Apparatus for controlling rotational servo by using frequency pu

Details Apparatus for controlling rotational servo by using frequency pu Apparatus for controlling rotational servo by using frequency pu

1996-07-22

1998-03-03

Edun, Muhammad N.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, 369 59, G11B 700

Patent

active

057243298

ABSTRACT:
An apparatus for controlling a rotational servo by using a frequency pulse signal generator is provided. The rotational servo controlling apparatus has a frequency pulse signal generator for generating a frequency pulse signal indicating the current rotational speed of the motor. A track count signal generator counts the number of tracks from the current track to an object track, and generates a corresponding track count signal. A microprocessor receives the frequency pulse and the track count signals and issues a command to generate a reference frequency pulse signal. A reference pulse signal generator receives the command and generates the reference frequency pulse signal. A phase comparator compares the frequency pulse signal and the reference frequency pulse signal and issues a comparison signal. The rotational servo controls the rotational speed of the spindle motor to rotate at a speed proper for the reading of data from the object track, i.e., so that the frequency pulse signal is identical to the reference frequency pulse signal. Therefore, a stable and rapid rough search can be performed.

REFERENCES:
patent: 5111305 (1992-05-01), Yamashita

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