Patent ID: 6909212

Claim:
An electric motor comprising: a rotor that is rotated upon energization of the electric motor; an output shaft that is secured to the rotor to rotate integrally with the rotor; a circular sensor plate that is secured to the output shaft to rotate integrally with the output shaft; a stator that has a stator base, which includes a tubular portion, wherein the tubular portion has a shaft hole, and the shaft hole penetrates through the tubular portion in an axial direction of the output shaft and rotatably receives the output shaft; and a circuit board that is secured to the stator base and includes at least one rotation sensor, which outputs a signal that corresponds to a rotational speed of the sensor plate, wherein each rotation sensor includes two opposed arms, which are spaced from each other in a direction parallel to the axial direction of the output shaft and receives a portion of the sensor plate between the opposed arms, and wherein the circuit board has a tubular portion receiving opening, which penetrates through the circuit board in the axial direction of the output shaft to receive the tubular portion of the stator base and which is elongated in a direction perpendicular to the axial direction of the output shaft, so that at least a portion of an inner peripheral edge of the tubular portion receiving opening is spaced away from the tubular portion.