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Ways to improve the operational reliability of electromagnetic speed control asynchronous motor

Ways to improve the operational reliability of electromagnetic speed control asynchronous motor

Ways to improve the operational reliability of electromagnetic speed control asynchronous motor

The electromagnetic speed regulation asynchronous motor is composed of three parts: the ordinary squirrel-cage asynchronous motor (primary motive) electromagnetic slip clutch and control device. Since the structure of the motor is that the electromagnetic power is transmitted outside the support points of the two bearings, the single-sided magnetic pulling force caused by the uneven air gap is easily generated. When the output load increases, the motor shaft bends to produce an armature and magnetic pole broom. Severe air gap unevenness will cause the motor to oscillate at light load and even at no load, and the speed cannot be adjusted, accompanied by a sound. When it is found that the motor is running (especially at start-up), the speed oscillation occurs, etc., in order to determine whether the air gap is uneven, the prime mover power supply can be cut off, and the speed control knob can be slowly adjusted to gradually increase the excitation current from zero. The shaft of the prime mover is rotated relative to the output shaft of the motor by hand. When the excitation current is more than 1.5 times the rated current and can still rotate relative to each other, it is considered that the air gap is relatively uniform, otherwise the air gap uniformity is poor and cannot be operated reliably.
In order to solve this main quality problem, the following two simple methods can be used to overcome the above drawbacks through investigation and research. But the most fundamental solution is how to improve the stiffness of the motor shaft itself. In some cases, by adjusting the yaw of the prime mover flange bearing facing the vertical plane of the shaft center (shocking 0.04 to 0.06), the improvement is made, and the overload capability of the motor is also improved. At the front end of the motor shaft, a thickened bushing can be applied.

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