Vibration motor manufacturers brief spring damper unit is not good, there are some noise and vibration. Change a big fan of the pulley, so that the speed is reduced to reduce the amount of wind. Holes and cracks on the insulation. 
 Surge voltage generated by the distributed capacitance and inductance of the output line resonance, superimposed on the output voltage. Transistors, IGBT switching frequency, the higher the longer the wire, the higher the surge voltage generated the largest, it can produce two times the DC voltage surge voltage. 
 Countermeasures: high dielectric strength of the motor and AC output reactor (impedance of 3%) plus the output inductor L and capacitor C, resistor R filter. If the insulation problem in the short term problems. 
 How to avoid the vibration motor insulation breakdown accident? 
 Surge voltage generated by the distributed capacitance and inductance of the output line resonance, superimposed on the output voltage. Transistors, IGBT switching frequency, the higher the longer the wire, the higher the surge voltage generated the largest, it can produce two times the DC voltage surge voltage. 
 Countermeasures: high dielectric strength, vibration motor and AC output reactor (impedance of 3%) plus the output inductor L and capacitor C, resistor R filter. * If the insulation problems, problems in the short term. 
 Source: Walker County, Xinxiang City, Rising Sun Motor Factory http://www.xxxrdj.com 
 Tel: 13503449954 Address: Walker County, Henan Province, Xigong