Compensation of tool axis misalignment in active magnetic bearing spindle system |
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Authors: | Chong-Won Lee Yeo-Kwon Yoon Ho-Seop Jeong |
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Affiliation: | (1) Center for Noise and Vibration Control, Department of Meachanical Engineering, KAIST, Science Town, 305-701 Taejon, KOREA;(2) Central Research Institute, Samsung Heavy Industry, Science Town, P. O. Box 43, 305-600 Taejon, KOREA;(3) Research & Development Center, Samsung Electro-Mechanics, 314 Maetan 3 Dong Paldal Ku, 441-743 Suwon Si, Kyungki Do, KOREA |
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Abstract: | The tool axis misalignment, which causes machining inaccuracies in an active magnetic bearing (AMB)-spindle system, can be compensated by tracking control of the rotor-spindle. The pseudo-derivative feedback (PDF) control scheme alone does not correct the tool axis misalignment since the integral action results in the narrow bandwidth and large phase lag in the controlled system. To improve the tracking performance, the feedback and feedforward controllers are combined with the existing proportional-derivative controller, which stabilizes the inherently unstable AMB-spindle system dynamics. The theoretical and experimental results show that proposed control scheme efficiently compensates the tool axis misalignment compared with the conventional PDF control scheme. |
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Keywords: | Active Magnetic Bearings Misalignment Pseudo-Derivative Feedback Controller Feedforward Control |
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