state space model of AC servo motor/PMSM motor

my project is to control the position of AC servo motor by sliding mode control so i want the mathematical model of AC servo/PMSM motor(3-phase) i m facing diffculty while generating the mathematical model actually i want to simulate the model in SIMULINK/MATLAB for that i required the [A][B][C][D] matrix or transfer function if any body already work on the same motor or any link regarding the same kindly send memy project is to control the position of AC servo motor by sliding mode control so i want the mathematical model of AC servo/PMSM motor(3-phase) i m facing diffculty while generating the mathematical model actually i want to simulate the model in SIMULINK/MATLAB for that i required the [A][B][C][D] matrix or transfer function if any body already work on the same motor or any link regarding the same kindly send me