Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1999-02-16
2000-08-29
Masih, Karen
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 318599, 318293, 318811, H02K 2300
Patent
active
061113727
ABSTRACT:
A sensorless motor driver receives the back electromotive forces appearing in the individual coils provided one for each phase in a brushless motor and the voltage at the node common to all of those coils, and produces square-wave signals including noise. These signals are then subjected to masking by a masking circuit in accordance with a noise masking signal produced by a masking signal producing circuit. In accordance with the thus masked signals, a driving current is supplied to the brushless motor. The driving current varies according to the load on the motor. The masking signal producing circuit monitors the driving current supplied to the motor, and outputs the masking signal in such a way that the length of the masking periods varies according to the driving current.
REFERENCES:
patent: 5317243 (1994-05-01), Cameron
patent: 5517095 (1996-05-01), Carobolante et al.
patent: 5869944 (1999-02-01), Tanina
Masih Karen
Rohm & Co., Ltd.
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