Patent ID: 7777381
Filing Date: 2010-08-17
Classification: H02K,H02P

Abstract:
1. A motor comprising: a first magnetic body; a second magnetic body; and a third magnetic body disposed between said first and second magnetic bodies, the third magnetic body being relatively movable in a prescribed direction in relation to said first and second magnetic bodies, wherein said first magnetic body and second magnetic body respectively comprise a structure in which a plurality of electromagnetic coils capable of being alternately excited to opposite polarities is disposed in order; said third magnetic body comprises a structure in which permanent magnets alternately magnetized to opposite polarities are disposed in order; and said first magnetic body and said second magnetic body are structured such that an electromagnetic coil of said first magnetic body and an electromagnetic coil of said second magnetic body are disposed so as to mutually possess an array pitch difference, said magnetic structure further comprising a coil exciting circuit for supplying an exciting current including frequency signals having different phases to the electromagnetic coils of said first and second magnetic bodies, wherein the pair formed from said first and second magnetic bodies and one side of said third magnetic body form a rotor, and the pair formed from said first and second magnetic bodies and the other side of said third magnetic body form a stator, wherein an equal number of magnet poles of the rotor and poles of the electromagnetic coil for the phase are formed, wherein the rotor is formed from a nonmagnetic material disc and a plurality of electromagnetic coils or permanent magnets, a rotation speed detector that detects the rotation speed of the rotor being set in a direction perpendicular to an axis of the rotor, and wherein said coil exciting circuit controls excitation of the electromagnetic coils of said first and second magnetic body via the exciting current supplied to the electromagnetic coils, the phase of the current being corrected based on a rotational speed of said rotor.