Method of increasing operating efficiency of electric machines

Details Method of increasing operating efficiency of electric machines Method of increasing operating efficiency of electric machines

1987-10-05

1988-06-14

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

29598, 219121LH, 310 42, 310261, H02K 1716, B23K 2600

Patent

active

047514175

ABSTRACT:
In order to improve the efficiency of electric machines, by reducing losses caused by eddy currents induced by high frequency fluxes, the outer surface of the rotor, including the rotor pole face, has a plurality of circumferential grooves. The grooves are provided in axially spaced relation along the rotor. Preferably, the method of reducing losses includes the step of forming the grooves by laser cutting, which permits the width and spacing of the grooves to be minimized so as to maximize loss reduction by increasing resistance to eddy currents.

REFERENCES:
patent: 3530573 (1970-09-01), Helgeland
patent: 4170726 (1979-10-01), Okuda
patent: 4229640 (1980-10-01), Castellani-Longo
patent: 4317023 (1982-02-01), Gryskiewicz
patent: 4329564 (1982-05-01), Hazelton et al.
patent: 4339655 (1982-07-01), Lauroesch
patent: 4356376 (1982-10-01), Komanduri et al.
patent: 4566936 (1986-01-01), Bowlin
patent: 4628179 (1986-12-01), Crahay
patent: 4644210 (1987-02-01), Meisner et al.

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