Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-01-16
2007-01-16
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S800000, C318S801000, C318S803000, C318S727000, C363S037000, C363S044000
Reexamination Certificate
active
11068323
ABSTRACT:
Methods and apparatus for reducing the common mode voltage generated by eliminating zero-voltage vectors in a rectifier/inverter variable frequency drive (VFD) system includes comparing three phase voltages to each other to determine a maximum voltage in one phase, a minimum voltage in another phase and a middle voltage in still another phase, inverting phase voltages for one phase having the maximum voltage and another phase having the minimum voltage, comparing the phase voltages to a carrier wave to determine gating signals for three respective phases of the inverter, and inverting gating signals for the one phase having the maximum voltage and for another phase having the minimum voltage to reduce the common mode voltage in the motor. In one embodiment, the zero-voltage vectors are removed by relating a first plurality of gating signals and a plurality of sector logic signals in a logic table to a second plurality of gating signals that are applied to phases of the inverter
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Kerkman Russel J.
Lu Haihui
Yin Qiang
Ip Paul
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
Walbrun William R.
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