Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1986-06-09
1987-09-29
Roskoski, Bernard
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
360 78, G05B 1300, G11B 2108
Patent
active
046971270
ABSTRACT:
A controller for a voice coil motor driven disk file actuator is described. The device has an online adjustable gain characteristic for controlling movement of the actuator assembly and an estimator that estimates actuator velocity and bias. Forward gain is estimated from position and coil current measurements and compared with a nominal value to create an error signal used to adjust the controller and estimator gain characteristics. The control technique allows changes in the open loop system without changing the closed loop performance. By monitoring loop gain it is possible to alter compensator gains to maintain a constant closed loop performance.
REFERENCES:
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patent: 4133011 (1979-01-01), Kurzweil
patent: 4263627 (1981-04-01), Rose
patent: 4314291 (1982-02-01), Oda
patent: 4349868 (1982-09-01), Brown
patent: 4498036 (1985-02-01), Salemka
patent: 4609855 (1986-09-01), Andrews
Anderson Todd B.
Ottesen Hjalmar H.
Resman John B.
Stich Michael C.
International Business Machines - Corporation
Keane Patrick C.
Lahtinen Robert W.
Roskoski Bernard
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