Magnetic disk device

Abstract

Abstract PURPOSE:To improve the suppression rate of a position deviation by inputting a position deviation signal to a position deviation correction circuit and adding a correction signal outputted from the position deviation correction circuit to a position deviation generating circuit. CONSTITUTION:A position deviation correction circuit 15 consists of a closed loop circuit 16 and a proportion element 17. A dead time element 18 is provided so as to apply positive feedback of the output to the input side. The element 18 delays a position deviation E(S) by a disk fundamental rotation period L and outputs the result. Since the output of the element 18 is fed back positively to the input side, the open loop gain is infinite at a frequency k/L being a multiple of (k) of a disk rotation frequency 1/L. The element 17 outputs a signal at a multiple of K of an input signal. Thus, the suppressing rate of the control is improved by nearly 50 - 60dB.

Inventors

• 👤 Makoto Nishimura
• 👤 誠 西村

Bibliographic Details