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Affect motor heating? motor heating principle and reasonable range
Aug 31, 2016

1, the principle of heat:


We usually see the various types of motor, are core and Windings. Winding has resistance, power will produced loss, loss size and resistance and current of square into is proportional to the, this is we often said of copper loss, if current not standard of DC or sine wave, also will produced harmonic loss; core has magnetic delay Eddy effect, in make variable magnetic field in the also will produced loss, its size and material, current, frequency, voltage about, this called iron loss. Iron loss and copper loss will manifested in the form of heat, thus affecting the efficiency of the motor. Stepping Motor General pursuit of precision and torque output, efficiency is quite low, the current is always large and high harmonic components, the frequency of the alternating current also changes with the speed, thus stepping motor General fever and serious than AC motors.


2, rational range of stepper motor heating:


Heat allows the extent to which, depending on the motor insulation class. Internal insulation at high temperatures (above 130 degrees) will be destroyed. So long as it does not exceed 130 degrees, the motor will not be damaged rings, when the surface temperature is below 90 degrees. Therefore, the stepper motor surface temperature in 70-80 is normal. Simple method of measuring temperature thermometer useful points, you can roughly guess: hands can touch more than 1-2 seconds, no more than 60 degrees; only touched with his hand, approximately 70-80 degrees; drop a few drops rapidly and gasification are above 90 degrees.


3, heat change with the speed of step motor:


When using constant-current drive technology, stepper motors under steady-state and low speed, currents will maintain a constant to maintain constant torque output. High speed to a certain extent, increased the motor back-EMF, current will gradually decrease and torque will decline. Therefore, the fever due to copper loss, he was associated with the speed. Static high general fever and low speed, high speed low fever. But the iron loss (although a smaller proportion of) changes the situation was somewhat different, and motor heat as a whole is the sum of the two, so these are just general.


4, effects of heat:


Heat does not affect the life expectancy of the motor, most of our clients don't have to ignore. But in severe cases can have a negative impact. Such as motor parts within different coefficient of thermal expansion stress changes and internal air-gap change affects the dynamic response of the motor, high speed easily out of step. And in some places do not allow excessive heating of the motor, such as medical devices and high-precision test equipment. Fever should make the necessary control of the motor.


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