Simple and Accurate Modelling of Surface Mounted PM Machines Including Saturation Effects

Aim of this work is to present a simple but accurate model, which includes saturation, dedicated to surface mounted PM machines. The model will be derived as an extension of the classical q,d axes, synchronous reference frame equations. Its simplicity will allow it to be used for precise drive performance evaluation and possibly also inside real time controllers. In order to demonstrate the capabilities of the model, the property of following the maximum torque vs. current trajectory in presence of saturation will be investigated for an axial flux PM machine.