LIFT OFF SPEED DETECTION

Abstract: a compressor having a rotational shaft supported by a plurality of air foil bearings, a frequency sensor for detecting a frequency of a signal emitted by the device during rotation of the rotational shaft, a controller for detecting a lift off speed of the plurality of air foil bearings in response to the frequency of the signal, and a memory for storing the lift off speed, wherein the memory is communicatively coupled to a device controller for controlling a rotational speed of the rotational shaft in response to the lift off speed wherein the detection of the lift off speed is made in response to a sudden change in the frequency of the signal emitted by the device during a coast down of the compressor from a maximum rotational speed to a zero rotational speed.

Inventor(s): Radu Florea, Frederic Daguin

CPC Classification: G01H1/006 (Measuring {characteristics of} vibrations in solids by using direct conduction to the detector (, take precedence))

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