1. Process introduction

As we all know, the operation process of the motor is actually a process of mutual conversion of electric energy and mechanical energy, which will inevitably produce some losses. Most of these losses will be converted into heat, resulting in the increase in the working temperature of the motor winding, iron core and other components, which will affect the service life and performance, so the motor is reasonably cooled.

2. Motor cooling mode

The design of the motor cooling scheme needs to consider many factors, including the power of the motor, the operating environment, the nature of the coolant, and so on. Here are some general motor cooling solutions:

Natural cooling:

For low-power motors, natural cooling is usually used. This way does not require additional cooling equipment, and the heat generated by the motor naturally dissipated through the surrounding air or other media.

Air blast cooling:

Forced air cooling is the use of fans or other ventilation equipment to blow air to the motor surface, accelerate the heat dissipation of the motor. This cooling method is suitable for medium and high power motors.

Hydrocooling:

Water cooling is the use of circulating water or other coolant through the outer water sleeve to absorb the heat generated by the motor. Water cooling technology is the mainstream heat dissipation mode at present, but it cannot directly cool the heat source. The heat at the winding needs to be transferred through the insulation layer in the groove and the motor stator to the shell to be taken away by water. The transmission path is long, the heat dissipation efficiency is low, and the coordination tolerance between the components affects the thermal resistance of the transmission path.

Oil cooling:

Oil cooling is the use of lubricating oil or other special cooling oil to absorb the heat generated by the motor. The advantages of oil cooling and water cooling are that the insulation performance is good. the boiling point and setting point of oil are higher than water, so that the coolant is not easy to freeze at low temperature and not easy to boil at high temperature. Oil cooling is the most efficient at the present stage, because it is hardly conductive, and it can immerse most of the motor in the lubricating oil, to achieve zero contact heat exchange.

When selecting the motor cooling scheme, it needs to be comprehensively considered according to the specific parameters and operation needs of the motor. We can design the refrigeration technical scheme according to the actual parameters and working conditions.