Dual mode servo

Details Dual mode servo Dual mode servo

1983-11-14

1986-03-04

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318592, 318561, 318619, 318616, G05B 1118, G05B 1300

Patent

active

045742278

ABSTRACT:
A dual mode, digital servo positioning system controls servo motor current by a processor-generated current control set point in conjunction with velocity feedback. When the motor has advanced to the vicinity of a target position, the processor opens the velocity feedback loop and reduces servo amplifier gain, such that the set point controls motor current without velocity feedback. This open loop condition provides a springy servo response that eliminates oscillation due to small deviations from target position caused by electronic drift or gravity. Position information is provided to the processor by means of quadrature encoded tachometer pulses from the motor.

REFERENCES:
patent: 4184108 (1980-01-01), Sordello
patent: 4219765 (1980-08-01), Morsing
patent: 4282469 (1981-08-01), Moriyama
patent: 4315198 (1982-02-01), Lin

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