Patent ID: 6104109
Filing Date: 2000-08-15
Classification: H02K

Abstract:
A motor comprising:a rotor;a rotatable rotor shaft;magnets;a yoke which forms a part of a magnetic circuit and is formed from a single plate, the yoke comprising:a bottom portion having a hole in which an elastically deformable holding portion for holding a bearing member which supports said rotatable rotor shaft is provided, said bearing member being rotatable around an axis; anda side wall portion which extends integrally from a portion of said bottom portion, and which is bent substantially perpendicular with respect to the bottom portion, and at least a portion of said side wall portion bent along a concentric circle with respect to the hole and holding the magnets at an inner side of the side wall portion, and having a uniform thickness along an axial direction of the rotatable rotor shaft; anda cylindrical case comprising:a holding chamber which holds an outer peripheral surface of the side wall portion of the yoke;a liquid pressure generating chamber;an inner wall which partitions said liquid pressure generating chamber and has a hole through which the rotatable rotor shaft passes; andan impeller located within the liquid pressure generating chamber and mounted to the rotor rotating shaft.