ELECTRIC MOTOR

PROBLEM TO BE SOLVED: To provide an electric motor in which the strength of a torque transmission member can be ensured, the weight of the electric motor can be reduced and a manufacturing cost can be reduced by reducing portions requiring machining accuracy in a yoke and drive plates are reduced. SOLUTION: The electric motor is provided with: an outer circumferential side rotor 21; an inner circumferential side rotor 22 provided coaxially with the outer circumferential side rotor 21; drive plates 14A, 14B provided respectively on both ends of a shaft direction of the outer circumferential side rotor 21, and transmitting a driving force of the outer circumferential side rotor 21 to the rotating shaft 12; long hole-like through-holes 51 formed at a predetermined interval in the circumferential direction on the yoke 23 of the outer circumferential side rotor 21; and torque transmission pins 61 inserted into the through-holes 51 and each having both ends inserted or press-fitted into the drive plates 14A, 14B. Each of the through-holes 51 has a dimensional width B1 larger than the diameter D of a torque transmission pin 61 and a circumferential width B2 substantially the same as the diameter D of the torque transmission pin 61. COPYRIGHT: (C)2010,JPO&INPIT