Patent ID: 6384496
Filing Date: 2002-05-07
Classification: H02K

Abstract:
A rotary electric motor having a stator and a rotor separated from each other by a radial air gap for electromotive interaction therebetween, whereinsaid stator comprises a first number of permanent magnet poles substantially similar to each other in configuration and being positioned substantially equidistantly with alternating polarity along the radial air gap, the permanent magnet poles being spaced from each other; said rotor comprising a second number of salient poles divided in groups that are distributed equidistantly along the radial air gap, the groups comprising magnetic circuits isolated from each other, the salient poles having windings thereon, the rotor salient poles and the stator poles all having pole faces of approximately the same length along the air gap; and position sensing and switching means for applying energization current to and withholding energization current from the windings of each group of salient poles in accordance with relative position between the stator and rotor; wherein each of the stator permanent magnet poles is a magnetic structure that is ferromagnetically isolated from adjacent permanent magnet poles.