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Performance and Core Loss Validation of Concentrated Winding IPMSM with Different Core Treatment Open Access


Other title
IPMSM, Core loss, Epstein frame test, SRA
Type of item
Degree grantor
University of Alberta
Author or creator
Rahman, Shah A.
Supervisor and department
Knight, Andy (ECE)
Examining committee member and department
Kar, Narayan (Electrical Engineering)
Salmon, John (ECE)
Li, Ryan (ECE)
Knight, Andy (ECE)
Dinavahi, Venkata (ECE)
Department of Electrical and Computer Engineering
Energy Systems
Date accepted
Graduation date
Doctor of Philosophy
Degree level
Designing and selecting the type of electrical machines for hybrid electrical vehicles (HEV) is a particular challenge due to system requirements that include high power and torque densities, low losses, low weight, small installation space and wide speed range with constant power operation. The main objective of this research is to predict the core losses of an interior permanent magnet synchronous machine (IPMSM) in the design stage and verify the losses. The core loss of the machine is affected by the magnetic properties of the core materials. However, even using the same core materials, the magnetic properties such as B-H loop, DC magnetisation and permeability depend on how the core materials were treated. There are two research phases in this project. In the first stage is simulation to estimate and analyze the core losses are carried out. The simulations include design studies and stress analysis of the designed motor. To ensure that the simulations use accurate material data, toroid and Epstein frame tests are conducted quantifying the effect of material properties and assembly methods on magnetic performance. Finite Element (FE) analysis is used to calculate lumped parameter values, which are used to predict the various performance of the IPMSM over wide speed range. Detailed FE models are used to investigate performance at specific operating conditions. The second phase quantifies the core loss and motor performance through experimental tests. Factors affect on machine performances such as core losses at open circuit and loaded conditions. Two identical machines are tested. In the first, the core materials are subject to Stress Relief Annealing (SRA). In the second, the core has not been SRA. Experiments verified that SRA machine gives the higher efficiencies in the rage of 2-7.5% compared with non-SRA machine. However both machines are also investigated for different torque point without applying the field weakening current which gives a comparative study of both machines. The novelty of this work is investigation and verification the harmonic components core losses of the machines from the knowledge of final stage magnetic properties in core materials obtained directly from Epstein frame tester.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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