Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1994-06-17
1995-12-05
Martin, David S.
Electricity: motive power systems
Switched reluctance motor commutation control
388815, 388910, 3889281, H02P 506
Patent
active
054737257
ABSTRACT:
The speed of a brushless DC motor driving an electric vehicle is controlled with a speed feedback signal proportional to rotation speed of the motor by processing the back electromotive force (EMF) waves of the brushless DC motor. In this method, the back EMF waves of plural phases are taken to pass the differential amplifiers for each phase, and the back EMF signals in the rising and falling regions of the back EMF waves of each phase are obtained to synthesize, by the commutation signals of a magnetic pole sensor passing the phase detecting circuit, after full-wave rectification and low-pass filtering, a [speed feedback signal. This method differs from normal speed control of a motor, in which a speed feed-back element such as a DC tachometer or an encoder is necessary for controlling the speed. This invention permits the brushless DC motor to control the speed without a feedback element such as a DC tachometer or an encoder, thereby decreasing the cost of the brushless DC motor speed control system.] positive analog voltage is obtained and then maintained or converted to a positive or negative analog voltage by detecting the rotating direction of the motor by the commutation signals, as a speed feedback signal.
REFERENCES:
patent: 4528485 (1985-07-01), Boyd, Jr.
patent: 4528486 (1985-07-01), Flaig et al.
patent: 4743815 (1988-05-01), Gee et al.
patent: 4857814 (1989-08-01), Duncan
patent: 5023527 (1991-06-01), Erdman et al.
patent: 5187419 (1993-02-01), DeLange
Chang Hong-Shi
Chen Tshaw-Chuang
Shieh Yaw-Shih
Yang Huan-Jen
Industrial Technology Research Institute
Liauh W. Wayne
Martin David S.
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