Русская версия English version

Estimation of external electromagnetic interference energy of frequency-regulated asynchronous motors

Y. Kazakov, E. Shumilov, A. Tamyarov, A. Morozov

Vestnik IGEU, 2017 issue 4, pp. 37—43

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Abstract in English: 

Background: Frequency-controlled asynchronous motors fed by frequency converters with pulse width modulation are sources of high-frequency external electromagnetic fields and interference that affect the equipment and maintenance personnel, and cause electromagnetic compatibility problems. The level of magnetic fields and noise at a given frequency should not exceed the permissible values. The existing computational methods cannot be used to determine external electromagnetic fields and the noise energy of induction motors with non-sinusoidal supply voltage. It is necessary to estimate the energy of external electromagnetic disturbances of frequency-controlled asynchronous motors at different carrier frequencies of frequency converters.

Materials and methods: The decomposition of the voltage curve shape into time harmonics is performed using the Fourier series. The current harmonics are calculated based on the replacement schemes for the asynchronous motor taking into account the change in impedances with the change in the harmonics frequency. The modeling of electromagnetic fields under the action of current harmonic spectrum is performed by the finite element method. The calculations of the energy of external electromagnetic disturbances of frequency-controlled asynchronous motors are made using the electromagnetic field calculation results.

Results: The developed technique for estimating the influence of supply voltage non-sinusoidality on the energy of external electromagnetic disturbances of frequency-controlled asynchronous motors takes into account the voltage pulse width modulation at different carrier frequencies of the converter and the spectrum of the time harmonics of the electromagnetic fields. It also allows us to determine the values ​​of energy of electromagnetic interference and induction of external electromagnetic fields of frequency-controlled asynchronous motors of different power fed by a frequency converter with pulse width modulation of voltage with different converter carrier frequency values. It has been confirmed that high-frequency components of external electromagnetic fields of frequency-adjustable AD using pulse width modulation frequency converters expand the effect frequency range, and increase the induction of external electromagnetic fields to 13.5% and the energy of electromagnetic interference to 10%, in comparison with the sinusoidal supply voltage. This has a negative effect on electromagnetic compatibility of magnet-sensitive devices and on the staff.

Conclusions: With the increase in the carrier frequency of the PWM inverter, the resulting induction of external electromagnetic fields and the energy of the electromagnetic disturbances of the frequency-adjustable ADs decreases and approaches the values of the power supply with sinusoidal voltage. The developed method allows evaluating external electromagnetic fields of frequency-regulated asynchronous motors and determining their effect on electromagnetic compatibility of magnet-sensitive devices and the staff.

References in English: 

1. Asadullin, A.I., Belashov, V.Yu. Issledovanie EM poley, generiruemykh elektrooborudovaniem i elementami EES [A study of electromagnetic fields generated by electric equipment and electric power systems]. Izvestiya vuzov. Problemy energetiki, 2011, no. 11/12, pp. 98–105.

2. Ovsyannikov, A.G., Borisov, R.K. Elektromagnitnaya sovmestimost' v elektroenergetike [Electromagnetic compatibility in electric power engineering]. Novosibirsk, Izdatel'stvo NGTU, 2010. 196 p.

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6. Malkov, N.A., Pudovkin, A.P. Elektromagnitnaya sovmestimost' radioelektronnykh sredstv [Electromagnetic compatibility of radioelectronic devices]. Tambov, Izdatel'stvo Tambovskogo gosudarstvennogo tekhnicheskogo universiteta, 2007. 88 p.

7. Zyryanov, V.M., Mitrofanov, N.A., Sokolovskiy, Yu.B. Analiz garmonicheskogo sostava napryazheniya chastotnogo elektroprivoda [Analysis of harmonic composition of variable-frequency electric drive voltage]. Nauchnye problemy transporta Sibiri i Dal'nego Vostoka, 2015, no. 1, pp. 154–159.

8. Kazakov, Yu.B., Tamyarov, A.V., Shumilov, E.A., Chuyanov, D.O. Chislennyy analiz vneshnikh elektromagnitnykh poley asinkhronnykh dvigateley pri pitanii shirotno-impul'sno-modulirovannym napryazheniem [Calculation analysis of externalel ectromagnetic fields of asynchronous drives fed by PMW voltage]. Vestnik IGEU, 2011, issue 5, pp. 34–37.

Ключевые слова на русском языке: 
частотно-регулируемый асинхронный двигатель, несинусоидальное питающее напряжение, гармонический анализ, внешние магнитные поля, энергия электромагнитных помех, конечно-элементное моделирование
Ключевые слова на английском языке: 
frequency-controlled asynchronous motor, non-sinusoidal supply voltage, harmonic analysis, external magnetic fields, electromagnetic interference energy, finite element simulation
The DOI index: 
10.17588/2072-2672.2017.4.037-043
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