A Self-Bearing 8/6 Switched Reluctance Motor

Aino Manninen, Victor Mukherjee, Jenni Pippuri, Kari Tammi

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    This paper describes a self-bearing 8/6 switched reluctance motor (SRM). The main challenge with such a motor is how to control both torque and radial forces. This task is particularly challenging because the double saliency of the machine type causes the characteristics of the motor to be highly nonlinear. In this paper, we first present a switching logic for the 8 stator coils. The current in the 8 phases is defined by using three current components and the rotor angle. After that, we propose a model that could be used in the closed loop control to solve the required stator currents from needed radial forces and torque. The force and torque models are based on first and second order polynomials, which are fitted to data that have been obtained by two-dimensional electromagnetic finite element analysis. In this paper we compare the performance of the analytical model with the finite element analysis data, and use the analytical model for direct open loop control. The results show that the proposed analytical model can be used to calculate the required stator currents that are needed to operate the self-bearing SRM. The models can be combined with closed loop control methods in order to properly control the machine.
    Original languageEnglish
    Title of host publicationProceedings of ISMB15
    Number of pages8
    Publication statusPublished - 2016
    MoE publication typeNot Eligible
    Event15th International Symposium on Magnetic Bearings, ISMB15 - Kitakyushu, Japan
    Duration: 3 Aug 20166 Aug 2016


    Conference15th International Symposium on Magnetic Bearings, ISMB15
    Abbreviated titleISMB15


    • switched reluctance machines
    • self-bearing machines
    • modelling
    • control
    • finite element method


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