Patent ID: 6555940
Filing Date: 2003-04-29
Classification: H02K

Abstract:
A permanent magnet rotor comprising a rotor core that comprises a plurality of magnetic poles, the rotor core comprising a plurality of permanent magnets embedded in slit sections formed in layers for each magnetic pole, the layers comprising a radially innermost layer, a least one intermediate layer, and a radially outermost layer, the radially innermost layer and the at least one intermediate layer each including at least one vacant slit section in which no permanent magnet is embedded, the vacant slit section in the radially innermost layer being larger than the vacant slit section in the intermediate layer, the permanent magnets embedded in the slit sections in each layer generating magnetic flux, the permanent magnets embedded in the slit sections of the radially innermost layer generating more magnetic flux than the permanent magnets embedded in the slit sections of the at least one intermediate layer.