SAFETY SYSTEM, AND SAFETY APPARATUS

PROBLEM TO BE SOLVED: To constitute a safety apparatus only with one main magnet connector although two magnet connectors are required to interrupt power supply to a three-phase motor to star delta start for duplication in a conventional system. SOLUTION: Since two back electromotive force detection...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAYAMA AKIYUKI, HIGUCHI TOSHIYUKI, AKAGI TETSUYA, HASHIMOTO MINORU, KAMIZONO DAICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERATION HEATING LIGHTING MECHANICAL ENGINEERING SAFETY DEVICES IN GENERAL THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To constitute a safety apparatus only with one main magnet connector although two magnet connectors are required to interrupt power supply to a three-phase motor to star delta start for duplication in a conventional system. SOLUTION: Since two back electromotive force detection parts of a stop detection unit 3 are connected to both ends of winding of U-phase and W-phase in the three-phase motor 2 in the safety apparatus, stop of the three-phase motor 2 can be detected based on a back electromotive force occurring in winding of the three-phase motor 2 in a state where a star connection switch 8 and a delta connection switch 9 are turned off at the time of power supply interruption when a main switch 7 is turned off. Namely, it is not necessary to install two main switches 7 for duplication since it is not necessary to turn on the star connection switch 8 or the delta connection switch 9 for detecting the back electromotive force. COPYRIGHT: (C)2009,JPO&INPIT