A high power permanent magnet synchronous motor has been investigated and numerically simulated using finite element method (FEM) with the aid of ANSYS software (RMXPRT and Maxwell 2D/3D). Concerning the design factors of the slot opening and the skew of the permanent magnets to as main effective role for main minimizing the phenomena of cogging torque. In this paper, the effect of the two factors are considered to improve the dynamic performance of IPMSM. For presenting and simulation the skewing of rotor magnets, it is more convenient to use 3-D FEM model than. The RMxprt software has been used for modeling and simulating the synchronous motor and calculating the values of cogging torque and the working torque at steady state condition. Then the model, based on RMxprt software, has been transferred to Maxwell 3-D software for computing the distribution of magnetic field and explaining the performance under steady-state operation. The obtained results show important reduction of cogging torque due to the effect of applying the slot opening and the skew of the permanent magnets approaches.