Universal commutator for A.C. motors
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United States of America Patent
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-
Nov 17, 1998
Grant Date -
N/A
app pub date -
Nov 10, 1997
filing date -
Nov 10, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A commutator for A.C. shaded pole motors that permits the use of a D.C. source to provide a suitable alternating current that can be adjusted to regulate the rotational speed and compensate for the slip factor. The commutator includes a wave forming circuit that generates two triggering signals with rising and falling time that do not coincide in time. These triggering signals are transmitted to the gates of respective power switching devices to alternatively make a connection to ground of the ends of the motor winding. The motor winding includes a central tap to which a D.C. voltage is applied and the two halves are wound to induce opposite magnetic fields. The magnetic fields will thus avoid fighting or contention.
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