Torque direction detecting device for brushless motor

Details Torque direction detecting device for brushless motor Torque direction detecting device for brushless motor

2007-04-03

2007-04-03

Noori, Max (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

11049215

ABSTRACT:
A torque direction detecting device for an electric motor includes a resolver which provides a pair of a sin θ signal and a cos θ signal with θ changing from 0 degree to 360 degrees in electric angle according to rotation of the brushless motor, a circuit which calculates an electric angle of the brushless motor from the sin θ signal and the cos θ signal, a current sensor for detecting phase current flowing through the phase windings, a circuit which provides a signal if the phase currents is in a prescribed magnitude relation, a circuit which divides a period of the 360 degree-electric angle into 8 timing sections according to magnitude relation between the sin θ signal and the cos θ signal and comparison of the sin θ signal and the cos θ signal with 0, and a circuit which determines a torque direction of the brushless motor if the comparison signal is provided in one of prescribed two timing sections each of which has a specific combination of the magnitude relation and the comparison of the sin θ signal and the cos θ signal.

REFERENCES:
patent: 4762007 (1988-08-01), Gasperi et al.
patent: 4843291 (1989-06-01), Predina
patent: 5006768 (1991-04-01), Rozman
patent: 2003/0151383 (2003-08-01), Hayashi
patent: A-2003-235285 (2003-08-01), None
Chinese Office Action for corresponding Japanese Application No. 200510006280.8 dated May 26, 2006.
English translation of Chinese Office Action dated Oct. 20, 2006 issued in the corresponding Chinese application 200510006280.8.

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