Rotation angle detection apparatus enabling measurement of...

Details Rotation angle detection apparatus enabling measurement of... Rotation angle detection apparatus enabling measurement of...

2007-05-03

2008-09-02

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

07420363

ABSTRACT:
A rotation angle of a shaft is detected based on changes in levels of magnetic flux from a single magnet that is mounted on the shaft and is moved axially in accordance with rotation of the shaft. Respective detected variations in level of X-direction and Y-direction magnetic flux components (each at right angles to the shaft axis) are used to obtain a first quantity that varies monotonically, and a second quantity that varies periodically, in accordance with increased rotation angle. An accurate value of the shaft rotation angle is calculated based on the first and second quantities, in combination.

REFERENCES:
patent: 6630823 (2003-10-01), Tateishi et al.
patent: 6894487 (2005-05-01), Kunz-Vizenetz
patent: 2005/0028614 (2005-02-01), Saito
patent: 2002-213910 (2002-07-01), None
patent: 2004-53444 (2004-02-01), None
patent: 2005-55297 (2005-03-01), None

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