Electricity: motive power systems – Induction motor systems – Power-factor control
Reexamination Certificate
2006-05-02
2006-05-02
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Power-factor control
C318S727000, C318S800000, C702S038000, C702S060000
Reexamination Certificate
active
07038423
ABSTRACT:
A method and an apparatus for controlling ride through of an induction motor by detecting a power loss from a power supply connected to the induction motor, disconnecting the induction motor from the power supply, monitoring a line voltage of the power supply, monitoring a back emf voltage generated by the induction motor and monitoring a phase differential between the line voltage and the back emf voltage. It is determined whether the monitored voltages are within a predetermined voltage limit and the phase differential is within a predetermined phase limit and the power supply is re-connected to the induction motor in response to the monitored voltages being within the predetermined voltage limit and the monitored phase differential being within the predetermined phase limit.
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Reed Thomas A.
Wittenmyer Douglas A.
Bay Controls, Inc.
Fraser Martin Buchanan Miller LLC
Ip Paul
Miller James D.
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