Digital control for rapid refill of a liquid chromatograph pump

Details Digital control for rapid refill of a liquid chromatograph pump Digital control for rapid refill of a liquid chromatograph pump

1985-02-11

1987-02-17

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 53, F04B 4906

Patent

active

046436499

ABSTRACT:
A liquid pump motor control for a liquid chromatograph. The control detects when the pump needs to be refilled. Then, the pump motor is accelerated at a first rate for a given number of pulses. Then the motor is accelerated at substantially its maximum rate until a selected maximum speed is reached. Thereafter the speed is maintained at its maximum until the time calculated to begin deceleration. The motor is then decelerated substantially at its maximum deceleration rate until the speed is close to the final desired speed. Then deceleration occurs at a slower rate for a fixed number of pulses. The number of pulses applied to the stepping motor from the beginning of acceleration until the end of deceleration is constant regardless of the beginning or ending pulse rates.

REFERENCES:
patent: 3847507 (1974-11-01), Sakiyama et al.
patent: 4131393 (1978-12-01), Magnussen, Jr.
patent: 4137011 (1979-01-01), Rock
patent: 4225290 (1980-09-01), Allington
patent: 4326837 (1982-04-01), Gilson et al.
patent: 4352636 (1982-10-01), Patterson et al.
patent: 4359312 (1982-11-01), Funke et al.
patent: 4474309 (1984-10-01), Solomon
patent: 4552513 (1985-11-01), Miller et al.

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