Speed control system for pump motor

Details Speed control system for pump motor Speed control system for pump motor

Category

G - Physics

Subcategory

05

Subsubcategory

D

CPC

341/91, 318/98

IPC codes

G05D 13/62 (2006.01)

Type

Patent

Patent number

CA 1335513

Description

To provide smooth constant flow, a liquid chromatographic system comprises: a chromatographic column having an inlet; a pump for supplying fluid to the inlet of the chromatographic column; a power means for a pump motor; a feedback loop means for controlling said power means; means for alternately energizing and de-energizing said positive and negative feedback control means; said negative feedback control means receiving a signal from said means for measuring flow rate and including means for comparing said signal with said corrected flow rate reference signal while said second feedback loop is energized to generate an error signal controlling said power means; and said positive feedback control means applying an acceleration voltage to said motor from a time a preset period after the initiation of a return stroke of said piston until after a timed duration.

Application Number

615873

Affiliated with

Also associated with

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