Modelling an AC motor with high accuracy in a wide frequency range

Author

Jia, Kun ; Bohlin, Georg ; Enohnyaket, Mathias ; Thottappillil, Rajeev

Author_Institution

Sch. of Electr. Eng., KTH-R. Inst. of Technol., Stockholm, Sweden

Volume

7

Issue

2

fYear

2013

fDate

Feb. 2013

Firstpage

116

Lastpage

122

Abstract

This study presents a practical method to construct a high-frequency equivalent circuit model for AC motors in Spice-like simulation software. This model can be used to analyse the characteristics of the motor and predict the conducted electromagnetic noise in an adjustable speed drive system. The modelling is based on measured data of the impedance and vector fitting technique. The procedure of the modelling is elaborated in this study and verified by comparing simulated data with experimental data on a 200 kW induction motor in the frequency range from 10 kHz to 10 MHz. This modelling method can be extended to model other types of motors irrespective of the power rating of the motors. Applications of the motor modelling to study common mode voltage in the system and current oscillation in motor winding are presented.

Keywords

current fluctuations; electric impedance; equivalent circuits; induction motors; machine windings; variable speed drives; AC motor modelling; adjustable speed drive system; current oscillation; electromagnetic noise; frequency 10 kHz to 10 MHz; high-frequency equivalent circuit model; impedance; induction motor; motor power rating; motor winding; power 200 kW; vector fitting technique; wide frequency range;

fLanguage

English

Journal_Title

Electric Power Applications, IET

Publisher

iet

ISSN

1751-8660

Type

jour

DOI

10.1049/iet-epa.2012.0127

Filename

6519355