Sang Min Oh

US Patent:

49393995, Jul 3, 1990

Filed:

Sep 7, 1988

Appl. No.:

7/241911

Inventors:

Sang S. Oh - Villanova PA
Jang K. Oh - Villanova PA

International Classification:

H02K 300

US Classification:

310198

Abstract:

Radial loop coils are wound in radial planes partly in the conventional slots of the stator and/or rotor core at right angles to the planes of the conventional drum coils. No conventional drum coils are wound. A cylindrical body of nonmagnetic material is fixedly interposed between the rotor core and the shaft and/or between the stator core and the yoke so that the flux of the stator and the rotor core flows in opposite side portions of the stator and rotor core, not through the shaft or the yoke, to generate e. m. f. in the radial loop coils by the transformer action. The flux which is produced by the transformer m. m. f. of the radial loop coils is constrained to flow into the air gap by virtue of the presence of the cylindrical body of nonmagnetic material where it acts to eliminate changes in the main magnetic field flux density distribution in the air gap. The radial loop coils are connected in series at the surface of the stator and/or rotor cores to constitute drum coils and are also connected to the radial loop coils at 180. degree. electrical degrees therefrom.