JP3421142B2 - Vehicle mounted motor drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted 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 motor is driven by supplying the alternating current generated in this way.

By the way, the motor and the inverter are separately formed and are connected to each other by a power supply line. The motor is of a drip-proof type or a drip-proof type, and in the drip-proof type, water is prevented from entering the motor case and adhering to the winding. In addition, in the case of the exposure-proof specification, the structure is such that not only water but also air does not enter the motor case. In this case, the higher the airtightness of the motor case, the larger the heat-resistant capacity of the winding can be, but the motor case becomes larger and heavier accordingly.

On the other hand, the inverter case is often not drip-proof. Therefore, when the motor drive device is mounted on the vehicle, a place where water is unlikely to enter is selected and mounted.

[0006]

However, in the above-mentioned conventional motor drive device, the motor and the inverter are formed as separate bodies and are connected by the power supply line, so that the power supply line is connected to the electromagnetic field. Noise is generated. Therefore, a motor drive device in which a motor and an inverter are integrated is provided (Japanese Patent Laid-Open No. 6-30).
547). In the motor drive device, a heat radiating plate is formed under the inverter, and both side walls of the heat radiating plate are fixed to side surfaces of the motor. In this case, since the inverter is arranged directly above the motor, the power supply line is shortened and electromagnetic noise is suppressed from occurring.

However, when the motor and the inverter are integrated, neither of them can be mounted at an appropriate position. Therefore, for example, if the motor drive device is mounted at an appropriate position for the inverter, rainwater or the like may splash on the motor case, and water may enter the motor case from the breather. That is, when the motor is driven,
Heat is generated and the air inside the motor case expands, then
When the motor is stopped, no heat is generated and the air inside the motor case contracts. At this time, the pressure in the motor case decreases due to the contraction of air, and water enters through the minute gaps (clearances) in the motor case. Therefore, it is conceivable to enlarge the motor case in order to reduce the influence of the expansion and contraction of air. But in that case,
The weight becomes large, and the cruising range becomes short to drive the electric vehicle by the motor.

Therefore, a breather for eliminating a pressure difference between the inside and the outside of the motor case is formed at an appropriate position of the motor case, and air can freely move through the breather. However, when the motor drive device is mounted at a position where rainwater or the like is splashed on the motor case, water invades from the breather.

According to the present invention, the problems of the conventional motor drive device can be solved, the pressure difference between the inside and outside of the motor case can be eliminated, and water can be prevented from entering the motor case. An object of the present invention is to provide a vehicle-mounted motor drive device that can be used.

[0010]

Therefore, in a vehicle-mounted motor drive device of the present invention, a motor, a motor case for housing the motor, an inverter for supplying a current to the motor, and the inverter are housed. In addition, an inverter case fixed to the motor case, a breather formed in the inverter case to eliminate a pressure difference between the inside and the outside of the inverter case, and formed between the motor case and the inverter case. , And a communication passage for eliminating a pressure difference between the motor case and the inverter case.

In another vehicle-mounted motor drive device of the present invention, a metal rod further extends directly from the inside of the motor case into the inside of the inverter case, and has one end connected to the winding of the motor and the other end connected to the inverter. And a sleeve that electrically insulates the metal rod from the motor case and the inverter case. The communication passage is formed between the metal rod and the sleeve.

[0012]

According to the present invention, as described above, in the vehicle-mounted motor drive device, the motor, the motor case that houses the motor, the inverter that supplies current to the motor, and the inverter are provided. Accommodating,
An inverter case fixed to the motor case; a breather formed on the inverter case for eliminating a pressure difference between the inside and the outside of the inverter case; and a breather formed between the motor case and the inverter case, It has a communication passage for eliminating a pressure difference between the motor case and the inverter case.

In this case, the alternating current generated by the inverter is supplied to the winding of the motor to drive the motor. Since the metal portion connecting the motor and the inverter becomes extremely short, it is possible to sufficiently suppress the generation of electromagnetic noise.

Further, even if the pressure inside the motor case is about to drop due to the stop of the motor, the breather causes a pressure difference between the inside and the outside of the inverter case, and a communication passage causes a pressure difference between the motor case and the inverter case. Since it disappears, it is possible to prevent water from entering through the minute gaps of the motor case.

In another vehicle-mounted motor drive device of the present invention, a metal rod further extends directly from the inside of the motor case into the inside of the inverter case, and has one end connected to the winding of the motor and the other end connected to the inverter. And a sleeve that electrically insulates the metal rod from the motor case and the inverter case. The communication passage is formed between the metal rod and the sleeve. In this case, it is possible to prevent a short circuit or electromagnetic noise from occurring between the metal rod and the motor case and between the metal rod and the inverter case. Further, since the metal rod has high strength, disconnection due to electromagnetic stress, vibration of the vehicle, or the like does not occur, and the durability of the vehicle-mounted motor drive device can be improved.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. 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, and FIG. is there.

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 main body 15 housed in a motor case 14, and the inverter assembly 12 is configured by housing an inverter main body (not shown) in an inverter case 16.

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 projecting upward at both ends of 4a, and a lid portion 14d that closes one end of the bottomed cylindrical portion 14a to form a motor housing chamber 18. On the other hand, the inverter case 16 includes a base 16a fixed to the rectangular portions 14b and 14c with bolts (not shown), and a bottomed box-like portion 16b fixed to the base 16a with bolts 22.

A plurality of fins 24 are formed on the outer peripheral surface of the bottomed cylindrical portion 14a to radiate the heat generated by the motor body 15. A plurality of fins 26 are formed downward on the lower surface of the base 16a to radiate heat generated by the inverter body. A hole is formed in the center of the bottom portion of the bottomed cylindrical portion 14a and the center of the lid portion 14d, the motor shaft 27 is disposed through the hole, and the bearings 29, 30 are provided.
It is rotatably supported by. Also, the lid portion 14
An annular protrusion 32 is formed adjacent to the central hole of d, and the sensor chamber 34 is formed by closing the annular protrusion 32 with a lid member 33.

Further, a resolver 35 is arranged 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 so as to face the rotor 37 on the inner peripheral surface of the rotor 37 that is rotated together with the motor shaft 27 and the cylindrical portion of the bottomed cylindrical portion 14a. And a winding 39 to which the three-phase (U-phase, V-phase, and W-phase) alternating current generated in the inverter body is supplied.

The winding 39 is composed of a U-phase winding, a V-phase winding and a W-phase winding, and the crimp terminals 41 of the winding 39 extend upward and are connected to the connecting member 51 in the motor case 14. To be done. 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 extends directly from the inside of the motor case 14 into the inside of the inverter case 16. Therefore, the outside air does not directly contact the connecting member 51.

The connecting member 51 includes a block 53 arranged in the rectangular portion 14b, a spacer 54 arranged 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 terminal 41 from the rectangular portion 14b, and has a terminal accommodating chamber 42 for accommodating the crimp terminal 41.
Have. Each crimp terminal 41 is connected to the lower end of the metal rod 56 in the terminal accommodating chamber 42.
The spacer 54 electrically insulates the crimp terminal 41 from the lid portion 14 d, is arranged on the lid portion 14 d side of the terminal accommodating chamber 42, and covers the terminal accommodating chamber 42.

Further, the three sleeves 55 electrically insulate the metal rod 56 from the motor case 14 and the inverter case 16 between the motor case 14 and the inverter case 16. The rectangular portion 14b
The block 53 is fixed by locking the block 53 to the stepped portion P formed in the above and fixing the lid portion 14d to the end surface of the bottomed cylindrical portion 14a by pressing the block 53 and the spacer 54. be able to.

The lower ends of the metal rods 56 and the crimp terminals 41 are fixed with bolts 61, and the upper ends of the metal rods 56 and the terminals 62 of the transistors of the inverter body are fixed with bolts 63. In this way, the motor body 15
Since the connecting member 51 for connecting the inverter main body and the inverter main body is provided in the motor case 14 and the inverter case 16, the sleeve 55 can be extremely short.
Therefore, it is possible to sufficiently suppress the generation of electromagnetic noise.

The inverter case 16 is mounted in a position where the environment is not easily exposed to rainwater and the like, and an appropriate portion of the inverter case 16, in this embodiment, the base 16a, is provided for eliminating the pressure difference between the inside and the outside. A breather 71 is formed, and air can freely move through the breather 71. The breather 71 includes a first passage 71a extending vertically, a second passage 71b extending horizontally, and a third passage 7 extending vertically.
It is formed by combining 1c and the like so that water does not easily enter the inverter case 16.

On the other hand, a breather is not formed on the motor case 14 so that the motor case 14 is highly sealed. A clearance 72 is formed between the sleeve 55 and the metal rod 56 as a communication passage for eliminating a pressure difference between the inside of the motor case 14 and the inside of the inverter case 16, and air is freely released through the clearance 72. You can move to.

When the motor is driven, heat is generated and the air in the motor case 14 expands. When the motor is stopped thereafter, heat is not generated and the air in the motor case 14 contracts. At this time, the pressure in the motor case 14 tends to decrease due to the contraction of air. However, between the inside of the motor case 14 and the inside of the inverter case 16 via the clearance 72 and the breather 71, and between the inside and outside of the inverter case 16. Since there is no difference in atmospheric pressure, water can be prevented from entering through the minute gaps in the motor case 14.

In this embodiment, the outer diameter α of the metal rod 56 is set to 12.8 mm and the inner diameter β of the sleeve 55 is set.
Is set to 13 [mm]. Therefore, the value of the clearance 72 is 0.1 [mm]. Instead of the clearance 72, the outer peripheral surface of the metal rod 56, the sleeve 5
It is also possible to form a groove on the inner peripheral surface of 5 and use the groove as a communication passage. Also, inside the motor body 15 and the inverter case 1
It is also possible to form an opening or the like that communicates with the inside of 6 to form a communication passage.

[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 an enlarged view of a main part of the motor drive device according to the embodiment of the present invention.

[Explanation of symbols]

14 motor case 14a Bottomed cylindrical portion 15 Motor body 16 inverter case 27 motor shaft 37 rotor 38 Stator 39 windings 55 Sleeve 56 metal rod 71 Breather 72 clearance

Front page continuation (72) Inventor Satoru Tanaka 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (56) Reference JP-A-254943 (JP, A) JP-A-59- 194646 (JP, A) Actual flat 6-70469 (JP, U) Actual flat 6-57078 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 5/00-5 / 22 H02K 11/00

Claims (2)

(57) [Claims] 1. A motor, a motor case for accommodating the motor, an inverter for supplying a current to the motor , and an inverter for accommodating the inverter and fixed to the motor case.
A constant inverters cases, the form to the inverter case
The pressure difference between the inside and outside of the inverter case
A breather for eliminating the noise is formed between the motor case and the inverter case.
Onboard motor drive device according to claim Rukoto which have a and the communication path to eliminate the pressure difference between Takesu. 2. The motor case extends directly from the inside of the motor case to the inside of the inverter case, one end of which is the winding of the motor and the other end of which is the front.
The metal rod connected to the inverter, and a sleeve that electrically insulates the metal rod from the motor case and the inverter case, and the communication path is formed between the metal rod and the sleeve. Vehicle board described in 1.
Mounted motor drive device.