Determining rotation of a freewheeling motor

Details Determining rotation of a freewheeling motor Determining rotation of a freewheeling motor

2007-07-10

2007-07-10

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

C324S207250, C318S434000

Reexamination Certificate

active

10637985

ABSTRACT:
A device and method that determine a freewheeling rotation of an electric motor. The method includes steps of measuring first and second signals from respective first and second windings of an unenergized motor, and determining from the first and second signals whether the unenergized motor is rotating. The method may also include determining from the first and second signals the direction of rotation if the unenergized motor is rotating. The method may further include measuring a third signal from a third winding of the unenergized motor, and determining whether the motor is rotating may include determining that the motor is not rotating if the first, second, and third signals are equal. The first and second signals may each include a respective back voltage.

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U.S. Appl. No. 10/608,273, Shao.

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