Patent ID: 7479721
Filing Date: 2009-01-20
Classification: H02K

Abstract:
1. A motor comprising: a rotor part having a rotor shaft and a rotor magnet; a stator part which is oppositely disposed to the rotor magnet via a gap space; a bearing which rotatably supports the rotor shaft; a spring member which abuts with one end of the rotor shaft to urge the rotor shaft in an axial direction; a spring member side restricting part which is provided in the spring member to prevent fluctuation in a radial direction of the rotor shaft; a rotor shaft side restricted part which is provided in the rotor shaft and engages with the spring member side restricting part; a spherical recessed part which is formed in one of the rotor shaft side restricted part and the spring member side restricting part; and a spherical protruded part which is formed in the other of the rotor shaft side restricted part and the spring member side restricting part; wherein the spring member urges the rotor shaft in the radial direction; wherein the spring member side restricting part abuts with the rotor shaft side restricted part at a position deviated from a shaft center line of the rotor shaft to urge the rotor shaft in an axial direction and in a predetermined radial direction; and wherein an outer peripheral face of the rotor shaft is brought into contact with an inner peripheral face of a bearing part of the bearing at a contact position which is determined by the predetermined radial direction to regulate a contacting position of the rotor shaft with the bearing part for preventing fluctuation of the rotor shaft.