On Unintentional Demagnetization Effect of Switched Flux Hybrid Magnet Memory Machine

World Electric Vehicle Journal

卷:13

Wei Zhang¹  Jingjing Feng¹  Hui Yang²  Yongsheng Ge² 

[1] Department and Electrical and Electronic Engineering, Suzhou College of Information Technology, Suzhou 215200, China;

[2] School of Electrical Engineering, Southeast University, Nanjing 210096, China;

关键词: hybrid magnet;    frozen permeability method;    memory machine;    permanent magnet (PM);    unintentional demagnetization (UD);    switched flux;   

DOI  :  10.3390/wevj13040066

来源: DOAJ

【 摘 要 】

This paper investigates the unintentional demagnetization (UD) characteristics of low-coercive-force (LCF) permanent magnets (PMs), in switched flux hybrid magnet memory machines (SF-HMMMs). Although the LCF PM field is magnetically in parallel to the magnetic fields produced by the NdFeB PM, as well as the armature reaction in the investigated machines, the UD phenomenon of LCF PMs still possibly occurs, particularly, under on-load operation due to the magnetic saturation effect. First, the UD effect is revealed by the frozen permeability method (FPM), and analytically explained via a magnetic circuit model. Various UD types are then identified with the finite-element (FE) method, coupled with a virtual linear hysteresis curve (VLHC) of LCF PM and FPM. In addition, the dimension and grade of the LCF PM are designed with the aid of VLHC, in order to prevent the UD effect. Finally, a fabricated SF-HMMM prototype is tested to verify the theoretical analyses.

【 授权许可】

Unknown