JP2013115903A - Mechano-electric integration type electrically driven driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechano-electric integration type electrically driven driving device which efficiently cools a capacitor module provided in an electric power conversion apparatus.SOLUTION: An electrically-driven driving device 1 is formed by integrating a rotary electric machine 900 with an electric power conversion apparatus 200. In the rotary electric machine 900, a passage 919 is formed by a center bracket 909 and a housing 912. The electric power conversion apparatus 200 is fixed to an outer periphery of the housing 912. A case 12 of the electric power conversion apparatus 200 includes a housing space 405 where a capacitor module 500 is disposed and a passage formation part 12g where the passage 19 is formed. The electric power conversion apparatus 200 is fixed to the housing 912 so that a bottom surface 405f of the housing space 405, where the capacitor module 500 is disposed, contacts with the outer periphery of the housing 912.

Description

  The present invention relates to an electromechanical integrated electric drive device in which a rotating electrical machine and a power conversion device for driving the rotating electrical machine are integrally provided.

  As an electromechanical integrated electric drive device in which a rotating electrical machine (hereinafter, a motor, a generator, and a motor generator are collectively referred to as a rotating electrical machine) and a power converter are integrally provided, for example, Patent Document 1 There is what is described in. In the example described in Patent Document 1, the switching element power module, the smoothing capacitor, and the control board are arranged in this order from the case bottom side in a case attached to the motor housing. The switching element power module is placed on a heat sink provided in the case.

JP 2003-199363 A

  However, in an electromechanical power converter that controls a rotating electrical machine, not only switching element power modules but also electronic components used in the power converter (especially smoothing capacitors that tend to rise in temperature) are efficiently cooled. It is desirable to do. For example, in an electric vehicle that travels on a vehicle by rotational torque generated by the rotating electrical machine or a hybrid vehicle that travels based on the outputs of both the engine and the motor, the rotating electrical machine to which the power converter is attached is housed in the engine room, Ambient temperature tends to be high.

  According to a first aspect of the present invention, there is provided an electromechanically integrated electric drive device comprising: a rotor, a stator, a rotating electrical machine having a first refrigerant flow path and a housing holding the stator; an inverter circuit; and an outer periphery of the housing. A power conversion device that is fixed, and a power conversion device that includes a smoothing capacitor provided on a DC input side of the inverter circuit, a second refrigerant channel, and a smoothing device. An inverter case having a flow path forming portion in which a recess in which a capacitor is disposed is formed; and a bottomed cylindrical module case in which a power semiconductor element for power conversion is housed, and at least a part of the module case A plurality of power semiconductor modules disposed in the second refrigerant flow path, and the power converter has a bottom surface portion of the recess in which the smoothing capacitor is disposed. Wherein the of being fixed to the housing so as to contact the outer periphery.

  ADVANTAGE OF THE INVENTION According to this invention, the capacitor | condenser module which is a circuit component provided in the power converter device can be cooled more effectively by utilizing the cooling system by the side of a rotary electric machine.

It is a figure which shows the control block of the hybrid vehicle by which the electric drive device of this Embodiment is mounted. 3 is a block diagram illustrating a power conversion device 200. FIG. It is a figure explaining the structure of the electric circuit of the inverter circuit. It is an external appearance perspective view of the electric drive device 1 in this embodiment. It is a perspective view which shows the state which isolate | separated the rotary electric machine 900 and the power converter device 200. FIG. It is a perspective view which shows the state which isolate | separated the rotary electric machine 900 and the power converter device 200. FIG. 2 is a cross-sectional view of a rotating electrical machine 900. FIG. FIG. 3 is a diagram illustrating a refrigerant flow in the electric drive device 1. 2 is an exploded perspective view of a power conversion device 200. FIG. 2 is an exploded perspective view of a power conversion device 200. FIG. 3 is a plan view of a case 12. FIG. FIG. 4 is a view showing a bottom side of the case 12. It is the perspective view which looked at the case 12 from the bottom face side. It is a perspective view of power module 300U. It is a perspective view of power module 300U. It is a circuit diagram which shows the circuit structure of the power module 300U. 1 is an external perspective view of a capacitor module 500. FIG. 1 is an external perspective view of a capacitor module 500. FIG. FIG. 6 is a plan view showing a state where power modules 300U to 300W, a capacitor module 500, and an AC bus bar 802 are assembled to the case 12. It is a perspective view which shows in detail the connection state of each terminal of power module 300U-300W, and alternating current bus-bar 802U-802W. It is sectional drawing which shows the power converter device 200 and a part of rotary electric machine 900 to which the power converter device 200 is attached. It is a figure which shows the AA cross section of FIG. It is a figure which shows the internal structure of the power converter device 200, Comprising: It is an external appearance perspective view which deleted the case 12 and the lid | cover 8 from the power converter device 200. FIG. FIG. 3 is a view in which the case 12 is horizontally sectioned at the center of the inlet pipe 13 and the outlet pipe 14. It is a schematic diagram for demonstrating arrangement | positioning of the power modules 300U-300W. FIG. 3 is a cross-sectional view of the electric drive device 1 perpendicular to the axial direction.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a control block of a hybrid vehicle (hereinafter referred to as “HEV”). Engine EGN and rotating electrical machine 900 generate vehicle running torque. The rotating electrical machine 900 not only generates rotational torque, but also has a function of converting mechanical energy applied to the rotating electrical machine 900 from the outside into electric power.

  The rotating electrical machine 900 is, for example, a synchronous machine or an induction machine, and operates as a motor or a generator depending on the operation method as described above. When the rotary electric machine 900 is mounted on an automobile, it is desirable to obtain a small and high output, and a permanent magnet type synchronous motor using a magnet such as neodymium is suitable. Further, the permanent magnet type synchronous motor generates less heat from the rotor than the induction motor, and is excellent for automobiles from this viewpoint.

  The output torque on the output side of the engine EGN is transmitted to the rotating electrical machine 900 via the power distribution mechanism TSM. Then, the rotational torque from the power distribution mechanism TSM or the rotational torque generated by the rotating electrical machine 900 is transmitted to the wheels via the transmission TM and the differential gear DEF. On the other hand, during regenerative braking operation, 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 high-voltage battery 136. The charged electric power is used again as travel energy.

  Next, the power converter 200 will be described with reference to FIG. The inverter circuit 140 is electrically connected to the battery 136 via a DC connector (not shown), and power is exchanged between the battery 136 and the inverter circuit 140. When operating the rotating electrical machine 900 as a motor, the inverter circuit 140 generates AC power based on DC power supplied from the battery 136 via a DC connector (not shown). The AC power is supplied to the rotating electrical machine 900 via the AC bus bar 802 (802U to 802W).

  In the present embodiment, the vehicle can be driven only by the power of the rotating electrical machine 900 by operating the rotating electrical machine 900 as a motor by the electric power of the battery 136. Furthermore, in this embodiment, the battery 136 is charged by operating the rotating electrical machine 900 as a generator by the power of the engine 120 or the power from the wheels.

  Although omitted in FIG. 1, the battery 136 is also used as a power source for driving an auxiliary motor. Examples of the auxiliary motor include a motor that drives a compressor of an air conditioner, and a motor that drives a control hydraulic pump. DC power is supplied from the battery 136 to the auxiliary power module, and the auxiliary power module generates AC power and supplies it to the auxiliary motor. The auxiliary 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 auxiliary motor. The power conversion device 200 includes a capacitor module 500 for smoothing the DC power supplied to the inverter circuit 140.

  The power conversion device 200 includes a communication connector 21 for receiving a command from a host control device (not shown) or transmitting data representing a state to the host control device. The power conversion device 200 calculates a control amount of the rotating electrical machine 900 by the control circuit 172 based on a command input from the connector 21. Furthermore, the power conversion device 200 calculates whether to operate as a motor or a generator, generates a control pulse based on the calculation result, and supplies the control pulse to the driver circuit 174. The driver circuit 174 generates a driving pulse for controlling the inverter circuit 140 based on the supplied control pulse.

  Next, the configuration of the electric circuit of the inverter circuit 140 will be described with reference to FIG. In the following description, an insulated gate bipolar transistor is used as a semiconductor element, and hereinafter abbreviated as IGBT. The IGBT 328 and the diode 156 that operate as the upper arm, and the IGBT 330 and the diode 166 that operate as the lower arm constitute the series circuit 150 of the upper and lower arms. The inverter circuit 140 includes the series circuit 150 corresponding to three phases of the U phase, the V phase, and the W phase of the AC power to be output.

  These three phases correspond to the three-phase windings of the armature winding of the rotary electric machine 900 in this embodiment. The series circuit 150 of the upper and lower arms of each of the three phases outputs an alternating current from the intermediate electrode 169 that is the midpoint portion of the series circuit. The intermediate electrode 169 is connected through an AC terminal 159 to an AC bus bar 802 described below, which is an AC power line to the rotating electrical machine 900.

  The collector electrode 153 of the IGBT 328 of the upper arm is electrically connected to the capacitor terminal 506 on the positive electrode side of the capacitor module 500 via the positive electrode terminal 157. The emitter electrode of the IGBT 330 of the lower arm is electrically connected to the capacitor terminal 504 on the negative electrode side of the capacitor module 500 via the negative electrode terminal 158.

  As described above, the control circuit 172 receives a control command from the host control device via the connector 21, generates a control pulse based on the control command, and supplies the control pulse to the driver circuit 174. This control pulse is a control signal for controlling the IGBT 328 and the IGBT 330 constituting the upper arm or the lower arm of each phase series circuit 150 provided in the inverter circuit 140.

  Based on the control pulse, the driver circuit 174 supplies a drive pulse for controlling the IGBT 328 and IGBT 330 constituting the upper arm or the lower arm of each phase series circuit 150 to the IGBT 328 and IGBT 330 of each phase. The IGBT 328 and the IGBT 330 perform conduction or cutoff operation based on the drive pulse from the driver circuit 174, and convert the DC power supplied from the battery 136 into three-phase AC power. The converted electric power is supplied to the rotating electrical machine 900.

  The IGBT 328 includes a collector electrode 153, a signal emitter electrode 155, and a gate electrode 154. The IGBT 330 includes a collector electrode 163, a signal emitter electrode 165, and a gate electrode 164. A diode 156 is electrically connected between the collector electrode 153 and the emitter electrode 155. A diode 166 is electrically connected between the collector electrode 163 and the emitter electrode 165.

  As the switching power semiconductor element, a metal oxide semiconductor field effect transistor (hereinafter abbreviated as MOSFET) may be used. In this case, the diode 156 and the diode 166 are unnecessary. As a power semiconductor element for switching, IGBT is suitable when the DC voltage is relatively high, and MOSFET is suitable when the DC voltage is relatively low.

  The capacitor module 500 includes a capacitor terminal 506 on the positive electrode side, a capacitor terminal 504 on the negative electrode side, a power supply terminal 509 on the positive electrode side, and a power supply terminal 508 on the negative electrode side. A battery 136 is connected to the power supply terminals 509 and 508, and high-voltage DC power is input from the battery 136 and output from the capacitor terminals 506 and 504 to the inverter circuit 140.

  On the other hand, DC power converted from AC power by the inverter circuit 140 is supplied from the capacitor terminals 506 and 504 to the capacitor module 500, supplied from the power supply terminals 509 and 508 to the battery 136 via the DC connector 138, and supplied to the battery 136. Accumulated.

  The control circuit 172 includes a microcomputer (hereinafter referred to as “microcomputer”) for calculating the switching timing of the IGBT 328 and the IGBT 330. Information input to the microcomputer includes a target torque value required for the rotating electrical machine 900, a current value supplied from the series circuit 150 to the rotating electrical machine 900, and a magnetic pole position of the rotor of the rotating electrical machine 900.

  The target torque value is based on a command signal output from a host controller (not shown). The current value is detected based on a detection signal from the current sensor 180. 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 rotating electrical machine 900. In this embodiment, the current sensor 180 detects the current value of three phases, but the current value for two phases may be detected and the current for three phases may be obtained by calculation. .

  The microcomputer in the control circuit 172 calculates the d-axis and q-axis current command values of the rotating electrical machine 900 based on the target torque value, the calculated d-axis and q-axis current command values, and the detected d The voltage command values for the d-axis and q-axis are calculated based on the difference between the current values for the axes and q-axis, and the calculated voltage command values for the d-axis and q-axis are calculated based on the detected magnetic pole position. It is converted into voltage command values for phase, V phase, and W phase. Then, the microcomputer generates a pulse-like modulated wave based on a comparison between the fundamental wave (sine wave) and the carrier wave (triangular wave) based on the voltage command values of the U phase, V phase, and W phase, and the generated modulation wave The wave is output to the driver circuit 174 as a PWM (pulse width modulation) signal.

  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 corresponding IGBT 330 of the lower arm. Further, when driving the upper arm, the driver circuit 174 amplifies the PWM signal after shifting the level of the reference potential of the PWM signal to the level of the reference potential of the upper arm, and uses this as a drive signal as a corresponding upper arm. Are output to the gate electrodes of the IGBTs 328 respectively.

  In addition, the microcomputer in the control circuit 172 detects abnormality (overcurrent, overvoltage, overtemperature, etc.) and protects the series circuit 150. For this reason, sensing information is input to the control circuit 172. For example, information on the current flowing through the emitter electrodes of the IGBTs 328 and IGBTs 330 is input to the corresponding drive units (ICs) from the signal emitter electrode 155 and the signal emitter electrode 165 of each arm. Thereby, each drive part (IC) detects an overcurrent, and when an overcurrent is detected, the switching operation of the corresponding IGBT 328 and IGBT 330 is stopped, and the corresponding IGBT 328 and IGBT 330 are protected from the overcurrent.

  Information on the temperature of the series circuit 150 is input to the microcomputer from a temperature sensor (not shown) provided in the series circuit 150. In addition, voltage information on the DC positive side of the series circuit 150 is input to the microcomputer. The microcomputer performs over-temperature detection and over-voltage detection based on the information, and stops switching operations of all the IGBTs 328 and IGBTs 330 when an over-temperature or over-voltage is detected.

  FIG. 4 is an external perspective view of the electric drive device 1 according to the present embodiment. The electric drive device 1 is an integral structure of the rotating electrical machine 900 and the power conversion device 200 shown in FIG. 5 and 6 show a state in which the rotating electrical machine 900 and the power converter 200 are separated. Although details will be described later, the rotating electrical machine 900 includes a housing 912, a front bracket 908, and a rear bracket 910 as exterior parts, which are usually made by metal die casting or casting represented by aluminum.

  As shown in FIG. 4, the power conversion device 200 is fixed to the outer peripheral surface of the housing 912 that is the radial position of the rotating electrical machine 900. A front bracket 908 and a rear bracket 910 are provided at both axial ends of the housing 912. A rotor shaft 920 projects from the center of the front bracket 908.

  The case 12 in which circuit components constituting the power conversion device 200 are accommodated has a substantially cubic shape, and the lid 8 is fixed to the upper opening. Although details will be described later, a flow path for flowing a cooling medium is formed in the case 12, and an inlet pipe 13 for flowing the cooling medium and an outlet pipe for discharging the cooling medium are formed on the side wall of the case 12. 14 is provided. The connector 21 described above is exposed to the outside from the side walls 12b of the case 12 and openings 12h and 8a (see FIGS. 5 and 6) formed in the lid 8.

  As shown in FIG. 5, AC terminals 902U, 902V, and 902W of the rotating electrical machine 900 are disposed on the mounting surface 912e of the housing 912 to which the case 12 is fixed, and are recessed so as to be adjacent to the AC terminals 902U, 902V, and 902W. The flat surface 912f is formed. When the case 12 is fixed to the housing 912, a bottom surface portion 405f formed on the bottom surface side of the case 12 is configured to come into contact with the surface 912f. In addition, it is good also as a structure which contacts indirectly on both sides of a thermal radiation sheet | seat, grease, etc. As shown in FIG. 6, the bottom surface portion 405 f is formed so as to protrude from the lower ends of the side walls 12 a to 12 d provided on the four sides of the case 12. Reference numeral 420 denotes a lower cover that covers the bottom side of the flow path.

  Thus, in this Embodiment, when integrating the power converter device 200 and the rotary electric machine 900, it is set as the structure where the case 12 of the power converter device 200 contacts only the housing 912 of the rotary electric machine 900. FIG. Therefore, on the rotating electrical machine 900 side, machining for ensuring the mounting surface accuracy may be performed only on the housing 912, and the other front bracket 908 and the rear bracket 910 are not required, so that productivity is improved.

  On the bottom surface side of the case 12, a surface 12e that is recessed from the bottom surface portion 405f is formed separately from the above-described bottom surface portion 405f. A through hole 12i is formed in the surface 12e, and AC bus bars 802U, 802V, and 802W are bent from the upper side to the lower side of the through hole 12i. The AC bus bars 802U, 802V, 802W are connected to AC terminals 902U, 902V, 902W disposed on the mounting surface 912e of the housing 912.

  FIG. 7 is a cross-sectional view of the rotating electrical machine 900. A stator 940 provided with armature windings for three phases is fixed to the center bracket 909. The rotor shaft 920 to which the rotor 930 is fixed is rotatably supported by the front bracket 908 and the rear bracket 910 at both ends. The rotor 930 is housed with a slight gap 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 940. The center bracket 909 is housed inside the housing 912, and flow paths 919 b and 919 c are formed by the groove of the center bracket 909 and the inner peripheral surface of the housing 912. The flow path 919b and the flow path 919c are connected to form a single connected flow path 919. In other words, the center bracket 909 and the housing 912 form a motor housing having a flow path 919. And the stator 940 is cooled by the refrigerant | coolant by hold | maintaining the stator 940 to the inner peripheral side of the motor housing provided with such a flow path. The AC terminals 902U to 902W are provided so as to protrude from the surface 912e of the housing 912, and corresponding armature windings of the stator 940 are connected to each of the AC terminals 902U to 902W.

  FIG. 8 is a view showing the flow of the refrigerant in the electric drive device 1, and the arrows show the flow of the refrigerant. The refrigerant is supplied from an inlet pipe 13 provided in the case 12 of the power conversion device 200 and flows into a flow path (details will be described later) formed in the case. The refrigerant that has flowed through the flow path of the case 12 is discharged from the outlet pipe 14. The outlet pipe 14 is connected to an inlet pipe 913 provided on the outer periphery of the housing 912 of the rotating electrical machine 900 via a relay member 14a, and the refrigerant discharged from the outlet pipe 14 is shown in FIG. 7 from the inlet pipe 913. It flows into the flow path 919b. The refrigerant flows in the order of the flow path 919b and the flow path 919c, and is discharged from an outlet pipe 914 provided on the outer periphery of the housing 912 and connected to the flow path 919c.

  Thus, the refrigerant flows through the flow path of the case 12 and the flow paths 919b and 919c of the rotating electrical machine 900, whereby the circuit components and the rotating electrical machine 900 provided in the case 12 are cooled and the stator of the rotating electrical machine 900 is also cooled. 940 is cooled. In the present embodiment, as shown in FIG. 8, the refrigerant flow is connected from the power conversion device 200 to the rotating electrical machine 900 using the relay member 14a which is a communication pipe, but the relay member 14a is used. Therefore, there is no problem even if the refrigerant is caused to flow into and out of the power converter 200 and the rotating electrical machine 900 individually. As the refrigerant, for example, water or LLC (Long Life Coolant: antifreeze) is often used, but in the following, it will be described as cooling water.

  Next, the detailed structure of the power converter 200 will be described. 9 and 10 are exploded perspective views of the power converter 200. FIG. The case 12 has a rectangular parallelepiped shape in plan view, and is formed with an upper storage space for storing the control circuit board 20, the driver circuit board 22, the AC bus bars 802U, 802V, 802W, and the like, and a flow path forming portion 12g. And a lower storage space. A control circuit 172 shown in FIG. 2 is mounted on the control circuit board 20 having the connector 21, and a driver circuit 174 is mounted on the driver circuit board 22. The control circuit board 20 and the driver circuit board 22 are connected by a flat cable 25. The upper opening of the case 12 is covered with the lid 8. The lid 8 and the case 12 have openings 8a and 12h for the connector 21 as shown in FIG. Low voltage DC power for operating the control circuit in the power converter 200 is supplied from the connector 21.

  Although details will be described later, a flow path 19 (see FIG. 12) through which cooling water flows is formed in the flow path forming portion 12g. The flow path 19 is formed in a U-shape that flows in parallel with the three side walls of the case 12 (side walls 12 a to 12 c shown in FIG. 6), and the cooling water is provided on the side wall 12 d of the case 12. Flows into the flow path from the inlet pipe 13 and flows out from the outlet pipe 14 provided on the side wall 12d. In addition, the side wall 12d is formed in a stepped portion where the pipes 13 and 14 are provided.

  FIG. 11 is a plan view of the case 12, and FIG. 12 is a view showing the bottom side of the case 12. FIG. 13 is a perspective view of the case 12 as seen from the bottom side. Three openings 402 a to 402 c communicating with the flow path 19 are formed on the upper surface side of the flow path forming portion 12 g where the flow path 19 is formed. Through these openings 400a to 400c, power modules 300U, 300V, and 300W containing electronic components constituting the series circuit 150 of FIG. 3 are inserted into the flow path 19 (see FIG. 9). The power module 300U includes a U-phase series circuit 150, the power module 300V includes a V-phase series circuit 150, and the power module 300W includes a W-phase series circuit 150. These three power modules 300U to 300W have the same configuration and the same external shape. The openings 402a to 402c are closed by the flange portions of the inserted power modules 300U to 300W.

  A storage space 405 that is a recess in which the capacitor module 500 is stored is formed at the center of the flow path forming portion 12g. The storage space 405 is formed so as to be surrounded by the U-shaped channel 19. The side surfaces 405a to 405d of the storage space 405 are formed so as to substantially contact the side surface of the capacitor module 500 disposed on the bottom surface portion 405f. The capacitor module 500 stored in the storage space 405 is cooled by the cooling water flowing in the flow path 19. In order to further improve the contact state between the side surface of the capacitor module 500 and the side surfaces 405a to 405d, the gap between the side surface of the capacitor module 500 and the side surfaces 405a to 405d may be filled with gel or grease. DC terminals 509 and 508 provided on the capacitor module 500 protrude from 12j of the case 12 and are connected to the battery 136 by DC wiring (not shown).

  As shown in FIGS. 12 and 13, a U-shaped opening 404 is formed along the flow path 19 on the lower surface 12e of the flow path forming portion 12g. The opening 404 is closed by a U-shaped lower cover 420. A seal member 409e is provided between the lower cover 420 and the surface 12e of the case 12, and airtightness is maintained. Note that the outer peripheral surface of the bottom surface portion 405f of the storage space 405 protrudes below the surface 12e of the flow path forming portion 12g.

  The flow path 19 having a U-shape is divided into three flow path sections 19a, 19b, and 19c according to the direction in which the cooling water flows. Although details will be described later, the first flow path section 19a is provided along the side wall 12a facing the side wall 12d provided with the pipes 13 and 14, and the second flow path section 19b is provided on one side of the side wall 12a. The third flow path section 19c is provided along the side wall 12c adjacent to the other side of the side wall 12a. The upstream flow passage section 19b communicates with the communication path 12k to which the inlet pipe 13 is attached. The downstream channel section 19c communicates with the communication path 12m to which the outlet pipe 14 is attached. As shown in FIG. 12, the cooling water flows from the inlet pipe 13 into the flow path section 19b, flows in the order of the flow path section 19b, the flow path section 19a, and the flow path section 19c as indicated by the broken line arrows. Leaked.

  The opening 402a described above is formed at a position facing the flow path section 19a on the upper surface of the flow path forming portion so that the longitudinal direction is parallel to the side wall 12a. The opening 402b is formed at a position facing the flow path section 19b on the upper surface of the flow path forming portion so that the longitudinal direction is parallel to the side wall 12b. The opening 402c is formed at a position facing the flow path section 19c on the upper surface of the flow path forming portion so that the longitudinal direction is parallel to the side wall 12c. The power modules 300U to 300W are inserted into the flow path 19 through the openings 402a to 402c. Seal members 409a to 409c are provided between the power modules 300U to 300W and the case 12 to maintain airtightness.

  As shown in FIG. 10, the lower cover 420 is formed with convex portions 406 protruding in the bottom direction of the case 12 at positions facing the above-described openings 402 a to 402 c. As can be seen from FIG. 9, these convex portions 406 are indented when viewed from the flow path 19 side, and the lower end portions of the power modules 300U to 300W inserted from the openings 402a to 402c are in these indented portions. Get in. Since the case 12 is formed so that the opening 404 and the openings 402a to 402c face each other, the case 12 is configured to be easily manufactured by aluminum casting.

  AC bus bars 802U to 802W are arranged above the capacitor module 500 and in the upper storage space of the case 12. One end of each AC bus bar 802U to 802W is connected to the AC terminal 320B of the corresponding power module, and the other end passes through a through hole 12i formed in the flow path forming portion 12g and is provided on the mounting surface 912e of the housing 912. Connected to terminals 902U to 902W (see FIG. 5). In the portion of the through hole 12i, an insulating sheet 950 is provided between the AC bus bars 802U to 802W and the flow path forming portion 12g. The AC bus bars 802U to 802W can measure current values by a current sensor 180 (not shown).

  Depending on the operating conditions of the rotating electrical machine 900, heat from the AC terminals 902U to 902W of the rotating electrical machine 900 may be transferred to the AC bus bars 802U to 802W, and the AC bus bars 802U to 802W may be burned and become high temperature. However, in this embodiment, the AC bus bars 802U to 802W pass through the through hole 12i provided between the side wall 12a of the flow path forming portion 12g and the flow path 19 instead of between the flow path 19 and the storage space 405. Are connected to AC terminals 902U to 902W of the rotating electrical machine 900. For this reason, the influence on the capacitor | condenser module 500 of the heat transmitted from AC terminal 902U-902W can be reduced.

  As described above, the driver circuit board 22 is disposed above the AC bus bars 802U to 802W, and the control circuit board 20 and the driver circuit board 22 are connected by the flat cable 25. In this way, the power modules 300U to 300W, the driver circuit board 22 and the control circuit board 20 are arranged hierarchically in the case height direction, and the control circuit board 20 is located farthest from the high power system power modules 300U to 300W. Since it is disposed, it is possible to reduce mixing of switching noise and the like on the control circuit board 20 side. The case 12 is formed of a metal material such as aluminum.

  A detailed configuration of the power modules 300U to 300W used in the inverter circuit 140 will be described with reference to FIGS. The power modules 300U to 300W all have the same structure, and the structure of the power module 300U will be described as a representative. 14 to 16, the signal terminal 325U corresponds to the gate electrode 154 and the signal emitter electrode 155 disclosed in FIG. 3, and the signal terminal 325L corresponds to the gate electrode 164 and the emitter electrode 165 disclosed in FIG. . Further, the DC positive terminal 315B is the same as the positive terminal 157 disclosed in FIG. 3, and the DC negative terminal 319B is the same as the negative terminal 158 disclosed in FIG. Furthermore, the AC terminal 320B is the same as the AC terminal 159 disclosed in FIG.

  FIG. 16 is a circuit diagram showing a circuit configuration of the power module 300U. The collector electrode of the IGBT 328 on the upper arm side and the cathode electrode of the diode 156 on the upper arm side are connected via a conductor plate 315. Similarly, the collector electrode of the IGBT 330 on the lower arm side and the cathode electrode of the diode 166 on the lower arm side are connected via the conductor plate 320. Further, the emitter electrode of the IGBT 328 on the upper arm side and the anode electrode of the diode 156 on the upper arm side are connected via a conductor plate 318. Similarly, the emitter electrode of the IGBT 330 on the lower arm side and the anode electrode of the diode 166 on the lower arm side are connected via a conductor plate 319. Conductor plates 318 and 320 are connected by an intermediate electrode 329. With such a circuit configuration, an upper and lower arm series circuit is formed.

  In a bottomed cylindrical module case 304, which is a CAN-type cooler shown in FIGS. 14 and 15, power semiconductor elements (IGBT 328, IGBT 330, diode 156, diode constituting the series circuit 150 of the upper and lower arms shown in FIG. 166) is housed. A gap in the module case 304 is filled with a sealing resin 351, and the stored power semiconductor element and the like are sealed with the sealing resin 351.

  The module case 304 is made of a member having electrical conductivity, for example, an aluminum alloy material (Al, AlSi, AlSiC, Al—C, etc.), and is integrally formed without a joint. The bottomed cylindrical module case 304 has a structure in which no opening other than the insertion port 306 is provided, and a flange 304B is formed in the insertion port 306. Moreover, as FIG.14, 15 shows, the wide surface where the flat module case 304 opposes comprises the 1st heat radiating surface 307A and the 2nd heat radiating surface 307B. A plurality of fins 305 are formed so as to be uniformly distributed on the first heat radiating surface 307A and the second heat radiating surface 307B.

  Each power semiconductor element (IGBT 328, IGBT 330, diode 156, diode 166) in the module case 304 is disposed so as to face the heat radiation surfaces 307A, 307B. Three surfaces (two side surfaces and a bottom surface) connecting the first heat radiation surface 307A and the second heat radiation surface 307B are narrower than the first heat radiation surface 307A and the second heat radiation surface 307B. The shape of the module case 304 does not need to be an accurate rectangular parallelepiped, and the corner portion may form a curved surface as shown in FIGS.

  By using the metal case having such a shape, even when the module case 304 is inserted into the flow path 19 through which a cooling medium such as water or oil flows, a seal against the refrigerant can be secured by the flange 304B. It is possible to prevent the medium from entering the inside of the module case 304 with a simple configuration.

  A metallic DC positive wiring 315A and a DC negative wiring 319A for electrical connection with the capacitor module 500 are provided outside the insertion port 306 of the module case 304, and a DC positive terminal 315B ( 157) and a DC negative terminal 319B (158), respectively. Further, a metallic AC wiring 320A for supplying AC power to the rotating electrical machine 900 is provided, and an AC terminal 320B (159) is formed at the tip thereof.

  Further, metal signal wirings 324U and 324L for electrical connection with the driver circuit 174 are provided outside the insertion port 306, and a signal terminal 325U (154, 155) and a signal terminal are provided at the tip thereof. 325L (164, 165) are formed. In the present embodiment, as shown in FIG. 16, the signal wiring 324U is connected to the IGBT 328, and the signal wiring 324L is connected to the IGBT 330.

  The DC positive electrode wiring 315A, the DC negative electrode wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L are integrally molded as the auxiliary mold body 600 in a state where they are insulated from each other by the wiring insulating portion 608 formed of a resin material. Is done. The wiring insulating portion 608 also acts as a support member for supporting each wiring, and a thermosetting resin or a thermoplastic resin having an insulating property is suitable for the resin material used therefor. Thereby, it is possible to secure insulation between the DC positive electrode wiring 315A, the DC negative electrode wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L, and high-density wiring is possible.

  As shown in FIG. 16, one end of the DC positive electrode wiring 315A, the DC negative electrode wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L of the auxiliary mold body 600 is metal-bonded to the upper and lower arm series circuit. For example, TIG welding can be used for this metal joining. In the integrally molded auxiliary mold body 600, the wiring insulating portion 608 is fixed to the module case 304 with screws 309.

  Thereafter, the gap in the module case 304 is filled with a sealing resin 351, and the electronic components constituting the upper and lower arm series circuit 150 are sealed in the module case 304. As a result, the metal bonded connection portion is also sealed in the module case 304 by the sealing resin 351. Thereby, since a necessary insulation distance can be stably ensured between the connection portion and the module case 304, the power module 300U can be reduced in size as compared with the case where sealing is not performed.

  17 and 18 are external perspective views of the capacitor module 500. FIG. A plurality of capacitor cells are provided in the capacitor module 500. Capacitor terminals 503a to 503c are provided on the upper surface of the capacitor module 500 so as to protrude. The capacitor terminals 503a to 503c are provided so as to correspond to the positive terminal 157 and the negative terminal 158 of the power modules 300U to 300W. The capacitor terminals 503a to 503c have the same shape. An insulating sheet 507 is provided between the negative-side capacitor terminal 504 and the positive-side capacitor terminal 506 constituting each of the capacitor terminals 503a to 503c, and insulation between the terminals is ensured.

  On the side surface 500d side of the capacitor module 500, power terminals 508 (N) and 509 (P) are provided. When the capacitor module 500 is disposed on the bottom surface portion 405f of the storage space 405 shown in FIG. 11, the side surfaces 500a, 500b, 500c, and 500d of the capacitor module 500 are the side surfaces 405a, 405b, 405c, and 405d of the storage space 405 of the flow path forming portion 12g. Opposite to.

  FIG. 19 is a plan view showing a state where the power modules 300U to 300W, the capacitor module 500, and the AC bus bar 802 are assembled to the case 12. The capacitor module 500 is stored in the storage space 405, and the power modules 300U to 300W are inserted into the openings 402a to 402c of the flow path forming unit 12g. One ends of the AC bus bars 802U to 803W are connected to the AC terminals 320B of the power modules 300U to 300W.

  20 shows a DC positive terminal 315B, a DC negative terminal 319B and an AC terminal 320B of the power modules 300U to 300W, a positive capacitor terminal 506, a negative capacitor terminal 504 of the capacitor module 500, and a connection portion 805 of the AC bus bars 802U to 802W. It is a perspective view which shows the connection state of in detail. At the connection between each power module 300U to 300W and the capacitor module 500, the DC positive terminal 315B is welded to the positive capacitor terminal 506, and the DC negative terminal 319B is welded to the negative capacitor terminal 504. Moreover, in the connection part between the power modules 300U to 300W and the AC bus bars 802U to 802W, the AC terminal 320B is welded to the connection part 805 of the bus bar. Note that the DC positive terminal 315B, the DC negative terminal 319B, the positive capacitor terminal 506, the negative capacitor terminal 504, and the connection portion 805 have irregular shapes at the tips, and heat is concentrated on the irregular portions during welding. It has become.

  21 to 23 are diagrams illustrating a connection structure between the power conversion device 200 and the rotating electrical machine 900 in the electric drive device 1. FIG. 21 is a cross-sectional view showing the power conversion device 200 and a part of the rotating electrical machine 900 to which the power conversion device 200 is attached. 22 is a cross-sectional view taken along the line AA in FIG. FIG. 23 is a diagram illustrating an internal structure of the power conversion device 200 and is an external perspective view in which the case 12 and the lid 8 are removed from the power conversion device 200.

  As shown in FIG. 23, the signal terminals 325U and 325L of the power modules 300U to 300W are inserted into through-holes of the driver circuit board 22 disposed above (upper storage space) of the power modules 300U to 300W, and are soldered or the like. It is connected. Thus, the upper arm gate electrode 154 and signal emitter electrode 155, and the lower arm gate electrode 164 and signal emitter electrode 165 shown in FIG. 3 are connected to the driver circuit 174.

  As shown in FIGS. 19 and 20, AC bus bars 802U to 802W are connected to AC terminals 320B of corresponding power modules 300U to 300W with connection portions 805 provided at one ends thereof. As shown in FIGS. 21 and 23, these AC bus bars 802U to 802W are extended from the AC terminals 320B of the power modules 300U to 300W in the direction of the through holes 12i formed in the flow path forming portion 12g. The hole 12i is bent in an L shape toward the bottom surface of the case 12. The bent end portions of the AC bus bars 802U to 802W are fixed to the AC terminals 902U to 902W by bolts 905.

  As shown in FIG. 22, three-phase armature windings of rotating electric machine 900 are connected to AC terminals 902U to 902W. Therefore, in the case of the structure in which AC bus bars 802U to 802W are directly connected to AC terminals 902U to 902W as in the present embodiment, there is a possibility that AC bus bars 802U to 802W are beaten by heat transfer from the three-phase armature winding. is there.

  However, in the present embodiment, the connection position between the AC bus bars 802U to 802W and the AC terminals 902U to W is indicated by the region outside the U-shaped channel 19, that is, the region BC and the region AD in FIG. It is provided in a region outside the rectangular region. Therefore, since the flow path 19 through which the cooling water flows is formed between the AC bus bars 802U to 802W and the capacitor module 500 that have reached a high temperature, the thermal influence on the capacitor module 500 can be reduced.

  Furthermore, in the present embodiment, the AC bus bars 802U to 802W are brought into contact with the flow path forming portion 12g via an insulating member such as the insulating sheet 950 in the region of the through hole 12i shown in FIG. With such a structure, even if there is heat transfer from the three-phase armature winding of the rotating electrical machine 900, the heat is transferred from the contacted flow path forming portion 12g to the cooling water flowing through the flow path 19. And the temperature rise of the AC bus bars 802U to 802W can be suppressed.

  In this embodiment, for the convenience of arrangement of AC terminals 902U to 902W, AC bus bars 802U to 802W are indirectly contacted with the flow path forming portion 12g outside the flow path 19 where the power module 300V is disposed. However, the contact location is not limited to this. For example, when the positions of the AC terminals 902U to 902W are on the side of the side wall 12b, a through hole through which the AC bus bars 802U to 802W pass is formed outside the opening 402b, and the portion is brought into contact with the flow path forming unit 12g. To. That is, the AC bus bars 802U to 802W and the AC terminals 902U to 902W are connected outside the flow path 19.

  In the present embodiment, the substantially L-shaped AC bus bars 802U to 802W are each formed as one member, but a plurality of members may be connected. There is no problem even if it passes through a current sensor 180 (not shown). In general, AC bus bars 802U to 802W tend to be hot because current for driving the rotating electrical machine 900 flows, which may affect the surrounding members. In particular, since the capacitor module 500 is not directly arranged in the cooling water of the flow path 19 as in the power modules 300U to 300W, it is necessary to pay attention to thermal effects.

  By the way, the side surfaces 500 a to 500 c of the capacitor module 500 are opposed to the side surfaces 405 a to 405 c near the flow path 19. For this reason, heat radiation from the side surfaces 500a to 500c is effectively performed, but the other surfaces of the capacitor module 500 are inferior in terms of heat radiation.

  Therefore, in the present embodiment, in order to further improve the cooling performance of the capacitor module 500, the outer peripheral surface of the bottom surface portion 405f with which the bottom surface 500f of the capacitor module 500 is in contact is cooled by the cooling water. The attachment surface 912e, more precisely, the surface 912f formed on the attachment surface 912e is brought into contact. As a result, the capacitor module 500 is also cooled by the cooling water flowing through the flow path 919 (919b, 919c) formed by the housing 912.

  FIG. 24 is a cross-sectional view of the case 12 in which the power modules 300U to 300W and the capacitor module 500 are arranged in a horizontal section at the center of the inlet pipe 13 and the outlet pipe 14. As described above, the U-shaped flow path 19 is formed in the flow path forming portion 12g of the case 12, and the U-phase is formed in the flow path section 19b formed along the left side wall 12b in the figure. A power module 300U is arranged. Similarly, in the flow path section 19a formed along the side wall 12a opposite to the side wall 12d where the inlet pipe 13 and the outlet pipe 14 are provided, the V-phase power module 300V is arranged, and the right side wall 12c A W-phase power module 300W is disposed in the flow path section 19c formed along the flow path.

  In the present embodiment, the U-shaped flow path 19 is formed along the three side walls 12a to 12c of the case 12 having a substantially square planar shape, and the power modules 300U to 300W are connected to the flow path sections 19a to 19c. When arranging, the flat power modules 300U to 300W were arranged in parallel to the side walls 12a to 12c. And the capacitor module 500 which is an electrical component was accommodated in the center area | region (storage space 405) enclosed by the flow path 19. FIG. With such an arrangement, it is possible to reduce the size of the case 12 in which the power modules 300U to 300W and the capacitor module 500 are housed, and to easily attach the rotating electrical machine 900 to the housing 912.

  When the three power modules 300U to 300W are arranged in a U shape, as shown in FIG. 24, at least one of the power modules 300V arranged between the pair of power modules 300U and 300W arranged in parallel is used. By arranging the portion so as to enter the region sandwiched between the power modules 300U and 300W, the size can be further reduced.

  FIG. 25 is a schematic diagram for explaining the arrangement of the power modules 300U to 300W. The power modules 300U to 300W have the same structure and the same shape. The width (length in plan view) of the side walls 12b and 12c of the case 12 needs to be at least about the sum of the length L1 along the flow path of the power modules 300U to 300W and the length L2 of the communication paths 12k and 12m. is there. On the other hand, at least the dimension L1 is required for the side wall 12a. Of course, in practice, as shown in FIG. 24, it is necessary to slightly adjust the dimensions in consideration of the flow of the cooling water such as the connection portion of the flow path section.

  Therefore, when trying to reduce the installation area of the power conversion device 200 as much as possible, it is conceivable to reduce the size of the power conversion device 200 by making the shape (planar shape) when viewed in plan view substantially square. . As described above, since a communication path is necessary in the direction along the side walls 12b and 12c, from the viewpoint of miniaturization, as shown in FIG. It is preferable to arrange the power module 300V so that a part of 300V is included.

  The horizontal dimension (width dimension of the side wall 12a) of the arrangement space in FIG. 25 is at least about L1 + 2 · L3 when the thickness of the power module is L3. Therefore, if L3 and L4 are set so that the vertical dimension L1 + L2 + (L3−L4) is approximately the same as L1 + L3, the area in plan view can be further reduced, and a substantially square shape can be obtained. Become. At this time, the flow path section 19a is formed so as to pass through a region between the power modules 300U and 300W as shown in FIG. In the example shown in FIG. 24, the interval between the power modules 300U and 300W is slightly larger than the dimension L1 of the power module 300V due to the restriction due to the dimension of the capacitor module 500.

  By concentrating the positions of the pipes 13 and 14 on one side wall 12d, the flow of the cooling water from the inlet pipe 13 to the flow path section 19b and from the flow path section 19c to the outlet pipe 14 becomes a straight line, so that the pressure loss Can be made as small as possible. In addition, it is possible to suppress an increase in the installation space of the apparatus due to the protrusion of the pipe, and it is possible to improve on-vehicle performance. Further, when the pipes 13 and 14 are press-fitted into the communication passages 12k and 12m, the workability and productivity are improved because the press-fitting work is performed only on one surface of the housing.

  Further, since the flow path 19 is provided so as to surround the three sides of the capacitor module 500, the capacitor module 500 can be effectively cooled. By the way, the electric drive device 1 is generally often arranged in an engine room. Since the inside of the engine room becomes relatively high due to heat from the engine, the rotating electrical machine 900, and the like, heat intrusion from the surroundings to the power converter 200 becomes a problem. However, as shown in FIG. 24, since the capacitor module 500 is surrounded on the three sides by the flow path 19 through which the cooling water flows, it is possible to effectively block heat intrusion from around the apparatus. Furthermore, when attaching the power conversion device 200 to the housing 912 of the rotating electrical machine 900, the outer peripheral surface of the bottom surface portion 405f on which the capacitor module 500 is placed is brought into contact with the housing 912 through which cooling water flows. The cooling effect of the capacitor module 500 can be further enhanced.

  FIG. 26 is a cross-sectional view of the electric drive device 1 perpendicular to the axial direction, and is a cross-sectional view as viewed from the front bracket 908 direction. As described above, the openings 402a to 402c formed in the flow path forming portion 12g are closed by the flange 304B provided in the module case 304 of the power modules 300U to 300W. In the power modules 300U to 300W, the heat radiation surfaces 307A and 307B on which the heat radiation fins 305 are formed are arranged in the flow path 19, and the lower end portion on which the fins 305 are not provided is a convex portion formed on the lower cover 420. It is housed inside the inner depression 406. Thereby, it is possible to prevent the cooling water from flowing into the space where the fins 305 are not formed, and to prevent the cooling effect from being lowered.

  In the electromechanical integrated electric drive device 1 according to the present embodiment, a relatively heavy capacitor module 500 is arranged at the lower center of the power converter 200 as shown in FIG. Therefore, the power converter 200 has a good center-of-gravity balance, and when the vibration is applied, the power converter 200 part is not easily violated, which is very suitable for an electromechanical integrated structure.

  In FIG. 26, the power conversion device 200 is fixed so that the bottom surface portion 405 f different from the side walls 12 a to 12 c of the case 12 is in contact with the surface 912 f of the mounting surface 912 e provided in the radial direction of the rotating electrical machine of the housing 912. Yes. The bottom surface portion 405f may be in direct contact with the surface 912f, or may be in indirect contact with a heat dissipation sheet, grease, or the like (not shown) interposed therebetween.

  With the cooling structure as shown in FIG. 26, the bottom surface 500f of the capacitor module 500 that does not face the flow path 19 is cooled by the cooling water flowing through the flow paths 919b and 919c of the housing 912 that houses the rotating electrical machine 900. be able to. That is, the capacitor module 500 can be cooled in a double manner using not only the cooling water flowing through the flow path 19 of the power conversion device 200 but also the cooling water flowing through the flow paths 919b and 919c of the rotating electrical machine 900. As a result, the cooling effect of the capacitor module 500 is improved.

  Next, the attachment position of the power conversion device 200 to the housing 912 will be described with reference to FIGS. In the present embodiment, as described above, the bottom surface portion 405f of the case 12 is brought into contact with the surface 912f of the housing 912 when the power conversion device 200 is attached in the radial direction of the rotating electrical machine 900. The flow path 919 of the housing 912 is formed in a ring shape in the circumferential direction of the housing 912 as shown in FIG. 26, and a part of the heat of the capacitor module 500 passes through the bottom surface portion 405f and the surface 912f as indicated by an arrow H. Heat is radiated to the cooling water in the flow path 919. Therefore, in order to cool the capacitor module 500 more preferably, the radial distance between the bottom surface portion 405f of the case 12 and the shaft core J of the rotating electrical machine 900 is made as small as possible so as to be close to the flow path 919 of the housing 912. Is good. At this time, the bottom surface 500f of the capacitor module 500 needs to be cooled in a well-balanced manner, and it is desirable that the difference between the minimum distance Rmin and the maximum distance Rmax from the bottom surface 500f to the flow paths 919b and 919c of the rotating electrical machine 900 is small.

  Therefore, the position of the center axis of the rotating electrical machine 900 (the leg of the perpendicular drawn from the axis J of the rotating electrical machine 900 to the surface 912f) enters the contact region between the surface 912f and the bottom surface portion 405f of the case 12. Is preferably fixed to the housing 912. More preferably, the center position of the bottom surface portion 405f (the center position with respect to the position in the left-right direction in FIG. 26) and the position of the axis J of the rotating electrical machine 900 should match. With such an arrangement, the difference between the minimum distance Rmin and the maximum distance Rmax is minimized with respect to the distance from the bottom surface 500f of the capacitor module 500 to the flow path 919 of the rotating electrical machine 900. As a result, the cooling balance in the bottom surface 500f of the capacitor module 500 is improved.

  As described above, among the six surfaces of the capacitor module 500, the three side surfaces 500a to 500c are cooled by the cooling water in the flow passage sections 19a to 19c, and the bottom surface 500f is cooled using the cooling water flowing through the housing 912. can do. Then, the remaining two surfaces 500g and 500d (see FIG. 17) are examined as follows.

  First, in order to cool the side surface 500d, it is necessary to fix the side wall 12d of the case 12 to the mounting surface 912e provided in the housing 912. However, the side wall 12d is provided with an inlet pipe 13 and an outlet pipe 14 for the cooling water, which is an obstacle to attaching the case 12 to the housing 912, and is not the best choice. Therefore, the side surface 500d of the capacitor module facing the side wall 12d is unsuitable for double cooling (cooling of the channel 19 with cooling water and cooling of the channel 919 with cooling water).

  Further, on the upper side of the surface 500g, the driver circuit board 22, the control circuit board 20, the signal terminals 325U and 325L of the auxiliary mold body 600, the DC positive terminal 315B, the DC negative terminal 319B, the AC terminal 320B, and the AC bus bar 802U. ˜802 W or the like is arranged. Therefore, it is difficult to directly or indirectly contact the surface 500g with the surface 912f of the mounting surface 912e. Therefore, the side surface 500g of the capacitor module facing the side wall 12g is not suitable for double cooling.

  On the other hand, since the bottom surface 500f of the capacitor module 500 is in contact with the bottom surface portion 405f of the case 12, it can be easily brought into contact with the surface 912f of the housing 912 through the bottom surface portion 405f. This is because, in the power conversion device 200 of the present embodiment, the shape of the three power modules 300U to 300W is flat, and the power modules 300U to 300W are the side walls 12a to 12c of the case 12 as shown in FIG. Are arranged along the flow path 19 so as to be parallel to each other. With such a configuration, the bottom surface portion 405f of the case 12 and the lower cover 420 can be arranged on the bottom surface 500f side of the capacitor module 500. As a result, by projecting the outer peripheral surface of the bottom surface portion 405f below the convex portion 406 of the lower cover 420, it is possible to easily contact the housing 912 of the rotating electrical machine 900, and the 500f surface of the capacitor module 500 is made to contact the housing 912. It can cool using the cooling water which flows.

  As described above, the electromechanically integrated electric drive device 1 described in the present embodiment has the following effects.

(1) The electric drive device 1 includes a rotary electric machine 900 having a rotor 930, a stator 940, and a flow path 919 formed therein and a motor housing (center bracket 909, housing 912) that holds the stator 940, and an inverter circuit 140. And a power converter 200 fixed to the outer periphery of the housing 912. The power conversion device 200 is a flow in which a smoothing capacitor module 500 provided on the DC input side of the inverter circuit 140 and a storage space 405 that is a recess in which the channel 19 and the capacitor module 500 are disposed are formed. A plurality of cases 12 having a case 12 having a path forming portion 12g and a bottomed cylindrical module case 304 in which a power semiconductor element for power conversion is accommodated, and at least a part of the module case 304 being disposed in the flow path 19 The power conversion apparatus 200 is fixed to the housing 912 so that the bottom surface portion 405f of the storage space 405 in which the capacitor module 500 is disposed is in contact with the outer periphery of the housing 912.

  Therefore, the capacitor module 500 is cooled by the refrigerant flowing through the flow path 19 of the flow path forming portion 12g, and is also cooled by the refrigerant flowing through the flow path 919 via the bottom surface portion 405f and the housing 912. As a result, the cooling performance for the capacitor module 500 can be improved.

  In the above-described embodiment, the motor housing is configured by the center bracket 909 and the housing 912 to form the flow path 919. However, the motor housing may be a single component. In addition, although AC bus bars 802U to 802W are directly connected to AC terminals 902U to 902W of rotating electrical machine 900, similar effects can be achieved with a configuration in which a connection is made via a cable instead of direct connection.

(2) Further, the flow path 19 includes flow path sections 19b and 19c provided in parallel so as to sandwich the capacitor module 500, and a flow path section 19a that communicates one end of the flow path sections 19b and 19c with each other. It is preferable that the storage space 405 is disposed in a region surrounded by the flow path sections 19a to 19c. Thus, by enclosing the storage space 405 in which the capacitor module 500 is disposed with the flow passage sections 19a to 19c, the heat dissipation effect from the capacitor module 500 to the refrigerant flowing through the flow passage 19 can be enhanced, and the power conversion device. Heat that enters the capacitor module 500 from around the 200 can be reduced.

  In the above-described embodiment, the power module is disposed in each of the three flow path sections 19a to 19c. However, two power modules may be disposed in the flow path section 19b and one in the flow path section 19c. Further, the present invention is not limited to three phases but can be similarly applied to the case of two phases or six phases.

(3) Further, on the outer periphery of the housing 912, a plurality of AC terminals 902U to 902W connected to the armature windings of the rotating electrical machine 900 are respectively arranged, and AC bus bars 802U to 802W provided in the power converter 200 are The power modules 300U to 300W extend from the power modules 300U to 300W so as to straddle the flow path 19, and are connected to the AC terminal in the outer area.

  The AC terminals 902U to 902W become high temperature due to the heat generated by the armature winding, and the temperature of the AC bus bars 802U to 802W connected to the AC terminals 902U to 902W also rises. However, since the connection portion is a region outside the region surrounded by the flow passage sections 19a to 19c, the radiant heat from the connection portion is blocked by the flow passage forming portion 12g, and the thermal influence on the capacitor module 500 is affected. Can be prevented.

(4) Further, the AC bus bars 802U to 802W connected to the AC terminals 902U to 902W are connected to the flow path forming portion 12g via the insulating sheet 950 that is an electrically insulating member in the outer region as shown in FIG. You may make it contact. By doing so, the AC bus bars 802U to 802W are cooled, and the temperature rise of the AC bus bars 802U to 802W and further the thermal influence on the capacitor module 500 due thereto can be reduced.

(5) Further, as shown in FIG. 26, when the power conversion device 200 is fixed to the housing 912, a vertical line drawn from the axial center of the rotating electrical machine 900 to the surface 912f of the housing 912 that the bottom surface portion 405f contacts with By crossing the bottom surface portion 405f, the distance between the bottom surface 500f and the flow path 919 is made more uniform in the bottom surface 500f, and the bottom surface 500f can be cooled more uniformly. In addition, since the average distance between the bottom surface 500f and the flow path 919 becomes smaller, the cooling efficiency of the flow path 919 by the refrigerant can be further increased.

(6) When the power modules 300U to 300W are arranged in the flow path 19 so that the bottom of the bottomed cylindrical module case 304 faces the housing fixing direction of the case 12, the power modules 300U to 300W Since the terminal or the like faces in the opposite direction to the bottom surface portion 405f, the bottom surface portion 405f can be easily brought into contact with the surface 912f of the housing 912.

(7) When the power conversion device 200 is attached to the housing 912 of the rotating electrical machine 900, the power conversion device 200 is configured to be fixed only to the housing 912, so that machining for ensuring the mounting surface accuracy is performed in the housing. Only 912 is required, and productivity is improved.

(8) The relay member 14a that is a communication pipe that connects the flow channel 919 and the flow channel 19 is provided, and the refrigerant supplied to the flow channel 19 is guided to the flow channel 919 via the relay member 14a. This simplifies the cooling system. In this case, the power conversion device 200 can be effectively cooled by disposing the flow path 19 on the upstream side of the refrigerant flow.

  The above description is merely an example, and when interpreting the invention, there is no limitation or restriction on the correspondence between the items described in the above embodiment and the items described in the claims. In addition, the present invention is not limited to the above embodiment as long as the characteristics of the present invention are not impaired. For example, in the embodiment described above, the flow path 19 is formed in a U-shape, but only the parallel flow paths such as the flow path sections 19b and 19c are provided, and the side where the pipes 13 and 14 are not provided. You may make it let an edge part penetrate to the outside of a case, and let both ends communicate with piping.

  DESCRIPTION OF SYMBOLS 1: Electric drive device, 12: Case, 12a-12d: Side wall, 12i: Through hole, 19,919, 919b, 919c: Channel, 19a-19c: Channel section, 20: Control circuit board, 22: Driver circuit Substrate, 136: battery, 140: inverter circuit, 200: power converter, 300U to 300W: power module, 304: module case, 405: storage space, 405a to 405d: side surface, 405f: bottom portion, 500: capacitor module, 507, 950: insulating sheet, 802, 802U to 802W: AC bus bar, 900: rotating electric machine, 902U to 902W: AC terminal, 908: front bracket, 909: center bracket, 910: rear bracket, 912: housing, 930: rotor , 940: Stator

Claims (8)

A rotating electrical machine having a rotor, a stator, and a housing in which a first refrigerant flow path is formed and holding the stator;
A power conversion device having an inverter circuit and fixed to the outer periphery of the housing, and an electromechanical integrated electric drive device comprising:
The power converter is
A smoothing capacitor provided on the DC input side of the inverter circuit;
An inverter case having a flow path forming portion formed with a second refrigerant flow path and a recess in which the smoothing capacitor is disposed;
A plurality of power semiconductor modules having a bottomed cylindrical module case in which a power semiconductor element for power conversion is housed, wherein at least a part of the module case is disposed in the second refrigerant flow path; Prepared,
The power converter is fixed to the housing so that the bottom surface of the recess in which the smoothing capacitor is disposed is in contact with the outer periphery of the housing. In the electromechanical integrated electric drive device according to claim 1,
The second refrigerant flow path communicates the first and second flow path sections provided in parallel so as to sandwich the smoothing capacitor and the opposite ends of the first and second flow path sections. A third flow path section,
The electromechanical integrated electric drive device, wherein the recess is disposed in a region surrounded by the first to third flow path sections. In the electromechanical integrated electric drive device according to claim 2,
A plurality of AC terminals connected to the armature winding of the rotating electrical machine are respectively arranged on the outer periphery of the housing,
The power conversion device includes a plurality of AC bus bars that connect the plurality of power conductor modules and the plurality of AC terminals,
Each of the AC bus bars extends from the power conductor module to an area outside the area surrounded by the flow path section so as to straddle the second refrigerant flow path, and in the outer area, An electromechanical integrated electric drive device characterized by being connected. In the electromechanical integrated electric drive device according to claim 3,
The plurality of AC bus bars are in contact with the flow path forming portion via an electrically insulating member in the outer region, and the electromechanically integrated electric drive device. The electromechanical integrated electric drive device according to any one of claims 1 to 4,
The power conversion device is fixed to the housing so that a perpendicular line drawn from an axial center of the rotating electrical machine to a housing contact surface with which the bottom surface portion contacts is fixed to the housing. Electric drive device. In the electromechanical integrated electric drive device according to any one of claims 1 to 5,
The power semiconductor module is disposed in the second refrigerant flow path so that a bottom portion of the bottomed cylindrical module case faces a housing fixing direction of the case. Electric drive device. The electromechanical integrated electric drive device according to any one of claims 1 to 6,
The rotating electrical machine includes a front bracket fixed to one axial end of the housing, and a rear bracket fixed to the other axial end of the housing,
The power conversion device is an electromechanical integrated electric drive device, wherein the power conversion device is fixed only to the housing. The electromechanical integrated electric drive device according to any one of claims 1 to 7,
A communication pipe communicating the first refrigerant channel and the second refrigerant channel;
The electric / electrically integrated electric drive device, wherein the refrigerant supplied to the second refrigerant flow path is led to the first refrigerant flow path through the communication pipe.

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