Patent ID: 7893580

Claim:
A positioning mechanism of a resolver, which is disposed at a housing member for receiving a brushless motor which has a rotor and a stator having a plurality of coils to rotate the rotor by alternately changing electrical conduction to the coils, a resolver stator received in the housing member and a resolver rotor which is coupled and fixed at a constant circumferential position with respect to the rotor to rotate together with the rotor and which detects a rotational position of the rotor with respect to the stator, a holding portion holding the resolver stator being formed in the stator, and a positioning member for positioning the resolver stator with respect to the stator being coupled and fixed to the stator to be positioned at a constant circumferential position with respect to the stator, and wherein the resolver stator is held by the holding portion so as to be positioned at the constant circumferential position with respect to the stator, the positioning member being constructed with bobbins which are positioned at constant circumferential positions with respect to the stator and a bus ring holder which is positioned at a constant circumferential position with respect to the bobbins, and wherein the holding portion is formed in the bus ring holder.