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2026-05-04 Latest Published

Design and Experiment of Compact Rotary MCR-WPT Coils at MHz Band
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By Kunming Chen Yanhong Li Caiyun Dai Guo-Qiang Liu Chao Zhang Guanchen Li

Progress In Electromagnetics Research C, Vol. 170, 28-37, 2026

doi:10.2528/PIERC26021205 | Google Scholar

Abstract

Aiming to meet the contactless power supply requirements of rotary equipment, this study investigates the coil design and performance of a small resonator for magnetically coupled resonant wireless power transfer (MCR-WPT) systems operating in the MHz band. Based on the series-series (S-S) WPT circuit topology, the influence of coil inductance on the transmission characteristics of the system was analyzed. By combining the inductance calculation formula for planar spiral coils, the geometric parameters of the coil were designed with the objectives of load power (P_RL) > 40 W and transmission efficiency (η_T) > 90%. The rationality of the designed parameters was verified by field-circuit coupled simulation, and the influence laws of the driving frequency and transmission distance on transmission characteristics were also analyzed. The coils were wound according to the designed parameters, and both static and rotary dynamic power transfer experiments were conducted. The simulation results show that the designed coil achieves a transmission efficiency of 94.783% at a transmission distance of 50 mm in the 1 MHz, which meets the preset design objectives. The results of the static experiment and the dynamic rotation experiment show that the overall operating efficiency of the system (η_dc-dc) is 84%. This study demonstrates the feasibility of the proposed coil design method, and the designed small coil can realize high-efficiency and stable wireless power transfer under rotary working conditions. The research findings provide a reference for the coil design and engineering application of rotary MCR-WPT systems in the MHz band and possess practical value for the contactless power supply of sensors in rotary electrical equipment operating in confined spaces.

2026-05-04

PIER C

Vol. 170, 28-37, 2026

doi:10.2528/PIERC26021205

download: 4

Design and Experiment of Compact Rotary MCR-WPT Coils at MHz Band

Kunming Chen, Yanhong Li, Caiyun Dai, Guo-Qiang Liu, Chao Zhang and Guanchen Li

2026-05-04

PIER C

Vol. 170, 15-27, 2026

doi:10.2528/PIERC26030706

download: 8

A Deadbeat Fault-Tolerant Control Strategy for PMSM Demagnetization Faults Based on an Improved Flux Linkage Observer

Yang Zhang, Wancheng Xie, Yang Gao, Jiahao Zhang and Moutao Li

To address issues such as reduced motor output performance and diminished load capacity caused by permanent magnet demagnetization in Permanent Magnet Synchronous Motor (PMSM), a super-twisting algorithm-based fault-tolerant predictive control strategy for demagnetization faults in PMSM is proposed. First, the improved super-twisting non-singular fast terminal sliding mode observer (IST-NFTSMO) is constructed to accurately observe the flux linkage and predict the current at the next moment. Based on the observed values, a deadbeat fault-tolerant predictive control (DFTPC) algorithm is built to compensate for the torque loss due to permanent magnet demagnetization, thereby achieving fault-tolerant control of the system. Second, a sliding mode controller based on a novel reaching law is designed, thereby overcoming the shortcomings of traditional control strategies in PMSM vector control systems, such as poor anti-interference capability and slow response speed. Finally, experimental results demonstrate that after a demagnetization fault occurs in the PMSM, the proposed method effectively improves the fault tolerance capability of the PMSM system while ensuring the dynamic response speed of the control system, thereby endowing the system with enhanced stability and robustness.

A Deadbeat Fault-Tolerant Control Strategy for PMSM Demagnetization Faults Based on an Improved Flux Linkage Observer

2026-05-03

PIER C

Vol. 170, 1-14, 2026

doi:10.2528/PIERC25120601

download: 37

Design Optimization of a Permanent Magnet Biased Fault Current Limiter via Pattern Search for High Efficiency and Reduced Material Use

Tirtha Sankar Daphadar, Tapan Santra and Amalendu Bikash Choudhury

This paper presents a useful design optimization methodology for a permanent-magnet-biased fault current limiter (PMFCL), aiming to achieve good fault current limiting performance with small magnetic materials and their losses. A physics-based magnetic circuit modelling approach is developed to update the nonlinear core saturation and permanent magnet biasing, enabling fast and reliable analysis of candidate designs. Additionally, a weighted multi-objective formulation is adopted to balance fault current mitigation, material volume, and loss minimization. The resulting optimization problem is solved by means of a deterministic pattern search approach, which enables efficient design space exploration without access to gradient information. The optimized configurations are validated using the finite-element simulations, and the robustness of the configurations under practical operating conditions is analyzed. The obtained results show a significant reduction of the magnetic material volume with the optimized PMFCL without compromising and, in certain cases, with an improvement of the function of fault current limiting against a baseline design. The research identifies technical configurations of design that are practical for real-world deployment. The combination of reduced material usage, passive operation, and better energy efficiency means the proposed PMFCL represents a reliable and sustainable solution for better protection of modern power systems, especially in areas where power systems are cost-sensitive and infrastructure-limited.