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
