Analysis of the causes of electromagnetic noise in explosion-proof motors

1. The length of the rotor and the stator of the explosion-proof motor is not well matched: the length of the rotor refers to the distance from one bearing to another bearing; the length of the stator refers to the distance from one bearing chamber to another bearing chamber. Under normal circumstances, the length of the stator is slightly longer than the length of the rotor. If the difference is too large, a low "hum" sound (or empty sound) will appear.
2. Axial displacement of the rotor: This displacement may also generate electromagnetic noise, which will increase the no-load current and reduce the electromagnetic performance of the motor.
3. Improper matching of stator and rotor slots: During the assembly process, another rotor was installed by mistake.
4. The air gap between the stator and the rotor is uneven: the stator and the rotor are out of round, and the shaft may be slightly bent, etc.
In addition, the motor winding phase loss, inter-turn short circuit, inter-phase short circuit, overload operation, etc., can cause electromagnetic noise.
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