General Specification Cold insulation resistance of the motor conductive part to the housing is no less than 100M¦¸ Insulation Dielectric strength:the conductive part and the housing of the motor with stand 500V lasting 1min. for pressure proof experiment but can not be punctured, when the rated voltage¡Ü60V; the conductive part and the housing of the motor with stand 1500V lasting 1min. for pressure proof experiment but can not be punctured, when the rated voltage>60V Temperature 75k Noise 40dB.