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Optimal Design and Performance Analysis of Linear Variable Reluctance Multi-Turn Resolver

Seyed Bouzari, Ali | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55584 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra
  7. Abstract:
  8. Nowadays, with the increasing need of various industries and applications to directly create linear motion, linear resolvers are attracting more attention than ever. Achieving high accuracy as well as measuring absolute position leads to the introduction of a new generation of resolvers, called multi-turn resolvers. Usually, a multi-turn resolver consisted of two individual resolvers in one frame, while using a common core for both resolvers can help to make the multi-turn sensor smaller, cheaper, and lighter. Nevertheless, the studies conducted on linear and multi-turn resolvers are very limited. Therefore, this research proposes an integrated core linear variable reluctance multi-turn resolver. In the following, an analytical model based on the magnetic equivalent circuit is presented to predict the performance of the proposed resolver, considering the longitudinal end effect. This model, in which the Schwarz-Christoffel mapping is used, requires much less simulation time in comparison with that of Finite Element Method while keeps high accuracy. Therefore, the proposed model can be employed in iterative processes. For this purpose, the time required to execute the model is reduced as much as possible. Then, the model is used to optimize the dimensions of the proposed resolver and compensate for the longitudinal end effect by changing the number of turns of the signal coils. Finally, the prototype of the proposed linear multi-turn resolver is built and experimentally tested. The results of the practical test confirm the success of the optimal design and the presented analytical model
  9. Keywords:
  10. Linear Resolver ; Multi-Turn Resolver ; Analytical Modeling ; Magnetic Equivalent Circuit (MEC) ; Schwarz-Christoffer (S-C)Mapping ; Variable Reluctance Tubular Resolver ; Longitudinal End Effect Compensation

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