Induction Motor Efficiency Evaluation Using a New Concept of Stator Resistance

This paper presents an air-gap torque (AGT)-based method for efficiency estimation of induction motors. A new concept of stator resistance that includes the mechanical losses effect is proposed. This new stator resistance is estimated through a particle swarm optimization approach based on the stato...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2015-11, Vol.64 (11), p.2908-2917
Main Authors: Salomon, Camila P., Sant'Ana, Wilson C., Borges da Silva, Luiz E., Lambert-Torres, Germano, Bonaldi, Erik L., de Oliveira, Levy E. L., Borges da Silva, Jonas G.
Format: Article
Language:English
Subjects:
Air-gap torque (AGT)
efficiency estimation
Estimation
Induction motors
Instrumentation
Line voltage
Mathematical analysis
Mathematical model
On-line systems
Optimization
particle swarm optimization (PSO)
Resistance
Rotors
stator resistance
Stators
Torque
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Summary:This paper presents an air-gap torque (AGT)-based method for efficiency estimation of induction motors. A new concept of stator resistance that includes the mechanical losses effect is proposed. This new stator resistance is estimated through a particle swarm optimization approach based on the stator flux equations and minimization of torque error at the rated operation point. Then, the obtained stator resistance is used in the AGT equations to estimate the shaft torque and then the efficiency. Moreover, the rotor speed is estimated using induction motor current signature analysis. Thus, the proposed methodology for induction motor efficiency estimation relies only on line currents, line voltages, and nameplate data, being appropriate for in-service applications. Finally, the simulation and experimental results are presented to validate the proposed method at different load conditions.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2015.2437632