Browse Prior Art Database

Automatic Servo Gain Calibration Procedure for High Performance Tape Drive

IP.com Disclosure Number: IPCOM000116946D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Cheung, KM: AUTHOR [+2]

Abstract

An automated procedure for adjusting the gain in a servo loop to account for variations in electrical and mechanical properties of an actuator in a servo system is disclosed. The procedure is implemented in a digital control computer without any additional hardware.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Automatic Servo Gain Calibration Procedure for High Performance Tape
Drive

      An automated procedure for adjusting the gain in a servo loop
to account for variations in electrical and mechanical properties of
an actuator in a servo system is disclosed.  The procedure is
implemented in a digital control computer without any additional
hardware.

      The invention concerns the automation of the process of
adjusting the gain in a servo loop to account for variations in
electrical and mechanical properties of an actuator in servo system.
The objective is to ensure that all servo systems maintain the
similar operating bandwidth for guaranteed servo performance in each
product unit that has a servo system.

      The automated procedure is to use a digital signal processor to
adjust the loop gain to meet the specified system bandwidth.  The
procedure is iterative and it involves generating an external (with
respect to the servo loop) sinusoidal signal and injecting into the
servo loop; an optimal frequencyis selected for the injected signal.
The real time signals in the servo loop at points right before and
after the external signal injection point are monitored and the gain
in the servo compensator adjusted until the ratio of the amplitudes
of the two monitored signals is equal to the amplitude of the nominal
transfer function of the servo loop at the calibration frequency.

      The calibration process consists of (1) a sinusoidal signal
generator; (2) t...