Patent ID: 7626291
Filing Date: 2009-12-01
Classification: H02K

Abstract:
1. A drive apparatus comprising: a magnet having a substantially cylindrical configuration and including a first magnetized pattern portion circumferentially magnetized into different poles and a second magnetized pattern portion circumferentially magnetized into different poles with a phase difference relative to the first magnetized pattern portion, the first magnetized pattern portion and the second magnetized pattern portion being circumferentially juxtaposed to each other; a rotor yoke disposed on one diametrical side of said magnet and including magnetic pole portions circumferentially formed to face the first and second magnetized pattern portions of said magnet; a first stator yoke fixed on the other diametrical side of said magnet and disposed to cooperate with said rotor yoke to sandwich therebetween a part of said magnet in which the first magnetized pattern portion is formed; a second stator yoke fixed on the other diametrical side of said magnet and disposed to cooperate with said rotor yoke to sandwich therebetween a part of the magnet in which the second magnetized pattern portion is formed; a first coil adapted to energize a part of the magnetic pole portions of said rotor yoke which faces said first stator yoke; and a second coil adapted to energize a part of the magnetic pole portions of said rotor yoke which faces said second stator yoke.