Patent ID: 7365458

Claim:
An inner rotor type, brushless DC motor comprising: a stator having a stator core wound with a coil; a housing, having a bottom, formed by covering said stator with a molding resin comprising an electrically insulating, unsaturated polyester; a circular-shaped metal bracket covering an opening portion of said housing and arranged at a side portion of said housing; a rotor held to be freely rotatable by a pair of bearings inserted on a rotary axis for said rotor, wherein at least one of said bearings is fixed by said bracket at a central portion of said bracket; an earth electrode made of metal, having a first end going through said housing and abutting at said stator core, and a second end contacting said bracket, and an earth cord installed at said bracket and said earth electrode, wherein while said motor is controlled by PWM (PULSE WIDTH MODULATION) control and operates at a high voltage, an electric current occurs in said stator core and moves to said metal bracket through said earth electrode and flows to ground via said earth cord, thereby preventing a current flow, through said pair of bearings, from said stator core to said rotary axis having a relatively lower voltage.