农用电动机在正常运行时，一般只能听到一种均匀的“呼呼”声音。而大型电机还可能产生一种呼啸声，这是由风扇所发生的正常的声音。有些电机有时发出有规律的“哼”声，这是由于定子铁芯硅钢片在交变磁场中振动形成的，这种声音和所通过交流电流的频率相呼应，也是一种正... In normal operation, agricultural motors generally can only hear a uniform “whirring” sound. The large motor may also produce a whistling sound, which is the normal sound generated by the fan. Some motors sometimes emit a regular “hum” sound, which is due to the stator core silicon steel in the alternating magnetic field formed by vibration, which sounds and the frequency of alternating current echoes, but also a positive ...