Magnetic speed sensor-equipped bearing assembly and motor...

Details Magnetic speed sensor-equipped bearing assembly and motor... Magnetic speed sensor-equipped bearing assembly and motor...

2005-04-19

2005-04-19

Le, N. (Department: 2862)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C324S207120, C324S207200, C384S448000

Reexamination Certificate

active

06882142

ABSTRACT:
To minimize change in duty ratio of an output signal brought about by a leakage flux and to obtain a sensor output stabilized even under an environment of use abundant of the leakage fluxes, a sensor-equipped bearing assembly31includes a rotatable race member32provided with a to-be-detected portion1having a magnetic characteristic in which N and S magnetic poles alternate with each other. In face-to-face relation with this to-be-detected portion1,a magnetic detecting portion2is secured to a stationary race member33.The magnetic detecting portion2is made up of magnetic sensors arranged in a direction circumferentially of the race members32, 33and each capable of providing an analog output. A differential output generating means7is provided for processing a differential output of the adjoining two magnetic sensors2aand2bas an encoder signal for one phase.

REFERENCES:
patent: 4369405 (1983-01-01), Sato et al.
patent: 5084674 (1992-01-01), Lachmann et al.
patent: 5302893 (1994-04-01), Yoshimura
patent: 5900727 (1999-05-01), Griffen et al.
patent: 2176616 (1988-12-01), None
Patent Abstract of Japan 2002-174258 Jun. 21, 2002.

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