Inductance Based Lumped Parameter IPM Machine Model for Fast Simulation

In this paper a fast simulation lumped-parameters motor model was developed for Interior Permanent Magnet motors. The model is based on the Ld and Lq inductance maps and permanent magnet flux derived from 2D FEA with frozen permeability method. It allows to obtain a simple and efficient machine model which can simulate the motor including the saturation, cross saturation and iron losses effects. The model relays only on apparent inductances so there is no need of additional simulations to evaluate the leakage inductance or differential inductances. In addition a representation of the iron losses is included in the model based on an equivalent resistor pt in series in each phase. This allows a better estimation of the voltage drop and the currents dynamic behaviour during the machine working cycle especially at high speed. This fast simulation model allows to obtain an accurate dynamic simulation of the motor coupled with the inverter, control loops and the load.