Patent ID: 7891461

Claim:
A motor rotation angle detection device, comprising: a resolver which is operable to detect a rotation angle of a motor generating an assist torque for steering road wheels, the resolver including an annular rotor disposed inside an annular stator with an air gap interposed between an outer circumferential surface of the rotor and an inner circumferential surface of the stator, so that the stator and the rotor are rotatable relative to each other, wherein a rotor supporting member is connected to a rotary shaft of the motor, wherein the rotor supporting member and the rotor are integrally formed as portions of a unitary member, and the rotor extends out from an axial end portion of the rotor supporting member so as to surround an outer periphery of the rotary shaft in a manner such that an internal gap is formed between an inner circumferential surface of the rotor and an outer circumferential surface of the rotary shaft which is opposed to the inner circumferential surface of the rotor in a radial direction.