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Position Error of Resolver in a Closed Loop Control

Khajueezadeh Ravari, Mohammad Sadegh | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54405 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra
  7. Abstract:
  8. Permanent Magnet Synchronous Motors (PMSMs) are more conventional and widely employed in Electric Vehicles (EVs) applications. The rotor position performed an essential role through PMSMs drive; therefore, any deviation in the detected position will be evaded in coordinate transformations, originating from external or inherence sources. Subsequently, the discussed faults will be conducted to three-phase currents and output torque through erroneous transformations. Resolver’s estimated rotor position due to fault occurrence will be defined as aggregating ideal and non-ideal components. Moreover, based on inherence periodic in resolvers’ principle, non-ideal components could be written by the Fourier series as a collection of injected harmonics. So, following fault occurrence, undesired harmonics will intensify and emerge in three-phase currents and output torque. The mentioned harmonics’ influence has appeared as amplitude unbalances and fluctuation in current and torque, respectively. Therefore, resolvers’ fault investigation is vital through closed-loop control. Amongst analogous position sensors, due to non-degradation performance in contaminated environments by noise and vibration, it will be adequate in Electric Vehicles (EVs) applications. Nevertheless, its examination in integrating by closed-loop control was so excluded.On the other hand, due to analogous structural and principal between resolvers and electrical machines, the importance of mentioned investigation will be multiplied. Hence, in the following research, fault influence investigation is accomplished comprehensively by neglecting its variety in resolver through closed-loop control. Firstly, due to the limitation of analogous analysis methods in the intended examination, a hybrid reference model was developed due to resolvers’ performance evaluations with closed-loop integration capability. Its accuracy and low computational load were verified by Finite Element Analysis (FEA) and experimental measurements. Ultimately, the resolver faults effect was examined in closed-loop control
  9. Keywords:
  10. Eccentricity ; Static Eccentricity ; Dynamic Eccentricity ; Close Loop Control ; Position Error ; Mixed Eccentricity ; Hybrid Resolver Model

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