Turning device position sensing system and method

Details Turning device position sensing system and method Turning device position sensing system and method

2007-04-10

2011-11-15

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C310S06800R

Reexamination Certificate

active

08058868

ABSTRACT:
A system for determining an absolute position of a motor. The system includes first and second multi-polar magnetic rings, first and second processing units, and at least one external sensor. The first multi-polar magnetic ring is concentrically positioned around the motor, and has a plurality of pole pairs. The second multi-polar magnetic ring is concentrically positioned around the first multi-polar magnetic ring, and has at least one pole pair. The first processing unit is positioned near the first multi-polar magnetic ring to determine an angular position over one of the pole pairs of the first multi-polar magnetic ring. The sensor is positioned external to the processing unit and over the second multi-polar magnetic ring to indicate a state of the pole pair of the second multi-polar magnetic ring. The second processing unit generates an absolute position of the motor based on the angular position and the state.

REFERENCES:
patent: 6577121 (2003-06-01), Adelerhof et al.
patent: 6841958 (2005-01-01), Desbiolles et al.
patent: 2004/0070391 (2004-04-01), Muszynski
patent: 2006/0059698 (2006-03-01), Staudt
patent: 202004014849 (2005-02-01), None
patent: 1408307 (2004-04-01), None
International Search Report and Written Opinion for PCT/US2007/066347, dated Oct. 15, 2007, 9 pages.

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