JPH06276716A - Cooling device for motor - Google Patents

Abstract

PURPOSE:To individually control an amount of cooling air for each motor. CONSTITUTION:Cooling air is supplied respectively to a first and a second motor 2, 3 through ducts 6, 6a, 6b and cooling air introducing openings 1b, 1c from a blower 5 and is discharged from a cooling air exhaust opening 1a and at the same time an amount of cooling air of the blower 5 supplied to each motor 2, 3 by butterfly valve 8 provided in the branching part of a duct 6 is individually controlled, thereby being able to individually cool each motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor cooling device for cooling a pair of electric motors in which a stator and a rotor are mounted in series on the same rotary shaft.

[0002]

2. Description of the Related Art As a cooling device for an electric motor of this type, for example, there is one disclosed in JP-A-1-107635. The cooling device for an electric motor disclosed in this publication is the first
A blower port and a blower device are provided in the casing between the second electric motor and the electric motor is cooled by sending cooling air to both ends of the casing through the outer peripheral side of the electric motor and between the stator and the rotor.

[0003]

SUMMARY OF THE INVENTION In the above-described conventional cooling device for an electric motor, even when only one of the two electric motors is operating, it is operated when the temperature rises to cool it. Since the other motor that does not have heat, that is, the other motor that does not generate heat is cooled at the same time, the cooling performance for the operating motor is about half for the amount of cooling air blown. However, there is a problem in that the cooling efficiency is poor, and the wind loss (mechanical loss) increases by blowing air to the other electric motor that does not need cooling, resulting in wasted energy consumption.

The present invention has been made in view of the above,
An object of the invention is to provide a cooling device for an electric motor, which can individually control the amount of cooling air for each electric motor.

[0005]

In order to achieve the above object, a cooling device for an electric motor according to the present invention is a cooling device for an electric motor that cools a pair of electric motors which are integrally formed, and which blows cooling air. Means for supplying cooling air from the blowing means to the first electric motor to cool the first electric motor
Second by means of the motor cooling means and the cooling air from the air blowing means.
Of the cooling air from the second motor cooling means for cooling the second motor by supplying the second motor to the second motor, and the amount of the cooling air supplied from the blowing means to the first and second motors, respectively. The gist is to have a control means.

[0006]

In the motor cooling device of the present invention, the air volume of the cooling air from the air blowing means supplied to the first and second electric motors is individually controlled by the air volume control means.
Each motor can be cooled individually.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a cooling device for an electric motor according to an embodiment of the present invention. The cooling device for the electric motor shown in the figure has a hollow rotating shaft 4 with rotors 2b and 3b.
b cools the fixed first and second electric motors 2 and 3, respectively, and the rotor 2 of the first electric motor 2
A stator 2a is provided on the outer circumference of b, and a stator 3a is provided on the outer circumference of the rotor 3b of the second electric motor 3. The stators 2a and 3a of the first and second electric motors 2 and 3 are fixed to the casing 1.
Further, the rotary shaft 4 on which the rotors 2b and 3b are fixedly mounted.
Both shaft ends are rotatably supported by the casing 1 via bearings 5a and 5b, respectively.

Further, ventilation holes 4a are formed at both ends of the rotary shaft 4.
And 4b are formed, and a ventilation hole 4c is also formed between the rotors 2b and 3b at the center of the rotary shaft 4. In the casing 1, a cooling air outlet 1a is formed between the stators 2a and 3a, a cooling air inlet 1b is formed at the end of the rotating shaft 4 near the stator 2a, and the stator 3a is further formed.
A cooling air introduction port 1c is formed on the end portion side of the rotating shaft 4 which is close to the cooling air introduction port 1c.

Further, in FIG. 1, a blower device 5 composed of a blower fan or the like is provided above the casing 1, and the cooling air from the blower device 5 is supplied to the duct 6, which is the duct 6. Is divided into two in the middle to form ducts 6a and 6b, and the cooling air inlets 1b are respectively formed.
And 1c, whereby the cooling air from the blower device 5 is divided from the duct 6 into the ducts 6a and 6b and guided into the cooling air inlets 1b and 1c as shown by the arrows.

A butterfly valve 8 which is an air volume control means is provided at a branch portion where the duct 6 is divided into ducts 6a and 6b. As shown in FIG. 2, the butterfly valve 8 is controlled by a stepping motor 7 to control the position, that is, the rotation angle, so as to control the air volume of the cooling air from the air blower 5 from the duct 6 to the ducts 6a and 6b. It is designed to be controlled. That is, when the butterfly valve 8 is in the neutral position as shown in the figure, the cooling air sent from the air blower 5 is evenly distributed to both the ducts 6a and 6b, but as shown in FIG. When laid down, the duct 6b is closed, and the cooling air flows only to the duct 6a. When laid down to the left as shown in FIG. 4, the duct 6a is closed and cooling air flows only to the duct 6b. become.

Next, the operation of the motor cooling device shown in FIG. 1 will be described with reference to the flowchart shown in FIG. The process shown in FIG. 5 shows a case where the electric motor of the cooling device shown in FIG. 1 is used as an example for running an electric vehicle.

In FIG. 5, first, it is checked whether or not the starter key of the electric vehicle is turned on (step 110). If it is off, the process returns to the beginning, but if it is on, it is checked whether the first and second electric motors 2 and 3 are operating (step 120).

When only the first electric motor 2 is operating, that is, operating, the routine proceeds to step 130, where the butterfly valve 8 is tilted to the right as shown in FIG. Then the first
The temperature of the electric motor 2 is detected (step 140), and it is checked whether the temperature is equal to or higher than a predetermined temperature (step 190). If the temperature is not higher than the predetermined temperature, the process returns to step 120. However, if the temperature is higher than the predetermined temperature, the air blower 5 is operated (step 200), whereby the cooling air from the air blower 5 is cooled by the arrow in FIG. As shown in FIG. 4, the air blower 5 to the duct 6, the duct 6a, the cooling air inlet 1b, the ventilation hole 4
a, it is supplied to the periphery of the first electric motor 2 through the ventilation hole 4c to cool the first electric motor 2, and then the cooling air exhaust port 1
The first electric motor 2 is cooled by discharging it from a, and then the process returns to the previous step 110 and the same process is repeated.

If only the second electric motor 3 is operating, the routine proceeds to step 150, where the butterfly valve 8 is tilted to the left as shown in FIG. Then, the temperature of the second electric motor 3 is detected (step 160), and it is checked whether the temperature is equal to or higher than a predetermined temperature (step 19).
0). If the temperature is not higher than the predetermined temperature, step 120
When the temperature is equal to or higher than the predetermined temperature, the air blower 5 is operated (step 200), whereby the cooling air from the air blower 5 is blown from the air blower 5 to the duct 6, as shown by the arrow in FIG. It is said that the second electric motor 3 is cooled by being supplied to the periphery of the second electric motor 3 through the duct 6b, the cooling air introduction port 1c, the ventilation hole 4b, and the ventilation hole 4c, and then discharged from the cooling air exhaust port 1a. The cooling process of the second electric motor 3 is performed, and then the process returns to the previous step 110 and the same process is repeated.

Further, when both the first electric motor 2 and the second electric motor 3 are operating, the routine proceeds to step 170, where the butterfly valve 8 is held at the neutral position as shown in FIG. Then, the temperatures of the first electric motor 2 and the second electric motor 3 are detected (step 180), and it is checked whether or not the temperatures are equal to or higher than a predetermined temperature (step 21).
0). If the temperature is not higher than the predetermined temperature, step 120
However, when the temperature is equal to or higher than the predetermined temperature, the air blower 5 is operated (step 220), whereby the cooling air from the air blower 5 is blown from the air blower 5 to the duct 6, as shown by the arrow in FIG. Duct 6a, duct 6b, cooling air inlet 1b, cooling air inlet 1c, ventilation hole 4a, ventilation hole 4b, ventilation hole 4c
Both electric motors that are supplied to both the first electric motor 2 and the second electric motor 3 via the air to cool both the first electric motor 2 and the second electric motor 3 and then discharged from the cooling air exhaust port 1a. Perform a few cooling processes and then return to the beginning.

FIG. 6 is a view showing a partial cross section of a hollow rotary shaft which is a part of a cooling device for an electric motor according to another embodiment of the present invention. In the embodiment shown in the figure, the rotary shaft corresponds to the rotary shaft 4 shown in FIG. 1. However, the only difference is that ventilation holes 40a and 40b are provided at both ends of this rotary shaft, and other configurations are provided. And the operation is the same as that shown in FIG.

Ventilation holes 40a and 40b formed at both ends of the rotary shaft shown in FIG. 5 are used when the electric motor rotates in a predetermined rotational direction, for example, when applied to an electric vehicle, the forward direction of the electric vehicle. When the rotation direction is equivalent to, the lead angle is formed in the direction in which the cooling air enters from the outside of the rotating shaft to the inside as shown by the arrow, and as a result, the cooling performance of the rotor can be improved even under more severe operating conditions. It is configured as follows.

[0019]

As described above, according to the present invention,
Since it is possible to individually control the air volume of the cooling air from the air blowing means supplied to the first and second electric motors by the air volume control means and individually cool each electric motor, both electric motors operate. The cooling air volume is supplied evenly to both motors, and when only one motor is operating, the optimum cooling air volume is supplied to only one motor. Accordingly, the optimum cooling air volume is supplied, the cooling capacity can be improved, and the operation time of the air blowing means can be shortened.
Energy efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a cooling device for an electric motor according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line S-S of FIG. 1 showing the configuration of a butterfly valve and a stepping motor used in the motor cooling device of FIG.

FIG. 3 is a cross-sectional view showing an operating state of a butterfly valve and a cooling air path of the cooling device for the electric motor of FIG.

4 is a cross-sectional view showing an operating state of a butterfly valve and a cooling air path of the motor cooling device of FIG.

5 is a flow chart showing the operation of the cooling device for the electric motor of FIG. 1. FIG.

FIG. 6 is a line R of FIG. 1 showing a partial cross section of a hollow rotating shaft which is a part of a cooling device for an electric motor according to another embodiment of the present invention.
It is sectional drawing taken along with -R.

[Explanation of reference numerals] 1 casing 1a cooling air outlet 1b, 1c cooling air inlet 2 first electric motors 2a, 3a stators 2b, 3b rotor 3 second electric motor 4 rotary shafts 4a, 4b ventilation holes 5 air blower 6,6a, 6b Duct 7 Stepping motor 8 Butterfly valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaro Kaneko 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Shigeru Sumiki 2 Takara-cho, Kanagawa-ku, Yokohama, Nissan Co., Ltd.

Claims (1)

[Claims] 1. A cooling device for an electric motor, which cools a pair of electric motors integrally configured, comprising: an air blowing unit that sends out cooling air; and a cooling air from the air blowing unit that is supplied to a first electric motor. First electric motor cooling means for cooling the first electric motor, and second electric motor cooling means for supplying the cooling air from the blowing means to the second electric motor to cool the second electric motor.
A cooling apparatus for an electric motor, comprising: an air volume control unit that individually controls an air volume of the cooling air from the air blowing unit that is supplied to each of the first and second electric motors.