机械共振作用

当电机运行中的机械系统所受激励的频率，与该系统的某个阶段的固有频率相接近时，将会发生明显的共振现象，出现明显的位移共振，有时会因为振动作用而产生比较明显的声音。电机启动或断电运行过程中，所发生的“抖动”就是一种共振的具体表现。

该类问题在变频电机的使用过程中也时有发生，变频电机可能在某些频段的运行效果特别好，而在其他频段可能存在明显的电磁噪声，其根本的原因是由于电磁共振的作用。

Mechanical resonance effect
When the excitation frequency of the mechanical system in operation of the motor is close to the natural frequency of a certain stage of the system, obvious resonance phenomenon will occur, with obvious displacement resonance, and sometimes more obvious sound will be produced due to vibration. The vibration that occurs during the starting or power-off operation of the motor is a specific manifestation of resonance.
This type of problem also occurs during the use of variable frequency motors. Variable frequency motors may have particularly good operating effects in certain frequency bands, while there may be obvious electromagnetic noise in other frequency bands, and the fundamental reason is due to the effect of electromagnetic resonance.