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A method is presented for tooltip tracking in active magnetic bearing (AMB) spindle applications. The proposed tool tracking approach uses control of the AMB air gap to achieve the desired tool position. A μ-synthesis-based controller is designed for the AMBs with the goal of robustly minimizing the difference between the tool reference and estimated tool position. In such a way, the model-based control...
The hybrid system approach is used to minimize losses in the AMB system by switching controllers and bias current. The method is validated with experimental results at steady state and rotating system. With high bias orbits of the rotor are reduced while in the absence of disturbance the losses are minimized with low bias. The switching rules based on inner variables of the control system are proposed.
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