Circuit for and method of controlling 4-phase brushless DC motors
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United States of America Patent
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Aug 27, 1991
Grant Date -
N/A
app pub date -
Apr 13, 1989
filing date -
May 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control circuit bipolarly controls the stator of a 4-phase brushless DC motor in which the staor windings are connected in a ring circuit with only four semiconductor switches. Also, two control sequences are possible: a first control sequence consisting of four switching events per revolution and number of pole pairs, in which only two semiconductor switches are activated at a time, and a second control sequence consisting of eight switching events per revolution and number of pole pairs, in which alternately two and three semiconductor switches are activated simultaneously.
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