CONTROL TECHNIQUES FOR MOTOR DRIVEN SYSTEMS UTILIZING BACK-EMF MEASUREMENT TECHNIQUES

A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector may be implemented on the same integrated circuit as the driver, and dyn...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	CAHILL ALAN PATRICK, CASEY GARY, LYDEN COLIN G, ROCHE THOMAS F, CALPE MARAVILLA JAVIER, CLEARY JOHN A, ENGLISH EOIN EDWARD, JIMENEZ CHRISTIAN
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 ELECTRICITY GENERATION MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector may be implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.