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To improve the heat dissipation of motor, there are 3 basic ways of heat dissipation: conduction, convection and radiation. The working process of motor in electric energy conversion and kinetic energy due to reasons of copper loss, iron loss, would produce a lot of heat, if the heat can not be timely through the way to the surface conduction of the motor, and through the method of heat convection or heat radiation emitted into the surrounding medium, the temperature will be inside the motor winding continue to rise, causing the motor can not work normally, or even burned. In the condition of constant calorific value of the motor, in order to lower the temperature of the motor winding, it is the key to improve the internal and external heat conduction and heat dissipation of the motor.
The ability to transfer heat to a body of low temperature due to the temperature difference between heat transfer and heat transfer. The heat transfer capacity of conduction is related to the thermal conductivity of materials. High thermal conductivity material, fast heat transfer, heat dissipation ability. The heat conductivity of aluminum is second only to that of copper, which is better than that of brass, but copper is expensive, which is why heat sinks generally use aluminum instead of copper material, which is better than its thermal conductivity. In some special occasions where high heat dissipation is required, copper is used as radiator. For ordinary flat type asynchronous motor temperature rise experiment, we noticed that when the motor reaches the temperature equilibrium, the motor winding temperature is high, the insulation class B at 100 degrees Celsius, but the motor surface temperature is slightly lower at 75 degrees Celsius, while the bottom temperature of the motor is significantly lower than the upper surface, ca. at about 50 DEG C, the heat generated by the motor winding insulation, etc., after the core intermediary conduction effect is not ideal, there is a bottleneck in heat transfer, motor heat not effectively transmitted to the heat sink.
