CONTROLLER FOR INDUCTION MOTOR

PURPOSE:To allow an induction motor to be stably driven with current respon siveness fully ensured even in high speed range, by increasing the frequency of a carrier wave when the motor speed exceeds the limits where the pulse number of a PWM signal comes to be reduced rapidly. CONSTITUTION:A DC pow...

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Bibliographische Detailangaben
Hauptverfasser:	SAKAI KEIJIRO, UEDA AKITERU, MUTO NOBUYOSHI, TOMITA HIROYUKI, IGARASHI SADAYUKI
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:	PURPOSE:To allow an induction motor to be stably driven with current respon siveness fully ensured even in high speed range, by increasing the frequency of a carrier wave when the motor speed exceeds the limits where the pulse number of a PWM signal comes to be reduced rapidly. CONSTITUTION:A DC power supply 10 is applied to an induction motor 40 through a PWM inverter 20. Comparators 91, 93 compares each voltage com mand signal with the carrier wave from a carrier wave generator 113. They produce three-phase PWM signals and a gate drive circuit 100 produces gate signals in correspondence with these PWM signals and applies them to each power switching element of a PWM inverter 20. The carrier wave frequency from the carrier wave generator 113 is variably controlled by the command from a carrier wave frequency command generator 112 in accordance with the rotating speed of the induction motor 40.