| Summary: | 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.
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