Patent ID: 7193343
Filing Date: 2007-03-20
Classification: B60L,H02K,Y02T

Abstract:
1. An electric motor comprising: a plate formed of metal, the plate including a first surface and a second surface, which is opposite to the first surface; a stator secured to the first surface of the plate, the stator including a stator core and a coil wound about the stator core; a rotor rotatably arranged inward of the stator, the rotor having a rotor core and a magnet attached to the rotor core, wherein the rotor includes a rotary shaft, which rotates integrally with the rotor core, the rotary shaft having axial ends; a control circuit for supplying a drive current to the coil of the stator in accordance with the rotational position of the rotor; a circuit substrate attached to the second surface of the plate, wherein the circuit substrate has a first substrate surface and a second substrate surface, the first substrate surface contacts the second surface of the plate, and the second substrate surface is opposite to the first surface; an accommodating portion formed in the plate for accommodating a rotation sensor of the electric motor; and said rotation sensor, for detecting the rotational position of the rotor, wherein the rotation sensor is attached to the first substrate surface while accommodated in the accommodating portion, wherein the control circuit is attached to the second substrate surface, wherein the rotation sensor sends a detection signal of the rotational position of the rotor to the control circuit, wherein the first substrate surface of the circuit substrate has a portion that faces one of the axial ends of the rotary shaft, and wherein the portion of the first substrate surface contacts the second surface of the plate.