Robust Design Optimization Considering Static Eccentricity Fault of Six-Phase IPMSM

Abstract

Static eccentricity fault (SEF) primarily occurs due to external mechanical shocks and incorrect manufacturing processes. In the case of SEF condition, vibration and noise in the electric motor are generated due to unbalanced magnetic forces. Additionally, SEF conditions lead to an increase in the iron loss of motor due to the unbalanced air gap flux density. As iron loss increases, the temperature of the main part of the motor increases, which has a negative effect. Therefore, this paper presents a robust design optimization model where the characteristics of a six-phase interior permanent magnet synchronous motor (IPMSM) do not change drastically even when SEF occurs. First, magnetic flux density, iron loss, and efficiency according to the rotor shape are analyzed using the finite element method (FEM). Second, under identical stator structure conditions, characteristics derived from the finite element method (FEM) are verified through experiments analyzing different rotor shapes. Finally, robust design optimization is performed to ensure that the motor characteristics do not change drastically even when SEF occurs.

Keywords

• Interior permanent magnet synchronous motor (IPMSM)
• iron loss
• robust design
• optimization
• static eccentricity fault (SEF)