Electromechanical interaction in eccentric-rotor cage induction machine equipped with a self-bearing force actuator

Antti Laiho (Corresponding Author), Kari Tammi, Juha Orivuori, Anssi Sinervo, Kai Zenger, Antero Arkkio

    Research output: Contribution to journalArticleScientificpeer-review


    In this paper, flexural rotor vibration in a two-pole cage induction machine equipped with a built-in force actuator is examined. The built-in force actuator is based on the self-bearing machine technology in which a supplementary winding is placed in the machine for force production. The built-in force actuator enables active vibration control, but also it enables excitation of the machine for purposes of condition monitoring, for instance. A low-order parametric model is derived for the actuator-rotor system. In the model, the arbitrary eccentric rotor motion is coupled with the voltage-flux equations for the supplementary winding and eccentric rotor cage. Furthermore, based on frequency-domain system identification, a control method is examined for compensating synchronous rotor vibration. Experimental results are given for a two-pole cage induction motor. The main contribution of the article is to couple eccentric rotor motion, the built-in force actuator and the mechanical rotor model to obtain a low-order parametric model of the actuator-rotor system which can be applied to control design for rotor vibration suppression.
    Original languageEnglish
    Pages (from-to)519-529
    Number of pages11
    JournalJournal of System Design and Dynamics
    Issue number4
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed
    Event11th International Symposium on Magnetic Bearings, ISMB-11 - Nara, Japan
    Duration: 26 Aug 200829 Aug 2008


    • rotor vibration
    • electrical machines
    • magnetic actuator
    • rotordynamics
    • self-bearing machines
    • active control17


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