WO2013080747A1

WO2013080747A1 - Electromechanical electric drive device

Info

Publication number: WO2013080747A1
Application number: PCT/JP2012/078561
Authority: WO
Inventors: 和人大山; 宮崎　英樹; 勝洋星野; 鈴木　康介
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2011-11-28
Filing date: 2012-11-05
Publication date: 2013-06-06
Also published as: JP2013115903A

Abstract

In order to provide an electromechanical electric drive device that is capable of effective cooling by means of a capacitor module provided to a power conversion device, this electric drive device (1) is the result of integrating a rotary electric machine (900) and a power conversion device (200). A pathway (919) is formed at the rotary electric machine (900) by means of a center bracket (909) and a housing (912). The power conversion device (200) is affixed at the outer periphery of the housing (912). The case (12) of the power conversion device (200) is provided with a pathway forming section (12g) at which a pathway (19) and a housing space (405) at which the capacitor module (500) is disposed are formed. Also, the power conversion device (200) is affixed to the housing (912) in a manner so that the bottom surface section (405f) of the housing space (405) at which the capacitor module (500) is disposed contacts the outer periphery of the housing (912).

Description

Machine-electric integrated electric drive

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.

For example, Patent Document 1 discloses a machine-electric integral type electric drive apparatus 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 conversion device are integrally provided. There is what is described in. In the example described in Patent Document 1, in the case attached to the motor housing, the switching element power module, the smoothing capacitor, and the control board are disposed in this order from the case bottom side. The switching element power module is mounted on a heat sink provided in the case.

Unexamined-Japanese-Patent No. 2003-199363

However, in the machine-electric integrated type power converter that controls the rotating electric machine, not only the switching element power module but also the electronic components (especially, the smoothing capacitor which easily rises in temperature) used in the power converter are efficiently cooled It is desirable to do. For example, in an electric car traveling a vehicle with a rotational torque generated by a rotating electric machine, and a hybrid car traveling based on outputs of both an engine and a motor, the rotating electric machine attached with a power conversion device is housed in an engine room, Ambient temperature tends to be high.

The machine-electric integrated type electric drive apparatus according to the invention of claim 1 has a rotary electric machine having a rotor, a stator, and a housing in which a first refrigerant flow path is formed to hold the stator, and an inverter circuit. A mechanical-electrical integrated type electric drive device comprising a fixed power conversion device, the power conversion device comprising a smoothing capacitor provided on the DC input side of the inverter circuit, a second refrigerant flow path, and a smoothing An inverter case having a flow path forming portion in which a concave portion in which a capacitor is disposed is formed, and a bottomed cylindrical module case accommodating a power semiconductor element for power conversion, at least a part of the module case And a plurality of power semiconductor modules disposed in the second refrigerant flow path, and the power conversion device includes a bottom surface portion of the concave portion in which the smoothing capacitor is disposed. Characterized in that it is fixed to the housing so as to contact the outer periphery of the grayed.

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 rotation electrical machinery.

FIG. 2 is a view showing a control block of a hybrid vehicle equipped with the electric drive device of the present embodiment. FIG. 2 is a block diagram for explaining a power conversion device 200. It is a figure explaining the composition of the electric circuit of inverter circuit 140. FIG. It is an external appearance perspective view of the electric drive 1 in this embodiment. FIG. 5 is a perspective view showing a state in which rotating electrical machine 900 and power conversion device 200 are separated. FIG. 5 is a perspective view showing a state in which rotating electrical machine 900 and power conversion device 200 are separated. FIG. 10 is a cross-sectional view of a rotary electric machine 900. FIG. 2 is a view showing the flow of a refrigerant in the electric drive device 1; FIG. 6 is an exploded perspective view of the power conversion device 200. FIG. 6 is an exploded perspective view of the power conversion device 200. FIG. 7 is a plan view of a case 12; It is a figure which shows the bottom side of case 12. As shown in FIG. It is the perspective view which looked at case 12 from the bottom side. It is a perspective view of power module 300U. It is a perspective view of power module 300U. It is a circuit diagram showing the circuit composition of power module 300U. FIG. 6 is an external perspective view of a capacitor module 500. FIG. 6 is an external perspective view of a capacitor module 500. FIG. 14 is a plan view showing a state in which power modules 300U to 300W, a capacitor module 500, and an AC bus bar 802 are attached to case 12; FIG. 17 is a perspective view showing in detail the connection between the terminals of power modules 300U-300W and AC bus bars 802U-802W. FIG. 10 is a cross-sectional view showing a power conversion device 200 and a part of a rotating electrical machine 900 to which the power conversion 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 case 12 and the lid 8 from the power converter device 200. FIG. FIG. 6 is a horizontal sectional view of the case 12 at the centers of the inlet pipe 13 and the outlet pipe 14; It is a schematic diagram for demonstrating arrangement | positioning of power modules 300U-300W. It is the figure which cut the electric drive 1 perpendicularly to the direction of an axis.

Hereinafter, an embodiment of 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 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. When the rotary electric machine 900 is mounted on a car, it is desirable to obtain a small size and high output, and a permanent magnet synchronous motor using a magnet such as neodymium is suitable. Further, 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 on the output side of the engine EGN is transmitted to the rotary electric machine 900 via the power distribution mechanism TSM. The rotational torque from the power distribution mechanism TSM or the rotational torque generated by the rotary electric machine 900 is transmitted to the wheels via the transmission TM and the differential gear DEF. On the other hand, during the 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 power is used again as traveling 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 direct current connector (not shown), and power exchange between the battery 136 and the inverter circuit 140 is performed. When the rotary electric machine 900 is operated 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 rotating electric machine 900 via AC bus bars 802 (802U to 802W).

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

Although not shown in FIG. 1, the battery 136 is also used as a power source for driving a motor for the accessory. Examples of the auxiliary motor include a motor that drives a compressor of an air conditioner, and a motor that drives a hydraulic pump for control. DC power is supplied from the battery 136 to the accessory power module, and the accessory power module 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 capacitor module 500 for smoothing DC power supplied to inverter circuit 140.

The power conversion device 200 includes a communication connector 21 for receiving a command from a higher control device (not shown) or transmitting data representing a state to the higher control device. The power conversion device 200 calculates the control amount of the rotary electric machine 900 by the control circuit 172 based on the command input from the connector 21. Furthermore, the power conversion device 200 calculates whether to operate as a motor or to operate as 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 drive 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, an insulated gate bipolar transistor is used as a semiconductor element, and hereinafter abbreviated as IGBT. A series circuit 150 of the upper and lower arms is configured by the IGBT 328 and the diode 156 operating as the upper arm, and the IGBT 330 and the diode 166 operating as the lower arm. 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.

These three phases correspond to the three-phase windings of the armature winding of the rotary electric machine 900 in this embodiment. A series circuit 150 of upper and lower arms of each of the three phases 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 through an AC terminal 159 to an AC bus bar 802 described below, which is an AC power line to the rotary electric 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 lower arm IGBT 330 is electrically connected to the capacitor terminal 504 on the negative electrode side of the capacitor module 500 through 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 this, and supplies it to the driver circuit 174. The control pulse is a control signal for controlling the IGBT 328 or IGBT 330 which constitutes the upper arm or the lower arm of the series circuit 150 of each phase provided in the inverter circuit 140.

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 IGBTs 328 and IGBTs 330 conduct or cut off 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 power is supplied to the rotating electric machine 900.

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

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

The capacitor module 500 includes a positive side capacitor terminal 506, a negative side capacitor terminal 504, a positive side power supply terminal 509, and a negative side power supply terminal 508. The battery 136 is connected to the

power supply terminals

509 and 508, and high voltage DC power is input from the battery 136 and is output to the inverter circuit 140 from the

capacitor terminals

506 and 504.

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, and supplied from the

power terminals

509 and 508 to the battery 136 via the DC connector 138. It is accumulated.

The control circuit 172 includes a microcomputer (hereinafter referred to as a “microcomputer”) for arithmetically processing the switching timing of the IGBT 328 and the IGBT 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 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 rotary electric machine 900. In the present embodiment, the case where the current sensor 180 detects current values of three phases is taken as an example, but current values of two phases may be detected and currents of three phases may be obtained by calculation. .

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. Then, 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, and the generated modulation 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 IGBT 330 of the corresponding lower arm. Also, when driving the upper 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 uses it as a drive signal to drive the corresponding upper arm. Output to the gate electrodes of the IGBTs 328 of FIG.

The microcomputer in the control circuit 172 performs abnormality detection (overcurrent, overvoltage, overtemperature, etc.) to protect the series circuit 150. Therefore, sensing information is input to the control circuit 172. For example, from the emitter electrode 155 for signals of each arm and the emitter electrode 165 for signals, information of the current flowing to the emitter electrodes of the IGBTs 328 and IGBTs 330 is input to the corresponding driver (IC). Thus, each drive unit (IC) performs overcurrent detection, and when an overcurrent is detected, stops the switching operation of the corresponding IGBT 328 and IGBT 330 and protects the corresponding IGBT 328 and IGBT 330 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. Also, information on the voltage 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 the switching operation of all the IGBTs 328 and IGBTs 330 when the over temperature or the over voltage is detected.

FIG. 4 is an external perspective view of the electric drive device 1 in the present embodiment. The electric drive device 1 has an integrated structure of the rotary electric 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 conversion device 200 are separated. Although details will be described later, 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.

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

The case 12 in which the circuit component which comprises the power converter device 200 is accommodated has comprised substantially cubic shape, and the cover 8 is being fixed to the upper opening part. Although details will be described later, a channel for flowing the cooling medium is formed in the case 12, and an inlet pipe 13 for introducing 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

openings

12 h and 8 a (see FIGS. 5 and 6) formed in the side wall 12 b of the case 12 and the lid 8.

As shown in FIG. 5, the

AC terminals

902U, 902V and 902W of the rotary electric machine 900 are disposed on the mounting surface 912e of the housing 912 to which the case 12 is fixed, and the concave shape is adjacent to the

AC terminals

902U, 902V and 902W. The flat surface 912 f of the When the case 12 is fixed to the housing 912, the bottom surface portion 405f formed on the bottom surface side of the case 12 is in contact with the surface 912f. In addition, it is good also as a structure which contacts indirectly, sandwiching a thermal radiation sheet | seat, grease, etc. As shown in FIG. 6, the bottom surface portion 405f is formed to project further than the lower ends of the side walls 12a to 12d provided on four sides of the case 12. A lower cover 420 covers the bottom side of the flow path.

As described above, in the present embodiment, when the power conversion device 200 and the rotary electric machine 900 are integrated, the case 12 of the power conversion device 200 contacts only the housing 912 of the rotary electric machine 900. Therefore, on the side of the rotary electric machine 900, machining for securing the attachment surface accuracy may be performed only on the housing 912, and the other front brackets 908 and rear brackets 910 become unnecessary, thereby improving productivity.

The bottom surface side of the case 12 is formed with a surface 12 e which is recessed from the bottom surface portion 405 f separately from the above-described bottom surface portion 405 f. A through hole 12i is formed in the surface 12e, and the AC bus bars 802U, 802V, 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 rotary electric machine 900. A stator 940 provided with armature windings for three phases is fixed to a center bracket 909. 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 940. The center bracket 909 is housed inside the housing 912, and the grooves of the center bracket 909 and the inner peripheral surface of the housing 912

form flow paths

919b and 919c. The flow path 919 b and the flow path 919 c are connected to form one connected flow path 919. That is, the center bracket 909 and the housing 912 form a motor housing having a flow passage 919. Then, the stator 940 is cooled by the refrigerant by holding the stator 940 on the inner peripheral side of the motor housing provided with such a flow path. AC terminals 902U to 902W are provided so as to project from surface 912e of housing 912, to which corresponding armature windings of stator 940 are connected.

FIG. 8 is a view showing the flow of the refrigerant in the electric drive device 1, and the arrow shows 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 having flowed through the flow path of the case 12 is discharged from the outlet pipe 14. The outlet pipe 14 is connected to the inlet pipe 913 provided on the outer periphery of the housing 912 of the rotary electric machine 900 via the relay member 14 a, and the refrigerant discharged from the outlet pipe 14 is shown in FIG. It flows into the flow path 919b. Then, the refrigerant flows in the order of the flow path 919b and the flow path 919c, and is discharged from the 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 rotary electric machine 900, thereby cooling the circuit components and the rotary electric machine 900 provided in the case 12 and the stator of the rotary electric machine 900. 940 is cooled. In the present embodiment, as shown in FIG. 8, the flow of the refrigerant is connected from power conversion device 200 to rotary electric machine 900 by using relay member 14a which is a communication pipe, but relay member 14a is used. There is no problem in causing the refrigerant to flow in and out individually to each of the power conversion device 200 and the rotary electric machine 900. In addition, as the refrigerant, for example, water, LLC (long life coolant: antifreeze liquid) is often used, but in the following, it will be described as cooling water

Next, the detailed structure of power converter 200 will be described. 9 and 10 are exploded perspective views of the power conversion device 200. FIG. The case 12 is a rectangular solid having a substantially square planar shape, and an upper storage space for storing the control circuit board 20, the driver circuit board 22, the AC bus bars 802U, 802V, 802W, etc., and a flow path forming portion 12g are formed. And a lower storage space. The control circuit 172 shown in FIG. 2 is mounted on the control circuit board 20 having the connector 21, and the 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 top opening of the case 12 is covered by a lid 8.

Openings

8a and 12h for the connector 21 are formed in the lid 8 and the case 12 as shown in FIG. Low voltage DC power for operating the control circuit in the power conversion device 200 is supplied from the connector 21.

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

pipes

13 and 14 are provided is formed in a step-like shape.

FIG. 11 is a plan view of the case 12, and FIG. 12 is a view showing the bottom side of the case 12. As shown in FIG. FIG. 13 is a perspective view of the case 12 as viewed from the bottom side. On the upper surface side of the flow path forming portion 12g in which the flow path 19 is formed, three openings 402a to 402c communicating with the flow path 19 are formed.

Power modules

300U, 300V, 300W incorporating the electronic components constituting the series circuit 150 of FIG. 3 are inserted into the flow path 19 from the openings 400a to 400c (see FIG. 9). The power module 300U incorporates the U-phase series circuit 150, the power module 300V incorporates the V-phase series circuit 150, and the power module 300W incorporates the W-phase series circuit 150. These three power modules 300U to 300W have the same configuration, and the external shape is also the same. The openings 402a to 402c are closed by the flanges of the inserted power modules 300U to 300W.

A storage space 405, which is a recess for storing the capacitor module 500, is formed at the center of the flow path forming portion 12g. The storage space 405 is formed so as to be surrounded by a U-shaped flow passage 19. The side surfaces 405a to 405d of the storage space 405 are formed to be substantially in contact with the side surfaces of the capacitor module 500 disposed on the bottom surface portion 405f. The condenser 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 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. The direct

current terminals

509 and 508 provided in the capacitor module 500 protrude from 12j of the case 12 and are connected to the battery 136 by direct current wiring (not shown).

As shown in FIGS. 12 and 13, a U-shaped opening 404 is formed on the lower surface 12 e of the flow path forming portion 12 g along the flow path 19. 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 to maintain airtightness. 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 channel 19 having a U-shape is divided into three

channel sections

19a, 19b and 19c depending on the flow direction of the cooling water. Although the details will be described later, the first flow passage section 19a is provided along the side wall 12a opposite to the side wall 12d provided with the

pipes

13, 14 and the second flow passage section 19b is 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 19 b is in communication with the communication passage 12 k to which the inlet pipe 13 is attached. The downstream flow passage section 19 c communicates with the communication passage 12 m 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, and flows in the order of the flow path section 19b, the flow path section 19a, and the flow path section 19c as shown by the broken arrow. It is drained.

The opening 402a described above is formed at a position facing the flow passage section 19a on the upper surface of the flow passage forming portion so that the longitudinal direction is parallel to the side wall 12a. The opening 402 b is formed at a position facing the flow passage section 19 b on the upper surface of the flow passage forming portion so that the longitudinal direction is parallel to the side wall 12 b. The opening 402 c is formed at a position facing the flow passage section 19 c on the upper surface of the flow passage forming portion so that the longitudinal direction is parallel to the side wall 12 c. 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 a projection 406 projecting in the direction of the bottom of the case 12 at a position facing the above-described openings 402a to 402c. As can be seen from FIG. 9, these convex portions 406 are concave 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 concaves. 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 disposed above the capacitor module 500 and in the upper storage space of the case 12. One end of each of the AC bus bars 802U to 802W is connected to the AC terminal 320B of the corresponding power module, and the other end is an AC provided in the mounting surface 912e of the housing 912 through the through hole 12i formed in the flow path forming portion 12g. It is connected to the terminals 902U to 902W (see FIG. 5). In the portion of through hole 12i, insulating sheet 950 is provided between AC bus bars 802U to 802W and flow path forming portion 12g. The alternating current bus bars 802U to 802W can measure the current value by a current sensor 180 (not shown).

Depending on the operating condition of the rotary electric machine 900, the heat from the AC terminals 902U to 902W of the rotary electric machine 900 may be transferred to the AC bus bars 802U to 802W, and the AC bus bars 802U to 802W may be heated to a high temperature. However, in the present embodiment, the AC bus bars 802U to 802W pass through the through holes 12i provided not between the flow path 19 and the storage space 405 but between the side wall 12a of the flow path forming portion 12g and the flow path 19. It is connected to the AC terminals 902U to 902W of the rotary electric machine 900. Therefore, the influence of heat transferred from AC terminals 902U to 902W on capacitor module 500 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 manner, power modules 300U to 300W, driver circuit board 22 and control circuit board 20 are arranged hierarchically in the case height direction, and control circuit board 20 is farthest from power modules 300U to 300W of high-power system. Since the circuit is disposed, the mixing of switching noise and the like on the control circuit board 20 side can be reduced. The case 12 is formed of a metal material such as aluminum.

The detailed configuration of the power modules 300U to 300W used for the inverter circuit 140 will be described with reference to FIGS. 14 to 16. The power modules 300U-300W all have the same structure, and the structure of the power module 300U will be representatively described. 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 direct current positive electrode terminal 315B is the same as the positive electrode terminal 157 disclosed in FIG. 3, and the direct current negative electrode terminal 319B is the same as the negative electrode 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 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 the conductor plate 315. Similarly, the collector electrode of the lower arm IGBT 330 and the cathode electrode of the lower arm diode 166 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 the conductor plate 318. Similarly, the emitter electrode of the lower arm IGBT 330 and the anode electrode of the lower arm diode 166 are connected via the conductor plate 319. The

conductor plates

318 and 320 are connected by an intermediate electrode 329. An upper and lower arm series circuit is formed by such a circuit configuration.

In the 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 which constitute the series circuit 150 of the upper and lower arms shown in FIG. 166) is stored. A sealing resin 351 is filled in a gap in the module case 304, and the power semiconductor elements and the like contained therein are sealed by the sealing resin 351.

The module case 304 is made of a member having electrical conductivity, such as an aluminum alloy material (Al, AlSi, AlSiC, Al-C, etc.), and is integrally molded in a jointless state. The bottomed cylindrical module case 304 has a structure in which no opening is provided other than the insertion port 306, and the insertion port 306 is formed with a flange 304B. Further, as shown in FIGS. 14 and 15, the opposing wide surfaces of the flat module case 304 constitute a first heat radiating surface 307A and a second heat radiating surface 307B. A plurality of fins 305 are formed on the first heat radiating surface 307A and the second heat radiating surface 307B so as to be uniformly distributed.

The power semiconductor elements (IGBT 328, IGBT 330, diode 156, diode 166) in the module case 304 are disposed to face the

heat dissipation surfaces

307A and 307B. Three surfaces (two side surfaces and a bottom surface) connecting the first heat radiating surface 307A and the second heat radiating surface 307B are narrower than the first heat radiating surface 307A and the second heat radiating surface 307B. The shape of the module case 304 does not have to be an accurate rectangular parallelepiped, and the corner portion may have a curved surface as shown in FIGS.

By using a metal case of such a shape, even if 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. A medium can be prevented from invading the inside of the module case 304 with a simple configuration.

On the outside of the insertion opening 306 of the module case 304, a metal DC positive electrode wire 315A and a DC negative electrode wire 319A for electrically connecting to the capacitor module 500 are provided. 157) and a direct current negative electrode terminal 319B (158). In addition, a metal AC wire 320A for supplying AC power to the rotary electric machine 900 is provided, and an AC terminal 320B (159) is formed at the tip thereof.

Furthermore,

metal signal wires

324U and 324L for electrically connecting with the driver circuit 174 are provided outside the insertion port 306, and the signal terminals 325U (154, 155) and the signal terminals are provided at the tip thereof. 325L (164, 165) are respectively 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 direct current positive wiring 315A, the direct current negative wiring 319A, the alternating current wiring 320A, the signal wiring 324U and the signal wiring 324L are integrally molded as the auxiliary mold body 600 in a state of being mutually insulated by the wiring insulating portion 608 molded of resin material. Be done. The wire insulating portion 608 also functions as a support member for supporting each wire, and the resin material used for this is suitably a thermosetting resin or a thermoplastic resin having insulation. As a result, the insulation between the DC positive wiring 315A, the DC negative wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L can be secured, and high density wiring can be achieved.

One end of the DC positive wire 315A, the DC negative wire 319A, the AC wire 320A, the signal wire 324U and the signal wire 324L of the auxiliary mold body 600 is metal-joined to the upper and lower arm series circuit as shown in FIG. For this metal bonding, for example, TIG welding can be used. In the integrally molded auxiliary mold body 600, the wiring insulating portion 608 is fixed to the module case 304 by the screw 309.

Thereafter, the sealing resin 351 is filled in the gap in the module case 304, 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. As a result, a necessary insulation distance can be stably secured between the connection portion and the module case 304, so that the power module 300U can be miniaturized as compared with the case where the sealing is not performed.

17 and 18 are external perspective views of the capacitor module 500. FIG. In the capacitor module 500, a plurality of capacitor cells are provided. Capacitor terminals 503 a to 503 c are provided on the top surface of the capacitor module 500 so as to protrude. The capacitor terminals 503a to 503c are provided to correspond to the positive electrode terminal 157 and the negative electrode terminal 158 of each 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 electrode side capacitor terminal 504 and the positive electrode side capacitor terminal 506 which constitute each of the capacitor terminals 503a to 503c, and insulation between the terminals is secured.

Power supply terminals 508 (N) and 509 (P) are provided on the side surface 500 d side of the capacitor module 500. 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

side surfaces

405a, 405b, 405c, and 405d of the storage space 405 of the flow path forming portion 12g. To face.

FIG. 19 is a plan view showing a state in which power modules 300U to 300W, capacitor module 500, and AC bus bar 802 are attached to case 12. As shown in FIG. The capacitor module 500 is accommodated in the accommodation space 405, and the power modules 300U to 300W are inserted into the openings 402a to 402c of the flow path forming portion 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.

FIG. 20 shows a connection portion 805 of DC positive electrode terminal 315B, DC negative electrode terminal 319B and AC terminal 320B of power modules 300U to 300W, positive electrode side capacitor terminal 506, negative electrode side capacitor terminal 504 of capacitor module 500, and AC bus bars 802U to 802W. 4 is a perspective view showing in detail the connection state of FIG. At the connection between each of the power modules 300U to 300W and the capacitor module 500, the DC positive electrode terminal 315B is welded to the positive electrode side capacitor terminal 506, and the DC negative electrode terminal 319B is welded to the negative electrode side capacitor terminal 504. Further, at the connection portion between power modules 300U-300W and AC bus bars 802U-802W, AC terminal 320B is welded to connection portion 805 of the bus bar. The tips of the DC positive terminal 315B, the DC negative terminal 319B, the positive side capacitor terminal 506, the negative side capacitor terminal 504, and the connecting portion 805 have a concavo-convex shape, and such a shape that heat is concentrated on the concavo-convex portion during welding. It has become.

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

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 the power modules 300U to 300W (upper storage space), and are soldered or the like. It is connected. Thus, the gate electrode 154 and the signal emitter electrode 155 of the upper arm and the gate electrode 164 and the signal emitter electrode 165 of the lower arm shown in FIG. 3 are connected to the driver circuit 174.

As shown in FIGS. 19 and 20, the AC bus bars 802U to 802W are connected to the AC terminals 320B of the power modules 300U to 300W to which the connection parts 805 provided at their one ends correspond. These AC bus bars 802U to 802W are extended from the AC terminals 320B of the power modules 300U to 300W toward the through holes 12i formed in the flow path forming portion 12g as shown in FIGS. It is bent in an L-shape toward the bottom of the case 12 at the portion of the hole 12i. The end portions of the bent alternating current bus bars 802U to 802W are fixed to the alternating current terminals 902U to 902W by bolts 905.

As shown in FIG. 22, three-phase armature windings of the rotary electric machine 900 are connected to the 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 may be twisted by heat transfer from the three phase armature winding. is there.

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

Further, in the present embodiment, in the region of through hole 12i shown in FIG. 21, alternating current bus bars 802U to 802W are brought into contact with flow path forming portion 12g via an insulating member such as insulating sheet 950. With such a structure, even if heat is transferred from the three-phase armature winding of the rotary electric machine 900, the heat is transferred from the flow path forming portion 12g in contact to the cooling water flowing in the flow path 19. Thus, the temperature rise of the AC bus bars 802U to 802W can be suppressed.

In the present embodiment, for convenience of arrangement of AC terminals 902U to 902W, AC bus bars 802U to 802W are indirectly contacted with flow path forming portion 12g outside flow path 19 in the portion where power module 300V is arranged. However, the contact location is not limited to this. For example, when the positions of the alternating current terminals 902U to 902W are on the side wall 12b side, through holes for passing the alternating current bus bars 802U to 802W are formed on the outside of the opening 402b. Make it That is, the connection between the AC bus bars 802U to 802W and the AC terminals 902U to 902W is performed outside the flow path 19.

In this embodiment, the substantially L-shaped alternating current bus bars 802U to 802W are respectively formed as one member, but a plurality of members may be connected. In addition, there is no problem in passing through the current sensor 180 and the like (not shown). In general, the AC bus bars 802U to 802W are likely to become hot because current flows for driving the rotary electric machine 900, and the peripheral members may be affected by heat. In particular, since the capacitor module 500 is not directly disposed in the cooling water of the flow path 19 as in the power modules 300U to 300W, attention must be paid to thermal effects.

The side surfaces 500a to 500c of the capacitor module 500 are close to and opposed to the side surfaces 405a to 405c near the flow path 19, respectively. Therefore, the heat radiation from the side surfaces 500a to 500c is effectively performed, but the other surfaces of the capacitor module 500 are inferior in heat radiation.

Therefore, in the present embodiment, in order to further improve the cooling performance of capacitor module 500, the outer peripheral surface of bottom portion 405f with which bottom surface 500f of capacitor module 500 is in contact is cooled by cooling water of housing 912. The mounting surface 912 e is more in contact with the surface 912 f formed on the mounting surface 912 e. 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 horizontal sectional view of the case 12 in which the power modules 300U to 300W and the capacitor module 500 are disposed, at the centers 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 flow path section 19b formed along the side wall 12b on the left side of the figure has a U phase A power module 300U is disposed. Similarly, a V-phase power module 300V is disposed in the flow path section 19a formed along the side wall 12a opposite to the side wall 12d on which the inlet pipe 13 and the outlet pipe 14 are provided, on the right side wall 12c. The W-phase power module 300W is disposed in the flow passage section 19c formed along the same.

In the present embodiment, a 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 arranged in the flow path sections 19a to 19c. At the time of arrangement, flat power modules 300U to 300W are arranged in parallel to the side walls 12a to 12c. Then, the capacitor module 500, which is an electrical component, is stored in the central region (storage space 405) surrounded by the flow path 19. Such an arrangement makes it possible to miniaturize the case 12 in which the power modules 300U to 300W and the capacitor module 500 are housed, and has the effect of facilitating the attachment of the rotary electric machine 900 to the housing 912.

When three power modules 300U to 300W are arranged in a U-shape, as shown in FIG. 24, at least one of power modules 300V arranged between a pair of

power modules

300U and 300W arranged in parallel. The size can be further reduced by arranging the parts so as to enter the area sandwiched between the

power modules

300U and 300W.

FIG. 25 is a schematic diagram for explaining the arrangement of 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 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 adjust the dimensions slightly in consideration of the flow of the cooling water such as the connecting portion of the flow path section.

Therefore, when trying to make the installation area of power conversion device 200 as small as possible, it is conceivable to achieve size reduction of power conversion device 200 by making the shape (planar shape) when viewed in a plan view into a substantially square. . As described above, since a communication passage is required for the direction along the

side walls

12b and 12c, from the viewpoint of miniaturization, as shown in FIG. 25, the power module is disposed in the region S1 between the pair of

power modules

300U and 300W. It is preferable to arrange the power module 300V so that a part of 300V is included.

The lateral dimension (width dimension of the side wall 12 a) of the arrangement space in FIG. 25 is at least about L 1 + 2 · L 3, where L 3 is the thickness of the power module. Therefore, if L3 and L4 are set so that the longitudinal dimension L1 + L2 + (L3-L4) becomes almost the same as L1 + L3, the area in plan view can be made smaller and it can be made substantially square Become. At this time, the flow passage section 19a is formed to pass through the region between the

power modules

300U and 300W as shown in FIG. In the example shown in FIG. 24, the distance between the

power modules

300U and 300W is slightly larger than the dimension L1 of the power module 300V due to the restriction by the dimensions of the capacitor module 500.

By concentrating the positions of the

pipes

13 and 14 in one side wall 12 d, the flow of cooling water from the inlet pipe 13 to the flow path section 19 b and the flow path from the flow path section 19 c to the outlet pipe 14 becomes linear. Can be made as small as possible. Moreover, while being able to suppress that the installation space of the apparatus by protrusion of piping becomes large, the improvement of a vehicle-mounted property can be aimed at. Furthermore, when the

pipes

13 and 14 are press-fit into the

communication paths

12k and 12m, since the press-fitting operation is performed on only one surface of the housing, workability and productivity are improved.

Moreover, 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 cooled effectively. By the way, the electric drive 1 is generally disposed in the engine room in many cases. Since the inside of the engine room becomes relatively high temperature due to the heat from the engine, the rotating electric machine 900 and the like, heat intrusion from the surroundings to the power conversion device 200 becomes a problem. However, as shown in FIG. 24, since the capacitor module 500 is surrounded on three sides by the flow path 19 through which the cooling water flows, it is possible to effectively block heat intrusion from the periphery of the apparatus. Furthermore, when attaching the power conversion device 200 to the housing 912 of the rotary electric machine 900, the outer peripheral surface of the bottom surface portion 405f on which the capacitor module 500 is mounted is brought into contact with the housing 912 in which the 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 1 perpendicular to the axial direction, 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 on the module case 304 of the power modules 300U to 300W. In the power modules 300U to 300W, the

heat dissipation surfaces

307A and 307B on which the fins 305 for heat dissipation are formed are disposed 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 recess of 406. Thereby, it is possible to prevent the cooling water from flowing into the space where the fins 305 are not formed, and it is possible to prevent the lowering of the cooling effect.

In the machine-electric integrated electric drive device 1 of the present embodiment, as shown in FIG. 26, the relatively heavy capacitor module 500 is disposed at the lower center of the power conversion device 200. Therefore, the center-of-gravity balance of the power conversion device 200 is good, and when vibration is applied, the power conversion device 200 part is hard to go wild, which is very suitable for the mechanical-electrical integrated structure.

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

With the cooling structure as shown in FIG. 26, the bottom surface 500f not facing the flow path 19 of the capacitor module 500 is cooled by the cooling water flowing in the

flow paths

919b and 919c of the housing 912 housing the rotary electric machine 900. be able to. That is, the capacitor module 500 can perform double cooling 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

919 b and 919 c of the rotary electric machine 900.
As a result, the cooling effect of the capacitor module 500 is improved.

Next, the mounting position of the power converter 200 on the housing 912 will be described with reference to FIGS. In the present embodiment, when the power conversion device 200 is attached in the radial direction of the rotary electric machine 900 as described above, the bottom surface portion 405 f of the case 12 is in contact with the surface 912 f of the housing 912. As shown in FIG. 26, the flow passage 919 of the housing 912 is formed in a ring shape in the circumferential direction of the housing 912, and a part of the heat of the capacitor module 500 passes through the bottom portion 405f and the surface 912f as shown by arrow H. The heat is dissipated to the cooling water of the flow path 919. Therefore, in order to cool the capacitor module 500 more suitably, the distance in the radial direction between the bottom portion 405f of the case 12 and the axis J of the rotary electric machine 900 is reduced as close as possible to the flow path 919 of the housing 912. Is good. At this time, it is necessary to cool the bottom surface 500f of the capacitor module 500 in a 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 rotary electric machine 900 be small.

Therefore, case 12 so that the position of the central axis of rotating electric machine 900 (the foot of the perpendicular drawn from axis J of rotating electric machine 900 to surface 912f) enters the contact area between surface 912f and bottom portion 405f of case 12. May be secured to the housing 912. More preferably, the central position of the bottom surface portion 405f (the central position with respect to the horizontal position in FIG. 26) coincides with the position of the axis J of the rotary electric machine 900. 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 rotary electric machine 900. As a result, the cooling balance in the bottom surface 500 f of the capacitor module 500 is improved.

As described above, among the six sides of the capacitor module 500, the three side surfaces 500a to 500c are cooled by the cooling water of the flow path sections 19a to 19c, and the bottom surface 500f is cooled using the cooling water flowing through the housing 912 can do. And when it considers regarding the remaining two

faces

500g and 500d (refer to Drawing 17), it becomes as follows.

First, in order to cool the side surface 500d, the side wall 12d of the case 12 needs to be fixed to the mounting surface 912e provided on the housing 912. However, since the side wall 12d is provided with the inlet pipe 13 and the outlet pipe 14 for the cooling water, this is an obstacle when attaching the case 12 to the housing 912, and can not be said to be the best choice. Therefore, the side surface 500d of the capacitor module facing the side wall 12d is not suitable for double cooling (cooling by the coolant in the flow path 19 and cooling by the coolant in the flow path 919).

Further, on the upper side of the surface 500g, the driver circuit board 22 and the control circuit board 20, the

signal terminals

325U and 325L and the direct current positive terminal 315B of the auxiliary molded body 600, the direct current negative terminal 319B, the alternating current terminal 320B, and the alternating current bus bar 802U. -802 W etc. are arranged. Therefore, it is difficult to bring the surface 500g into direct or indirect contact 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, in the case of the bottom surface 500f of the capacitor module 500, since it is in contact with the bottom surface portion 405f of the case 12, the surface 912f of the housing 912 can be easily contacted via the bottom surface portion 405f. This is because, in power conversion device 200 of the present embodiment, the shape of three power modules 300U to W is flat, and power modules 300U to 300W are side walls 12a to 12c of 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 405 f of the case 12 and the lower cover 420 can be disposed on the bottom surface 500 f side of the capacitor module 500. As a result, by causing the outer peripheral surface of the bottom surface portion 405 f to project lower than the convex portion 406 of the lower cover 420, the housing 912 of the rotary electric machine 900 can be easily brought into contact with it. It can be cooled using the cooling water flowing through.

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

(1) The electric drive device 1 has the rotary electric machine 900 having the motor housing (center bracket 909, housing 912) having the rotor 930, the stator 940, and the flow path 919 formed therein and holding the stator 940, and the inverter circuit 140. And a power converter 200 fixed to the outer periphery of the housing 912. Power conversion device 200 has a flow in which smoothing capacitor module 500 provided on the DC input side of inverter circuit 140 and storage space 405 which is a recess in which flow path 19 and capacitor module 500 are arranged are formed. A plurality of cases 12 having a case 12 having a passage forming portion 12 g and a bottomed cylindrical module case 304 containing a power semiconductor element for power conversion, wherein at least a part of the module case 304 is disposed in the flow path 19 The power conversion device 200 is fixed to the housing 912 such 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 passage 19 of the flow passage forming portion 12g, and is also cooled by the refrigerant flowing through the flow passage 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 embodiment described above, although the motor housing is configured by the center bracket 909 and the housing 912 to form the flow passage 919, the motor housing may be one component. In addition, although the AC bus bars 802U to 802W are directly connected to the AC terminals 902U to 902W of the rotary electric machine 900, the same function and effect can be achieved by a configuration in which the connection is made via a cable instead of direct connection.

(2) Further, the flow path 19 includes the

flow path sections

19b and 19c provided in parallel to sandwich the capacitor module 500, and the flow path section 19a connecting the opposite ends of the

flow path sections

19b and 19c. The storage space 405 is preferably arranged in the area surrounded by the flow path sections 19a to 19c. As described above, by surrounding the storage space 405 in which the capacitor module 500 is disposed by the flow path sections 19a to 19c, the heat dissipation effect from the capacitor module 500 to the refrigerant flowing in the flow path 19 can be enhanced, and the power converter Heat entering the capacitor module 500 from around 200 can be reduced.

In the embodiment described above, the power modules are arranged in each of the three flow path sections 19a to 19c, but two power supply sections may be arranged in the flow path section 19b and one may be arranged in the flow path section 19c. Further, the present invention can be applied not only to three phases but also to two phases or six phases.

(3) Furthermore, on the outer periphery of the housing 912, a plurality of AC terminals 902U to 902W connected to the armature winding of the rotary electric machine 900 are respectively disposed, and the AC bus bars 802U to 802W provided in the power conversion device 200 are The power modules 300U-300W extend from the power modules 300U-300W across the flow path 19 to an area outside the area surrounded by the flow path sections 19a-19c, and are connected to the AC terminals in the outer area.

The AC terminals 902U to 902W become high temperature due to heat generation of the armature winding, and the temperatures of the AC bus bars 802U to 802W connected to the AC terminals 902U to 902W also rise. However, since the connection portion is a region outside the region surrounded by the flow path sections 19a to 19c, the radiant heat from the connection portion is blocked by the flow path formation portion 12g, and the thermal influence on the capacitor module 500 is It can be prevented.

(4) Further, as shown in FIG. 21, in the area outside the AC bus bars 802U to 802W connected to the AC terminals 902U to 902W, the flow path forming portion 12g via the insulating sheet 950 which is an electrically insulating member. You may make it contact. By so doing, AC bus bars 802U to 802W can be cooled, and the temperature rise of AC bus bars 802U to 802W and the thermal effect on capacitor module 500 due to the temperature rise can be reduced.

(5) Furthermore, as shown in FIG. 26, when fixing the power conversion device 200 to the housing 912, the perpendicular drawn from the shaft core of the rotating electrical machine 900 to the surface 912f of the housing 912 which the bottom surface portion 405f contacts. By intersecting the bottom surface portion 405f, the distance between the bottom surface 500f and the flow path 919 can be made more uniform in the bottom surface 500f, and the bottom surface 500f can be cooled more uniformly. Further, since the average distance between the bottom surface 500 f and the flow path 919 is also smaller, the cooling efficiency of the flow path 919 by the refrigerant can be further enhanced.

(6) Further, 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 attaching the power conversion device 200 to the housing 912 of the rotary electric machine 900, the power conversion device 200 is fixed only to the housing 912 so that machining for securing the mounting surface accuracy is a housing Productivity can be improved by performing only 912.

(8) The relay member 14a, which is a communication pipe connecting the flow passage 919 and the flow passage 19, is provided, and the refrigerant supplied to the flow passage 19 is led to the flow passage 919 through the relay member 14a. This simplifies the cooling system. In this case, by arranging the flow path 19 on the upstream side of the flow of the refrigerant, the power conversion device 200 can be effectively cooled.

The above description is merely an example, and when interpreting the invention, the correspondence between the items described in the embodiment and the items described in the claims is not limited or restricted at all. Further, the present invention is not limited to the above embodiment as long as the features 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 parallel flow paths such as the

flow path sections

19 b and 19 c are provided, and the

pipes

13 and 14 are not provided. The end may be penetrated to the outside of the case and the both ends may be connected by piping.

1: Electric drive device 12: Case 12a-12d: Side wall 12i: Through

hole

19, 1919, 919b, 919c: Flow path 19a-19c: Flow path section 20: Control circuit board 22: Driver circuit Substrate, 136: battery, 140: inverter circuit, 200: power converter, 300 U to 300 W: power module, 304: module case, 405: storage space, 405 a to 405 d: side surface, 405 f: bottom portion, 500: capacitor module, 507, 950: Insulating sheet, 802, 802 U to 802 W: AC bus bar, 900: rotary electric machine, 902 U to 902 W: AC terminal, 908: front bracket, 909: center bracket, 910: rear bracket, 912: housing, 930: rotor , 940: Stator

Claims

A rotating electrical machine having a rotor, a stator, and a housing in which a first refrigerant flow path is formed to hold the stator;
And a power conversion device including an inverter circuit and fixed to an outer periphery of the housing, the electric drive device being of an integral type.
The power converter is
A smoothing capacitor provided on the DC input side of the inverter circuit;
An inverter case having a flow passage forming portion in which a second refrigerant flow passage and a recess in which the smoothing capacitor is disposed are formed;
A plurality of power semiconductor modules having a bottomed cylindrical module case containing power semiconductor elements for power conversion, at least a part of the module case being disposed in the second refrigerant flow path; Equipped
The power conversion device is fixed to the housing such that a bottom surface portion of the concave portion in which the smoothing capacitor is disposed is in contact with an outer periphery of the housing.
In the machine-electric integrated type electric drive apparatus according to claim 1,
The second refrigerant flow path communicates first and second flow path sections provided in parallel so as to sandwich the smoothing capacitor, and opposite ends of the first and second flow path sections. A third flow path section,
The mechanical-electrical integrated type electric drive apparatus is characterized in that the concave portion is disposed in a region surrounded by the first to third flow path sections.
In the machine-electric integrated type electric drive apparatus according to claim 2,
A plurality of alternating current terminals connected to an armature winding of the rotating electrical machine are disposed on the outer periphery of the housing, respectively;
The power converter includes a plurality of alternating current bus bars connecting the plurality of power conductor modules and the plurality of alternating current 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 A machine-electric integrated electric drive unit characterized in that it is connected.
In the machine-electric integrated type electric drive apparatus according to claim 3,
The plurality of alternating current bus bars are in contact with the flow path forming portion via an electrically insulating member in the outer region, and the machine-electric integrated type electric drive device.
In the electromechanical and integral type electric drive apparatus according to any one of claims 1 to 4,
The power conversion device is fixed to the housing such that a perpendicular drawn from an axial core of the rotating electrical machine to a housing contact surface which the bottom surface contacts contacts the bottom surface. Electric drive unit.
In the electromechanical and integral type electric drive apparatus according to any one of claims 1 to 5,
The power semiconductor module is disposed in the second refrigerant flow channel such that a bottom portion of the bottomed cylindrical module case faces the housing fixing direction of the case. Electric drive.
In the electromechanical and integral type electric drive apparatus 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 electric power conversion device is fixed to only the housing.
In the electromechanical and integral type electric drive apparatus according to any one of claims 1 to 7,
A communication pipe connecting the first refrigerant flow path and the second refrigerant flow path;
A refrigerant coupled to the second refrigerant flow channel is led to the first refrigerant flow channel via the communication pipe, and the electric drive apparatus of the mechanical-electrical integrated type.