Multi-phase flat-type PM stepping motor and driving circuit thereof

摘要

A stepping motor includes a first motor unit having a first stator unit and a first rotor unit and a second motor unit having a second stator unit and a second rotor unit. The first stator unit has air-core coils that are radially arranged on a first isolating magnetic disc. The first rotor unit has 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 to the first stator unit. Similarly, the second stator unit has air-core coils on a third isolating magnetic disc and the second rotor unit has permanent magnets on a fourth magnetic disc. The first and second stator units are fixed to the different sides of a non-magnetic disc. The first and second rotor units are fixed to a rotation axis and face each other across the first and second stator units.