Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1991-08-16
1992-10-27
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02K 2900
Patent
active
051592460
ABSTRACT:
A sensorless type, brushless direct-current motor which is equipped with a rotor having a plurality of magnetic poles and multi-phase coils which are wound around a magnetic core to form magnetic paths and whose first terminals are connected in common to each other, the rotor being rotationally driven by selectively supplying bidirectional currents to the other terminals of said multi-phase coils. The motor is provided with an energization circuit which successively performs energizations of the multi-phase coils with predetermined patterns for all combinations of two of the multi-phase coils when the rotor is in a stopping state. A voltage-measuring circuit measures a voltage developed at the commonly connected first terminals of the multi-phase coils at every energization pattern in correspondence with a variation of an inductance generated in the coils due to the magnetic flux passing through the magnetic core. A position detecting unit detects a relative position of the rotor with respect to the multi-phase coils on the basis of the voltage measured by the voltage-measuring circuit so that the rotation of the motor is started on the basis of the detected relative position.
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Ro Bentsu
Victor Company of Japan Ltd.
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