Electricity: motive power systems – Synchronous motor systems
Reexamination Certificate
2005-11-15
2005-11-15
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
C318S701000, C318S801000, C318S802000
Reexamination Certificate
active
06965212
ABSTRACT:
A method and apparatus control a power converter (20) of an AC motor drive system (10). The method and apparatus: generate a field current regulating signal to control a field current component flowing from the power converter (20) to the AC motor (30), thereby achieving field current regulation; generate a torque current regulating signal to control a torque current component flowing from the power converter (20) to the AC motor (30), thereby achieving torque current regulation, the torque current regulation having lower priority than the field current regulation; and execute a close-loop field weakening control scheme, which generates a field weakening control command as a function of the difference between a torque current regulation voltage demand and voltage available for torque current regulation. The field current regulating signal is adjusted in accordance with the field weakening control signal to selectively reduce back EMF of the AC motor (30), thereby enabling the step of generating a toque current regulating signal to achieve a toque current component needed to drive the AC motor (30) at a desired speed despite a limitation on DC voltage available to the power converter (20).
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Ma Jack Daming
Wang Zheng
Zhou George You
Ip Paul
Palguta Larry J.
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