This thesys is about controlling a 3phase synchronous reluctance motor using nonlinear control methods.1st,the the traditional steate feedback controller is presented examined for a 3 phase synrm,neglecting the iron losses.then,it was examined when the perturbation existed.in this examination,1st of all,we neglected all types of perturbation,what so ever.the results were monitored as expectedTthe Drive,followed the position thus speed profile smoothly with the least amount of expected noie.then,the perturbation was inserted,by the sudden change of the Load torque.since this method is parameter dependent,as expected,by the change of the Drive parameters,the motor became unstable an Error was introduced in the position tyraction.the pvactical results were displayed afterwards.since the controller became unstable,it was decided to use a robust controller,such as the traditional SMC.by using the SMC,we see that there is a gain in the controller design it is called the sliding gain.by changing that gain,we see the ripple over the position speed profile inveases.thus,the chattering effect which ruins the motor over the time was introduced.this chattering phenomena,causes the sudden changes or fast changes of torque command,causing pulsation torques on the motor.in pvactice,1st a gain of 0.5 was used.the 1st thing which got our attention was the difference in tracking ripple compared to the traditional state feedback,which was due to the switching phenomena.in the case of the gain of 0.5,the Drive became unstable in presence of perturbation which tell’s that the gain wasn’t large enough.by changing this gain in order to increase the robustness,the chattering the ripples got worse,meanwhile the robustness increased the Drive,stayed stable in presence of perturbation.in order reduce these effects,a new adaptive VSC controller was introduced.this controller doesn’t use a switching characteristic,thus has a very low chattering characteristic.it uses the LIOPANOF law of stability in order to overcome the uncertainties,thus neglecting the switchings cauised by traditional SMC controller.then,IOFL controller was used in order to compensate the electrical perturbations.then a nonlinear robust position tracking controller was presented for the (SynRM) considering the control strategy of maximum torque control (MTC) related to this motor. Ignoring the motor iron losses,in the simulations, the proposed controller was designed based on combination of linear variable structure and adaptive input-output feedback linearization (AIOFL) techniques. At first step, a sliding mode-plus-PI controller is designed for prediction of the stator current reference signal. The proposed position controller is fast response and robust against mechanical parameter uncertainties and load torque disturbance. At Second step, the proposed sliding mode based AIOFL controller estimates the unknown electrical uncertainties without using sign(.) or sat(.) function. Hence, it reduces chattering or steady state error phenomenon. Finally, the effectiveness and feasibility of the proposed controller approaches is demonstrated by computer simulation. The results obtained confirm that the desired position reference command is perfectly tracked in spite of motor parameter uncertainties and load torque disturbance.at last,the foretold schemes were put to practice the results confirmed the results gained by simulations the position profile was followed as expected. Key words:Position control, robust,nonlinear,IOFL,adaptive