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Design and analysis of novel multitooth switched flux permanent magnet memory machine
Published:2019-10-22 author:LIU Yanyan, LIU Xu, ZHANG Chenguang, et al Browse: 2551 Check PDF documents
Design and analysis of novel multitooth switched  flux permanent magnet memory machine
LIU Yanyan1,2,3, LIU Xu1,2,3, ZHANG Chenguang1,2,3, SUN Chaoyong1,2,3
(1.State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Tianjin 300130, China;2.Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Tianjin  300130, China; 3.School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China)


Abstract: Aiming at the problem of low efficiency of conventional multitooth switched flux permanent magnet machine in flux weakening region, a novel multitooth switched flux permanent magnet memory (MSFPMM) machine was developed. In the MSFPMM machine, the online magnetization and demagnetization can be achieved by using the permanent magnets with low coercive force. Thus, the airgap flux density can be reduced by changing the magnetization state of low coercive force permanent magnet with current pulse in the DC field winding. The performance such as the airgap flux density, backEMF, torquespeed characteristics and efficiency in the MSFPMM machine with different magnetization states was investigated by finite element analysis. A prototype MSFPMM machine was built to verify the machine performance. The results indicate that in the MSFPMM machine the efficiency in high speed and low torque region increases when the airgap flux density is reduced. Furthermore, the MSFPMM machine exhibits higher efficiency in flux weakening region compared with the conventional multitooth switched flux permanent magnet machine.
Key words: multitooth switched flux permanent magnet memory（MSFPMM） machine; memory machine; efficiency
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