Rotational speed sensing device provided with a pair of magnetic

Details Rotational speed sensing device provided with a pair of magnetic Rotational speed sensing device provided with a pair of magnetic

1996-03-29

1999-05-18

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420722, 32420715, 384448, G01P3/44;3/488

Patent

active

059053755

ABSTRACT:
A rotational speed sensing device for sensing a rotational speed of a rotating member includes a pulsar ring having a plurality of wall portions, a permanent magnet, a coil, a first magnetic member and a second magnetic member. The first magnetic member is provided for forming a first magnetic circuit which includes at least the inner side of the coil. The first magnetic member has a plurality of projections that are alternately positionable during rotation of the pulsar ring in a first position in which the projections oppose the wall portions and in a second position in which the projections do not oppose the wall portions while the pulsar ring is rotating. The second magnetic member is provided for forming a second magnetic circuit which does not include the inner side of the coil in such a manner that the magnetic resistance of the second magnetic circuit is lower than the magnetic resistance of the first magnetic circuit when the projections are located in the second position.

REFERENCES:
patent: 3541368 (1970-11-01), Jones et al.
patent: 5293124 (1994-03-01), Caillaut et al.
patent: 5381090 (1995-01-01), Adler et al.

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