Dynamical Modelling of Passively Levitated Electrodynamic Thrust Self-Bearing Machines
(2018) IEEE Transactions on Industry Applications — Vol. 55, n° 2, p. 1447-1460 (2019)
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- Abstract
- Topologies of electrodynamic thrust bearings (EDTB) and axial flux permanent magnet (AFPM) machines exhibit a significant number of similarities. Starting from this observation, the present paper introduces a new self-bearing motor combining, within a single armature winding and through the same permanent magnets, both the passive electrodynamic axial levitation and motor functions. The rotor axial stabilisation being achieved through passively induced currents, no sensor, controller and power electronics related to the bearing function are required. In addition, an electromechanical model describing both the axial and spin dynamics of such a motor is presented. This set of six equations depends on twelve parameters whose determination can be performed through static finite element simulations or quasi-static experimental measurements. The model is linearised allowing us to study the local stability of this passive self-bearing motor around an operation point characterised by the rotor spin speed as well as the external force and torque. The dynamic and quasi-static behaviours as well as the stable spin speed ranges are analysed through a case study. Finally, a first experimental investigation dedicated to the validation of the operation principle as well as the dynamical model is performed.
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Van Verdeghem, J., Lefebvre, M., Kluyskens, V., & Dehez, B. (2018). Dynamical Modelling of Passively Levitated Electrodynamic Thrust Self-Bearing Machines. IEEE Transactions on Industry Applications, 55(2), 1447-1460. https://doi.org/10.1109/TIA.2018.2880422 (Original work published 2019)