Design on Large Gap Magnetic Suspension Establishment of Model and Controller

• Main Authors: Hon-Da Hsu, 許鴻達
• Other Authors: Chin-E Lin
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/25103911744106850309

碩士 === 國立成功大學 === 航空太空工程學系 === 81 === In a wind tunnel test, the supporting rod will affect the air flowing field. It results in significant turbulence to the test model. This problem can be solved by applying the magnetic suspension technology. The purpose of the thesis is to establish dynamic equation and design a controller on the single pole large gap magnetic suspension system. In the thesis, a measurement system to sense the magnetic field is developed, and the magnetic force model is established. Development of magnetic suspension technology has significantly increased in recent years. The principle to distinguish them is given by the fact whether the magnetic field in air gap is uniform or not. If the fact that the magnetic field in air gap is uniform can be employed, then it is a small gap magnetic suspension system; otherwise it is a large gap. On the tracking problem, two reference inputs and their controllers are introduced respectively. The first reference input is a step reference input. Because magnetic suspension system is an unstable and nonlinear system, we linearize the nonlinear system near the designed operating point and design a PID controller by linear control theory. The second reference input is a sine wave reference input. Because this is a wide range control, the linear control theory has some limitation for a wide range control in nonlinear unstable system. A fuzzy PID controller is used to adjust three parameters adequately of the PID controller. System design, simulation, and test procedure are carried out in this study. Some experimental results are discussed.