This paper proposes a methodology for optimal design of Permanent Magnet assisted Synchronous Reluctance Motor. The magnetic model is explained because the particularities associated to high magnetic saturation regions this motor has, which lead to difficulties in inductance calculation. Hence, the finite element analysis is currently used to design and optimize Permanent Magnet assisted Synchronous Reluctance Motor, from the first. This method requires a high amount of computational time and resources. For this reason, the magnetic model explained in this paper is a good alternative to introduce on optimal design process. The magnetic model proposed is based on reluctance network and takes into account the magnet effects and the possibility of structural ribs on motor design.