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| A Parallel Transmission Technology for Wireless Power and Signal in A Rotating Mechanism Based on Plane-Curved Decoupling Coil |
| Cheng Hao, Zhou Wei, Zhang Zeheng, Zhang Yiming, Mai Ruikun |
| School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China |
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Abstract In sectors such as shipping, wind turbines, and rail transportation, the importance of monitoring the condition of rotating shafts is increasingly significant. How to provide stable and reliable electrical power to monitoring systems installed on rotating mechanisms has become an urgent and challenging issue to address. The parallel transmission of wireless power and signal is feasible for the special application of the rotating structure and returns the rotating shaft’s health status data in real-time. However, regarding rotating mechanisms with large axis diameters, the system might face two problems. The length of the receiving coil is excessive, leading to significant power loss. The receiving coils wrap the entire rotating shaft, and the whole coil is energized, which might produce severe electromagnetic radiation. In addition, decoupling the curved power and signal coils on the receiving side is a problem. This paper proposes a plane-curved decoupling coil structure and analyzes the decoupling relationship between the power and the signal coil. Then, the secondary power coil of the system is segmented to reduce electromagnetic radiation and the power loss on the coil, and a three-bus circuit is proposed to overcome the power drop when the coil is in excess.
Firstly, the structure and equivalent circuit model of the bipolar-ring coil (BRC) are given, and the decoupling principle between the BRC coil and the DD coil is analyzed. Then, a three-bus circuit structure is proposed to suppress the output fluctuation in the transition section of the secondary-segmented system. The working principle of the three-bus circuit structure is analyzed. In addition, the circuit structure of the signal transmission channel is proposed, and the working principle of the signal transmitting and receiving circuits is analyzed. Furthermore, a three-dimensional finite element analysis (FEA) simulation model of the power and signal combined coupler is established. The magnitude and vector of the magnetic field around the plane-curved coil are analyzed based on the FEA simulation. The mutual inductance between the power coil and the signal coil is almost canceled, and the decoupling principle of the proposed coil structure is verified. Moreover, the simulation results show that the equivalent mutual inductance between the transmitting and receiving coils remains constant during the rotation process, and the output fluctuation suppression effect of the three-bus circuit structure is verified.
An experimental prototype with 100 W power, 87.68% power transfer efficiency, and 9 600 bit/s signal transfer rate is built. The experimental results show that the proposed plane-curved coil structure has good decoupling characteristics, and the power channel is relatively independent of the signal channel. The three-bus circuit structure can successfully suppress the output fluctuation range within 10%. Future research is to optimize the signal coil’s structural parameters, improve the signal channel’s transmission characteristics, and achieve higher speed and lower data error in the signal transfer channel. The proposed system has the potential for the condition monitoring of the rotating mechanism.
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Received: 13 August 2024
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2025, Vol. 40 
