Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1991-06-18
1993-01-05
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318431, H02P 602
Patent
active
051774160
ABSTRACT:
A brushless DC motor which does not have a position sensor for detecting a rotational position of the rotor, is arranged so that conducting phases of the stator windings to be detected are subsequently selected by multi-phase selection signals in response to a conducting state of the stator windings; then, a pulse signal train is generated by detecting the counter electromotive forces induced in the conducting phases subsequently selected and a trapezoidal waveform signal is formed by a slant waveform signal generated in response to the pulse signal train thus obtained. Furthermore, with the trapezoidal waveforms signal thus formed as position signal of the rotor, an electric current signal having a trapezoidal waveform is supplied; to the stator windings, resulting in smooth commutation of the conducting phase of the stator windings. When the motor is to be started, phase commutation of the stator windings is carried out forcibly by means of a pseudo output pulse, thus providing a starting characteristic compatible with that obtained in conventional motors having a rotor position sensor.
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Gotou Makoto
Inaji Toshio
Matsushita Electric - Industrial Co., Ltd.
Ro Bentsu
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