Patent ID: 10491082

Abstract:
A permanent-magnet electric motor includes: a rotor; and a rotational-position detection sensor configured to detect a rotational position of the rotor. The rotor includes: a rotating shaft; an annular ferrite magnet disposed on an outer circumferential surface of the rotating shaft; and a rare-earth magnet disposed on an outer circumferential surface of the ferrite magnet, and a length from a center of the ferrite magnet in an axial direction of the ferrite magnet to an end face of the ferrite magnet on a side of the rotational-position detection sensor in the axial direction of the ferrite magnet is longer than a length from a center of the rare-earth magnet in an axial direction of the rare-earth magnet to an end face of the rare-earth magnet on a side of the rotational-position detection sensor in the axial direction of the rare-earth magnet.