Abstract
Magnetic levitation systems require multiple displacement sensors. These sensors cause several problems; high sensor cost, interference between adjacent sensors, installation space and non-collocation of sensors and actuators. To overcome these problems, self-sensing technique has been proposed. In this paper, self-sensing control is applied to IPM(Interior Permanent Magnet) type self-bearing motor. The nonlinear outputs of the differential transformer type displacement estimation are analyzed. Then the nonlinear characteristics of differential outputs can be approximated as a bivariate polynomial. A nonlinear compensation method using the bivariate polynomial coefficients identified by least square method is proposed
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