Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-03-10
1997-07-22
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, H02P 700
Patent
active
056507089
ABSTRACT:
An inverter control apparatus for driving a polyphase AC motor for preventing abrupt changes in motor drive currents when switching of one phase is stopped. The apparatus includes a signal generator for generating duty signals of drive signals of respective phases on the basis of a generated reference waveform and a signal modifier for selecting one of the duty signals of one phase, holding it at a predetermined level, and modifying the duty signals of other phases according to the value required to hold the selected duty signal. On the basis of three-phase signal voltage levels, a decision is made on voltage fixing phase intervals by a phase decision circuit, and shift values are determined by an adder at every voltage fixing phase interval. Shift values are selected by a multiplexer according to the outputs of the phase decision circuit and added to triangular wave voltage. Resultant sum values are compared with the three-phase signal voltages to form a three-phase PWM signal.
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Egami Tsuneyuki
Fujita Hiroshi
Sawada Takeshi
Takeuchi Kanji
Tsuji Hiroya
Nippondenso Co. Ltd.
Wysocki Jonathan
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