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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 58925 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Nasiri Gheidari, Zahra
- Abstract:
- Today, high-efficiency inverter-fed electrical machines (such as Permanent-Magnet Machines) are increasingly used in a wide range of industrial applications, vehicles, and servo mechanisms. The performance of these machines strongly depends on the control unit, and particularly on the position sensor. To achieve improved performance and ensure proper electronic commutation, the rotor position must be determined accurately. Compared with other commercial position sensors, such as encoders, selsyns—owing to their electromagnetic structure—provide higher accuracy in harsh industrial and high-vibration environments. Although extensive research has recently been conducted on two-phase selsyns (resolvers), studies on three-phase selsyns (synchros) are still limited. Due to their three-phase structure, synchros offer higher reliability than resolvers. The objective of this project is to design and develop an analytical model for a wound-rotor synchro. The wound-rotor structure is selected because the most accurate two-pole synchros still employ wound rotors along with a rotary transformer. Optimal sensor design requires an accurate prediction of the sensor output. Although the finite-element method provides very high accuracy, it is not well suited to iterative design procedures; therefore, analytical approaches are more appropriate. Accordingly, this research proposes an analytical model to predict the sensor performance with satisfactory accuracy and acceptable computational time. The proposed model is based on the magnetic equivalent circuit method, in which magnetic saturation is taken into account. The developed model is used to optimize the initial design in order to improve sensing accuracy and reduce the effect of leakage flux in the rotary transformer. The performance of the proposed optimized design is successfully validated by three-dimensional finite-element analysis, and a laboratory prototype of the sensor is finally manufactured. The analytical model is validated by comparing its results with those obtained from 3D finite-element simulations and experimental tests. These comparisons demonstrate the desirable accuracy and speed of the proposed analytical model and confirm the correctness of the overall design and optimization procedure
- Keywords:
- Analytical Modeling ; Magnetic Equivalent Circuit (MEC) ; Leakage Flux ; Magnetic Saturation ; Wound-Rotor Synchro ; Rotary Transformer
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