Eddy-current brake with magnets shaped to contain magnetic field

Details Eddy-current brake with magnets shaped to contain magnetic field Eddy-current brake with magnets shaped to contain magnetic field

1993-05-24

1994-08-16

Oberleitner, Robert J.

Brakes

Operators

Electric

188161, 192 84PM, 310105, 310114, B60L 728, H02K 4904

Patent

active

053378628

ABSTRACT:
An eddy current retarder for an automotive vehicle braking system including an annular fixed frame defining a hollow chamber is disposed internally of a brake drum, a pair of transversely adjacent parallel support rings disposed in the chamber of the fixed frame, one of the support rings being fixed to the frame and the other being rotatable to permit relative angular movement therebetween. Each support ring supports a plurality of permanent magnets circumferentially spaced apart at a given pitch and having outwardly facing alternating polarities. Ferromagnetic plates circumferentially spaced apart at the given pitch are embedded in an outer wall of the fixed frame between the magnets and the brake drum. The ferromagnetic plates have central portions thicker than transversely projecting end portions.

REFERENCES:
patent: 3488535 (1970-01-01), Baermann
patent: 4974706 (1990-12-01), Maji et al.
patent: 5023499 (1991-06-01), Kuwahara
patent: 5054587 (1991-10-01), Matsui et al.
patent: 5064029 (1991-11-01), Araki et al.
patent: 5145038 (1992-09-01), Kuwahara

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