Application of sliding mode control using reduced order model in induction motor

Under the assumption that the dynamics of an induction motor consist of some partial motions of different rates, two different types of reduced-order system (of first and third orders) are obtained using the method of singular perturbation theory. Correspondingly, a very simple control algorithm based on sliding mode control is designed. In the first case the electromagnetic dynamics is neglected: in the second the processes associated with leakage fluxes are neglected. The motor slip and phase are handled as control actions and designed as discontinuous functions of control error, which is steered to zero by enforcing sliding modes. An experiment setup using analog circuitry for a 4p-induction motor with a power of 0.91 W and a three-phase voltage of 160 V was designed, assembled, and tested