Sliding Mode Sensorless Control of unsymmetrical Multi Phase Induction Machine

This paper proposes a new scheme for mechanical sensorless control of six phase induction motor under fault condition. The motor has two sets of three-phase windings, spatially phase shifted by 60 electrical degrees which one phase of motor is cut off. This sliding mode observer used, is composed of three other observers: current, flux, and speed observers. The estimated currents in the current observer are used in the flux estimation block, and the rotor speed is estimated using estimated currents and flux. It will be shown by the simulation results that the method controls speed accurately.)

Keywords:

sliding mode , vector control , multiphase drive , induction machine