Self-regulating electronic tachometer

Details Self-regulating electronic tachometer Self-regulating electronic tachometer

1977-11-23

1980-01-15

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318594, 318603, G05B 501

Patent

active

041841085

ABSTRACT:
An electronic tachometer comprising an integrator having its output coupled to a variable gain amplifier and responsive to an input signal representative of the acceleration of a moveable load, such as a head assembly of a disk drive, for producing a coarse velocity signal at the output of the variable gain amplifier indicative of the load velocity, a tachometer gain correction circuit including another integrator coupled to receive the coarse velocity signal to produce a coarse distance signal indicative of distance traveled by the load and means for combining the coarse distance signal with a reference distance signal to produce a distance error signal which functions to adjust the gain of the variable gain amplifier so as to vary the coarse velocity signal to make the coarse distance signal equal to the reference distance signal, and accumulative error compensation means coupled to receive a gain indicative signal derived from the distance error signal to produce a signal input to the tachometer integrator which compensates for accumulative error in the tachometer output, whereby the tachometer accurately indicates load velocity.

REFERENCES:
patent: 4006394 (1977-02-01), Cuda et al.

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