Magnetic tachometer for disk drives

Details Magnetic tachometer for disk drives Magnetic tachometer for disk drives

1983-06-16

1986-11-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

360106, 360109, G01P 346

Patent

active

046225161

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 rejection.

REFERENCES:
patent: 4150314 (1979-04-01), Zabler et al.
patent: 4150407 (1979-04-01), Dijkstra
patent: 4196456 (1980-04-01), Manzke et al.
patent: 4346416 (1982-08-01), Riggle et al.
patent: 4375070 (1983-02-01), Isozaki et al.

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