Abstract

Electrical machines with eccentrically positioned rotors experience strong unbalanced magnetic pull directed towards the narrowest air gap. This unbalanced force increases the rotor eccentricity and degrades machine performance. Accurate computation and reduction of electromagnetic force are required for controlling electromagnetic vibration, and this can be achieved by employing a bridge-configured winding scheme. This paper presents a two-dimensional bridge configured permanent magnet synchronous machine model to investigates the force compensating strategy under different eccentricity of PMSM. Furthermore, the force components under rotor eccentricity are compared with Bridge ON and Bridge OFF conditions. The connection of bridge points allows the different currents to flow in different coil groups, reducing the unbalanced magnetic pull. The modelling and simulation of PMSM have been done using time-stepping finite element method. The finding indicates that connecting the bridge points can significantly reduce the amplitude of the electromagnetic force components induced by different rotor eccentricities.