Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Control Boost of an Active Magnetic Bearing System with DOBs

Yupeng Zheng1 and Hyeong-Joon Ahn2,a

1Department of Mechanical Engineering, Graduate school, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul 06978, Korea

2School of Mechanical Engineering, Soongsil University, 369 Sando-ro, Dongjak-gu, Seoul 06978, Korea


Active magnetic bearing (AMB) spindle with variable-speed derives were verified to have notable improvement in terms of not only energy and cost saving but also size and noise. Digital, internally controlled, magnetic bearings reduce friction and eliminate the need for oil lubrication while a variable speed drive on the motor allows the spindle to operate much more efficiently at partial loads. However, AMB is often subject to disturbances in the form of synchronous vibrations due to unmodeled dynamics such as the rotor mass-imbalance and centrifugal forces. This paper presents control boost of an active magnetic bearing with disturbance observer (DOB). Although the DOB is one of the most popular robust control tools due to its simplicity, flexibility and efficiency, AMB industry still relies heavily relies on the conventional PID control. In this study, the DOBs are applied to current and position control of an active magnetic bearing system and verified to have the control boost in terms of stability and robustness.

Keywords: Active magnetic bearing, Control boost, Disturbance observer.

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