http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Design of Rigid-body-mode Control for Active Magnetic Bearings Using Phase Margin Optimization
M. Noh(노명규),M. Song(송미선),Y.-W. Park(박영우) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Active magnetic bearings are intrinsically unstable, thus requiring feedback control for stable operation. In industry, PID-like control algorithms are widely used because they are intuitive and simple. However, considerable experience and expertise are necessary to tune the control gains adequately. When the speed of rotor is low compared to the flexible modes, the dynamics of rotor can be treated as that of rigid bodies. As long as the system is stable, the stability is related to the phase margin. In this paper, we derive a relation between the control parameters and the phase margin, by considering current amplifiers, sensors, and magnetic actuators. If the bandwidth of current amplifiers is high enough, this relation can be solved analytically. The phase margin can be maximized using this relation, thereby resulting in optimal control gains. This procedure can be used not only for low speed machines, but also for initial control of high speed machines to enable system identification.