Electric motor having a low loss magnetic flux return path

Details Electric motor having a low loss magnetic flux return path Electric motor having a low loss magnetic flux return path

1992-03-30

1993-09-07

Picard, Leo P.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310254, 310259, H02K 112, H02K 1500

Patent

active

052432483

ABSTRACT:
The invention is directed to an electric motor construction having a magnetic flux return path which exhibits very low losses due to eddy currents or hysteresis, and simplifies construction thereof. In the motor construction, the magnetic flux return path is constructed from discrete magnetic material wire which is wrapped or otherwise formed in the desired return path configuration. The magnetic material wire is wound in a direction which generally crosses the flow of magnetic flux and yet is substantially tolerant of cross-winding fields. In this way, the flux return path provides easy construction in that coil winding techniques may be used, and the winding direction is less critical as it can cross the flow of flux therein. The flux return path greatly reduces eddy current losses as the cross section of the path to eddy current flow is the cross section of discrete wires, and because the discrete wires are formed with high packing fraction which will minimize skin effects especially at high frequencies.

REFERENCES:
patent: 847088 (1907-03-01), Kitsee
patent: 2277474 (1942-03-01), Bergtold
patent: 3956651 (1976-05-01), Brammerlo
patent: 3983433 (1976-09-01), Sims
patent: 3983435 (1976-09-01), Sims

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