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Open AccessArticle

Space Vector Modulation Strategies for Self-Sensing Three-Phase Radial Active Magnetic Bearings

Institute of Energy Systems and Electrical Drives, Technische Universität Wien, Gußhausstr. 25, 1040 Vienna, Austria
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This paper is an extended version of our paper published in: Wimmer, D.; Hutterer, M.; Hofer, M.; Schrödl, M. Variable Space Vector Modulation for Self-Sensing Magnetic Bearings. In Proceedings of the 16th International Symposium on Magnetic Bearings (ISMB16), Beijing, China, 13–17 August 2018.
Actuators 2019, 8(2), 41; https://doi.org/10.3390/act8020041
Received: 19 April 2019 / Revised: 8 May 2019 / Accepted: 10 May 2019 / Published: 14 May 2019
The focus of this study lies on the investigation of the space vector modulation of a self-sensing three-phase radial active magnetic bearing. The determination of the rotor position information is performed by a current slope-based inductance measurement of the actuator coils. Therefore, a special pulse width modulation sequence is applied to the actuator coils by a conventional three-phase inverter. The choice of the modulation type is not unique and provides degrees of freedom for different modulation patterns, which are described in this work. For a self-sensing operation of the bearing, certain constraints of the space vector modulation must be considered. The approach of a variable space vector modulation is investigated to ensure sufficient dynamic in the current control as well as the suitability for a self-sensing operation with an accurate rotor position acquisition. Therefore, different space vector modulation strategies are considered in theory as well as proven in experiments on a radial magnetic bearing prototype. Finally, the performance of the self-sensing space vector modulation method is verified by an external position measurement system. View Full-Text
Keywords: active magnetic bearing; self-sensing; radial three-phase bearing; space vector modulation active magnetic bearing; self-sensing; radial three-phase bearing; space vector modulation
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Wimmer, D.; Hutterer, M.; Hofer, M.; Schrödl, M. Space Vector Modulation Strategies for Self-Sensing Three-Phase Radial Active Magnetic Bearings. Actuators 2019, 8, 41.

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