Harmonic rotor vibration with control in a cage induction machine

Antti Laiho, Kari Tammi, Antero Arkkio

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    In electrical machines, various harmonic forces of both mechanical and electromagnetic origin are acting on the machine rotor. Typically, the main forces of the mechanical origin are mass unbalance forces synchronous with the rotor rotation frequency and its multiples and sub-multiples. Forces of the electromagnetic origin are induced by rotating magnetic fields in the air-gap between the stator and rotor of the machine. The fields may be originated, for instance, from the stator or rotor slotting (higher harmonics), eccentric rotor motion, saturation of magnetic materials or unipolar flux (two-pole machines). The harmonic forces exerted on the rotor may induce flexural rotor vibration with increased bearing wear. In its extreme, the flexural rotor bending modes may couple with the electromechanical system and induce rotordynamic instability. In this paper, flexural rotor vibration is considered in a two-pole cage induction machine equipped with a built-in force actuator. Previously, such a construction has mainly been used for rotor levitation in self-bearing machines. An analytical model for actuator-rotor system with flexural rotor vibration is considered. By using the force actuator, a special emphasize is put on control of the rotor rotation harmonic vibration components. Analytical formulations with experimental results by using a 30 kW two-pole cage induction machine are provided.
    Original languageEnglish
    Title of host publicationProceedings of the 16th International Congress on Sound and Vibration, ICSV16
    Place of PublicationKraków
    ISBN (Electronic) 9788360716717
    Publication statusPublished - 2009
    MoE publication typeA4 Article in a conference publication
    Event16th International Congress on Sound and Vibration, ICSV16 - Krakow, Poland
    Duration: 5 Jul 20099 Jul 2009


    Conference16th International Congress on Sound and Vibration, ICSV16
    Abbreviated titleICSV16


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