INVERTER DEVICE AND CONTROL METHOD

PROBLEM TO BE SOLVED: To minimize excessive current flow due to pulsation of the output current from an inverter device for driving a three-phase induction motor when a transition is made from three-phase PWM control where three-phases are switched entirely to a two-phase PWM control where switching...

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Bibliographische Detailangaben
Hauptverfasser:	TOKASHIKI MUTSUO, KAMEZAWA TOMOYA
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To minimize excessive current flow due to pulsation of the output current from an inverter device for driving a three-phase induction motor when a transition is made from three-phase PWM control where three-phases are switched entirely to a two-phase PWM control where switching of one phase is brought to rest.SOLUTION: In the inverter device which inverts a DC voltage to an AC voltage of an arbitrary frequency by PWM control, phase voltage waveforms calculated in a phase voltage waveform generation processing block 201 for three-phase PWM where the output phase voltage waveform of the inverter is calculated from an output frequency command and an output voltage command, a phase voltage waveform generation processing block 202 for two-phase PWM, and a voltage waveform transient processing block 203 for three-phase/two-phase transition are switched in a PWM output block 205 based on a signal from a switching determination processing block 204, and output to a PWM output generation block 207 thus generating a PWM wave.