Comparison among Methods for Induction Motor Low-Intrusive Efficiency Evaluation Including a New AGT Approach with a Modified Stator Resistance

Camila Paes Salomon, Wilson Cesar Sant’Ana, Germano Lambert-Torres, Luiz Eduardo Borges da Silva, Erik Leandro Bonaldi and Levy Ely de Lacerda De Oliveira
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Camila Paes Salomon: Gnarus Institute, Itajuba 37500-052, Brazil
Wilson Cesar Sant’Ana: Gnarus Institute, Itajuba 37500-052, Brazil
Germano Lambert-Torres: Gnarus Institute, Itajuba 37500-052, Brazil
Luiz Eduardo Borges da Silva: Institute of System Engineering and Information Technology, Itajuba Federal University, Itajuba37500-903, Brazil
Erik Leandro Bonaldi: Gnarus Institute, Itajuba 37500-052, Brazil
Levy Ely de Lacerda De Oliveira: Gnarus Institute, Itajuba 37500-052, Brazil

Energies, 2018, vol. 11, issue 4, 1-21

Abstract: Induction motors consume a great portion of the generated electrical energy. Moreover, most of them work at underloaded conditions, so they have low efficiencies and waste a lot of energy. Because of this, the efficiency estimation of in-service induction motors is a matter of great importance. This efficiency estimation is usually performed through indirect methods, which do not require invasive measurements of torque or speed. One of these methods is the modified Air-Gap Torque (AGT) method, which only requires voltage and current data, the stator resistance value, and the mechanical losses. This paper approaches the computation of a modified stator resistance including the mechanical losses effect to be applied in the AGT method for torque and efficiency estimation of induction motors. Some improvements are proposed in the computation of this resistance by using a direct method, as well as the possibility to estimate this parameter directly from the nameplate data of the induction motor. The proposed methodology only relies on line voltages, currents, and nameplate data and is not intrusive. The proposed methodology is analyzed through simulation and validated through experimental results with three-phase induction motors. Also, a comparison of methods for in-service induction motors efficiency estimation is presented for the tested motors.

Keywords: condition monitoring; efficiency estimation; air-gap torque; induction motors; stator resistance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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