Electromagnetic–Mechanical Coupling Optimization of an IPM Synchronous Machine with Multi Flux Barriers

Abstract

In this paper, an interior permanent magnet (IPM) synchronous machine with multiflux barriers is proposed to meet the wide speed regulation application requirements of electric vehicles. Based on the flux barrier characteristic, an electromagnetic–mechanical coupling optimization strategy is employed for the machine design. In order to facilitate the optimization design, the rotor barriers are divided into two optimization zones, the maximum stress zone and the maximum deformation zone. The electromagnetic–mechanical coupling optimization strategy is divided into two stages accordingly. In the first stage, the machine is regarded as a synchronous reluctance machine by ignoring permanent magnets, where the dimensions of the arc-shaped barriers are optimized to achieve a large reluctance torque and small stress. In the second stage, the dimensions of the arc-shaped PMs and the elliptical barrier are optimized with three objectives of minimum torque ripple, minimum flux linkage, and minimum deformation. After machine optimization, the comparison investigations are carried out on the basis of finite-element analysis by considering both the electromagnetic performances and mechanical performances.

Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

“…Finite element analysis has been proposed to avoid nonlinear contact simulation while estimating rotor stress [8]. Electro-mechanical coupled optimization can be used to optimize the geometry of an interior permanent magnet (IPM) synchronous machine with multi-flux barriers [9]. Experimental validation of the rotor finite element model has been carried out by comparing the simulation and experimental rotor deformation for an IPMSM and an induction motor [10].…”

A comparison between conventional and flux‐intensifying interior permanent magnet synchronous machines

“…For more decreasing of L q , multilayer flux barriers are inserted long q ‐axis flux path. 11,12 In Reference 11, inserting multi‐flux barriers is optimized to improve the electromagnetic performances and mechanical performances of IPMSMs for electric vehicle applications. In Reference 12, internal and external flux barriers are inserted to improve back EMF sinusoidal shape, flux weakening capability, and anti‐demagnetization capability.…”