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Instrument for analysis of electric motors based on slip-poles component

United States Patent

5,578,937
November 26, 1996
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A new instrument for monitoring the condition and speed of an operating electric motor from a remote location. The slip-poles component is derived from a motor current signal. The magnitude of the slip-poles component provides the basis for a motor condition monitor, while the frequency of the slip-poles component provides the basis for a motor speed monitor. The result is a simple-to-understand motor health monitor in an easy-to-use package. Straightforward indications of motor speed, motor running current, motor condition (e.g., rotor bar condition) and synthesized motor sound (audible indication of motor condition) are provided. With the device, a relatively untrained worker can diagnose electric motors in the field without requiring the presence of a trained engineer or technician.
Haynes; Howard D. (Knoxville, TN), Ayers; Curtis W. (Clinton, TN), Casada; Donald A. (Knoxville, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 414,679
March 31, 1995
GOVERNMENT RIGHTS STATEMENT This invention was made with Government support under contract DE-AC05-840R21400 awarded by the U.S. Department of Energy to Martin Marietta Energy Systems, Inc., and the Government has certain rights in the invention.