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Three Common Cooling Methods for Low-voltage AC Motors


As we all know, the operation process of the AC motor i […]

As we all know, the operation process of the AC motor is actually a process of mutual conversion of electrical energy and mechanical energy. In this process, it will also inevitably produce some losses. Most of these losses will be converted into heat, which will cause the working temperature of the motor winding, iron core and other components to increase.

Because the insulation material used by the AC motor has temperature limitations, the task of motor cooling is to dissipate the heat generated by the internal loss of the motor, maintain the temperature rise of various parts of the motor within the range specified by the standard, and strive to homogenize the internal temperature .

AC motors usually use gas or liquid as the cooling medium. Air and water are common. Corresponding ones are called air cooling or water cooling. Commonly used for air cooling are fully enclosed air cooling and open air cooling; water cooling is commonly used for water jacket cooling and heat exchanger cooling.

1.IC01 natural cooling (surface cooling)

For example, Siemens compact 1FK7 / 1FT7 servo motor. Note: When the surface temperature of this type of motor is high, it may affect peripheral equipment and materials. Therefore, when applying in certain industries, the negative impact of motor temperature should be avoided through the installation of the motor and moderate derating.

2.IC411 self-cooling (self-cooling)

IC411 moves the air by the rotation of the motor itself to achieve cooling. The speed of air movement is related to the speed of the motor.

IC411 and IC416 are cooling methods commonly used in low-voltage AC asynchronous motors, which are cooled by fans blowing fins on the surface of the motor.

3.IC416 forced fan cooling (strong cooling or independent fan cooling)

IC416 contains an independently driven fan, which ensures a constant air volume regardless of the motor speed.

Motor cooling fan type

The design of the fan is based on the principle of minimum loss to obtain the maximum cooling effect, and the streamlined curved surface design is mostly used to maximize the fan's ventilation efficiency while also reducing ventilation noise.


1. Some motor self-cooling fans are unidirectional. When ordering the motor, you need to indicate the actual direction of rotation required by the motor.

2. For Siemens standard motor products, the forced cooling fan is not a standard configuration, but an option. It should be determined according to the actual load type and speed range.