SIMPLE ANALYTICAL MODELS FOR PERMANENT-MAGNET SYNCHRONOUS MACHINES

Simple analytical models are derived for the no-load field, the armatu re field, the main inductance, and the torque of a permanent magnet sy nchronous machine. The solutions are obtained by a one-dimensional car tesian and polar as well as a two-dimensional polar coordinate treatme nt yielding mainly closed analytical expressions. The torque is calcul ated via Lorentz forces on the stator, or directly at the radial magne t edges on the rotor, allowing also the determination of the non-sinus oidal no-load held.