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Title: System and method to determine electric motor efficiency using an equivalent circuit

Patent ·
OSTI ID:1224437
;

A system and method for determining electric motor efficiency includes a monitoring system having a processor programmed to determine efficiency of an electric motor under load while the electric motor is online. The determination of motor efficiency is independent of a rotor speed measurement. Further, the efficiency is based on a determination of stator winding resistance, an input voltage, and an input current. The determination of the stator winding resistance occurs while the electric motor under load is online.

Research Organization:
Eaton Corporation, Cleveland, OH (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FC36-04GO14000
Assignee:
Eaton Corporation (Cleveland, OH)
Patent Number(s):
9,170,303
Application Number:
13/088,846
OSTI ID:
1224437
Resource Relation:
Patent File Date: 2011 Apr 18
Country of Publication:
United States
Language:
English

References (19)

Torque controller for an AC motor drive and AC motor drive embodying the same patent June 1987
Method of determining the efficiency of asynchronous motors and apparatus for carrying out the method patent August 1997
Sensorless estimation of rotor temperature in induction motors patent March 2000
Method of monitoring placement of voltage/current probes on motors patent May 2001
Motor condition and performance analyzer patent October 2001
Optimization tool for assembly workcell layout patent October 2002
Method and apparatus of detecting internal motor faults in an induction machine patent November 2004
Induction motor module and motor incorporating same patent March 2005
System and method for identifying operational parameters of a motor patent November 2006
Motor parameter estimation method and apparatus patent February 2007
Estimation of real-time power system quantities using time-synchronized measurements patent March 2009
Indirect rotor resistance estimation system and method patent July 2009
Variable stiffness support patent January 2010
Method and apparatus for estimating induction motor rotor temperature patent August 2010
A comparison of spectrum estimation techniques for sensorless speed detection in induction machines journal January 1997
A self-tuning closed-loop flux observer for sensorless torque control of standard induction machines journal September 1997
An on-line stator winding resistance estimation technique for temperature monitoring of line-connected induction machines
  • Lee, S. -B.; Habetler, T. G.
  • 2001 IEEE Industry Applications Society 36th Annual Meeting - IAS'01, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248) https://doi.org/10.1109/IAS.2001.955744
conference January 2001
Comparison of induction motor field efficiency evaluation methods conference January 1996
Sensorless speed measurement using current harmonic spectral estimation in induction machine drives journal January 1996

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