Combining Field Analysis Techniques and Macroscopic Parameter Simulation for Describing the Behaviour of Medium sized Squirrel-Cage Induction Motors Fed with an Arbitrary Voltage

This paper describes how the instantaneous currents and the torque of a squirrel-cage induction motor can be calculated based on finite element calculations. This is achieved in three steps. In a first step, a model for the motor is defined: the motor is described as a number of phases. In a second step, a finite element program is used to for calculating several inductance matrices describing the coupling between the phases described in step one. In a third step, a set of differential equations describing the behaviour of the defined phases is solved using the finite element calculations. The solution gives us the instantaneous flux linked with the different phases. This solution can be then used to calculate the instantaneous currents and torque.