Harmonic electromagnetic noise and vibration

Update:17 Aug 2018
Summary:

When the ordinary asynchronous motor is powered by the […]

When the ordinary asynchronous motor is powered by the inverter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated. Each time harmonic contained in the variable frequency power supply interferes with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces.

When the frequency of the electromagnetic force wave is equal to or close to the natural vibration frequency of the motor body, a resonance phenomenon will occur, thereby increasing noise. Since the operating frequency range of the motor is wide and the range of the rotational speed is large, the frequencies of various electromagnetic force waves are difficult to avoid the natural vibration frequency of each component of the motor.