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Presentation of an Integrated Structure for Multi-Turn Resolver

Saneie, Hamid | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 54357 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra
  7. Abstract:
  8. A resolver is a position sensor that converts the angular position information of a mechanical shaft to electrical signals. Due to their machine-like structure, resolvers have been preferred to other position sensors like optical encoders for working in harsh environments with wide temperature variations, high vibrations, moisture, and dust. Besides, the resolution of a resolver is infinite, and it can provide absolute position information. A multi-turn resolver is a type of resolver that has been developed to provide absolute position information with very high precision. Conventional multi-turn resolver consists of two individual resolvers in a common frame. One of them determines incremental position with high accuracy and another one provides absolute position information in the range of 0 to 360 deg. This thesis aims to simplify the structure of multi-turn resolvers by integrating the two individual resolvers. This makes the multi-turn resolver smaller and increases the reliability of the sensor due to the reduced number of components. First, the basic idea of the proposed multi-turn resolver is explained. After that, mathematical analysis is used to verify the operation of the proposed resolver and identify the conditions that ensure the proper operation of the sensor. The initial proposal has complicated windings that, besides the complex winding process, can decrease position accuracy and increase the probability of inter-turn short circuit fault due to the insulation damage. Therefore, a novel approach is presented to facilitate the winding process of the multi-turn resolver. it's shown this method also can be useful in determining non-overlapping winding of conventional single-turn resolvers. The most important output characteristic of a resolver is the accuracy of position estimation or from another point of view the position error. Therefore, it's tried to improve the performance of the proposed resolver in position estimation. A computationally fast and accurate model based on Field Reconstruction Method (FRM) has been presented and used to determine optimal geometrical parameters to reduce position error. The validity of different analyses in the proposal of integrated multi-turn resolver, proposed winding method, and the improved resolvers are evaluated using Finite Element Analysis (FEA) and experimental tests
  9. Keywords:
  10. Position Sensor ; Finite Element Analysis ; Winding ; Multi-Turn Resolver ; Field Reconstruction Method (FRM)

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