Patent ID: 6605883
Filing Date: 2003-08-12
Classification: H02K,H02P

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; 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, wherein said first and second motor units are coaxial and symmetric with each other about a non-magnetic disc arranged therebetween.