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Determining the Optimal Excitation Signal in order to Performance Improvement of Resolver

Farhadi Beyranvand, Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52516 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra; Tootoonchian, Farid
  7. Abstract:
  8. The need for position sensors has increased substantially with the development of electric vehicle motion control systems. In industrial applications, encoders are commonly used for positioning, but in polluted industrial environments, with large temperature variation and vibration, the resolver is preferred to optical encoder. Resolver is a two-phase synchronous generator with a high frequency AC excitation voltage instead of DC voltage. Therefore, the output voltages of the resolver are amplitude modulated (AM) voltages which in order to determine the output position, it is necessary to extract the envelope of these signals using R/D converter. In envelope extraction methods, to ensure sampling accuracy, the resolver excitation signal is usually generated by the microp rocessor, which increases the load of microprocessor. However, the use of an external circuit to generate the excitation signal reduces the load of these calculations; but itself has some problems. One of them is the influence of noise on output’s envelope quality. In addition, under these conditions, the microprocessor will not be able to precisely control the sampling process. Therefore, in this thesis, it is attempted to determine the excitation signal so that its computational load for the R/D converter is minimized and at the same time, the performance characteristics of the resolver are not affected. For this purpose, the effects of different sine, triangular, and square excitations on the accuracy of the resolver are examined, and then the optimal excitation signal is determined, with the aim of ease of implementation and achieving minimum positional error. Necessary analyzes are performed using the 3D finite element method and their compatibility with the results of the practical test on a commercial resolver demonstrates their accuracy
  9. Keywords:
  10. Position Sensor ; Resolvers ; Three Dimensional Finite Element Method ; Excitation Signal ; Resolver to Digital Converter ; Wound-Rotor Resolver

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