Importance

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Abstract

Method for controlling a drive motor of a positive displacement vacuum pump A method for controlling a drive motor of a positive displacement vacuum pump comprises the following method steps: storing a curve (32) indicating a respective speed value n of the drive motor for inlet pressure values p, wherein the curve (32) comprises: an upper range (34) for inlet pressure values p larger than or equal to an upper limit pressure p.sub.1, with a single constant upper speed value n.sub.1 being associated with said upper range (34), and an alteration range (36) for inlet pressure values p smaller than the upper limit pressure p.sub.1, wherein in the alteration range different speed values n.sub.v are associated with the inlet pressure values p; determining the inlet pressure value p; determining the speed n associated with the inlet pressure value p in the curve (32); and operating the drive motor (20) at the determined speed n. By providing an alteration range the vacuum pump can always be operated at a speed which allows maximum effective suction capacity of the positive displacement pump.

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First Claim