JPS62142895A - Cooling device for motor - Google Patents

Abstract

PURPOSE:To obtain an efficient cooling action by forming a cooling fan with a shape memory alloy which can control air quantity for cooling a motor according to the ambient temp. surrounding said motor. CONSTITUTION:A blade angle which gives the maximum quantity of air flow when the ambient temp. of a motor, i.e., the ambient temp. of a motor cooling fan 4 is the highest, is defined as alphaH, and a blade angle at the time of minimum quantity of air flow at a normal temp. is defined as alphaL. And, a required blade angle at a temp. in between, is defined as alpha and a motor cooling fan 4 is manufactured with a shape memory alloy in which the angle alpha is stored. Thereby, more than necessary quantity of air flow will not be given, without causing an output loss, while effecting an efficient cooling action.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a shape memory alloy that efficiently cools motors used under high temperatures inside combustion equipment and prevents damage to the motors due to abnormal heating. This invention relates to a motor cooling device using a cooling fan.

BACKGROUND OF THE INVENTION In recent years, motors have come to be used inside combustion equipment and the like, and cooling fans are installed to prevent the motors from being overheated and burnt out due to use in high-temperature atmospheres. and,
Since the blade angle of 77, which determines the fan's capacity, is constant, the cooling fan's capacity is high at low temperatures, and that energy is wasted in the motor's capacity.

An example of a conventional motor cooling fan will be described below.

Figure 4 shows an example of a conventional motor and cooling fan. 1 is the load of a motor such as a pump or fan, 2 is a motor, and the load 1 and the motor 2 are connected by a shaft 3. A motor cooling fan 4 is installed on the shaft 3 between the motor 2 and the load 1. The motor 2 is cooled by determining the amount of air from the motor cooling fan 4 depending on the angle and rotation speed of the blades of the motor cooling fan 4, and this air provides a cooling effect.

Problems to be Solved by the Invention In the conventional configuration described above, the cooling effect of the motor 2 is determined by the air volume of the motor cooling fan 4 and the temperature of the air, that is, the atmospheric humidity of the motor 2 and the temperature of the motor 2. . In other words, the greater the difference between the ambient temperature and the temperature of the motor 2 and the greater the air volume of the cooling fan 4, the greater the cooling effect. Here, as the temperature inside the equipment in which the motor 2 is used increases, the ambient temperature around the motor 2 increases, making it impossible to obtain the same cooling effect as before the ambient temperature became high, which may cause the motor 2 to burn out. Connect. Therefore, in order to obtain the same cooling effect, the air volume of the motor cooling fan 4 must be increased. To do this, the number of rotations of the motor cooling fan 4 must be increased, but the number of blades must be increased or the blade angle must be changed. I have to let it happen. However, the rotation speed is determined by the relationship between the load 1 and the motor 2 and cannot be changed. Furthermore, in the conventional configuration, the only way to increase the number of blades or adjust the blade angle was to replace the motor cooling fan 4.

Means to Solve the Problems In order to solve the above problems, the present invention uses a shape memory alloy in the motor cooling fan to automatically adjust the blade angle of the motor cooling fan depending on the motor ambient temperature. be.

Effect: With the above means, when the motor ambient temperature changes, the blade angle of the motor cooling 7-ang changes in response to the change, and the cooling air volume is made to correspond to the ambient temperature, resulting in an efficient cooling effect.

Example Hereinafter, an example of the operation of the present invention will be described with reference to FIG. 1.

This will be explained based on FIG. This embodiment only changes the material of the motor cooling fan in the conventional example,
Since the configuration is unchanged, the conventional example shown in FIG. 2 will be used as is.

FIG. 1 is a top view of the motor cooling fan. Figure 2 is a side view, and in this case there are four blades. 5 represents the wing and 6 represents the base. The angle between the base 6 and the wing 4 is the wing angle α
shall be.

Let αH be the blade angle that produces the maximum air volume when the ambient temperature of the motor 2, that is, the ambient temperature of the motor cooling fan 4, is at its highest, αL be the blade angle at the minimum air volume at room temperature, and α be the required blade angle at temperatures in between. Blade angle α at different temperatures
The motor cooling fan 4 is made of a shape memory alloy by storing the following information.

Effects of the Invention As described above, according to the present invention, instead of constantly sending the required amount of air at ambient temperature, it is no longer necessary to send a larger amount of air than necessary, thereby causing loss of motor output. Even if the motor malfunctions and the ambient temperature rises, the cooling air volume will still increase. Furthermore, effects such as expanding the usable range of the motor at ambient temperature can be obtained.

[Brief explanation of drawings]

Figure 1 is a top view of the motor cooling fan of the present invention, Figure 2 is a sectional view of the same side, Figure 3 is a sectional view of the same essential parts, and Figure 4 is the configuration of a conventional motor cooling fan, motor, and load. It is a diagram. 4...Motor cooling fan, 6...Base, 5...Blade. Name of agent: Patent attorney Ken Nakao and 1 other person 4-
- Motor; Figure 2 and Figure 3

Claims (1)

[Claims] A motor cooling device that includes a cooling fan using a shape memory alloy that can control the amount of motor cooling air depending on the ambient temperature around the motor.