Volume 22, Issue 1 (March 2026)                   IJEEE 2026, 22(1): 3778-3778 | Back to browse issues page

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Razavi M A, Tootoonchian F, Nasiri Gheidari Z. Mitigating the Effects of Rotary Transformer Leakage Flux on Brushless Synchro Accuracy. IJEEE 2026; 22 (1) :3778-3778
URL: http://ijeee.iust.ac.ir/article-1-3778-en.html
Mitigating the Effects of Rotary Transformer Leakage Flux on Brushless Synchro Accuracy
Mohammad Ali Razavi , Farid Tootoonchian , Zahra Nasiri Gheidari
Abstract:   (534 Views)
Synchros are electromagnetic sensors utilized to determine the angular position of a rotating shaft. This paper examines the impact of leakage flux from the Rotary Transformer (RT) on the induced voltages and the position detection accuracy of the Wound-Rotor (WR) synchro. Various methods are proposed to mitigate the negative effects of leakage flux from the RT. The leakage flux paths, which couple with the signal winding, are identified. Based on this analysis, the optimal distance between the sensor and the RT is calculated to minimize the adverse effects of leakage flux on the synchro's accuracy. Additionally, the RT structure is modified to reduce the leakage flux. Another effective approach involves the use of Electromagnetic Interference (EMI) shielding. In this context, a shield frame is designed for the RT, and the impact of different shield materials on reducing leakage flux is investigated. The results show that a copper-based shield significantly reduces the adverse effects of leakage flux and improves the sensor’s accuracy. To evaluate the effectiveness of the proposed methods, they are assessed through 3-D Time-Stepping Finite Element Analysis (3-D TSFEA) and experimental measurements on a prototype sensor. The experimental results show close agreement with the 3-D TSFEA, confirming the accuracy of the findings.
Keywords: Brushless Synchro, Electromagnetic Interference (EMI) Shielding, Leakage Flux, Position Sensors, Rotary Transformer (RT), Time-Stepping Finite Element Analysis (TSFEA).
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Type of Study: Only for Articles of ICEMD2024 | Subject: Special Electric Machines
Received: 2025/02/23 | Revised: 2025/09/02 | Accepted: 2025/07/18
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© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.