Brushless motor drive device

Electricity: motive power systems – Switched reluctance motor commutation control

Reexamination Certificate

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Details

C318S132000, C318S434000, C318S721000

Reexamination Certificate

active

11307104

ABSTRACT:
A brushless motor drive device has a signal synthesizing circuit for converting a plurality of sensing signals into a plurality of drive signals so as to determine an amplitude of each of the drive signals in accordance with a current error signal. The sensing signals are generated by a sensing circuit in response to variations in a magnetic field of a brushless multi-phase motor. The current error signal is representative of a difference between a current command signal and a motor drive current. The signal synthesizing circuit is characterized by including a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. The calibrating circuit includes a differential amplifying circuit, a rectifying circuit, a filtering circuit, and a dividing circuit.

REFERENCES:
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patent: 5811949 (1998-09-01), Garces
patent: 6674258 (2004-01-01), Sakai et al.
patent: 6710568 (2004-03-01), Fujii
patent: 6710572 (2004-03-01), Okubo
patent: 6759827 (2004-07-01), Kawashima
patent: 6924611 (2005-08-01), Tzeng et al.
patent: 6933690 (2005-08-01), Yamamoto
patent: 7015663 (2006-03-01), Tzeng et al.
patent: 2006/0049785 (2006-03-01), Tzeng et al.

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