Magnetic tachometer for disk drives

A magnetic tachometer for generating a signal as a function of the velocity of a transducer positioning arm in a disk drive. The tachometer is formed by a pair of fixed parallel coils separated by a distance sufficient to allow a magnet, attached to a counterbalance portion of the rotary positioning...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	PARIKH, SHYAM C, VESESKIS, KENNETH F, HEARN, PATRICK L, RIGGLE, CHARLES M
Format:	Patent
Sprache:	eng
Schlagworte:	INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A magnetic tachometer for generating a signal as a function of the velocity of a transducer positioning arm in a disk drive. The tachometer is formed by a pair of fixed parallel coils separated by a distance sufficient to allow a magnet, attached to a counterbalance portion of the rotary positioning arm, to move therebetween and thus to generate a voltage as a function of the velocity of the magnet. The coils are each wound over a thin armature member which is saturated by the magnet's magnetic field and they are differentially coupled to produce common mode rejection.