Use this URL to cite or link to this record in EThOS:
Title: Investigation of novel modular stator permanent magnet machines
Author: Ren, Bo
ISNI:       0000 0004 7431 8628
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2018
Availability of Full Text:
Access from EThOS:
Access from Institution:
This thesis is focused on the novel modular permanent magnet (PM) machines having flux gaps (FGs) in alternate stator teeth. Three research topics are included: 1) the design of multiphase modular PM machines, 2) cogging torque and torque ripple reduction methods for modular PM machines, 3) the manufacturing tolerance of modular PM machines. First of all, the influence of FGs on the multi-phase modular PM machines are summarized and some general rules are established which can be used as the design guidelines for the multiphase modular PM machines. It is worth noting that the 4- and 5-phase modular stator PM machines are only studied through the simulation. Secondly, two cogging torque and torque ripple reduction methods by the slot-opening shift and also the employment of the C-core stator segments are introduced. The proposed methods can effectively reduce the resultant cogging torque and torque ripple of the modular PM machines. Thirdly, the manufacturing tolerances of modular PM machines are also studied in this thesis and it provides an insight into the influence of manufacturing tolerance on the modular PM machines performance. Three possible manufacturing tolerance scenarios, e.g. stator segment radial or circumferential displacement and the PM defects, are investigated. The assessment of the manufacturing tolerance withstand capability of modular PM machines has also been carried out in this thesis. The prototype machines have been built and the numerical results calculated by both 2D and 3D finite element (FE) have been validated. It is worth mentioning that although the research carried out in this thesis based on the small size modular PM machines (for experimental validation purpose), the conclusions obtained in this thesis may be extended to other large modular PM machines.
Supervisor: Li, Guang-Jin ; Zhu, Zi-Qiang Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available