of power conversion device 200 are connected by metal bus bars, and shield cables 820U to 820W are connected to AC terminals 320U to 320W. Ru.
  • the power conversion device 200 and the rotary electric machine 900 are integrated. Therefore, as shown in FIG. 6, the end portions of the AC bus bars 802U to 802W connected to the AC terminals 320U to 320W of the series circuit 150 are directly connected to the AC terminals 902U to 902W of the rotary electric machine 900. That is, the shielded cables 820U to 820W are omitted. Above the inverter circuit 140, a driver circuit board 22 on which the driver circuit 174 is mounted and a control circuit board 20 on which the control circuit 172 is mounted are sequentially disposed.
  • An inlet pipe 13 and an outlet pipe 14 for cooling water are provided on the side surface of the case 12 of the power conversion device 200, and the cooling water passes through a cooling water passage (not shown) provided in the power conversion device 200.
  • Three-phase inverter circuit 140 and peripheral parts are cooled.
  • phase voltages of the UVW phases change as follows according to ON and OFF of the IGBTs 328 U to 328 W of the upper arm of the inverter circuit 140 and the IGBTs 330 U to 330 W of the lower arm.
  • the switching patterns of the IGBTs 328 U to 328 W in the upper arm and the IGBTs 330 U to 330 W in the lower arm of the inverter circuit 140 are the following eight modes.
  • the case of the upper arm ON and the lower arm OFF is represented as 1
  • the case of the upper arm OFF and the lower arm ON is represented as 0.
  • the mode is “7 ⁇ 6 ⁇ 1 ⁇ 0 ⁇ 1 ⁇ 6 ⁇ 7 ⁇ 6 ⁇ 1 ⁇ 0 ⁇ 1 ⁇ 2 ⁇ 7 ⁇ 2 ⁇ 1 ⁇ 0 ⁇ 1 ⁇ 2” at each switching of the upper and lower arms. ⁇ Repeated like “7 ...”. Then, the neutral point voltage changes the potential of Vdc / 3 as “Vdc / 2 ⁇ Vdc / 6 ⁇ ⁇ Vdc / 6 ⁇ ⁇ Vdc / 2 ⁇ ⁇ Vdc / 6 ⁇ Vdc / 6 ⁇ ... repeat.
  • the stray capacitance 947 (the stray capacitance between the winding and the stator core) repeats charging and discharging. Therefore, a common mode current flows from the stator core 945 to the center bracket 909 in metal contact with the stator 945, and a common mode current flows further to the housing 912, the front bracket 908, and the rear bracket 910.
  • stray capacitance 948 between stator core 941 and housing 912, front bracket 908 and rear bracket 910 is smaller than stray capacitance 947, stator core 941, center housing 909, housing 912, front bracket 908, rear bracket 910 This method is provided because it is a surface contact such as shrink fitting or bolt fastening.
  • FIG. 11 is a schematic view showing the shielded cables 820U to 820W of FIG. 10 in an enlarged manner.
  • shield 820US of shield cable 820U is connected at one end to case 12 of power conversion device 200 by connection member 820Ua and at the other end to housing 912 of rotary electric machine 900 by connection member 820Ub.
  • the shield 820VS of the shield cable 820V is connected to the case 12 at one end by the connection member 820Va, and is connected to the housing 912 by the connection member 820Vb at the other end.
  • the shield 820WS of the shield cable 820W is connected to the case 12 at one end by the connection member 820Wa, and is connected to the housing 912 by the connection member 820Wb at the other end.
  • the common mode current associated with the switching of the switching elements 328U to 328W and 330U to 330W provided in the inverter circuit 140 is, as shown by the broken line in FIG. 12, neutral point 946, stator core 941, housing 912, shield 802US to 802WS, Flowing back to the case 12, the virtual neutral point 510G of the capacitor 500Y of the power conversion device 200 is returned.
  • the common mode current flows from the housing 912 to the shield 802 US to 802 WS to the case 12 to the virtual neutral point 510G, thereby flowing back between the chassis ground 900G and the chassis ground 200G.
  • Common mode noise can be reduced.
  • Virtual neutral point 510G is connected to chassis ground 200G of power conversion device 200.
  • the AC bus bars 802U to 802W provided in the power conversion device 200 are directly connected to the AC terminals 902U to 902W of the rotary electric machine 900 as shown in FIG. Because of this, the measures using shielded cables 820U to 820W as shown in FIGS. 10 to 12 can not be applied.
  • the common mode current is chassis ground 900G on the rotating electric machine side as shown by a broken line. Flow to the chassis ground 200G on the rotating electric machine side. Therefore, the common mode current (common mode noise) adversely affects the control device on the vehicle side (the above-described upper control device) and the control circuit 172 of the power conversion device 200. Normally, the low-power control circuit 172 is grounded separately from the chassis ground 200G, but a common mode current flows into the control circuit 172 from the ground.
  • connection wiring 700 passes through the inside of the casing of the rotary electric machine 900 and the power conversion device 200.
  • Conductor bar 950b is provided to electrically conduct to stator core 941. Therefore, if the conduction resistance of conductor bar 950b is sufficiently reduced, the common mode current flowing into stator core 941 is indicated by the arrow in FIG. As a result, it flows into the conductor bar 950b and the conductor ring 950c instead of the shrink fitting surface of the stator core 941 and the center bracket 909.
  • connection wiring 700 as shown in FIG. 15, and virtual neutral point 510G via capacitor 510Ya.
  • virtual neutral point 510G is not connected to chassis ground 200G.
  • connection wiring 700 is connected to the virtual neutral point 510G via the capacitor 510Ya, it may be provided or omitted depending on the level of the generated noise. When the noise level is high, it is preferable to provide a capacitor 510Ya.
  • FIGS. 17 and 18 show an example of another structure of the stator 940.
  • FIG. FIG. 17 is a perspective view
  • FIG. 18 shows a cross section perpendicular to the rotor shaft.
  • the stator 942 has a stator core 943 and a three-phase armature winding 945.
  • a plurality of fixing portions 943X in which through holes for bolts are formed are provided on the outer periphery of the stator core 943.
  • the stator core 943 housed in the inner peripheral portion of the center bracket 909X is fastened to the center bracket 909X by a bolt 960.
  • At least one conductor bar 950 b extending in the axial direction of the stator core 943 is provided on the outer peripheral surface of the stator core 943 and is electrically conducted to the stator core 943.
  • Each conductor bar 950 b is electrically connected to a conductor ring 950 c provided near the axial end of stator core 943.
  • the connection wiring 700 is connected to the conductor ring 950c.
  • the current collection structure for the common mode current has the same structure as that of the above-described embodiment.
  • a gap is formed between the stator core 943 and the center bracket 909X, and the common mode current flowing from the stator core 943 to the center bracket 909X can be reduced. Therefore, current collection of common mode current by conductor bar 950b and conductor ring 950c can be performed more efficiently.
  • FIG. 18 is a view showing another embodiment of the mechanical-electrical integrated type electric drive unit.
  • the first housing portion 912a in which stator 940 is housed and the second housing portion 912b in which power conversion device 200 is housed are integrally formed in housing 912 of rotary electric machine 900.
  • the case 12 of the power conversion device 200 is omitted, and the components in the case 12 are directly disposed in the housing portion 912b.
  • the fixing portion (joint) between the case 12 of the power conversion device 200 and the housing 912 of the rotary electric machine 900 as shown in FIG. It is easy to contain in the body. Therefore, the radiation noise can be reduced. Further, since the case 12 of the power conversion device 200 can be omitted, cost reduction can be achieved as compared with the structure of FIG.
  • the rotor 930, the stator 940 having the stator core 941 on which the armature winding 945 is mounted, and the AC terminals 902U to 902W of the armature winding 945 are arranged. It is fixed to the outer periphery of housing 912, including: rotating electric machine 900 provided with housing 912 holding stator 940; inverter circuit 140; and AC bus bars 802U to 802W connecting inverter circuit 140 and AC terminals 902U to 902W. And the power converter 200.
  • conductor bar 950b and conductor ring 950c which are current collectors provided in contact with the outer peripheral surface of stator core 941 and collecting common mode current resulting from stray capacitance of stator 940, and the DC input side of inverter circuit 140 And a connection wiring 700 for connecting the virtual neutral point 510G of the above and the conductor ring 950c.
  • the common mode current flows into the conductor bar 950b as shown in FIG. 15, and flows into the virtual neutral point 510G on the DC input side of the inverter circuit 140 via the conductor ring 950c and the connection wiring 700.
  • the common mode current can be reduced with a simple configuration as described above, without providing a special noise reduction circuit as described in Patent Document 1.
  • connection wiring 700 connected to the conductor ring 950c has a fixing surface on which the housing 912 and the case 12 face each other.
  • the effect of common mode current on other devices is to draw in from inside the housing 912 to the inside of the case 12 so as to penetrate (the surface 912e of the housing 912 shown in FIG. 4 and the bottom of the case 12). It is preferable in terms of prevention.
  • the housing 912 further includes a first housing portion 912a for housing the stator core 941 and a second housing portion 912b integrally formed with the first housing portion 912a for housing the power conversion device 200. It is preferable to With such a configuration, there is no joint between the housing of the power conversion unit 200 and the housing of the rotating electrical machine, and it becomes easy to contain the common mode current in the metal housing and reduce radiation noise. can do.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Inverter Devices (AREA)
PCT/JP2012/078562 2011-11-28 2012-11-05 機電一体型の電動駆動装置 Ceased WO2013080748A1 (ja)

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JP2011259229A JP2013115904A (ja) 2011-11-28 2011-11-28 機電一体型の電動駆動装置
JP2011-259229 2011-11-28

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