Patent ID: 6762526
Filing Date: 2004-07-13
Classification: H02K

Abstract:
A multi-phase flat-type PM stepping motor, comprising:a first motor unit that comprises: a first stator unit having a plurality of air-core coils that are radially arranged on a first isolating magnetic disc; and a first rotor unit having a plurality of permanent magnets that are alternatively magnetized in N-pole and S-pole and radially arranged on a second magnetic disc with a predetermined air gap with respect to the coil surface of said first stator unit, said second magnetic disc being fixed to a rotation axis; and a second motor unit that comprises: a second stator unit having a plurality of air-core coils that are radially arranged on a third isolating magnetic disc; and a second rotor unit having a plurality of permanent magnets that are alternatively magnetized in N-pole and S-pole and radially arranged on a fourth magnetic disc with a predetermined air gap with respect to the coil surface of said second stator unit, said fourth magnetic disc being fixed to said rotation axis; a non-magnetic disc arranged between said first and second motor units, wherein said first and second stator units are fixed to the different sides of said non-magnetic disc and said first and second rotor units face each other across said first and second stator units.