DYNAMICS AND STABILITY OF MAGNETIC SUSPENSION SYSTEMS USING TUNED LC CIRCUIT

To date, practical dynamic model of magnetic suspension systems using tuned LC circuits has not been established. This paper develops a tran sfer function model for such systems by linearizing system equations n ear the equilibrium state. This model not only nicely explains the inh erent dynamic instability, but also provides a theoretical basis for a nalyzing and synthesizing system dynamic behaviors. A new dynamic stab ilization method is also proposed. This method applies damping to the movable ''stator'' rather than to the suspended object directly, and c onsequently stable suspension without any mechanical contact is achiev ed. Experimental results are shown to confirm the theoretical analysis .