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High rotational speed vacuum pump

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Title: High rotational speed vacuum pump.
Abstract: A high rotational speed vacuum pump (10) includes a compressor (12), a drive motor (14) for driving said compressor (12), and a motor control unit (16) for operating said drive motor (14) at a constant nominal rotational frequency. Depending on the basic conditions, undesirably strong oscillations may occur at the compressor (12) during compressor operation at the nominal rotational frequency. These undesirably strong oscillations cause the bearings to be excessively stressed. To reduce the oscillation stress of the compressor and/or the vacuum pump, an activatable rotational frequency correction device (18) is associated with the motor control unit (16). The correction device constantly corrects the nominal frequency by a rotational frequency correction value of max. 10% of the nominal rotational frequency when the rotational frequency correction device (18) is activated. This allows the rotational frequency of the drive motor (14) to be changed in a simple manner when strong natural oscillations of the compressor (12) and/or the vacuum pump (10) occur such that resonance effects and the like can be avoided. ...

USPTO Applicaton #: #20090202360 - Class: 417 441 (USPTO) - 08/13/09 - Class 417 

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The Patent Description & Claims data below is from USPTO Patent Application 20090202360, High rotational speed vacuum pump.

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US 20090202360 A1
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