Electronic Commutator Circuits
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United States of America Patent
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Issued Date -
May 7, 2009
app pub date -
Sep 4, 2006
filing date -
Oct 18, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The electronic commutator circuits provide forced commutation enhancements that can be embedded within a known electronic commutator to overcome its low speed torque limitation. The forced commutation enhancements to the basic switched stage use a pair of thyristors. Capacitors may be pre-charged and synchronized to supplement coil voltages when discharged, thereby reducing commutation overlap duration and maximizing the turn-off time available to allow the thyristors to attain forward blocking capability. A capacitive discharge can be achieved by initiating the capacitive discharge by the same thyristor that will carry the current following the commutation, or by initiating the capacitive discharge by an auxiliary thyristor.
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