Speed control apparatus in magnetic disk apparatus

Details Speed control apparatus in magnetic disk apparatus Speed control apparatus in magnetic disk apparatus

1986-08-29

1988-02-09

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

360 77, 360 78, G05B 1300

Patent

active

047243694

ABSTRACT:
A speed control apparatus includes a speed signal-holding circuit. Even if a discrete portion occurs in the position signal, i.e., if an abnormal signal component is included in the speed signal derived from position signal differentiation, the speed signal held by the holding circuit is output to prevent erroneous operation caused by the abnormal signal. In a magnetic disk apparatus incorporating the speed control apparatus, the magnetic head is driven before a seek instruction is completely input, and the position signal phases are switched at proper timings, thereby reliably performing both speed and positioning control operations of the magnetic head, at high speed.

REFERENCES:
patent: 4516178 (1985-05-01), Lee

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