Rotor with reduced windage losses

Details Rotor with reduced windage losses Rotor with reduced windage losses

1989-09-01

1991-03-19

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 86, 310269, H02K 2120, H02K 5128

Patent

active

050013785

ABSTRACT:
A homopolar, transverse pole rotor (14) having a central cylindrical body (24) with a set of circumferentially spaced, axially extending salient poles (28) at each end thereof, is constructed to reduce windage losses. Integral shrouds (29, 31) are placed on either side of each set of salient poles, and a relief is machined into the outer surface of each shroud to form an accentuated pole tip (64) which ensures magnetic centering of the rotor. To further minimize windage losses, the diameter of the central cylindrical body (24) can be reduced, and non-magnetic material can be secured within interpole recesses. Mechanical fasteners (66), dove tails (72) or tensioned circumferential banding (82) can be used to secure the non-magnetic interpole pieces to the rotor.

REFERENCES:
patent: 3157806 (1964-11-01), Wiedemann
patent: 3321652 (1967-05-01), Opel
patent: 3737696 (1973-06-01), Richter et al.
patent: 4024628 (1977-05-01), Crites
patent: 4302693 (1981-11-01), Burgmeier et al.
patent: 4423344 (1983-12-01), Jones
patent: 4445056 (1984-04-01), Gaylord
patent: 4617485 (1986-10-01), Nakamura et al.
patent: 4786834 (1988-11-01), Grant
patent: 4795936 (1989-01-01), Crosetto et al.
James Vrancik, "Prediction of Windage Power Loss in Alternators", Lewis Research Center, NASA, Jul. 26, 1968.

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