JPH08336261A - Driver system for electric vehicle - Google Patents

Abstract

PURPOSE: To obtain a driver system for electric vehicle in which enhancement of productivity and maintenability can be enhanced when the size, weight and noise of drive system are reduced by integrating a power conversion means and a motor. CONSTITUTION: A multiwinding motor 101 is combined and integrated with a power converter module 102 and liquid-cooled heat sinks 123, 322 for motor and power converter are interconnected through electric system connectors 103, 104 on the motor and power converter sides. The electric system connectors 103, 104 on the motor and power converter sides are connected in same direction as the cooling pipe connectors 105 on the motor and power converter sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle driving apparatus driven by electric power from a battery, and more particularly to an electric vehicle driving apparatus suitable for miniaturization.

[0002]

2. Description of the Related Art As an electric vehicle drive device driven by electric power from a battery, for example, Japanese Patent Laid-Open No. 5-29270.
There is a conventional technique disclosed in Japanese Patent Laid-Open No. This is a drive system for an electric vehicle including an electric vehicle drive device, which shortens the length of electric system wiring and cooling liquid piping by integrating a power converter (hereinafter, also referred to as power conversion means) and a motor body. It is intended to reduce the size and weight of and reduce radio noise.

On the other hand, the technology for manufacturing an electric motor on the electric motor manufacturing line and for manufacturing the electric power converter on the electric power converter manufacturing line has existed prior to Japanese Patent Application Laid-Open No. 5-292703 (hereinafter , Called a separate type). In this case, when the separately manufactured electric motor and electric power converter are finally combined, both are put into the assembly line, the cooling liquid piping is inserted with packing and bolted, and the electric system wiring is connected with the solderless terminal. To do. That is, although a complicated connection work is required in the final step, the electric motor and the power converter can be manufactured in parallel on separate manufacturing lines, and thus the productivity can be improved to some extent.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the conventional technique disclosed in Japanese Patent No. 2703,
The following points are not taken into consideration. First, in the separated type configuration in which the electric motor and the power converter are separately manufactured and finally combined, the electric motor and the power converter can be manufactured in parallel, and can be assembled after completion of each. In the integrated structure described in this prior art, the electric motor and the power converter have to be assembled to one casing, so that the production has to be serially performed on one production line, and mass production is required. It is difficult to improve productivity when performing Secondly, since the power converter is completely built into the motor body, it is difficult to replace the power converter in case of failure, resulting in poor maintainability.

Further, although it is certain that the separated type structure can improve productivity to some extent at the time of manufacturing, it is not possible to reduce the size and weight of the electric vehicle drive system that can be realized by the integrated type structure. This is possible, and a very large electromagnetic shield is required to reduce radio noise, and it is difficult to take measures against it.

An object of the present invention is to improve the productivity and maintainability of an electric vehicle in order to reduce the size and weight of a drive system of an electric vehicle and reduce radio noise by integrating an electric power conversion means and an electric motor. A vehicle drive device is provided.

[0007]

To achieve the above object, according to the present invention, an electric motor for driving an electric vehicle to travel,
An electric vehicle drive device having an electric power conversion means for supplying electric power in a form that can be used by an electric motor, wherein an attachment means for attaching the electric power conversion means to the electric motor and a liquid for an electric motor which is provided in the electric motor and is cooled by a cooling liquid. A cold heat sink, a liquid cooling heat sink for power conversion means that is provided in the power conversion means and is cooled by a cooling liquid, and a power conversion means side that is provided in the liquid cooling heat sink for power conversion means and that sends the cooling liquid. A cooling pipe connecting connector and a liquid cooling heat sink for an electric motor, which are connected to the electric power converting unit side cooling pipe connecting connector by mounting the electric power converting unit to the electric motor by the mounting unit, for sending the cooling liquid. There is provided an electric vehicle drive device having an electric motor side cooling pipe connection connector that enables the electric vehicle. .

In the above electric vehicle drive device, preferably, the power conversion means has a power transmission connector capable of supplying power by being inserted into a power terminal of the electric motor, and the insertion direction of the power transmission connector is the power transmission connector. The direction of connection of the converter side cooling pipe connecting connector to the electric motor side cooling pipe connecting connector is the same.

Further, preferably, there are two or more power converting means, and each of the power converting means is provided with the liquid-cooled heat sink for the power converting means.

In the above, preferably, two or more power conversion means are independently shielded from the environment.

Further, preferably, each of the liquid-cooled heat sinks for power conversion means provided in the two or more power conversion means has a cooling pipe, and each of the cooling pipes has the two or more power conversion means. Each of them is configured in parallel with each other.

Further, preferably, the electric motor has a structural member for mounting the electric power converting means, and the structural member has a pipe for sending a cooling liquid therein.

Further, preferably, the power conversion means side cooling pipe connecting connector and the electric motor side cooling pipe connecting connector are constituted by a cylindrical projection or a hole, and at least one of the connectors is a cooling liquid in a non-connected state. It has a liquid leakage prevention means for sending the cooling liquid in the connected state to prevent the liquid leakage.

Further, in the above electric vehicle drive device, preferably, the liquid-cooled heat sink for an electric motor is composed of an inner cylindrical portion and an outer cylindrical portion, and the outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion are formed. At least one of them is formed with a groove serving as a flow path of a cooling liquid, the inner cylinder portion is mounted on the outer periphery of the electric motor, and the outer cylinder portion is mounted on the outer periphery of the inner cylinder portion by shrink fitting. .

Further, preferably, the power receiving connector provided in the power converting means and supplied with power from the power source portion, and the electricity charged inside the power converting means when the power receiving connector is removed from the power source portion. And a discharge means.

Further, a vibration isolating means for absorbing vibration between the electric motor and the electric power converting means may be provided.

[0017]

According to the present invention, when the electric power converting means is attached to the electric motor by the attaching means, the electric power converting means-side cooling pipe connecting connector provided on the liquid cooling heat sink for the electric power converting means and the liquid cooling heat sink for the electric motor are provided. The electric motor side cooling pipe connection connector is connected to enable the flow of the cooling liquid. The cooling of the electric motor and the power conversion means is performed by using the liquid-cooled heat sink for the electric motor and the liquid-cooled heat sink for the power conversion means, respectively, and the cooling liquid for the cooling is supplied by flowing between the both connectors. Will be. That is, the electric motor and the power conversion means are combined and integrated, and at the same time, the liquid cooling heat sink for the electric motor and the liquid cooling heat sink for the electric power conversion means are easily connected via the connector, so that either the electric motor or the electric power conversion means is connected. Also, it becomes possible to reliably perform the essential cooling.

As a result, the electric motor and the electric power conversion means can be manufactured independently of each other, and they can be combined and integrated at the time of mounting on the electric vehicle, and the productivity can be improved. Further, since the power conversion means can be easily removed from the electric vehicle drive device after being combined, it does not take time and effort to replace it when the power conversion means fails, and the maintainability is improved. Is possible.

Further, by providing the power conversion means with a power transmission connector and inserting the power transmission connector into the power terminal of the electric motor, it becomes possible to supply power to the power conversion means, and further, the insertion direction of the power transmission connector is By connecting the cooling pipe connection connector on the power conversion unit side to the cooling pipe connection connector on the electric motor side, the electric motor and the power conversion unit are combined and integrated, and at the same time, the wiring for supplying power to the power conversion unit is connected. Also, the manufacturing time can be shortened.

Further, when there are two or more power conversion means, each of the power conversion means is provided with a liquid-cooled heat sink for power conversion means, so that each power conversion means can be surely cooled.

In the above case, it is possible to enhance the waterproofness and noise resistance of each power conversion means by independently providing two or more power conversion means with an environment resistant shield such as a waterproof shield or an electromagnetic shield. .

Further, the cooling pipes provided on the liquid-cooled heat sinks for the power conversion means of the two or more power conversion means are arranged in parallel for each power conversion means, so that one power conversion means is maintained. Even if it is removed for this reason, only the cooling pipes belonging to the removed power conversion means are closed, and the complicated work of closing or reconnecting the other cooling pipes is not required. Therefore, it is very advantageous when it is necessary to continue driving the electric vehicle in a situation where repair cannot be received immediately.

Further, when the electric motor is provided with a structural member for mounting the electric power converting means, a pipe for sending a cooling liquid is provided inside the structural member so that the liquid cooling heat sink for the electric motor and the electric power converting means. Connection with a liquid cooling heat sink is possible via a structural member, and further downsizing can be achieved.

Further, the power conversion means side cooling pipe connecting connector and the electric motor side cooling pipe connecting connector are constituted by cylindrical protrusions or holes, and at least one of these connectors is provided with a liquid leakage preventing means, whereby the above connector is provided. Leakage of the cooling liquid is prevented in the unconnected state, and cooling can be performed by sending the cooling liquid in the connected state.

The liquid-cooled heat sink for an electric motor is composed of an inner cylinder part and an outer cylinder part, and a groove is formed on at least one of the outer peripheral surface of the inner cylinder part and the inner peripheral surface of the outer cylinder part. Even if the flow path of the cooling liquid is complicated, the cooling liquid is attached by fitting the tubular portion on the outer periphery of the electric motor by shrink fitting, and further by mounting the outer tubular portion on the outer periphery of the inner tubular portion by shrink fitting. It is possible to easily form the flow path in the liquid-cooled heat sink for the electric motor.

Further, a power receiving connector which receives power from the power source is provided in the power converting means, and when the power receiving connector is removed from the power source during maintenance, for example, the discharging means charges the inside of the power converting means. By discharging the generated electricity, it is not necessary to separately perform the discharging work.

Further, by absorbing the vibration between the electric motor and the electric power converting means by the vibration isolating means, it is possible to cope with a severe seismic condition in an electric vehicle or the like for off-road running.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electric vehicle drive device according to the present invention will be described with reference to FIGS.

FIG. 1 is a schematic explanatory view of an electric vehicle drive device of this embodiment. However, illustration of elements necessary for actually driving the electric vehicle, such as a battery, a contactor, and a controller, is omitted. The electric vehicle drive device of this embodiment includes a multiplex winding motor 101, a power converter module 102, and a power converter module mounting base 106. The multiplex winding motor 101 includes an electric motor output shaft 107, the power converter module mounting base 106 is mounted on the multiplex winding motor 101, and the power converter module mounting base 106 includes the electric motor side electrical system connector 103 and the electric motor. It has a side cooling pipe connection connector 105. Further, each of the three power converter modules 102 has a power converter module-side electrical system connector 104, and is attached to the power converter module mounting base 106 by attaching means 140 (see FIG. 5).

The power converter module 102 is a component that is finally removably assembled to the multiplex winding motor 101, and is a bridge-connected semiconductor switching element, switching element drive circuit, snubber capacitor, smoothing capacitor, current sensor. Is provided inside, and is environmentally shielded as described later (see FIG. 6).

The electric system wiring of the multi-winding motor 101 (hereinafter referred to as electric motor electric system wiring) and the electric system wiring of the power converter module 102 (hereinafter referred to as electric power converter electric system wiring) are connected to a motor side electric system connector 103. Wiring is completed by the connection between the power converter module side electric system connector 104 and the power converter module side electric system connector 104. Further, both the multi-winding electric motor 101 and the power converter module 102 are provided with liquid cooling heat sinks, and the cooling liquid pipes of these liquid cooling heat sinks are
When the electric motor side electric system connector 103 and the electric power converter module side electric system connector 104 are connected, they are simultaneously connected via the electric motor side cooling pipe connecting connector 105.

As an example of the connector of the cooling liquid pipe including the electric motor side cooling pipe connecting connector 105, a shape as shown in FIG. 2 can be considered. In FIG. 2, the power converter module mounting base 106 is represented as a lower liquid-cooled heat sink 111, and the lower liquid-cooled heat sink 111 is provided with a convex cooling pipe connection connector 113 and an O-ring 115. On the other hand, the power converter module 102 is referred to as an upper liquid cooling heat sink 112, and the upper liquid cooling heat sink 112 is provided with a concave cooling pipe connection connector 114 and a check valve 116.

The electric motor side cooling pipe connecting connector 105 shown in FIG. 1 is composed of a convex cooling pipe connecting connector 113 and an O-ring 115 in FIG. 2, and a power converter side cooling pipe connecting connector (not shown in FIG. 1). Is composed of a concave cooling pipe connection connector 114 and a check valve 116.
The convex cooling pipe connecting connector 113 has a cylindrical shape, and the concave cooling pipe connecting connector 114 is a circular hole having a diameter obtained by adding a predetermined clearance to the outer diameter of the convex cooling pipe connecting connector 113.

The convex cooling pipe connecting connector 113 is inserted into the concave cooling pipe connecting connector 114, and the mounting means 14 is attached.
When 0 (see Fig. 5) is applied between them, the O-ring 1
15 completely seals both, and the connection of the cooling liquid pipe is completed.

The backflow prevention valve 116 provided in the upper liquid-cooling heat sink 112 is a leakage preventing means and prevents the remaining cooling liquid from flowing out when the upper liquid-cooling heat sink 112 is removed for repair or the like. To prevent. In FIG. 2, a concave cooling pipe connector 11 having an opening facing downwards
The backflow prevention valve 116 is provided only in No. 4, but it is also possible to provide the backflow prevention valve in the convex cooling pipe connection connector 113. Note that FIG. 2 shows a general configuration of the check valve and the connector, and the structure thereof can be exactly the same as that used in a home humidifier or the like. The description is omitted.

Connection direction of the electric motor side electric system connector 103 and the electric power converter module side electric system connector 104, and connection of the electric motor side cooling pipe connecting connector 105 and the electric power converter side cooling pipe connecting connector (not shown in FIG. 1). The directions are the same, so that by simply pushing in by applying a force in one direction, connection and disconnection of both the electric system wiring and the cooling liquid pipe can be performed simultaneously and easily in one operation. A commercially available connector structure can be used for the electrical wiring.

FIG. 3 is a view for explaining the flow path of the cooling liquid pipe in the electric vehicle drive device shown in FIG. In FIG.
A liquid cooling heat sink 121 for an electric motor is attached to the outer peripheral portion of the multiplex winding motor 101, and a liquid cooling heat sink 122 for a power converter module is attached to the bottom surface of the power converter module 102.

The liquid cooling heat sink 121 for the electric motor includes a drive device cooling liquid receiving port 123 and a drive device cooling liquid draining port 12.
4, an electric motor upper cooling liquid sending port 125 and an electric motor upper cooling liquid receiving port 126 are provided, and the cooling liquid is exchanged with the liquid cooling heat sink 122 for the power converter module. Further, the drive device cooling liquid receiving port 123 and the drive device cooling liquid sending port 124
Is made up of vinyl chloride piping and pipes, etc., and is connected to an external cooling liquid circulation system (not shown) to exchange cooling liquid with the external cooling liquid circulation system and other liquid cooling heat sinks. Is also possible.

The power converter module mounting base 106 has a lower mounting base cooling liquid inlet 127 and a lower mounting base cooling liquid outlet 128 on the lower surface, and an upper mounting base upper cooling liquid outlet 129 and an upper mounting base cooling liquid. Each of the three receiving ports 130 is provided. The mounting table upper cooling liquid outlet 129 and the mounting table upper cooling liquid receiving port 130 are the above-described electric motor side cooling pipe connection connector 105.

The liquid-cooled heat sink 122 for the power converter module has a lower surface on the lower surface of the power converter module cooling liquid receiving port 131 and the power converter module lower cooling liquid sending port 1.
And 32. The power converter module lower cooling liquid inlet 131 and the power converter module lower cooling liquid outlet 132 are the aforementioned power converter side cooling pipe connection connectors.

The flow path of the cooling liquid in the cooling liquid piping path as described above will be described. Drive device cooling liquid inlet 12
The cooling liquid flowing from 3 is the liquid cooling heat sink 1 for the electric motor.
After cooling the multi-winding electric motor 101 by flowing through a part of the inside 21, the electric current flows from the electric motor upper cooling liquid outlet 125 to the electric power converter module mounting base 106 via the mounting base lower cooling liquid inlet 127. The cooling liquid is divided into three paths in the power converter module mounting base 106 corresponding to the three power converter modules 102, and is sent to the three mounting base upper cooling liquid outlets 129. The cooling liquid from the mounting table upper cooling liquid outlet 129 is taken into the power converter module liquid cooling heat sink 122 from the power converter module lower cooling liquid inlet 131 and cools each of the three power converter modules 102.

The cooling liquid that has cooled the three power converter modules 102 is the cooling liquid delivery port 1 for the lower part of the power converter modules.
From 32, it is sent to the power converter module mounting base 106 via the mounting base upper cooling liquid receiving port 130. The cooling liquid that was split into three when cooling the liquid-cooled heat sink 122 for the power converter module is the power converter module mounting base 1
In 06, it is put together again into one path, and is sent to the electric motor upper cooling liquid receiving port 126 through the mounting table lower cooling liquid sending port 128.

After that, the cooling liquid flows through the liquid cooling heat sink 121 for the electric motor, cools the multi-winding electric motor 101, and is returned to the external cooling liquid circulation system through the driving device cooling liquid outlet 124.

In this embodiment, the cooling liquid is divided into three paths in the power converter module mounting base 106, and the cooling liquid flows in parallel to each of the three liquid cooling heat sinks 122 for the power converter module. ing. Accordingly, even if one power converter module 102 is removed for maintenance or the like, the cooling pipes belonging to the removed power converter module 102 (the power converter module lower cooling liquid inlet 131 and the power converter module lower cooling liquid 131 Outlet 1
32) Only by blocking only, there is no need for complicated work such as blocking or reconnecting the other cooling pipes. Therefore,
This is extremely advantageous when it becomes necessary to continue driving the electric vehicle in a situation where repair cannot be received immediately.

FIGS. 4A and 4B show the power converter module mounting base 106. The power converter module mounting base 106 is made of a plate material, and the shunt pipe 133
And a confluence pipe 134 is provided as a round hole penetrating the power converter module mounting base 106. And
The mounting table lower cooling liquid receiving port 127 and the mounting table upper cooling liquid sending port 129 communicate with the diversion pipe 133, and the mounting table lower cooling liquid sending port 128 and the mounting table upper cooling liquid receiving port 130 communicate with the confluent pipe 134. There is. In addition, the diversion pipe 133
Caps 135 are attached to both ends of the confluence pipe 134, and the mounting table lower cooling liquid inlet 127, the mounting table lower cooling liquid outlet 128, the mounting table upper cooling liquid outlet 129, and the mounting table upper cooling liquid inlet are provided. The leakage of the cooling liquid other than 130 is prevented.

Generally, the power converter module mounting base 10
6 is also a structural member that supports the power converter module 102, but in the present embodiment, a pipe for cooling liquid is provided inside the power converter module mounting base 106 that forms such a structural member, so that liquid cooling for an electric motor is performed. The heat sink 121 and the liquid-cooled heat sink 122 for the power converter module can be connected via the power converter module mounting base 106, and further downsizing can be achieved.

FIGS. 5A and 5B show an example of mounting means for mounting the power converter module 102 on the power converter module mounting base 106. The mounting means 140 shown in FIG. 5 includes a mounting lever 141, a mounting hook 142, and a mounting ring 143.

The mounting lever 141 is rotatably mounted on the power converter module 102, while the mounting hook 142 is fastened to the power converter module mounting base 106. Further, the attachment ring 143 is attached to the attachment lever 141 so as to be rotatable. In the above, the rotation axes of the mounting lever 141 and the mounting ring 143 are parallel to each other.

When mounting the power converter module 102 on the power converter module mounting base 106, the mounting lever 141 is tilted to hook the mounting ring 143 on the mounting hook 142, and then the mounting lever 141 is lifted to complete the mounting. The attachment ring 143 is made of an elastic material, and the elasticity fixes the power converter module 102 to the power converter module 106. The mounting means 140 is detachable, and when removing the power converter module 102 from the power converter module mounting base 106, the procedure reverse to the above may be performed. Since such a mechanism of the attachment means 140 is used everywhere such as a storage case, detailed description thereof will be omitted.

In this embodiment, the mounting means 140 is connected to an electric system connector such as the electric motor side electric system connector 103 and the electric power converter module side electric system connector 104, or the electric motor side cooling pipe connecting connector 105 and the electric power converter side cooling pipe. Although the cooling liquid piping connector such as the connector is provided separately, the cooling liquid piping connector may also serve as the mounting means 140. In this case, for example, a mechanism used for connecting a hose of a fire engine may be used.

FIG. 6 is a diagram showing an environment resistant shield.
As shown in FIG. 6, an environment-resistant shield member 144a for covering the wiring from the multiplex winding motor 101 to the electric motor side electric system connector 103 is provided, and the electric motor side electric system connector 103 and the power converter module side electric system connector 104 are provided.
An environment-resistant shield member 144b is provided to cover the connection part of the. The environment-resistant shield members 144a and 144b are made of a conductive material such as an aluminum thin plate and individually cover the power converter modules 102. In this embodiment, the noise source is the power converter module 102.
And the noise is protected by the environment-resistant shield member 144.
Since it is absorbed by a and 144b and is electromagnetically shielded (EMI shield), the generation of electromagnetic noise to the outside can be suppressed. In addition, the environment-resistant shield members 144a, 14
4b also has a waterproof shield property that prevents water from entering from the outside. Therefore, the waterproofness and noise resistance of the power converter module 102 can be improved.

FIG. 7 shows a liquid-cooled heat sink 121 for an electric motor.
Shows the configuration of. As shown in FIG. 7, the electric motor liquid-cooled heat sink 121 is composed of an electric motor liquid-cooled heat sink inner cylinder 152 and an electric motor liquid-cooled heat sink outer cylinder 153. Note that, in FIG. 7, the route of the cooling liquid toward the power converter 102 is omitted for simplicity.

The liquid cooling heat sink inner cylinder 152 for the electric motor is
A groove 152a serving as a cooling liquid flow path is formed by cutting in a cylinder having an inner diameter slightly smaller than the outer diameter of the electric motor main body 151. Further, the liquid cooling heat sink outer cylinder for electric motor 1
Reference numeral 53 denotes a cylindrical side surface whose inner diameter is slightly smaller than the outer diameter of the liquid cooling heat sink inner cylinder for electric motor 152, and through holes for the driving device cooling liquid receiving port 123 and the driving device cooling liquid draining port 124 are opened. The liquid-cooled heatsink inner cylinder 152 for electric motor is fitted to the outer periphery of the electric motor main body 151 by shrink fitting, and the liquid-cooled heatsink outer cylinder 153 for electric motor is fitted to the outer periphery of the liquid cooling heatsink inner cylinder 152 for electric motor by shrink fitting. Allows liquid-cooled heat sink 12 for electric motor
1 and the combination of the electric motor liquid cooling heat sink 121 and the electric motor main body 151 are completed, and a flow path of the cooling liquid based on the groove 152a is formed in the electric motor liquid cooling heat sink 121. This makes it possible to easily form a complicated cooling liquid flow path.

Further, in FIG. 7, the flow path of the cooling liquid is parallel to the electric motor output shaft 107, but there is no problem even if the flow path is perpendicular to the electric motor output shaft 107. Further, if there is no problem in processing, the liquid cooling heat sink outer cylinder 153 for the electric motor may be formed with a groove serving as a cooling liquid flow path. In addition, the liquid-cooled heat sink inner cylinder 152 for the electric motor may double as the casing of the electric motor main body 151, whereby the number of parts can be reduced.

FIG. 8 is a diagram for explaining a case where the heat sink for the end bracket of the electric vehicle and the heat sink of the electric vehicle drive device of this embodiment are connected. Conventional cooling of an electric motor has been performed by a heat sink attached to a stator coil and a cooling fan directly connected to an output shaft of the electric motor. However, in recent years, as the amount of heat generated per unit volume increases with the downsizing of electric motors, methods for directly cooling the rotors and bearings of the electric motors have been proposed. here,
The connection between the heat sink for the end bracket of the electric car and the heat sink of the electric car drive device of this embodiment will be described when the liquid-cooled bearing cooler for directly cooling the bearings is provided in the electric car drive device.

As shown in FIG. 8, the multiplex winding motor 101
Has a motor rotor 171, a motor stator 172, and a bearing 173, and a liquid cooling heat sink 121 for a motor is provided with a stator side cooling pipe connection connector 175. Further, the motor end bracket 174 includes a heat sink 174 a for the motor end bracket and bearings 17.
A liquid cooling bearing cooler 173a for cooling the motor 3 is provided, and an end bracket side cooling pipe connecting connector 176 is provided on the electric motor end bracket heat sink 174a.

The stator side cooling pipe connecting connector 175 and the end bracket side cooling pipe connecting connector 176 are
A structure similar to that of FIG. 2 can be realized. Thus, even if the electric vehicle drive device includes the liquid-cooled bearing cooler, the cooling liquid pipe can be easily connected according to the present embodiment. Note that the structure of the liquid-cooled bearing cooler in this embodiment is well known, so the description thereof is omitted. Furthermore, the same applies to an electric vehicle drive device including a liquid-cooled rotor cooler in addition to the liquid-cooled bearing cooler.

FIG. 9 is a diagram showing the discharging means in the power converter module 102 of this embodiment. The power converter module 102 is supplied with power from a power supply unit via a power receiving connector, and usually has a charging unit such as an electrolytic capacitor inside the power converter module 102. In such a case, the power converter module 102 may be used for maintenance or the like.
When the battery is removed from the power supply part, the charging part may still have electric charge accumulated, and a separate discharge work is required to avoid an electric shock accident to the worker. The discharging means of the present embodiment is for automatically discharging the electric charge charged inside when the power converter module 102 is removed from the power supply section.

As shown in FIGS. 9A and 9B, the DC power receiving connector 18 of the power converter module 102.
Reference numeral 1 denotes a portion of the power supply unit that is connected to the DC power transmission connector 182. The power supply terminals 181a and 181b, the contact switch 183, the discharging resistor 184, and the discharging circuit 184a.
Is provided. In addition, the power converter internal charging unit 185 configured by an electrolytic capacitor or the like is used in the power converter module 10
2 included in the circuit for power conversion. The DC power transmission connector 182 has power supply terminals 182a and 182b and a battery 187 for power supply. The insulating pin 186 is fixed on the DC power transmission connector 182. Here, the contact switch 183, the discharging resistor 184, the discharging circuit 184a, and the insulating pin 186 constitute a discharging means.

When the DC power receiving connector 181 and the DC power sending connector 182 are connected, the power supply terminal 18
1a and power supply terminal 182a, and power supply terminal 18
1b and the power supply terminal 182b are connected to each other, and the power from the battery 187 is supplied to the power converter module 102.

In the above structure, when the DC power receiving connector 181 and the DC power sending connector 182 are connected, as shown in FIG. 9A, the insulating pin 186 fixed to the DC power sending connector 182. Is inserted into the contact switch 183, and the contact switch 183 is turned off. As a result, no current flows in the discharge circuit 184a including the discharge resistor 184, and the power converter module 1
It becomes possible to supply electric power to 02.

On the other hand, when the DC power receiving connector 181 is removed from the DC power sending connector 182 and both are not connected, as shown in FIG. 9B, the contact switch 1
Insulation pin 186 is pulled out from 83 and contact switch 183
Becomes an ON state, a current flows through the discharge circuit 184a including the discharging resistor 184 and the power converter internal charging unit 185, and the electricity remaining in the power converter internal charging unit 185 is discharged. A cement resistor or the like is preferably used as the discharge resistor 184.

FIG. 10 is a diagram for explaining the vibration isolator provided in the electric vehicle drive system of this embodiment. As shown in FIG. 10, an anti-vibration member 188 as an anti-vibration means is provided between the electric motor liquid-cooled heat sink 121 of the multi-winding electric motor 101 and the power converter module mounting base 106. Of the pipes, the motor upper cooling liquid outlet 125 and the motor upper cooling liquid inlet 126 of the liquid cooling heat sink 121 for electric motor and the pipe connected to the electric motor side cooling pipe connecting connector 105 in the power converter module mounting base 106 are made of rubber. It is connected by a pipe 189. As the vibration isolating member 188, a seismic isolation rubber or polymer vibration absorbing material is used. However, in FIG. 10, the configuration of the liquid-cooled heat sink 122 for the power converter module is illustrated in a simplified manner.

By providing the vibration isolating member 188 as shown in FIG. 10, the vibration between the multiplex winding motor 101 and the power converter module 102 can be absorbed by the vibration isolating member 188. It can be used even in severe seismic conditions such as electric vehicles intended for off-road driving. Also, due to vibration, the liquid-cooled heat sink 12 for the electric motor
Even if the positions of 1 and the power converter module mounting base 106 deviate from each other, the rubber pipe 189 ensures the flow path of the cooling liquid therebetween.

According to the present embodiment as described above, the multiple winding motor 101 and the power converter module 102 are integrated to reduce the size and weight of the electric vehicle drive system including the electric vehicle drive device and reduce the radio noise. Can be reduced, and the following effects can be obtained.

First, the multi-winding electric motor 101 and the power converter module 102 are combined and integrated, and at the same time, the electric motor liquid cooling heat sink 121 and the electric power converter module liquid cooling heat sink 122 are connected to the electric motor side electrical system connector 103 and. They can be easily connected to each other via the electric system connector 104 on the electric power converter module side, and the essential cooling can be surely performed for both. Further, since the connecting direction of the electric motor side electric system connector 103 and the electric power converter module side electric system connector 104 and the connecting direction of the electric motor side cooling pipe connecting connector 105 and the electric power converter side cooling pipe connecting connector are the same, both Connection and removal of both the electric system wiring and the cooling liquid piping can be performed simultaneously and easily in one operation.

Therefore, the multi-winding motor 101 and the power converter module 102 can be manufactured independently of each other, and they can be combined and integrated at the time of mounting on the electric vehicle. Since it is easy to connect and disconnect the system wiring and the cooling liquid piping, the productivity can be improved.

Further, since the power converter module 102 can be easily removed from the electric vehicle drive device after being combined, for example, one power converter module 1
02 when the power converter module 102
Even if the system including the electric vehicle drive device can be fully restored by simply replacing the battery, or even if the repair cannot be immediately received, the drive performance is slightly deteriorated by simply removing the defective power converter module 102. It is possible to continue operation (complementary operation). That is, it does not take time to replace the power converter module 102 power converter, and the maintainability can be improved. However, in the present embodiment, the complementary operation as described above is realized by using the multiplex winding motor 101, but the power converter modules 102 are electrically connected to a normal electric motor via a DC inductance. By doing so, the same complementary operation is possible.

In addition to the above, according to this embodiment, the following effects can be obtained.

First, the environment-resistant shield members 144a, 14
Since each power converter module 102 is independently covered with 4b, its waterproofness and noise resistance can be enhanced.

Further, since the cooling liquid flows in parallel to each of the power converter module liquid-cooled heat sinks 122, even if one power converter module 102 is removed for maintenance or the like, the removed power converter module 102 still has the same power. Only the cooling pipe to which it belongs is closed, and the complicated work such as closing or reconnecting the other cooling pipes is not required. Therefore, it is very advantageous when it is necessary to continue driving the electric vehicle in a situation where repair cannot be received immediately.

Further, since the check valve 116 is provided in the connector portion of the cooling liquid pipe as a leakage preventing means, it is possible to prevent the cooling liquid remaining inside from flowing out when the connector portion is removed for repair or the like.

Further, the liquid-cooled heat sink 122 for the power converter module includes a liquid-cooled heat sink inner cylinder 152 for an electric motor and a liquid-cooled heat sink outer cylinder 1 for an electric motor provided with grooves 152a.
53, and includes an electric motor main body 151, a liquid-cooled heat sink inner cylinder 152 for an electric motor, and a liquid-cooled heat sink outer cylinder 1 for an electric motor.
Since 53 is mounted by shrink fitting, even if the flow path of the cooling liquid is complicated, the flow path of the cooling liquid can be easily formed.

Further, the contact switch 183 and the discharging resistor 1
Since the discharging means constituted by the 84, the discharging circuit 184a, and the insulating pin 186 is provided in the DC power receiving connector 181 of the power converter module 102 and the DC power sending connector 182 of the power source unit, the DC power receiving connector 18
1 is disconnected from the DC power transmission connector 182, current flows through the discharge circuit 184a, and the power converter internal charging unit 1
The electricity remaining in 85 is discharged, and it is not necessary to perform a discharge operation separately for maintenance or the like.

Further, since the vibration isolating member 188 is provided between the multiplex winding motor 101 and the power converter module mounting base 106, vibration between them can be absorbed by the vibration isolating member 188. For example, it can be applied to the case where the seismic condition is severe, such as an electric car for off-road driving. Further, during vibration, the rubber pipe 189 secures a flow path for the cooling liquid therebetween.

Although the three power converter modules 102 are used in the above embodiment, the same effect can be obtained with any number of power converter modules. For example, even a configuration using one power converter module is advantageous in improving productivity and maintainability. However, when only one power converter module is used, when the power converter module fails, the operation must be stopped and replaced or repaired, and the operation cannot be continued.

If the power converter module 102 can be made sufficiently small, the power converter module mounting base 106 may be omitted. In this case, the electric motor upper cooling liquid sending port 125 and the electric motor upper cooling liquid receiving port 126 of the electric motor liquid cooling heat sink 121.
And the power converter module lower cooling liquid inlet 131 and the power converter module lower cooling liquid outlet 132 of the power converter module liquid cooling heat sink 122 are directly connected as a connector.

Furthermore, it is effective to assemble not only the multi-winding motor 101 and the power converter module 102, but also a heat sink for the other heat-generating member so that they are integrated. For example, a liquid-cooled heat sink 121 for an electric motor
And liquid-cooled heat sink 122 for power converter module
In addition, it is possible to integrate the transmission gear heat sink according to the method of the present invention.

[0079]

According to the present invention, the two heat sinks can be integrated by combining them, and at the same time, the respective heat sinks can be easily connected via the connector, so that the essential cooling can be surely performed for both heat sinks. Therefore, by integrating the electric motor and the power conversion means, it is possible to reduce the size and weight of the drive system of the electric vehicle and reduce the radio noise, and it is possible to improve the productivity. Further, since the power conversion means can be easily removed, it does not take time and effort to replace it, and the maintainability can be improved.

Further, since the inserting direction of the connector of the electric system wiring is the same as the connecting direction of the cooling liquid pipe,
Both are connected at the same time, and the manufacturing time can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an electric vehicle drive device according to the present invention.

2 is a cross-sectional view showing an example of a connector of a cooling liquid pipe including the electric motor side cooling pipe connection connector in FIG.

3 is a diagram illustrating a flow path of a cooling liquid pipe in the electric vehicle drive device shown in FIG.

4A and 4B are diagrams showing a power converter module mounting base, where FIG. 4A is a plan view and FIG. 4B is a sectional view taken along line BB in FIG. 4A.

5A and 5B are views showing an example of attachment means for attaching the power converter module to the power converter module mounting base, FIG. 5A is a front view, and FIG. 5B is a side view.

6A and 6B are views showing an environment-resistant shield, in which FIG. 6A is a front view of an electric vehicle drive device provided with the environment-resistant shield, and FIG.
[Fig. 3] is a side view of (a).

FIG. 7 is a diagram showing a configuration of a liquid-cooled heat sink for an electric motor.

FIG. 8 is a heat sink for an end bracket of an electric vehicle,
It is a figure explaining the case where it connects with the heat sink of the electric vehicle drive device of FIG.

FIG. 9 is a diagram showing a discharging means in the power converter module, wherein (a) is a case where a DC power receiving connector and a DC power sending connector are connected, and (b) is a DC power receiving connector sending DC power. It is a figure when it is removed from a connector.

FIG. 10 is a diagram showing a vibration isolator included in the electric vehicle drive device.

[Explanation of symbols]

 Reference Signs List 101 multi-winding motor 102 power converter module 103 electric motor side electrical connector 104 power converter module side electric system connector 105 electric motor side cooling pipe connection connector 106 electric power converter module mounting base 116 backflow prevention valve 121 liquid cooling heat sink for electric motor 122 Liquid cooling heat sink for power converter module 125 Electric motor upper cooling liquid outlet 126 Electric motor upper cooling liquid inlet 127 Mounting base lower cooling liquid receiving port 128 Mounting base lower cooling liquid feeding outlet 129 Mounting base upper cooling liquid feeding outlet 130 Mounting base upper part Cooling liquid receiving port 131 Power converter module lower cooling liquid receiving port 132 Power converter module lower cooling liquid sending port 133 Dividing pipe 134 Merging pipe 140 Mounting means 141 Mounting lever 142 Mounting hook 143 Mounting ring 1 44a, 144b Environment-resistant shield member 151 Electric motor body 152 Electric motor liquid-cooled heat sink inner cylinder 152a Groove 153 Electric motor liquid-cooled heat sink outer cylinder 173 Bearing 173a Liquid-cooled bearing cooler 174a Electric motor end bracket heat sink 175 Stator side cooling pipe connection connector 176 End bracket side cooling pipe connection connector 181 DC power reception connector 182 DC power transmission connector 183 Contact switch 184 Discharge resistor 184a Discharge circuit 186 Insulation pin 188 Anti-vibration member 189 Rubber pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Kudo 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. (72) Inori Inoue Takezo 2520 Takata, Oita, Hitachinaka City, Ibaraki Stock Company Hitachi, Ltd. Automotive Equipment Division

Claims (10)

[Claims] 1. An electric vehicle drive device having an electric motor for driving and driving an electric vehicle, and an electric power conversion means for supplying electric power in a form that can be used by the electric motor, wherein an attachment means for mounting the electric power conversion means on the electric motor. A liquid cooling heat sink for an electric motor, which is provided in the electric motor and is cooled by a cooling liquid; a liquid cooling heat sink for a power converting device, which is provided in the power converting device and is cooled by a cooling liquid; and a liquid cooling heat sink for the power converting device. And a power conversion means-side cooling pipe connecting connector for sending the cooling liquid, and the power conversion means provided on the liquid cooling heat sink for the electric motor and by mounting the power conversion means on the electric motor by the mounting means. An electric motor side cooling pipe connecting connector which is connected to the means side cooling pipe connecting connector and enables the flow of the cooling liquid. Electric vehicle drive system which is characterized in that. 2. The electric vehicle drive device according to claim 1, wherein the power conversion means has a power transmission connector that enables power to be supplied by being inserted into a power terminal of the electric motor, and the insertion direction of the power transmission connector. Is the same as the direction of connection of the electric power conversion means side cooling pipe connecting connector to the electric motor side cooling pipe connecting connector. 3. The electric vehicle drive device according to claim 1, wherein there are two or more power conversion means, and each of the power conversion means is provided with a liquid-cooled heat sink for the power conversion means. Electric vehicle drive device. 4. The electric vehicle drive apparatus according to claim 3, wherein the two or more power conversion means are independently shielded from the environment. 5. The electric vehicle drive device according to claim 3, wherein each of the liquid cooling heat sinks for the power converting means provided in the two or more power converting means has a cooling pipe,
Further, each of the cooling pipes is configured to be parallel to each other for each of the two or more power conversion means, and the electric vehicle drive device. 6. The electric vehicle drive device according to claim 1, wherein the electric motor has a structural member for mounting the electric power conversion means, and the structural member has a pipe for sending a cooling liquid therein. An electric vehicle drive device characterized by the above. 7. The electric vehicle drive device according to claim 1, wherein the power conversion means-side cooling pipe connection connector and the electric motor-side cooling pipe connection connector are constituted by cylindrical protrusions or holes, and at least one of the connectors. The electric vehicle drive device has a leakage preventing means for preventing leakage of the cooling liquid when not connected and for sending the cooling liquid when connected. 8. The electric vehicle drive apparatus according to claim 1, wherein the liquid-cooled heat sink for an electric motor is composed of an inner cylinder part and an outer cylinder part, and an outer peripheral surface of the inner cylinder part and an inner peripheral surface of the outer cylinder part. A groove serving as a flow path of the cooling liquid is formed in at least one of the inner cylinder portion and the outer cylinder portion. An electric vehicle drive device characterized in that. 9. The electric vehicle drive device according to claim 1, wherein the power conversion means is provided in the power conversion means and receives power from a power supply part, and the power conversion means when the power reception connector is removed from the power supply part. An electric vehicle drive device further comprising a discharging means for discharging the electricity charged inside the vehicle. 10. The electric vehicle drive device according to claim 1, further comprising a vibration isolator that absorbs vibration between the electric motor and the electric power conversion means.