DocumentCode :
2713651
Title :
A Nonintrusive Efficiency Estimation Method for In-Service Motor Testing using a Modified Induction Motor Equivalent Circuit
Author :
Bin Lu ; Habetler, Thomas G. ; Harley, Ronald G.
Author_Institution :
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA, Phone: 404-894-9829, Fax: 404-894-4641, binlu@ece.gatech.edu
fYear :
2006
fDate :
18-22 June 2006
Firstpage :
1
Lastpage :
6
Abstract :
On average, industrial motors operate at no more than 60% of their rated load, and thus at reduced efficiency which results in wasted energy. Motor efficiency evaluation enables the energy savings in industry. However, because of the uninterrupted characteristic of industrial processes, traditional methods defined in IEEE Std-112 cannot be used for these in-service motors. This paper proposes a novel nonintrusive method for in-service motor efficiency estimation based on a modified induction motor equivalent circuit using only motor terminal quantities and nameplate information. Rotor speed and stator resistance are extracted from stator voltages and currents. No load test is eliminated by using empirical values instead. Rotor stray-load loss is considered in the equivalent circuit by adding an equivalent resistor in series with the rotor circuit, and its value is derived from the assumed stray-load loss suggested in IEEE Std-112. The parameters of the equivalent circuit are solved using only stator voltage and current phasors and motor nameplate data. Three numerical root finding methods are adopted to guarantee the solution of the parameters under any situations. Finally, the proposed method is verified by testing a 7.5 hp TEFC induction motor. Experimental results are presented and analyzed.
Keywords :
Efficiency estimation; IEEE Std-112; Newton-Raphson method; equivalent circuit; in-service testing; induction motors; particle swam optimization; simulated annealing method; Circuit testing; Data mining; Equivalent circuits; Induction motors; Resistors; Rotors; Stators; Voltage; Efficiency estimation; IEEE Std-112; Newton-Raphson method; equivalent circuit; in-service testing; induction motors; particle swam optimization; simulated annealing method;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialists Conference, 2006. PESC '06. 37th IEEE
ISSN :
0275-9306
Print_ISBN :
0-7803-9716-9
Type :
conf
DOI :
10.1109/PESC.2006.1712010
Filename :
1712010
Link To Document :
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