Method and apparatus for controlling an electric motor

The present invention provides a method for controlling the output power of a permanent magnet electric motor ( 102 ) using a control means ( 106 ). The control means ( 106 ) includes a means ( 134 ) for measuring motor speed ( 134 ) and motor phase current ( 134 ), and a means for controlling motor...

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Bibliographische Detailangaben
Hauptverfasser:	KENNEDY BYRON J, PATTERSON DEAN J, CAMILLERI STEVEN P, EMBERY LYELL D, ROHOZA RAFAL P
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRICITY ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL GENERATION MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS PHYSICS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	The present invention provides a method for controlling the output power of a permanent magnet electric motor ( 102 ) using a control means ( 106 ). The control means ( 106 ) includes a means ( 134 ) for measuring motor speed ( 134 ) and motor phase current ( 134 ), and a means for controlling motor phase current ( 110 ) to a desired level. A known relationship between motor phase current and motor torque is then employed by a torque controller so that motor shaft torque can be controlled. A power limiting means ( 128 ) then limits the output mechanical power of the motor by dividing a limit value of power by the motor speed to produce a maximum allowable torque setting for that speed.