JPH0865944A - Motor driver - Google Patents

Abstract

PURPOSE: To prevent the generation of electromagnetic noise by eliminating a feeder between a motor and an inverter. CONSTITUTION: The motor driver comprises a motor body 15, a motor case 14 for containing the body 15, an inverter body for supplying 24 current to the body 15, an inverter case 16 for containing the body and fixedly directly above the case 14, and a coupling member 51 directly extended from the case 14 to the case 16 and coupled at one end to the winding 39 of the body 15 and at the other to the inverter body. AC current generated by the inverter body flows through the winding 39 of the body 15 via the member 51 to drive the motor. In this case, since the metal part of the member 51 is extremely shortened, electromagnetic noise can be sufficiently suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device.

[0002]

2. Description of the Related Art Conventionally, in a motor drive device, a motor has been designed to be controlled by a CPU.
A torque command, a resolver signal from a resolver, etc. are input to the PU, and a current command signal generated based on these signals is output from the CPU. Then, the current command signal is input to the current comparison circuit, and the current comparison circuit compares the current command signal with the motor current signal fed back from the motor.

The deviation generated in the current comparison circuit is output to the PWM signal generation circuit and the PW is generated.
In the M signal generation circuit, the input deviation is compared with the reference triangular wave, a switching pulse is generated, and P
It is output to the gate circuit as a WM signal. Then, the gate circuit outputs the input PWM signal to the inverter, and the inverter switches the direct current from the battery to generate three-phase (U-phase, V-phase and W-phase) alternating current. . The alternating current generated in this way is supplied to the motor and drives the motor.

By the way, the motor and the inverter are separately formed, and are connected by three power supply lines. Therefore, electromagnetic noise is generated from the power supply line. Therefore, the generation of electromagnetic noise is suppressed by shielding the power supply line or shortening the power supply line by changing the arrangement positions of the motor and the inverter (Japanese Patent Publication No. 5-30123). (See the official gazette).

[0005]

However, in the above-mentioned conventional motor drive device, there is a limit in shortening the power supply line, and it is not possible to sufficiently suppress the generation of electromagnetic noise. Therefore, a motor drive device in which a motor and an inverter are integrated is provided (Japanese Patent Laid-Open No. 6-3).
(See Japanese Patent No. 0547). In this case, a heat sink is formed in the lower part of the inverter, and both side walls of the heat sink are fixed to the side surface of the motor. Therefore, the inverter is arranged directly above the motor, and the power supply line can be further shortened.

However, since the motor and the inverter are connected to each other by a power supply line outside the respective cases,
Similarly, electromagnetic noise is generated. Further, since the power supply line has a flexible structure, when it is mounted in an electric vehicle by connecting it in the air, the strength may be reduced due to vibration, and looseness may occur at the connecting portion. I will do it. Therefore, the power supply line is usually fixed to a metal member having high strength.

However, in this case, the metal member and other parts are short-circuited or electromagnetic noise is generated. In addition, since the power supply line, connector, etc. will be installed outside the case of each of the motor and the inverter, when water drops adhere to cause a short circuit or contact with other parts, human body, etc. A disconnection may occur. The present invention solves the problems of the conventional motor drive device,
An object of the present invention is to provide a motor drive device that not only prevents the generation of electromagnetic noise by eliminating the need for a power supply line between the motor and the inverter, but also does not cause short circuit, disconnection, or the like.

[0008]

Therefore, in a motor drive device of the present invention, a motor main body, a motor case for accommodating the motor main body, an inverter main body for supplying a current to the motor main body, and the inverter main body. And an inverter case fixed immediately above the motor case, and a connection in which the one end is directly connected to the winding of the motor body and the other end is connected to the inverter body. And a member.

The connecting member is electrically insulated from the motor case and the inverter case. In another motor drive device of the present invention, the connecting member includes a metal rod having one end connected to a winding of the motor body and the other end connected to an inverter body, and the metal rod is connected to the motor case and the inverter case. And an insulating member that electrically insulates.

[0010]

According to the present invention, as described above, in the motor drive device, the motor main body, the motor case for accommodating the motor main body, the inverter main body for supplying current to the motor main body, An inverter case, which is housed in the inverter body and fixed directly above the motor case, extends directly from the inside of the motor case into the inverter case, and has one end connected to the winding of the motor body and the other end connected to the inverter body. And a connecting member.

The alternating current generated by the inverter body flows through the connecting member to the winding of the motor body to drive the motor. In this case, since the metal portion of the connecting member becomes extremely short, it is possible to sufficiently suppress the generation of electromagnetic noise. Further, since the power supply line, the connector and the like are not provided outside the motor case and the inverter case, the structure of the motor drive device can be simplified. Therefore, since a short circuit due to the attachment of water droplets does not occur, it is not necessary to provide a waterproof structure, and the cost can be reduced. Also other parts,
It is also possible to prevent disconnection due to contact with the human body or the like.

The connecting member is electrically insulated from the motor case and the inverter case. Therefore, it is possible to prevent a short circuit or electromagnetic noise from being generated in the metal portion that electrically connects the motor body and the inverter body.

In another motor drive device of the present invention,
The connecting member includes a metal rod having one end connected to the winding of the motor body and the other end connected to the inverter body, and an insulating member electrically insulating the metal rod from the motor case and the inverter case. In this case, since the metal rod has high strength, disconnection due to electromagnetic stress, vibration of the vehicle, etc. does not occur, and durability can be improved.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a sectional view of a motor drive device according to an embodiment of the present invention, FIG. 2 is a side view of the motor drive device according to the embodiment of the present invention, FIG. 3 is a sectional view taken along line XX of FIG. 2, and FIG. It is an external view of a YY cross section.

In the figure, 11 is a motor assembly,
Reference numeral 12 is an inverter assembly arranged on the motor assembly 11. The motor assembly 1
1 includes a motor case 15 which houses a motor body 15, and the inverter assembly 12 which houses an inverter case 16 which houses an inverter body (not shown).

The motor case 14 has a saddle shape, and has a bottomed cylindrical portion 14a and a bottomed cylindrical portion 1
It comprises rectangular portions 14b and 14c protruding upward at both ends of 4a, and a lid portion 14d which forms a motor housing chamber 18 by closing one end of the bottomed cylindrical portion 14a. On the other hand, the inverter case 16 includes a base 16 a fixed to the rectangular portions 14 b and 14 c via bolts 21 and the base 16 a via bolts 22.
It is composed of a bottomed box-shaped portion 16b fixed to a.

A plurality of fins 24 are formed on the outer peripheral surface of the bottomed cylindrical portion 14a so as to project outward, and radiate the heat generated by the motor body 15. In addition, a plurality of fins 26 are formed on the lower surface of the base 16a so as to project downward, and radiate heat generated by the inverter body. And the bottomed cylindrical portion 1
A hole is formed in the center of the bottom portion of 4a and the center of the lid portion 14d, the motor shaft 27 is disposed through the hole, and is rotatably supported by bearings 29 and 30. Further, an annular convex portion 32 is formed adjacent to the central hole of the lid portion 14d, and a sensor chamber 34 is formed by closing the annular convex portion 32 with a lid member 33.

Further, a resolver 35 is disposed on the annular convex portion 32 so as to face the sensor chamber 34, and the resolver 3 is provided.
Reference numeral 5 detects the rotational speed of the motor shaft 27 protruding through the hole into the sensor chamber 34 and the magnetic pole position of the motor. The motor main body 15 is attached to substantially the center of the motor shaft 27 and is fixed together with the rotor 37 that is rotated together with the motor shaft 27 and the rotor 37 on the inner peripheral surface of the cylindrical portion of the bottomed cylindrical portion 14a. And a winding 39 to which the three-phase alternating current generated in the inverter body is supplied.

The winding 39 comprises a U-phase winding 41, a V-phase winding 42 and a W-phase winding 43. The U-phase winding 41,
Crimp terminals 41a-4 of the V-phase winding 42 and the W-phase winding 43
3a extends upward and is connected to the connecting member 51 in the motor case 14. On the other hand, the terminal 62 of each transistor of the inverter body is connected to the connecting member 51 in the inverter case 16. The connecting member 51 is connected to the inverter case 16 from inside the motor case 14.
Extends directly into. Therefore, the outside air does not directly contact the connecting member 51.

The connecting member 51 comprises a block 53 provided on the rectangular portion 14b, a spacer 54 provided between the block 53 and the lid portion 14d, and three pieces standing upward from the upper surface of the block 53. A sleeve 55 and a metal rod 56 extending vertically in the sleeve 55 and connected at the upper end to a terminal 62 of each transistor of the inverter body.
Consists of.

By the way, the block 53 and the spacer 5
Both 4 and the sleeve 55 are made of an insulating material and constitute an insulating member. The block 53 electrically insulates the crimp terminals 41a to 43a from the rectangular portion 14b and has terminal accommodating chambers 53a to 53c for accommodating the crimp terminals 41a to 43a. And each crimp terminal 41a-43a is respectively terminal accommodation chamber 53a-
It is connected to the lower end of the metal rod 56 in 53c.
In addition, the spacer 54 includes the crimp terminals 41 a to 43.
electrically insulating a from the lid portion 14d,
The terminal accommodating chambers 53a to 53c are arranged on the lid portion 14d side and cover the terminal accommodating chambers 53a to 53c.

Further, the three sleeves 55 are provided between the motor case 14 and the inverter case 16 and
The metal rod 56 is electrically insulated from the motor case 14 and the inverter case 16. By locking the block 53 to the step P formed on the rectangular portion 14b and pressing the block 53 and the spacer 54, the lid portion 14d is fixed to the end surface of the bottomed cylindrical portion 14a. The block 53 can be fixed.

Further, the lower end of each metal rod 56 and each of the crimp terminals 41a to 43a are connected to each metal rod 5 by a bolt 61.
6 upper end and terminal 62 of each transistor of the inverter body
And are fixed by bolts 63. In this way, the connecting member 51 that connects the motor body 15 and the inverter body
Is disposed in the motor case 14 and the inverter case 16, the sleeve 55 can be made extremely short. Therefore, it is possible to sufficiently suppress the generation of electromagnetic noise.

Further, since the power supply line, the connector and the like are not provided outside the motor case 14 and the inverter case 16, the structure of the motor drive device can be simplified. Therefore, since a short circuit due to the attachment of water droplets does not occur, it is not necessary to provide a waterproof structure, and the cost can be reduced. It is also possible to prevent disconnection due to contact with other parts, the human body, or the like.

The metal rod 56 that electrically connects the motor body 15 and the inverter body is connected to the motor case 14 by the block 53, the spacer 54 and the sleeve 55.
And electrically insulated from the inverter case 16. Therefore, it is possible to prevent a short circuit or electromagnetic noise from occurring between the metal rod 56 and the motor case 14 and between the metal rod 56 and the inverter case 16.

Further, since the metal rod 56 has higher strength than the power supply line formed by the twisted wire, electromagnetic stress,
The disconnection due to the vibration of the vehicle does not occur, and the durability can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a motor drive device according to an embodiment of the present invention.

FIG. 2 is a side view of the motor drive device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

4 is an external view of the YY cross section of FIG. 3. FIG.

[Explanation of symbols]

 14 Motor Case 15 Motor Main Body 16 Inverter Case 39 Winding 51 Connecting Member 53 Block 54 Spacer 55 Sleeve 56 Metal Rod

Claims (2)

[Claims] 1. A motor main body, a motor case for accommodating the motor main body, an inverter main body for supplying a current to the motor main body, and an accommodating the inverter main body,
The inverter case is fixed directly above the motor case, and extends from the inside of the motor case directly into the inverter case, and has one end of the winding of the motor main body and the other end of the connecting member connected to the inverter main body. The motor driving device, wherein the connecting member is electrically insulated from the motor case and the inverter case. 2. The connecting member has a metal rod whose one end is connected to the winding of the motor body and the other end is connected to the inverter body, and an insulation for electrically insulating the metal rod from the motor case and the inverter case. The motor drive device according to claim 1, comprising a member.