Current control loop bias calibration by integration

Details Current control loop bias calibration by integration Current control loop bias calibration by integration

2006-05-02

2006-05-02

Ip, Paul (Department: 2837)

Electricity: motive power systems

Positional servo systems

C318S561000, C360S067000

Reexamination Certificate

active

07038417

ABSTRACT:
Ascertaining through integration a bias calibration level for a current control loop of a driver motor of a tape drive. The driver motor includes a current controller having as inputs a demand signal, a bias signal, and a feedback signal. The current controller includes an integrator coupled to the output. The method includes setting the demand signal to a zero current level, setting the bias signal to a level that substantially prevents the integrator from driving itself high, stepping down the bias signal to form a stepped down bias signal, measuring a sense parameter at the output of the current controller, determining whether the sense parameter is high for the stepped down bias signal, and setting the bias calibration level to a level sufficiently above the stepped down bias signal such that the integrator is not driven high when the demand signal is set to the zero current level.

REFERENCES:
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patent: 5872674 (1999-02-01), Eddy
patent: 6252735 (2001-06-01), Chung et al.
patent: 6304472 (2001-10-01), Nagasu et al.
patent: 6420910 (2002-07-01), Contreras et al.
patent: 6476602 (2002-11-01), Gray
patent: 2004/0179829 (2004-09-01), Phillips et al.

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