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Machine and method for monitoring the state of a safety bearing of a machine

  • US 9,279,735 B2
  • Filed: 04/16/2010
  • Issued: 03/08/2016
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. A method for monitoring wear of a safety bearing of a rotor shaft of a machine, wherein the rotor shaft is supported by a magnetic bearing, the safety bearing having an outer ring and an inner ring arranged for rotation with respect to the outer ring, the method comprising the steps of in the following order:

  • switching the magnetic bearing off for monitoring the state of the safety bearing,catching a rotor shaft of the machine with the safety bearing when the magnetic bearing is switched off, andwhile the magnetic bearing remains switched offrotating the rotor shaft with the machine by using a defined motion sequence,measuring a physical variable of the safety bearing with a sensor, wherein the physical variable is a distance between the outer ring and the inner ring, anddetermining the wear of the safety bearing from the measured distance between the outer ring and the inner ring.

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