JPH0799750A - Construction of motor block of electric car - Google Patents

Abstract

PURPOSE:To place a controller easily in a compact structure and cool control devices such as a heat generating device, etc., which are provided in the controller effectively. CONSTITUTION:The construction if a motor block which is provided in an electric car is described. A gap 8 which is to be the path of coolant such as cooling water is formed between a rotor 3 and a motor yoke 2. Further, a swollen part 6 on which a controller 4 is placed is formed and control devices 7 such as a heat generating device, etc., are provided in the controller 4 and the coolant is supplied to the gap 8 by a cooler 5 to cool the motor and the controller simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a motor unit structure of an electric vehicle having an electric motor and its controller.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication No. 4-261304, an induction motor driven by a battery power source is provided in a vehicle body, and this motor is used when starting or accelerating with a large accelerator depression amount. The wheels are supplementarily driven by operating in accordance with a control signal output from the retard control device. Also, during steady running with a small accelerator depression amount, the induction motor operates as a generator to generate power according to the mechanical energy of the engine drive system, convert this electrical energy into direct current with an inverter, and charge the battery. It is configured.

[0003]

The induction motor is constructed such that its operating state is controlled by a controller such as a retard control device. This controller has various control devices that form a control circuit,
In order to prevent the control device from being affected by the vibration of the vehicle body, the control device is supported at a predetermined position on the vehicle body through a vibration damping mount member. Therefore, there is a problem that a special space for installing the controller is required and a complicated work is required for wiring the lead wire connecting the controller and the induction motor.

When a heating element such as a thyristor is used as the control device, a cooling device for cooling the heating element with cooling water or the like is provided.
Since it is necessary to prevent the heating element from overheating,
There is a problem that the structure of the controller becomes more complicated.

The present invention has been made in order to solve the above problems, and a controller can be installed easily and compactly, and a control device such as a heating element provided in the controller is effective. It is an object of the present invention to provide a motor unit structure of an electric vehicle that can be cooled to a low temperature.

[0006]

SUMMARY OF THE INVENTION The present invention is a motor unit structure installed in an electric vehicle, wherein a cooling medium passage is formed between a rotor and a motor yoke.
The motor yoke is integrally formed with a controller installation portion, and a control device including a heating element or the like is installed inside the controller.

[0007]

According to the present invention having the above-mentioned structure, both the electric motor and the coat roller are operated by the cooling medium such as cooling air or cooling water supplied to the cooling medium passage formed between the rotor and the motor yoke. It will be cooled effectively.

[0008]

1 and 2 show an embodiment of a motor unit structure of an electric vehicle according to the present invention. The motor unit 1 has a cylindrical motor yoke 2, a rotor 3 rotatably supported by bearings provided at both ends of the motor yoke 2, and a diagram attached to the inner peripheral surface of the motor yoke 2. An electric motor equipped with an outer field iron core, etc.,
A controller 4 attached to the upper end of the motor yoke 2 and a cooling device 5 for cooling the motor unit 1.
And have.

The motor yoke 2 constituting the outer cylinder of the electric motor is made of a material having a high thermal conductivity such as an aluminum alloy, and a bulging portion 6 for installing the controller 4 is integrally formed on the upper end portion thereof. There is. Then, the thyristor and the I.G. installed on the bulging portion 6 of the motor yoke 2 are connected.
A controller 4 including a control device 7 such as an BT (Insulated gate bipolar transistor) is installed. Further, a gap portion 8 serving as a passage for cooling air is formed between the motor yoke 2 and the rotor 3, and a cooling air communicating with the gap portion 8 is formed on a side surface of the motor yoke 2. An inlet 9 and an outlet 10 for cold air are formed.

The cooling device 5 comprises an air supply duct 11 whose tip is connected to the inlet 9 for the cooling air, and a blower 12 provided at the base end of the air supply duct 11.
External air sucked by the blower 12 is introduced into the gap portion 8 between the motor yoke 2 and the rotor 3 through the air supply duct 11, and then from the outlet 10 to an exhaust duct (not shown). It is configured to be led out to the outside via.

As shown in FIG. 3, the motor unit 1 is installed at the bottom of the electric vehicle together with the transmission 13. Then, the driving force of the motor unit 1 is controlled according to the control signal output from the controller 4 to the electric motor in accordance with the operating state of the electric vehicle, and the driving force is applied to the transmission 13 and the outside of the figure. It is transmitted to the left and right rear wheels via a propeller shaft and a differential gear.

As described above, the motor yoke 2 of the electric motor is formed with the bulging portion 6 serving as a mounting portion for the controller 4, and the controller 4 is mounted on the bulging portion 6. The controller 4 can be installed easily and compactly as compared with the case where the controller is installed at a distant position. That is, by installing the controller 4 on the motor yoke 2 in advance and wiring the lead wires, the controller 4 can be installed on the vehicle body at the same time as installing the electric motor without requiring complicated wiring work inside the vehicle body. It can be easily attached to the vehicle, and the controller 4 can be installed in the installation space for the electric motor to effectively use the vehicle space.

Moreover, the motor yoke 2 of the electric motor is
Since the mount member is attached to the vehicle body through the mount member and the vibration of the vehicle body is transmitted to the motor yoke 2 by the mount member, the mount member dedicated to the controller 4 is not installed. It is possible to prevent the control device 7 and the like installed inside the controller 4 from being adversely affected by the vibration of the vehicle body.

Further, a gap portion 8 serving as a passage for cooling air is formed between the motor yoke 2 and the rotor 3 arranged therein, and cooling air is supplied into the gap portion 8. Since the cooling device 5 is provided, the electric motor and the controller 4 can be simultaneously cooled by the cooling air supplied from the cooling device 5. Therefore, when the control device 7 including the thyristor and the heat generating element such as IGBT is arranged in the controller 4,
It is possible to effectively prevent the controller 4 from generating heat during operation and overheating the controller 4 to a high temperature.

Further, in the above embodiment, since the motor yoke 2 is made of a material having a high thermal conductivity such as an aluminum alloy, the heat transferred from the control device 7 including the heating element to the motor yoke 2 is transferred to the cooling air. It is possible to more effectively prevent the inside of the controller 4 from being heated to a high temperature by the positive cooling.

In order to improve the cooling effect of the control device 7 by the cooling air, the control device 7 is directly mounted on the installation portion of the controller 4 including the bulging portion 6 formed integrally with the motor yoke 2. It is desirable to install the control device 7 so that the heat generated by the heat generation of the control device 7 is easily transmitted to the motor yoke 2. Further, in order to further increase the cooling action of the controller 4 by the cooling air, as shown in FIG. 4, a cooling fin 14 may be projectingly provided on the lower surface of the installation portion of the controller 4 including the bulging portion 6. Good.

In the above embodiment, an example in which the air-cooling type cooling device 4 for cooling the electric motor and the controller 4 by cooling air is provided has been described, but a seal is provided between the motor yoke 2 and the rotor 3. A structure in which a cooling water passage is provided and a water cooling type cooling means for supplying the cooling water to the passage may be provided.

[0018]

As described above, according to the present invention, the controller yoke is formed on the motor yoke of the electric motor, and the controller is installed on the controller. Therefore, the controller is previously installed on the motor yoke. By pre-wiring, the controller can be easily attached to the vehicle body together with the electric motor without requiring complicated wiring work inside the vehicle body, and the controller can be installed using the installation space of the electric motor. Can be installed compactly. Moreover, there is an advantage that it is possible to prevent the control device installed inside the controller from being adversely affected by the vibration of the vehicle body without installing the mount member dedicated to the controller.

Further, since the passage of the cooling medium is formed between the motor yoke and the rotor disposed inside the motor yoke, the cooling medium such as cooling air is supplied to this passage, whereby the electric motor and the controller are controlled. And can be cooled at the same time. Therefore, even when a control device including a thyristor and a heat generating element such as IGBT is arranged in the controller, the control device generates heat during operation and the controller is heated to a high temperature. This can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a motor unit structure of an electric vehicle according to the present invention.

FIG. 2 is a sectional view of the motor unit structure.

FIG. 3 is a side view showing a state in which the motor unit is installed in an electric vehicle.

FIG. 4 is a sectional view showing another embodiment of the motor unit structure.

[Explanation of symbols]

 1 Motor unit 2 Motor yoke 3 Rotor 6 Controller installation part 7 Control equipment 8 Passage

Claims (1)

[Claims] 1. A motor unit structure installed in an electric vehicle, wherein a passage for a cooling medium is formed between a rotor and a motor yoke, and a controller installation portion is formed in the motor yoke. A motor unit structure for an electric vehicle, in which a control device including a heating element and the like is installed inside.