Magnetic hysteresis clutch

Details Magnetic hysteresis clutch Magnetic hysteresis clutch

1994-08-25

1996-12-03

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 78, 310 92, H02K 4904, H02K 1500

Patent

active

055811396

ABSTRACT:
A magnetic hysteresis clutch comprises an external rotor and a rotary magnetic inductor arranged in said external rotor so as to define a radial air gap. Rings of ferromagnetic hysteresis material are mounted in said external rotor so as to be able to undergo a reversible thermal expansion of their internal diameter leading to an increase in the radial air gap. The clutch is designed so that the heating up of the ferromagnetic material in the rings which accompanies an increase of the slip between the external rotor and the rotary magnetic inductor, produces a reversible increase in the radial air gap which is sufficient to decrease the transmitted torque. Thus it is possible to provide a magnetic hysteresis clutch in which the transmitted torque reversibly decreases when the slip increases.

REFERENCES:
patent: 2683825 (1954-07-01), Georgeff
patent: 3700941 (1972-10-01), Duncan
patent: 3848852 (1974-11-01), Therkildsen
patent: 3915433 (1975-10-01), Therkildsen
patent: 4227680 (1980-10-01), Hrescak
patent: 4777397 (1988-10-01), Parshall
patent: 4876471 (1989-10-01), Lacour
patent: 4998052 (1991-03-01), Erdman et al.
patent: 5204572 (1993-04-01), Ferreira

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