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Design, Analysis, and Prototyping of Axial Flux Variable Reluctance Resolver

Saneie, Hamid | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49895 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra
  7. Abstract:
  8. Position sensors are inseparable parts of motion control systems. The variable reluctance resolvers, as position sensors, are widely used in the drive of permanent magnet motors due to their simple and reliable strucutre. One of the most possible installation faults in these sensors is rotor and stator eccentricities that deteriorate the accuracy of the resolver. Therefore, axial flux variable reluctance (AFVR) resolvers have been proposed to decrease the influence of eccentricities on the output accuracy. Hence, optimizing the AFVR resolver structure is necessary for improving its commercial usage. However, its accurate modelling needs three-dimensional (3-D) time stepping finite element analysis (TSFEA) that is computationally expensive and unsuitable for co-usage with optimization algorithms. Therefore, the aim of this thesis is to establish an accurate, yet computationally fast, model suitable for optimal design of axial flux variable reluctance resolvers. The working of the proposed model is based on magnetic equivalent circuit (MEC) and conformal mapping, which are in turn based on Schwarz-Christoffel (S-C) mapping. The model uses conformal mapping to calculate reluctances that are used in magnetic equivalent circuit for calculating magnetic fluxes linkages, inductances and induced voltages. Then, the induced voltages are used for calculating angular position and the THD of voltages’ envelope. In addition, the proposed model is used to optimize the initial design and then, its results are compared with those of 3-D TSFEA. Finally, the experimental prototype is used to evaluate the developed analytical model
  9. Keywords:
  10. Magnetic Equivalent Circuit (MEC) ; Three-Dimensional Finite Element Analysis ; Attitude Sensor ; Axial Flux Variable Reluctance Resolver (AFVR) ; Schwarz-Christoffer (S-C)Mapping

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