Patent ID: 7279816
Filing Date: 2007-10-09
Classification: H02K

Abstract:
1. A driving apparatus comprising: a rotor having a plurality of N-poles and S-poles on an outer surface, mutually arranged one N-pole after one S-pole with an equal intervals; a cylindrical magnetic body fixed around said rotor concentric with said rotor, which has a plurality of N-poles and S-poles on an inner surface facing said N-poles and S-poles of said rotor, mutually arranged one N-pole after one S-pole with an equal intervals; a plurality of magnetic shield bodies arranged between said rotor and said cylindrical magnetic body for controlling a magnetic flux between said rotor and said cylindrical magnetic body so that a constant rotation power is occurred on said rotor; wherein the number of respective N-poles and S-poles on said cylindrical magnetic body is the same as the number of respective N-poles and S-poles on said rotor and the total number of N-poles and S-poles on the cylindrical magnetic body is the same as the total number of shield bodies arranged between said rotor and said cylindrical magnetic body; and each shield body is capable of shielding a single N-pole or S-pole on said cylindrical magnetic body from a single N-pole or S-pole on said rotor.