Design and Implementation of a Driving Strategy for Star-Connected Active Magnetic Bearings with Application to Sensorless Driving

Romain Brasse, Jonah Vennemann (), Niklas König, Matthias Nienhaus and Emanuele Grasso
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Romain Brasse: Laboratory of Actuation Technology, Saarland University, 66123 Saarbrücken, Germany
Jonah Vennemann: Laboratory of Actuation Technology, Saarland University, 66123 Saarbrücken, Germany
Niklas König: Laboratory of Actuation Technology, Saarland University, 66123 Saarbrücken, Germany
Matthias Nienhaus: Laboratory of Actuation Technology, Saarland University, 66123 Saarbrücken, Germany
Emanuele Grasso: Laboratory of Actuation Technology, Saarland University, 66123 Saarbrücken, Germany

Energies, 2022, vol. 16, issue 1, 1-18

Abstract: For decades, sensorless position estimation methods gained lots of interest from the research community, especially in the field of electric drives and active magnetic bearings (AMBs). In particular, the direct flux control (DFC) technique promises unique advantages over other sensorless techniques, such as a higher bandwidth, but on the other hand, it requires the coils to be connected in a star topology. Until now, star-point connections are rarely found on active magnetic bearings. In consequence, there is no known publication about the application of the DFC to an AMB to this date. In order to apply the DFC to an AMB, a star-point driving approach for AMBs must be developed beforehand. A star-connected driving approach, capable of driving a four-phase AMB, is proposed and validated against traditional H-bridges in a simulation. Further, the strategy is tested in a physical application and generalised for 4 ∗ n phases. In terms of current dynamics, the simulation results can be compared to the well-known full H-bridge driving. The experiments on the physical application show that the actual current in the coils follows a reference with satisfactory accuracy. Moreover, the inductance measurements of the coils show a strong dependency on the rotor’s position, which is crucial for sensorless operation. A star-point connection delivers a satisfying response behaviour in an AMB application, which makes sensorless techniques that require a star point, such as the DFC, applicable to active magnetic bearings.

Keywords: active magnetic bearing; AMB; star connection; star point; direct flux control; DFC; sensorless; anisotropy-based position estimation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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