Patent ID: 7679244

Claim:
A motor comprising: a rotor having a rotor shaft and a permanent magnet which is fixed to an end part of the rotor shaft; a stator which is disposed around the rotor; a bearing for supporting the end part of the rotor shaft in an axial direction; a bearing holder which is provided with a cylindrical holding part for holding the bearing movably in the axial direction; a pressurization member which is disposed on an outer side in the axial direction of the bearing holder for urging the bearing to the rotor shaft side; and a recessed part which is formed in the permanent magnet, in which the bearing and the cylindrical holding part of the bearing holder are accommodated; wherein the rotor shaft penetrates one side of the permanent magnet into the recessed part so that an end portion of the rotor shaft, defined as that portion of the rotor shaft which is located inside the recessed part of the permanent magnet, has an axial length which is shorter than an axial length of the recessed part formed in the permanent magnet; wherein both the bearing and the cylindrical holding part of the bearing holder are accommodated within the recessed part formed in the permanent magnet so that the end portion of the rotor shaft faces the bearing in the axial direction; and wherein the bearing is movably held in the axial direction by the cylindrical holding part in a state that the bearing is urged by the pressurization member and thus the end part of the rotor shaft is supported by the bearing in the axial direction.