Will the motor winding burn out in the no-load state?_Wolong Nanyang Explosion-proof Motor, China Motor Manufacturer

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Will the motor winding burn out in the no-load state?

source：未知 time：2025-02-24 14:37nbsp; click：

Compared with the load, the no-load state of the motor is the running state without any load. Theoretically, for motor products, there is a pure no-load state only when the motor is running alone. For the motor of the towing equipment, even if the towed equipment is not loaded, the equipment connected to the motor is also a load relative to the motor, but the load size corresponding to different equipment is different, that is, the motor is in a light-load state.

Let's take the three-phase asynchronous motor as an example. When the motor is applied with rated voltage and the motor is not loaded, the current of the motor is only 1/3 to 1/2 of the rated current. The motor with few poles and high speed will be smaller, while the motor with many poles and low speed will be slightly larger; the no-load state under rated voltage will not cause the problem of winding burning; but the low voltage is not enough to start the motor, and the no-load operation exceeding the rated voltage may cause the winding burning problem because the current exceeds the rated current.

In addition to the three-phase motor, we also talked about the characteristics of the old washing machine that cannot run no-load in the previous article. The main reason is that in the no-load state, the characteristics of the non-circular magnetic field of this type of motor cause the motor no-load current to be greater than the rated current in most cases.

For single-phase shaded-pole motors, the starting and running characteristics of such motors are relatively poor because the motor's spatial magnetic field contains many harmonic components, the axis of the motor's main winding and auxiliary winding is less than 90 degrees apart in electrical angle, and the leakage magnetic field caused by the shaded-pole coil and magnetic shunt plate. The shaded-pole coil increases the current and loss in the motor winding. The no-load current of such motors is already very large, and the motor current does not change significantly when the load increases. Therefore, such motors are not suitable for no-load or light-load operation, but the motor is not prone to winding burnout when it is overloaded and decelerated.
General Electric Ac Motor, General Electric Electric Motors, General Electric Synchronous Motor

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