Research status and development trend of motor cooling system

An efficient and reliable heat dissipation system is an important foundation for suppressing the temperature rise of the motor, improving the operating efficiency and power density of the motor, improving the stability of the motor operation and extending the life of the motor. Air-cooled, liquid-cooled, evaporative cooling and additional heat path enhanced heat dissipation systems play an important role in their respective application fields and have achieved significant cooling effects. According to the application scenarios of the motor, heating power and production costs, etc., selecting the appropriate The heat dissipation system is the key to achieving efficient heat dissipation of the motor. 

At present, the motor cooling system is gradually developing in the direction of high efficiency, high reliability and high integration with the motor. Combined with the current research status and development trend of the current motor cooling system, research can be carried out in the following aspects in the future.

(1) Study the relationship between the fin size structure, fin distribution position and wind speed of the air-cooled heat dissipation system and the heat dissipation efficiency, and establish and perfect the relationship model between the fin structure parameters and the heat dissipation efficiency and production cost. The air-cooled heat dissipation system has an irreplaceable position in the field of low-power motor heat dissipation, and it is of great significance to improve its heat dissipation efficiency and reduce its production cost. Establish and improve the relationship model between fin structure parameters, heat dissipation efficiency, and production cost, and further promote the development of air-cooled heat dissipation systems in the direction of high heat dissipation efficiency and low production costs.

(2) Establish a theoretical model between the geometric parameters of the liquid cooling system's flow channel, the cooling efficiency, and the pressure drop of the water channel. The geometric parameters of the runner are the key factors that affect the heat dissipation efficiency and the pressure drop of the water channel. At present, the influence of the finite element simulation method on the heat dissipation efficiency and the pressure drop of the water channel is mainly studied, and there is a lack of integral theoretical models.

(3) Establish a complete gas-liquid two-phase flow heat transfer model to improve the degree of integration of evaporative cooling technology in the motor system. Evaporative cooling technology has extremely high heat dissipation efficiency and has been widely used in the heat dissipation system of megawatt generator sets. At present, the heat transfer theory of evaporative cooling technology for gas-liquid two-phase flow has yet to be perfected. The degree of integration of the system will help the application of evaporative cooling technology in the heat dissipation system of a kilowatt motor.

(4) Systematically study the influence of additional heat circuits on the cooling efficiency of the motor cooling system,especially phase change devices. 

In the motor design stage, fully consider the suppression effect of the additional heat circuit on the motor temperature rise, adjust the motor electromagnetic scheme to increase the motor power &density, optimize the motor structure to increase the degree of integration of the thermal conductive glue, the phase change device and the motor, and enhance the phase change to enhance heat dissipation. The reliability of the system promotes the industrial application.