Measuring and testing – Speed – velocity – or acceleration – Magnetic speed measuring or mechanical speed measuring with...
Patent
1995-12-22
1998-04-28
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Magnetic speed measuring or mechanical speed measuring with...
7351901, 7352001, 324174, 32420715, 32420725, 310168, 310171, 384448, G01P 322, G01P 348, F16C 3200, G01B 714
Patent
active
057447209
ABSTRACT:
The sensor 20a has first and second permanent magnets 31, 32, stator 33 and coil 24. The first and second permanent magnets 31, 32 has an inner peripheral face formed with south and north poles circumferentially and alternately with a uniform space therebetween. Holes 17a, 17b are formed circumferentially with a uniform space therebetween in the tone wheel 13. At the moment when all the south poles in the first permanent magnet 31 are opposed to the holes 17a, all the north poles of the second permanent magnets 32 are opposed to the holes 17b, resulting in that the alternating magnetic flux flows in the stator 33 and the electric voltage is generated alternately in opposite directions in the coil 24 as the tone wheel 13 rotates.
REFERENCES:
patent: 5018384 (1991-05-01), Hayashi et al.
patent: 5023547 (1991-06-01), Pawlak et al.
patent: 5293124 (1994-03-01), Caillaut et al.
patent: 5309094 (1994-05-01), Rigaux et al.
patent: 5332964 (1994-07-01), Ouchi
patent: 5434503 (1995-07-01), Rigaux et al.
patent: 5523680 (1996-06-01), Sumi
Moller Richard A.
NSK Ltd.
Williams Hezron E.
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