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<p>Currently, most systems that use wireless power transfer (WPT) to power detection circuits on rotating shaft have the disadvantages of large size and high cost. To solve these shortcomings, a compact magnetic coupler is used, and a single-switch inverter circuit is used for rotational WPT system (R-WPT). The proposed system exhibits a constant voltage characteristic independent of the load. The proposed magnetic coupler consists of a flattened transmitting side and a receiving side that surrounds the rotating shaft. To enhance the coupling performance of the proposed magnetic coupler, simulations optimize the transmitting side ferrite and the receiving side composite shielding layer separately. It is found that flattening the ferrite on the transmitting side and increasing the thickness and length of the soft ferrite on the receiving side contribute to enhancing the coupling performance. To reduce the cost of soft ferrite, the coupling performance of uniformly spaced strip-shaped soft ferrite laid on the rotating shaft is analyzed. It is observed that when the total central angle equals 180° and divided into 16 equal parts, it exhibits coupling performance greater than 95% of that achieved by fully covering the rotating shaft with soft ferrite. Finally, an experimental prototype is constructed to validate the theoretical analysis, and the overall maximum efficiency of the prototype is 83.3%.</p>

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Design of compact magnetic coupler and high-reliability transmission circuit for rotational wireless power transfer system

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Haiyun Luo,
  • Xinyu Tan,
  • Kang Liu,
  • Zhihao Wei,
  • Moyang Cheng,
  • Zhaozheng Zhou

摘要

Currently, most systems that use wireless power transfer (WPT) to power detection circuits on rotating shaft have the disadvantages of large size and high cost. To solve these shortcomings, a compact magnetic coupler is used, and a single-switch inverter circuit is used for rotational WPT system (R-WPT). The proposed system exhibits a constant voltage characteristic independent of the load. The proposed magnetic coupler consists of a flattened transmitting side and a receiving side that surrounds the rotating shaft. To enhance the coupling performance of the proposed magnetic coupler, simulations optimize the transmitting side ferrite and the receiving side composite shielding layer separately. It is found that flattening the ferrite on the transmitting side and increasing the thickness and length of the soft ferrite on the receiving side contribute to enhancing the coupling performance. To reduce the cost of soft ferrite, the coupling performance of uniformly spaced strip-shaped soft ferrite laid on the rotating shaft is analyzed. It is observed that when the total central angle equals 180° and divided into 16 equal parts, it exhibits coupling performance greater than 95% of that achieved by fully covering the rotating shaft with soft ferrite. Finally, an experimental prototype is constructed to validate the theoretical analysis, and the overall maximum efficiency of the prototype is 83.3%.