Recent progress in material science has made it possible to economically implement motors with permanent magnet technology in a direct drive system. Particularly synchronous motors with interior permanent magnets benefit from this development. This paper offers a fast and accurate analysis methodology that is suitable for use in an everyday design environment. It uses both the analytical and finite element method (FEM) and is verified by means of a prototype traction motor. From the results, it is concluded that three two-dimensional functions can be used to accurately calculate the performance of permanent magnet motors in an everyday design environment.