Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-06-05
2007-06-05
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S700000, C318S801000, C187S296000
Reexamination Certificate
active
11181544
ABSTRACT:
A motor control for a reciprocating load includes overvoltage suppression. The motor control comprises a variable frequency drive (VFD) operatively connected to a power source for operating a motor to drive the reciprocating load. A sensor determines motor torque. A control unit is connected to the VFD and to the sensor and is adapted to control the VFD in a normal mode to operate the motor at a select reference frequency. The control unit predicts occurrence of a negative motor torque condition based on sensed motor torque and in response to a negative motor torque condition controls the VFD in a negative motor torque mode to operate the motor at a higher frequency than the select reference frequency to prevent the motor from entering a negative slip condition.
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Geoffrey Brian
Rucinski Mike
Swamy Mahesh M.
Yukihira Yoshiaki
Ip Paul
Wood Phillips Katz Clark & Mortimer
Yaskawa Electric America, Inc.
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