Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1977-08-17
1978-10-31
Halvosa, George E. A.
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
188165, 192 84PM, 335288, 335306, B60L 728
Patent
active
041229223
ABSTRACT:
An eddy current or hysteresis brake, preferably for track bound vehicles which is infinitely variable and wear-free. A cylindrical rotatable permanent magnet magnetized on its diameter is arranged between a pair of pole pieces in combination with the plurality of stationary magnets, each arranged to magnetize the pole pieces with opposite magnetic polarity. By rotating the cylindrical magnet, the magnetic field at the ends of the pole pieces can be varied from a maximum to zero. The generated flux is projected into the track. Braking occurs by induced eddy currents.
REFERENCES:
patent: 2243616 (1941-05-01), Bing et al.
patent: 2287286 (1942-06-01), Bing et al.
patent: 2404710 (1946-07-01), Hitchcock
patent: 2622707 (1952-12-01), Faus
patent: 3591428 (1971-07-01), Buschow et al.
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