Method of control of magnetic sound of alternating current rotating machine

A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n-1-th order frequency in inverse turn on a multi-phase alternating current with reference to a basic frequency component of the multi-phase alternating current...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHINAGA SOICHI, WAKABAYASHI KENICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEAF-AID SETS DYNAMO-ELECTRIC MACHINES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERATION LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS
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Beschreibung
Zusammenfassung:	A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n-1-th order frequency in inverse turn on a multi-phase alternating current with reference to a basic frequency component of the multi-phase alternating current supplied to an armature of the alternating current rotating machine of multiple phases so as to reduce the n-th order harmonic components of the basic frequency component among radial direction magnetic vibrating forces generated in the radial direction in a core of the alternating current rotating machine.