Method for correcting the determination of the rotating...

Details Method for correcting the determination of the rotating... Method for correcting the determination of the rotating...

2005-01-18

2005-01-18

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Speed

C318S565000, C318S286000, C702S151000

Reexamination Certificate

active

06845337

ABSTRACT:
A method for determining the rotational position of a motor drive shaft includes counting detected ripples contained in a motor current signal as the shaft is driven. Whether a ripple expected to be contained in the current signal at a probable time is absent from within a tolerance band containing the probable time of the expected current ripple is determined. If the expected ripple is absent from within the tolerance band containing the probable time, then whether a ripple is detected after the tolerance band of the expected ripple is determined. If a ripple is detected after the tolerance band and the expected ripple is absent from within the tolerance band, then the expected ripple is counted as a detected ripple. The determined rotational position of the shaft is based on the counted ripples. The length of the tolerance band dynamically changes as a function of a motor operating state.

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