Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-03-28
2006-03-28
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S648000, C340S686100, C340S686300, C073S462000, C324S207160
Reexamination Certificate
active
07019661
ABSTRACT:
An axial position detection circuit detects the axial position of a rotor from the difference in voltages generated at axial position detection coils disposed at both ends in the axial direction of a stator of a canned motor. An axial zero point adjustment circuit uses a voltage supply, which varies proportionately with the power supply voltage of the canned motor, as a bias power supply to adjust the voltage difference of the axial position detection coils to zero when the rotor is at a reference position in the axial direction. Even if the power supply voltage of the canned motor varies, since the bias power supply of the axial zero point adjustment circuit varies in likewise manner, the zero point adjustment by the axial zero point adjustment circuit is not affected and axial bearing wear detection of high precision is enabled.
REFERENCES:
patent: 6114966 (2000-09-01), Eguchi
patent: 6429781 (2002-08-01), Abe et al.
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patent: 08-93681 (1996-04-01), None
patent: 09-233769 (1997-09-01), None
patent: 10-080103 (1998-03-01), None
patent: 11-148819 (1999-06-01), None
patent: 2002-197312 (2000-07-01), None
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Patent Abstracts of Japan for JP2000-197312 published on Jul. 14, 2000.
Patent Abstracts of Japan for JP11-148819 published on Jun. 2, 1999.
Patent Abstracts of Japan for JP08-093681 published on Apr. 9, 1996.
Patent Abstracts of Japan for JP2001-231217 published on Aug. 24, 2001.
Patent Abstracts of Japan for JP09-233769 published on Sep. 5, 1997.
Patent Abstracts of Japan for JP10-080103 published on Mar. 24, 1998.
Darby & Darby
Hofsass Jeffery
Kabushiki Kaisha Teikoku Denki Seisakusyo
Lau Hoi C.
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