Method and apparatus for determining motor velocity using...

Details Method and apparatus for determining motor velocity using... Method and apparatus for determining motor velocity using...

2007-02-27

2007-02-27

Swarthout, Brent A. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C318S068000, C318S268000

Reexamination Certificate

active

10965527

ABSTRACT:
A method for determining motor velocity includes generating an edge signal including a plurality of edges. The edge signal indicates rotational travel of a motor. Edge counts in the edge signal occurring during periodic sample intervals are determined. The edge counts are filtered over a predetermined number of samples. A velocity feedback signal is generated for the motor based on the filtered edge counts. A drive unit for controlling a motor includes an edge detection unit, a position accumulator, and a velocity filter. The edge detection unit is operable to receive a motor position signal and generate an edge signal including a plurality of edges. The edge signal indicates rotational travel of the motor. A position accumulator is operable to determine edge counts in the edge signal occurring during periodic sample intervals. The velocity filter is operable to filter the edge counts over a predetermined number of samples to generate a velocity feedback signal for the motor based on the filtered edge counts.

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