Use of unidirectional FET switches for motor electrical disengagement
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United States of America Patent
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Issued Date -
Nov 18, 2004
app pub date -
May 13, 2003
filing date -
May 13, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a system for disengaging a motor and preventing dynamic braking current loops. The system includes a power circuit, a gate driver circuit, and unidirectional switches attached to each motor winding. Unidirectional switches such as field effect transistors (FETs) can provide current blocking in only one direction when not conducting. Unidirectional blocking according to the present invention is sufficient for preventing the undesirable dynamic braking current loops. The approach of this invention requires N unidirectional switches, where N is the number of motor windings. Thus, on a 3 phase motor, three unidirectional switches are used, each being in series with one on the motor windings.
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