Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-06-12
2007-06-12
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S254100, C318S432000, C318S434000, C318S722000, C318S727000, C318S801000, C318S811000, C318S812000
Reexamination Certificate
active
10835966
ABSTRACT:
A DC offset compensation system and method significantly reduce a DC offset voltage in the voltage feedback loop of an AC motor drive control system. A control voltage error signal is demodulated and filtered and applied to the closed loop voltage feedback signals to compensate for DC offset voltages in the closed loop voltage feedback. A frequency discriminator tuned to the fundamental motor frequency improves the precision of the DC offset detection. A startup flux DC offset compensation operates to eliminate initial startup flux DC offset. Motor flux compensation is improved through a variable flux filter time constant.
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Donovan Lincoln
Glass Erick
International Rectifier Corporation
Osterlenk, Faber, Gerb & Soffen, LLP
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