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Title: Investigation of partitioned stator permanent magnet linear machines
Author: Al-Lami, Ahlam
ISNI:       0000 0004 6056 7500
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2017
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Three novel types of permanent magnet linear machines have been investigated in this thesis, viz. partitioned stator flux reversal permanent magnet (PS-FRPM) planar machine, partitioned stator permanent magnet (PS-PM) tubular machines and partitioned stator single phase short stroke permanent magnet (PS-SPSSPM) tubular machines. PS-PM machines are distinguished by having two active stators and one passive mover. Such configurations offer better inner space utilization as well as enhanced electrical and magnetic loadings. A novel PS-FRPM linear machine is introduced by adopting the idea of PS-PM machine. The machine structure and operation principle are described. In addition, the force production mechanism of the proposed machine is analysed. Furthermore, the machine performance in terms of open circuit and load characteristics, losses and demagnetization withstand capability are investigated. To validate finite element predicted results, a prototype is manufactured and tested. Linear machine with tubular configuration is of great interest in terms of no end winding effect and no net attractive force between the stator and the mover. PS-PM tubular machines, i.e. PS-SPM and PS-IPM are designed and optimized for maximum thrust force capability. Moreover, the influence of the major design parameters on the machine thrust force is investigated. A comparison between both PS-PM tubular machines is carried out. Furthermore, PS-PM tubular machines having single-layer winding configuration are designed and compared to that with double-layer winding configuration counterparts. It is found that better performance can be delivered by single-layer winding PS-PM tubular machines. The interest of single phase short stroke permanent magnet tubular machines (SPSSPMTMs) is considerably increased over last few years, and they have been employed in healthcare, wave energy extraction, and household appliance. Novel PS-SPSS-PMTMs, named as PS-SPSS-SPMTM and PS-SPSS-IPMTM, are investigated. The optimized machine performances are analysed and compared. It is shown that the machines have the advantages of light mover mass and low eddy current loss. Finally, comparisons between the proposed machines and their conventional counterparts are carried out. It is found that the proposed PS-FRPM linear and PS-PM tubular machines exhibit higher thrust force density, better PM utilization, lower magnet eddy current loss and better demagnetization withstand capability compared to their conventional counterparts, i.e. FRPM, SFPM linear machines and SFPM tubular machine, respectively.
Supervisor: Zhu, Z. Q. ; Li, Guang Jin Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available