Influence of Equivalent Circuit Resistances on Operating Parameters on Three-Phase Induction Motors with Powers up to 50 kW

Marcel Torrent and Balduí Blanqué
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Marcel Torrent: Grupo de Accionamientos Eléctricos con Conmutación Electrónica GAECE, Department of Electrical Engineering (DEE), Escuela Politécnica Superior de Ingeniería de Vilanova i la Geltrú (EPSEVG), Universitat Politècnica de Catalunya—UPC Barcelonatech, Víctor Balaguer 1, 08800 Vilanova i la Geltrú, Spain
Balduí Blanqué: Grupo de Accionamientos Eléctricos con Conmutación Electrónica GAECE, Department of Electrical Engineering (DEE), Escuela Politécnica Superior de Ingeniería de Vilanova i la Geltrú (EPSEVG), Universitat Politècnica de Catalunya—UPC Barcelonatech, Víctor Balaguer 1, 08800 Vilanova i la Geltrú, Spain

Energies, 2021, vol. 14, issue 21, 1-22

Abstract: This work shows the results obtained from studying the influence of equivalent circuit resistances on three-phase induction motors. The stator resistance, rotor resistance, and iron losses resistance affect the different motor operating variables (output power, current, speed, power factor, starting ratios, and maximum torque). These influences have been quantified, paying particular attention to the losses affected and their impact on efficiency. The study carried out does not apply optimization techniques. It evaluates the different influences of the equivalent circuit’s different resistances on its operation by evaluating applicable constructive modifications concerning available motors. The work has been limited to three-phase induction motors up to 50 kW and low voltage, with the nominal powers of the selected motors being 0.25 kW, 1.5 kW, 7.5 kW, 22 kW, and 45 kW. The tools used to carry out the study are analyzing the equivalent circuit and the simulation of the electromagnetic structure using a finite-element program. The variations proposed in each resistance for all the motors studied is not purely theoretical, as it is based on applying feasible constructive modifications, appropriately analyzed and simulated. These modifications are the variation of the conductor diameter in the stator coils, the change of the section of the rotor cage, and the selection of different ferromagnetic steel types.

Keywords: efficiency improvement; equivalent circuit; induction motor; losses; operating parameters (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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