Abstract
Due to advantages such as high energy density, high power density, rapid charge and discharge, high cyclic-life, and environmentally friendly, flywheel energy storage systems (FESs) are widely used in various fields. However, the performance of FES systems depends on the performance of a high speed machine, therefore, the design and optimization of a high efficiency and high power density machine are very crucial to improve the performance of the whole FES system. In this paper, a high speed permanent-magnet synchronous machine (PMSM) is researched. Considering the requirement of low torque ripple in low speed and loss caused by back electromotive force (EMF) harmonics, the electromagnetic performance is improved from points of view of slot/pole matching, magnetic-pole embrace with the finite element method (FEM). Furthermore, the magnetic-pole eccentricity, the slot opening, the thickness of PM and air-gap length are also optimized with Taguchi method. The electromagnetic performance, such as torque ripple, cogging torque, average torque and back EMF wave are much improved after optimization. Finally, experiments are carried out to verify the calculated results.
Highlights
With the rapid development of society and the economy, higher requirements are put forward for energy use, which include more reliability, more flexibility, more efficiency, more adaptability to various actual application situations, etc
In a high speed machine, a large pole number will cause high iron losses, so this paper focuses on the selection of slot number considering both torque performance and back electromotive force (EMF) when the pole number has a constant value of four
The corresponding results of torque characteristics and the total harmonics distortions (THD) of back EMF for each combination scheme are calculated with finite element method (FEM) and listed in Table 9; (3) the calculated results in Table 9 are analyzed through analysis of means (ANOM) and analysis of variance (ANOVA) to obtain optimal setting of parameters [54], which will be carried out in the following part
Summary
With the rapid development of society and the economy, higher requirements are put forward for energy use, which include more reliability, more flexibility, more efficiency, more adaptability to various actual application situations, etc. The rotor structure can influence the back EMF and torque performance of a high speed machine. In a high speed machine, a large pole number will cause high iron losses, so this paper focuses on the selection of slot number considering both torque performance and back EMF when the pole number has a constant value of four. Adopting a proper magnetic-pole embrace, cogging torque can reach zero in theory for surface machines and the back EMF harmonics can be decreased.
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