| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 93 === The advantages of the proposed magnetic suspension vibrator are no friction, no contamination, low noise, rigid and un-flexible. In this thesis, a hybrid magnetic suspension vibrator is presented and implemented. The magnetic suspension vibrator is an unstable system, but by designing a PID controller and some electronic circuits and using a potential meter, the closed loop system will be stable. The experiments of the position control and the vibration suppressed are both verified.
By designing the PID controller, the PWM circuit (duty cycle is 96%) and the full bridge driver circuit, the original periodic disturbance signals are (mm) and (mm) can be suppressed to (mm) and (mm).
In the position control, the best performance for the supporter goes back to the equilibrium point is about 0.3 seconds (the worst performance is about 0.5 seconds). Two permanent magnets (PM1 and PM2) are also able to resist efficiently the external force 0.24(kg), (but not completely, like a mechanical spring we expected). The maximum external force is resisted for the hybrid magnetic suspension vibrator is about 0.82(kg).
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