Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Reexamination Certificate
2007-12-11
2007-12-11
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
C324S207250, C384S448000
Reexamination Certificate
active
11709257
ABSTRACT:
To provide a bearing with integrated rotation sensor capable of detecting the rotational speed and the origin position without being affected by an external magnetic field, the bearing includes a rotating ring, a magnetic encoder7mounted on the rotating ring, and a stationary ring. The magnetic encoder7includes a ring shaped rotational speed to-be-detected member7A having a plurality of magnetic poles alternating with each other, and a origin position to-be-detected element7Ba arranged axially in a portion of the circumferential direction of the to-be-detected member7A. Rotational speed and origin position magnetic sensors are mounted on the stationary ring so as to respectively confront the rotational speed and origin position to-be-detected elements. A magnetized restoration element7Bb is disposed in a circumferential portion of the magnetic encoder7, where it confronts the origin position magnetic sensor, and except the second to-be-detected member7Ba.
REFERENCES:
patent: 6011388 (2000-01-01), Miyazaki et al.
patent: 6127819 (2000-10-01), Ouchi
patent: 6882142 (2005-04-01), Koike et al.
patent: 2004-101312 (2004-04-01), None
LeDynh Bot
NTN Corporation
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