Patent ID: 7019427
Filing Date: 2006-03-28
Classification: H02K

Abstract:
1. A synchronous motor comprising a stator including a stator iron core having a winding wound therearound, the stator iron core having an inner cylindrical surface; a rotor including a rotor iron core having a rotor comprising a plurality of electromagnetic steel plates, the rotor is located within the space defined by the inner cylindrical surface of the stator core, the rotor iron core including a magnet retaining portion defining magnet retaining slots, a magnetic flux short-circuit preventive portion coupled with the magnet retaining portion and defining magnetic flux short-circuit preventive holes communicating with the magnet retaining holes, and a rotor outer-end portion coupled with the magnetic flux short-circuit preventive portion and defining holes communicating with the magnetic flux short-circuit preventive holes; and a plurality of permanent magnets embedded within the magnet retaining slots in the magnet retaining portion of the rotor, the plurality of permanent magnets defining rotor magnetic poles; wherein the magnetic flux short-circuit preventive holes are smaller than the magnet retaining slots such that the permanent magnets are axially positioned by allowing the permanent magnets to engage the outer edges of the magnetic flux short-circuit preventive holes.