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At what temperature can the motor work normally? How high temperature can the motor run? This problem is a common problem faced by companies using electric motors. The main consideration for the working temperature of the motor is the maximum temperature that the paint skin on the rotor can withstand. If it exceeds this temperature, the paint skin is easily damaged and malfunctions. If the maximum allowable working temperature of the motor is 150 degrees Celsius, and the operating environment is 30 degrees Celsius, then the maximum allowable temperature rise can only be 120k.
The temperature rise is the temperature difference between the motor and the environment, which is caused by the heating of the motor. The iron core of the motor in operation will produce iron loss in the alternating magnetic field, copper loss will occur after the winding is energized, and other stray losses. These will increase the temperature of the motor. On the other hand, the motor will also dissipate heat.
When heat generation and heat dissipation are equal, the equilibrium state is reached, and the temperature no longer rises and stabilizes at a level. When the heat generation increases or the heat dissipation decreases, the balance will be broken, and the temperature will continue to rise, and the expansion of the temperature difference will increase the heat dissipation, and reach a new balance at another higher temperature. However, the temperature difference at this time, that is, the temperature rise, has increased compared to before. Therefore, the temperature rise is an important indicator in the design and operation of the motor, marking the degree of heat generation of the motor. During operation, if the temperature rise of the motor suddenly increases, It means that the motor is faulty, or the air duct is blocked or the load is too heavy.
For a normally operating motor, theoretically, its temperature rise should be independent of the ambient temperature under rated load, but in fact it is still affected by factors such as ambient temperature.
(1) When the temperature drops, the temperature rise of the normal motor will be slightly reduced. This is because the winding resistance r decreases and the copper loss decreases. When the temperature drops by 1℃, r drops by about 0.4%.
(2) For self-cooling motors, the temperature rise will increase by 1.5 to 3°C every time the ambient temperature increases by 10°C. This is because the copper loss of the winding increases with the temperature rise. Therefore, temperature changes have a greater impact on large motors and enclosed motors.
(3) For every 10% higher air humidity, the temperature rise can be reduced by 0.07～0.38℃, with an average of 0.19℃ due to the improvement of heat conduction.
(4) The altitude is 1000 m as the standard. For every liter of 100 m, the temperature rise will increase by 1% of the temperature rise limit value.