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This paper presents a new induction motor model specifically developed for simulating self-sensored variable speed drives which employ signal injection based sensorless control techniques. The model is to be used to investigate improved filtering algorithms and closed loop speed controllers. The model employs a simple state space equivalent circuit based model of the induction machine, which is enhanced to include rotor slotting and main flux saturation effects. The improvement is obtained by including a variation of machine inductances variation with the rotor position and the flux position. The new model is verified against experimental results.