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Methods for improving the operation reliability of electromagnetic speed-adjusting asynchronous motor

Methods for improving the operation reliability of electromagnetic speed-adjusting asynchronous motor

Methods for improving the operation reliability of electromagnetic speed-adjusting asynchronous motor

The electromagnetic speed regulating asynchronous motor is composed of an electromagnetic slip clutch and a control device of a common squirrel cage asynchronous motor (primary mover). Because the structure of the motor is that the electromagnetic power is transmitted outside the two bearing support points, it is easy to generate unilateral magnetic tension caused by uneven air gap. When the load at the output end increases, the motor shaft bends, resulting in armature and magnetic pole sweeping. Severe air gap unevenness will cause the speed of the motor to oscillate at light or even no-load, the speed cannot be adjusted, and it will be accompanied by a call. When it is found that the motor is running (especially at startup), speed oscillations and other abnormalities occur. To determine whether the air gap is caused by unevenness, you can cut off the power of the prime mover and slowly adjust the speed control knob to gradually increase the exciting current from zero. Rotate the shaft of the prime mover relative to the motor output shaft by hand. When the magnetizing current can still rotate relatively above 1.5 times of the rated current, the air gap is considered to be relatively uniform, otherwise the air gap is poor in uniformity and cannot be operated reliably.
In order to solve this main quality problem, the following two simpler methods can be used to overcome the above drawbacks through investigation and research and practice. But the most fundamental solution is how to increase the stiffness of the supporting motor shaft itself. In some cases, by adjusting the deflection of the flange support of the prime mover facing the vertical plane of the shaft center (shout 0.04 ~ 0.06), the improvement is achieved and the overload capacity of the motor is also improved. It is also possible to put a thickened sleeve on the front end of the motor shaft.

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