Adaptive Control for Imbalance Compensation of a Rotor System Supported by Active Magnetic Bearings

• Main Authors: Duan-Liang Weng, 翁端良
• Other Authors: Yi-Hua Fan
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/23501254311519523869

碩士 === 中原大學 === 機械工程研究所 === 93 === Abstract This thesis proposed the controller and estimator design concept and method for the horizontal rotor system suspended by single active magnetic bearing. The electromagnetic force supported by the active magnetic bearing is used to resist the influences of gravity and external forces. The rotor will be controlled to suspend in the pre-calculated position by the feedback PD control and the feed-forward compensator. In axial aspect, the flexible shaft coupling links up the motor and the rotor, thus there are only four degrees of freedoms must be considered. The eddy current sensors are used to provide the position signals, and the PC-based PD controller will catch these signals by the AD/DA card calculate by the software of MATLAB then feed to the rotor system by the real-time control toolbox. The external force estimator is designed at the assumption that the strength-current parameter and strength-displacement parameter is changeless, but these two parameters are in fact have some different quantity along with the current size and the position changes. Thus, the estimated imbalance force and the external force will be inaccuracy. So, we will use the MIT law of the adaptive control to adjust the estimated the external force and use the concept of the N time feed-forward control to feed the compensative signal to the system. From the simulation result, we see that we can estimate the external force and feed- forward to the system in order to dispel the disturbance of the imbalance force by using the compensation of feed-forward,. The result of simulation shows, when the system has not joined the external force of compensation of feed-forward, we can control it near the rotor center to export in the position but skew amount is big. After joining the compensation of feed-forward to the system, it can be effective to restrain the imbalance force and disturbance of external force.