International Journal of Applied Electromagnetics and Mechanics - Volume 63, issue 2

Authors: Liu, Yapi | Shi, Kaiming | Shi, Kaixiang | Zhou, Hanfeng | Shi, Kang

Article Type: Research Article

Abstract: Stainless steels are an important class of alloys, and are already used in a broad range of applications, especially used as electronic information materials. To take advantage of their magnetic characteristics, many fundamental magnetic problems involving stainless steels must be further studied. In this paper, magnetic measuring of ferrite stainless steels are conducted using the ring samples and bar samples in different magnetic fields, which are both frequently used in industry for quality control. From the magnetic parameters obtained from the major loops of both samples, such as Br, Hc, 𝜇r , Js and H 𝜇max , large …differences were found, revealing that, in ferrite stainless steel two kinds of samples can get quite a different result. The reasons are discussed. Furthermore, the benefits of both kinds of samples are discussed in terms of sample dimensions, anisotropy, demagnetization field, and inclusions. Moreover, the typical magnetic data obtained from the major and minor hysteresis loops are also discussed. Show more

Keywords: Stainless steel, ferrite stainless steel, magnetic property, magnetic anisotropy, magnetic measuring

DOI: 10.3233/JAE-190036

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 2, pp. 361-374, 2020

Authors: Huang, Jinlin | Wang, Chen

Article Type: Research Article

Abstract: This paper investigates the opportunity to use a proper geometry of Line start permanent-magnet synchronous motor (LSPMSM) that allows the same stator to be used for three different rotor structures, namely, typical, solid rotor and strange rotor. The air-gap flux density, back electromotive force (EMF), cogging torque, efficiency, starting performance and synchronization capability of the three machines are analyzed and compared. It is demonstrated that the typical rotor has the highest air-gap flux density, and the strange rotor has the lowest cogging torque and highest starting torque. In addition, the solid rotor has the lowest total harmonic distortion (THD), the …highest efficiency, and the lowest cost. The size of PM and rotor structure are optimized to maximize the starting torque and efficiency of the solid rotor LSPMSM based on response surface method (RSM). Finally, the solid rotor LSPMSM is prototyped to verify the results of the finite element analysis. Show more

Keywords: Finite element analysis, LSPMSM, rotor structure; starting performance

DOI: 10.3233/JAE-190093

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 2, pp. 375-390, 2020