JPH0775215A - Electric vehicle motor drive unit - Google Patents

Abstract

PURPOSE:To increase inverter heat radiation and lower controller ambient temperature. CONSTITUTION:A drive unit to drive an electric vehicle motor 14 comprises an inverter 1 and controller 9, which are independently integral and waterproofed. By separating the inverter 1 from the controller 9 and waterproofing them independently, the heat radiation of the inverter 1 can be increased and the ambient temperature of the controller 9 can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor drive device used in an electric vehicle, and more particularly to a method for improving heat dissipation of an inverter section.

[0002]

2. Description of the Related Art Conventionally, when a motor drive device is mounted on an electric vehicle, it is a device that handles a high voltage, so that it may be placed in a relatively environmentally friendly place such as a driver's cab because of safety issues. Since this is not possible, it must be placed inside the bonnet, etc., and the drive unit must be environmentally resistant.

Therefore, in order to satisfy the waterproofness, mechanical strength, and electrical insulation strength of the drive unit, the inverter section and the control section are electrically interfered with each other by a mechanically robust waterproof case. It had to be installed and sealed so that it would not.

[0004]

SUMMARY OF THE INVENTION In a motor drive device having a conventional configuration, an inverter unit and a control unit are integrated,
It was placed in a sealed mechanically robust waterproof case.

In this drive device, while the waterproofness, the mechanical strength and the electrical insulation strength are satisfied, the heat radiation from the heat generating inverter part is limited to the radiator such as the heat sink. There was a problem of being muffled. For this reason, it is necessary to increase the capacity of the radiator and use a heat-resistant component even in a single component such as a control circuit unit inside the waterproof case that does not particularly generate heat. This is a factor of increasing the volume and cost of the drive device.

Therefore, an object of the present invention is to improve the heat dissipation of the inverter section and reduce the ambient temperature of the control section by separating the inverter section and the control section and independently waterproofing them. To provide.

[0007]

According to another aspect of the present invention, there is provided a motor drive device for an electric vehicle, which is a drive device for driving a motor for an electric vehicle, the drive device including an inverter portion and a control portion, and an inverter portion and a control portion. The parts are housed in individually sealed cases, shutting off the heat source between each case,
It is characterized by being integrally connected through a harness.

[0008]

(Embodiment 1) Embodiment 1 of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a driving device according to the present invention.

FIG. 1 shows an inverter unit including a power conversion circuit for supplying drive power to the motor 14. Inverter unit 1
2 is a power element for converting the DC power supply 15 into AC. 3 is a capacitor for smoothing the DC power supply 15,
4 is a diode for protecting components when the DC power supply 15 is reversely connected, 5 is a radiator mainly for radiating heat from the power element 2, 6 is a temperature sensor for measuring the temperature of the radiator 5, and 7 is a motor It is composed of a current sensor for measuring the current flowing through 14, a fuse 8 for preventing an overcurrent from the DC power supply 15, and the like. A control unit 9 controls the inverter unit 1. Board 10, control power supply 11, C
It is composed of the PU 12, the semiconductor element 13, and the like. The inverter section 1 and the control section 9 are separated from each other, and each part is hermetically sealed in each waterproof case, coated with waterproof paint, or molded with a resin having extremely low heat resistance.

Next, the detailed arrangement of the inverter unit 1 and the control unit 9 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the electric vehicle motor drive device of the present invention. The inverter section is arranged on the upper stage, and the inverter section 1 is a main component or a power element 2, which is likely to generate heat, the capacitor 3, the diode 4, the temperature sensor 6, and the current sensor 7, which are fixed to one surface of the radiator 5 with screws. . In order to waterproof the parts of the inverter unit 1, packing 20 and a cover 21 for waterproofing and protection are provided.
It is sealed with. 22 is a drive signal for the inverter unit 1
, A waterproof connector that can be input without impairing waterproofness, 23
Is composed of a waterproof connector that can output drive power to the motor without impairing waterproofness. Next, the control unit is arranged in the lower stage, and the control unit 9 controls the substrate 10 to include the control power supply 11 and the CPU 1.
2. The semiconductor element 13 and the like are mounted. 25 is waterproof,
A case for protection, 26 is a packing for waterproofing the parts of the control unit 9, 27 is a lid of the waterproof case 25,
Reference numeral 8 is a spacer for fixing the board 10 to the waterproof case 25, and 29 is a waterproof connector capable of outputting a drive signal to the inverter unit 1 without impairing waterproofness. The drive signal is input to the waterproof connector 22 through the harness 30. To be done. Since the upper inverter unit 1 is more likely to generate heat than the lower control unit 9, it is directly attached to the upper radiator 5 in order to keep the maximum spatial distance from the lower control unit 9 and the heat transmitted to the radiator 5 is Packing 20 to prevent it from being transmitted to the lower control unit 9,
The cover 21, the heat insulating material 24, and the case 25 are made of a combination of materials having different thermal conductivities, and the heat conducting path is made longer to block and fix the heat. Further harness 3
It is arranged below the radiator 5 in order to reduce the heat transferred to 0, and is arranged laterally so that oil, moisture, etc. do not easily collect in the connector 22.

The control unit 9 is fixed to the non-heat radiation surface of the inverter unit 1 via a heat insulating material 24. The heat insulating material 24 is intended not only to prevent the heat generation of the inverter unit 1 from being transmitted to the control unit 9, but also to suppress the vibration of the inverter unit 1. In addition to this, a space distance may be provided by a spacer or the like as long as it is a means for blocking heat. The heat generated by the power element 2, which is a main heat source, is radiated by the radiator 5. Radiator 5
In the above, the case of natural air cooling is assumed, but measures such as forced cooling by an air cooling fan or a water cooler may be performed. (Embodiment 2) Embodiment 2 of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 is a sectional view of an electric vehicle motor drive device according to another embodiment of the present invention. As described in the first embodiment, at least the case between the inverter unit 1 and the control unit 9 is integrally configured via the radiator 5 so that heat can be easily dissipated. The radiator 5 has a prismatic heat radiation structure and heat radiation components can be arranged on four sides. Reference numeral 31 is an air cooling fan for increasing the heat radiation efficiency of the radiator 5. In addition, a water cooler in which a water cooling pipe is provided for the radiator 5 may be used. The power element 2, the capacitor 3, the diode 4, the temperature sensor 6, and the current sensor 7, which are the main components of the inverter unit 1, are screwed and fixed to one surface of the radiator 5. In order to waterproof the components of the inverter unit 1, the components are sealed with a packing 20 and a cover 21 for the purpose of waterproofing and protection. Reference numeral 22 is a waterproof connector that can input a drive signal to the inverter unit 1 without impairing waterproofness, and 23 is a waterproof connector that can output drive power to the motor without impairing waterproofness. The control unit 9 includes a substrate 10, a control power source 11, a CPU 12, and a semiconductor element 13.
Etc. have been implemented. Reference numeral 25 is a case for waterproofing and protection, 26 is a packing for waterproofing parts of the control unit 9, 27 is a lid of the waterproof case 25, 28 is a spacer for fixing the substrate 10 to the waterproof case 25, Reference numeral 29 denotes a waterproof connector that can output a drive signal to the inverter unit 1 without impairing waterproofness, and the drive signal is input to the waterproof connector 22 through the harness 30. The control unit 9 is fixed via the heat insulating material 24 on either the heat radiation surface opposite to the inverter unit 1 fixed to the radiator 5 or the left and right surfaces. The heat insulating material 24 is intended to prevent the heat generation of the inverter unit 1 from being transmitted to the control unit 9. In addition to this, a space distance may be provided by a spacer or the like as long as it is a means for blocking heat. The heat generated by the power element 2, which is a main heat source, is radiated by the radiator 5. Although the radiator 5 is assumed to be forcibly cooled, natural air cooling alone may be used as long as the heat cutoff to the control unit 9 and the heat radiation from the inverter unit are sufficient.

In the above embodiment, the heat insulating material 24 is mounted between the control unit 9 and the heat radiator 5, but the heat radiator is sufficiently large and lower than the heat generation temperature of the control unit 9. In this case, the control unit 9 can be installed directly on the radiator 5 and the radiator 5 can be used as a part of the case of the control unit 9, and the mechanical strength of the entire motor control device can be increased.

The mounting direction of the driving device is not limited.

(Embodiment 3) Embodiment 3 of the present invention will be described below with reference to the accompanying drawings.

FIG. 4 is a sectional view of an electric vehicle motor drive device according to another embodiment of the present invention. The inverter unit 1 and the control unit 9 described in the first embodiment are integrally configured via the base plate 32. Reference numeral 32 is a base plate made of a material that can sufficiently satisfy the weight of the inverter unit 1 and the control unit 9 and may be a chassis of the electric vehicle body. The power element 2, the capacitor 3, the diode 4, the temperature sensor 6, and the current sensor 7, which are the main components of the inverter unit 1, are screwed and fixed to one surface of the radiator 5. In order to waterproof the components of the inverter unit 1, the components are sealed with a packing 20 and a cover 21 for the purpose of waterproofing and protection. Reference numeral 22 is a waterproof connector that can input a drive signal to the inverter unit 1 without impairing waterproofness, and 23 is a waterproof connector that can output drive power to the motor without impairing waterproofness. The control unit 9 has a board 10 on which a control power supply 11, a CPU 12, a semiconductor element 13, and the like are mounted. 25 is a case for waterproofing and protection, 26 is a packing for waterproofing the parts of the control unit 9, 27 is a lid of the waterproof case 25, 28 is the substrate 1
A spacer for fixing 0 to the waterproof case 25, 29
Is a waterproof connector capable of outputting a drive signal to the inverter unit 1 without impairing waterproofness, and the drive signal is input to the waterproof connector 22 through the harness 30. The inverter unit 1 and the control unit 9 are fixed to the base plate in a row via a heat insulating material 24. The heat insulating material 24 controls the heat generation of the inverter unit 1 by the control unit 9
The purpose is not to let them know. In addition to this, a space distance may be provided by a spacer or the like as long as it is a means for blocking heat. Further, the space distance between the inverter unit 1 and the control unit 9 may be maintained by utilizing the connection distance between the waterproof connector 22, the harness 30, and the waterproof connector 29. The heat generated by the power element 2, which is a main heat source, is radiated by the radiator 5. Although it is assumed that the radiator 5 is naturally air-cooled, measures such as forced cooling by an air-cooling fan or a water cooler may be performed. Further, the mounting direction of the drive device is not limited.

[0018]

According to the present invention, the heat dissipation path of the inverter section is improved by separating the inverter section and the control section, lengthening the heat conduction path, and independently waterproofing them.
Moreover, the ambient temperature of the control unit can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of the present invention.

FIG. 2 is a sectional view of a motor drive device for an electric vehicle of the present invention.

FIG. 3 is a sectional view of a motor drive device for an electric vehicle according to another embodiment of the present invention.

FIG. 4 is a sectional view of a motor drive device for an electric vehicle according to another embodiment of the present invention.

[Explanation of symbols]

 1. Inverter section 2. Power element 3. Smoothing capacitor 4. Diode 5. Heatsink 6. Temperature sensor 7. Current sensor 8. Fuse 9. Control unit 10. Substrate 11. Control power supply 12. CPU 13. Semiconductor device 14. Motor 15. DC power supply 20. Packing 21. Waterproof case 22. Waterproof connector 23. Waterproof connector 24. Heat insulating material 25. Waterproof case 26. Packing 27. Lid 28. Spacer 29. Waterproof connector 30. Harness 31. Waterproof fan 32. Base plate

Claims (2)

[Claims] 1. A drive device for driving a motor for an electric vehicle, wherein the drive device is composed of an inverter part and a control part, and the inverter part and the control part are housed in individually sealed cases. A motor drive device for an electric vehicle, characterized in that the heat source between the cases is shut off and is integrally connected through a harness. 2. A drive device for driving a motor for an electric vehicle, wherein the drive device is composed of an inverter part and a control part, and the inverter part and the control part are housed in a case which is independently sealed. A motor drive device for an electric vehicle, wherein at least a radiator is installed between the case of the control unit and the case of the inverter unit.