Electronic apparatus for positioning and using AC motors

Details Electronic apparatus for positioning and using AC motors Electronic apparatus for positioning and using AC motors

1976-12-17

1978-05-09

Rubinson, Gene Z.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318612, 318616, 318203R, G05B 1300

Patent

active

040889386

ABSTRACT:
A solid-state valve actuator control system using three-phase AC motors as prime movers having a summing point with a set point input, a position feedback input and a velocity feedback input. Velocity feedback being produced by differentiating position feedback. Summing point output error signal provides input to each of three integrators. Integrator outputs, synchronized with the three-phase AC power input, supply control signals to an AC solid-state power bridge having as its power input three-phase AC and as its power output controlled three-phase AC to drive three-phase AC motors in the proper direction. For small errors, the AC drive supplied to the prime mover is proportional to the magnitude of the error. For large errors, full voltage is applied to the prime mover. Motor transients are minimized by the proportional band on start-up and on motor reversal.

REFERENCES:
patent: 3470428 (1969-09-01), Gill et al.
patent: 3742327 (1973-06-01), Nettles
patent: 3777122 (1973-12-01), Borsboom
patent: 4025839 (1977-05-01), Maury

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