Fractional Identification of Rotor Skin Effect in Induction Machines
Fractional identification of rotor skin effect in induction
machines is presented in this paper. Park transformation is used
to obtain a system of differential equations which allows to
include the skin effect in the rotor bars of asynchronous
machines. A transfer function with a fractional derivative order
has been selected to represent the admittance of the bar by the
help of a non integer integrator which is approximated by a J+1
dimensional modal system. The machine parameters are
estimated by an output-error technique using a non linear
iterative optimization algorithm. Numerical simulations and
experimental results show the performance of the modal
approach for modeling and identification.
Keywords: Induction machines, Park transformation, skin effect, fractional impedance, ladder network, non integer order differentiation, output error identification.
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