Title :
An evaluation of model-based stator resistance estimation for induction motor stator winding temperature monitoring
Author :
Lee, Sang-Bin ; Habetler, Thomas G. ; Harley, Ronald G. ; Gritter, David J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
3/1/2002 12:00:00 AM
Abstract :
In this paper, the feasibility of using an estimate of the stator resistance (Rs) as an indicator of stator winding temperature (Ts) is evaluated. The advantages of resistance-based temperature monitoring over conventional thermal model-based methods are presented. Since obtaining an accurate estimate of Rs is critical for this approach, an investigation of existing Rs estimation schemes, and an analysis showing the sensitivity of model-based Rs estimation due to the uncertainties in motor parameters and variables, are given. It is shown that Rs estimation is difficult during high-speed operation, because estimated R s becomes sensitive to errors in motor electrical parameters and variables, as the input excitation frequency (speed) increases. A new Rs estimation scheme for the purpose of monitoring the temperature in steady state is proposed. Experimental results on a line-connected induction machine verify the validity of the proposed method and the analysis
Keywords :
electric resistance; induction motors; machine theory; monitoring; parameter estimation; sensitivity analysis; stators; high-speed operation; induction motor stator winding temperature monitoring; input excitation frequency; line-connected induction machine; motor electrical parameters; motor parameters uncertainties; resistance-based temperature monitoring; stator resistance estimation; steady state; thermal model; thermal protection; Frequency estimation; Induction machines; Induction motors; Insulation; Protection; Rotors; Stator windings; Temperature measurement; Temperature sensors; Thermal resistance;
Journal_Title :
Energy Conversion, IEEE Transactions on