Magnetic tachometer for disk drives

Details Magnetic tachometer for disk drives Magnetic tachometer for disk drives

G - Physics

11

B

352/21.21, 340/1

G11B 5/54 (2006.01) G01P 3/46 (2006.01) G11B 5/55 (2006.01) G11B 21/02 (2006.01)

Patent

CA 1220549

ABSTRACT 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 rejec- tion.

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