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

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.
 [1];  [2];  [1]
  1. (Knoxville, TN)
  2. (Clinton, TN)
Issue Date:
OSTI Identifier:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5578937
Contract Number:
Research Org:
Country of Publication:
United States
instrument; analysis; electric; motors; based; slip-poles; component; monitoring; condition; speed; operating; motor; remote; location; derived; current; signal; magnitude; provides; basis; monitor; frequency; result; simple-to-understand; health; easy-to-use; package; straightforward; indications; running; rotor; bar; synthesized; sound; audible; indication; provided; device; relatively; untrained; worker; diagnose; field; requiring; presence; trained; engineer; technician; electric motor; motor current; remote location; current signal; motor speed; slip-poles component; electric motors; component provide; /324/318/