Control circuit for an electric motor without a collector
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United States of America Patent
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Mar 16, 1993
Grant Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Nov 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is concerned with a control circuit for an electric motor without a collector, of the type comprising a rotor magnetized in such a manner as to display at least one pair of magnetic poles, and a stator provided with a two- or a polyphase winding comprising several elementary coils of the same impedance, this circuit comprising electronic commutation means arranged for connecting selectively the elementary coils according to a cycle of successive supply states, to the terminals of a current source, under the effect of a commutation control signal, means for detecting the voltages appearing at the terminals of elementary coils or of groups of elementary coils and means for generating from the detected voltages, the commutation control signal.
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