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

• Author / Creator

  Rahman, Shah A.

• 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.

• Subjects / Keywords

  • IPMSM
  • Core loss
  • Epstein frame test
  • SRA

• Graduation date

  Fall 2014

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R34686

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.