Patent ID: 7573164
Filing Date: 2009-08-11
Classification: H02K

Abstract:
1. A driving apparatus comprising: a first cylindrically shaped magnet whose outer circumferential surface is alternately magnetized as different polarities in the circumferential direction; a second cylindrically shaped magnet whose inner circumferential surface is alternately magnetized as different polarities in the circumferential direction; a rotor in which a first magnetic pole portion made of a soft magnetic material opposite to the outer circumferential surface of the first magnet and a second magnetic pole portion made of a soft magnetic material opposite to the inner circumferential surface of the second magnet are integrally formed; a stator for fixing the first and second magnets to the same axis to rotatably support the rotor; a first coil fixed to the stator to magnetically excite the first magnetic pole portion of the rotor; and a second coil fixed to the stator to magnetically excite the second magnet pole portion of the rotor.