EDDY CURRENT SPEED REDUCER

WIPO Patent Application WO/2003/073592

A1

It is an object of the invention to provide an eddy current speed reducer that, though simple in construction, is superior in brake efficiency. Another object is to provide an eddy current speed reducer that has a small switching stoke and is capable of rapid switching. Thus, an eddy current speed reduce according to the invention comprises a brake disk (2) connected to a rotary shaft (1); a plurality of permanent magnets (7) having a magnetic pole surface opposed to the brake disk (2); and a drive mechanism for moving the permanent magnets (7) toward and away from the brake disk (2). Preferably, it further comprises a guide sleeve (3) supported by a nonrotatable structural section not connected to the rotary shaft (1), receiving a holder ring (4) supporting the permanent magnets (7) and opposed to the brake disk (2). And in the guide sleeve (3), a ferromagnetic member (8) is positioned in opposed relationship to the brake disk (2). Alternatively, the whole including the permanent magnets (7) of the guide sleeve (3) and the opposed end surface is constructed of nonmagnetic material.

IMANISHI KENJI (JP)
NOGUCHI YASUTAKA (JP)
HIRAMATSU SHINICHIRO (JP)
TANI YASUNORI (JP)
YAMAGUCHI HIROYUKI (JP)
TASAKA MASAHITO (JP)
SAITO AKIRA (JP)
MIYAHARA MITSUO (JP)

PCT/JP2003/000996

September 04, 2003

January 31, 2003

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SUMITOMO METAL IND (JP)
IMANISHI KENJI (JP)
NOGUCHI YASUTAKA (JP)
HIRAMATSU SHINICHIRO (JP)
TANI YASUNORI (JP)
YAMAGUCHI HIROYUKI (JP)
TASAKA MASAHITO (JP)
SAITO AKIRA (JP)
MIYAHARA MITSUO (JP)

H02K49/04; (IPC1-7): H02K49/02; H02K49/10

JP2000358353A	2000-12-26
JP2001028876A	2001-01-30
JPH0678519A	1994-03-18
JP2002291224A	2002-10-04

See also references of EP 1480320A4

Iizuka, Yuji (1335-35 Kuzubukur, Higashimatsuyama-shi Saitama, JP)

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