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Derating of Squirrel-Cage Induction Motor Due to Rotating Harmonics in Power Voltage Supply

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  • Tomasz Drabek

    (Faculty of Electrical Engineering, Automatics, Computer Science, and Biomedical Engineering, AGH University of Science and Technology, 30-059 Cracow, Poland)

Abstract

This paper presents a method for determining the load capacity of three-phase squirrel-cage induction motors supplied with a balanced distorted voltage containing rotating harmonics (1st, 5th, 7th, 11th, 13th,...). The method is based on the dependence of the motor load capacity on the load power losses in the rotor cage. The load capacity was determined based on motor short-circuit measurements made for frequencies equal to harmonic frequencies. To evaluate the load capacity, a factor with the proposed name Harmonic Losses Factor (HLF) was introduced. Its expression is a generalization of the well-known HVF expression. However, it has been shown that a more accurate estimation of the load capacity is obtained using the sum of load power losses in the rotor cage from higher harmonics. Measurements and calculations were carried out for a low-voltage squirrel-cage motor with a rated power of 22 kW and a synchronous speed of 1500 rpm. Calculations showed that the derating power curves given in the IEC 60034-17 and NEMA MG1 standards are incorrect for the tested motor.

Suggested Citation

  • Tomasz Drabek, 2023. "Derating of Squirrel-Cage Induction Motor Due to Rotating Harmonics in Power Voltage Supply," Energies, MDPI, vol. 16(2), pages 1-24, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:735-:d:1028975
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    Citations

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    Cited by:

    1. Tomasz Drabek, 2023. "Derating of Squirrel-Cage Induction Motors Due to High Harmonics in Supply Voltage," Energies, MDPI, vol. 16(18), pages 1-16, September.
    2. Halil Gör, 2024. "Feasibility of Six Metaheuristic Solutions for Estimating Induction Motor Reactance," Mathematics, MDPI, vol. 12(3), pages 1-43, February.

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