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Title: System and method for determining stator winding resistance in an AC motor using motor drives

Patent ·
OSTI ID:1082734
; ;

A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.

Research Organization:
Eaton Corporation (Cleveland, OH)
Sponsoring Organization:
USDOE
DOE Contract Number:
FC36-04GO14000
Assignee:
Eaton Corporation (Cleveland, OH)
Patent Number(s):
8,384,338
Application Number:
12/363,413
OSTI ID:
1082734
Country of Publication:
United States
Language:
English

References (12)

Motor parameter estimation method and apparatus patent February 2007
System for speed-sensorless control of an induction machine patent October 2000
Stator resistance adaptation in sensorless PMSM drives patent June 2011
Vector-controlled unrestricted frequency changer (UFC) system and variable speed AC motor drive using such a system patent December 1987
Device and method for estimating the resistance of a stator winding for an AC induction motor patent September 2003
Measurement of motor winding temperature patent April 1978
Electric motor controller with temperature protection patent April 1996
Stator resistance detector for use in electric motor controllers patent March 1996
Detection of loss of cooling air to traction motors patent January 2005
Sensorless estimation of rotor temperature in induction motors patent March 2000
Sensorless rotor tracking of induction machines with asymmetrical rotor resistance patent May 2000
Method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine patent July 2010

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