Encoder signal analysis system for high-resolution position...

Details Encoder signal analysis system for high-resolution position... Encoder signal analysis system for high-resolution position...

2011-01-04

2011-01-04

Kundu, Sujoy K (Department: 2863)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Position measurement

C702S067000, C702S073000, C702S085000, C702S104000, C702S106000, C702S150000, C702S151000, C318S127000, C318S128000, C318S490000, C318S560000, C318S652000

Reexamination Certificate

active

07865324

ABSTRACT:
An apparatus and method for identifying the position of a magnetic shaft are provided. N field sensors are adjacently positioned at fixed locations relative to the shaft's periodic field, corresponding to 180/N relative phase shifts. A table provides N>2 predetermined signal models and a pre-identified position associated with each. An interpolator compares a representation of the N measured sensor signals to at least two predetermined models to generate a correction signal that provides another pre-identified position. The correction signal depends on N sensors for every position of the shaft. The correction signal is used to incrementally choose said another pre-identified position from the table as an approximate position of the shaft in an iterative process to find the minimum correction signal and identify the position.

REFERENCES:
patent: 5933106 (1999-08-01), He et al.
patent: 2002/0019714 (2002-02-01), Carliale et al.

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