Transducer is applied to automatic control system extensively, but it causes certain electromagnetic interference to control circuit and electricity equipments around it and sometimes may result in wrong action.

• 摘要变频器在现代控制中应用越来越广泛，但变频器将对控制电路及周围电气设备产生一定的电磁干扰，有时可能引起某些设备的误动作。