Analysis of equivalent inductance of three-phase induction motors in the switching frequency range

Srndovic, Milan (author), Fišer, Rastko (author), Grandi, Gabriele (author)

The equivalent inductance of three-phase induction motors is experimentally investigated in this paper, with particular reference to the frequency range from 1 kHz to 20 kHz, typical for the switching frequency in inverter-fed electrical drives. The equivalent inductance is a basic parameter when determining the inverter-motor current distortion introduced by switching modulation, such as rms of current ripple, peak-to-peak current ripple amplitude, total harmonic distortion (THD), and synthesis of the optimal PWM strategy to minimize the THD itself. In case of squirrel-cage rotors, the experimental evidence shows that the equivalent inductance cannot be considered constant in the frequency range up to 20 kHz, and it considerably differs from the value measured at 50 Hz. This frequency-dependent behaviour can be justified mainly by the skin effect in rotor bars affecting the rotor leakage inductance in the considered frequency range. Experimental results are presented for a set of squirrel-cage induction motors with different rated power and one wound-rotor motor in order to emphasize the aforesaid phenomenon. The measurements were carried out by a three-phase sinusoidal generator with the maximum operating frequency of 5 kHz and a voltage source inverter operating in the six-step mode with the frequency up to 20 kHz.

• Language: English
• Keywords: equivalent inductance, leakage inductance, switching frequency, induction motor, current ripple, current switching ripple, switching frequency modelling
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 10 str.
• Numbering: Vol. 8, iss. 2, art. 120
• PID: 20.500.12556/RUL-131957
• UDC: 621.31
• ISSN on article: 2079-9292
• DOI: 10.3390/electronics8020120
• COBISS.SI-ID: 12339540
• Publication date in RUL: 07.10.2021

Record is a part of a journal

• Title: Electronics
• Shortened title: Electronics
• Publisher: MDPI
• ISSN: 2079-9292
• COBISS.SI-ID: 523068953

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 01.02.2019

Secondary language

• Language: Slovenian
• Keywords: ekvivalentna induktivnost, razsipana induktivnost, stikalna frekvenca, asinhronski motor, valovitost toka