Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1977-06-29
1980-04-29
Rubinson, Gene Z.
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318594, 318616, G05B 1300
Patent
active
042008271
ABSTRACT:
A positioning system for moving a member between positions in time optimal fashion employs concurrent "feedforward" and "feedback" control. The feedforward control system provides major control and the feedback control system provides minor control to correct for deviations between the actual and a nominal system. The feedback loop may thus be of low bandwidth permitting desensitization to high frequency disturbances or the employment of inherently low bandwidth controlled variables.
The "feedforward" control function includes successive portions of opposite polarity corresponding to acceleration and deceleration of the member and also includes a subtractive velocity related component. This function represents the approximate current input to an electromagnetic coil actuator of a nominal system required to move such a member between positions in time optimal fashion.
REFERENCES:
patent: 3657524 (1972-04-01), Bakke
patent: 3699555 (1972-10-01), Duvall
patent: 3721882 (1973-03-01), Helms
patent: 3749997 (1973-07-01), Cohen et al.
patent: 3839664 (1974-10-01), Dirks et al.
patent: 4006394 (1977-02-01), Cuda et al.
Oswald, R. K., "Design of a Disk File Head Positioning Servo," IBM J. Res. & Development, Nov. 1974, pp. 506-512.
Cummins Richard E.
Indyk Eugene S.
International Business Machines - Corporation
Moss Robert D.
Rubinson Gene Z.
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