摘要
在船舶、风电机组及轨道交通等领域,对转轴的状态监测越来越重要。如何为安装于旋转机构上的监测系统提供稳定可靠的电能,成为亟待解决且具有挑战性的难题。无线电能与信号并行传输是一个可行方案,它既适用于旋转结构的特殊应用场合,能够提供稳定可靠的电能,又能够实现轴端状态数据的回传,实时监测转轴的健康状态。但是,对于一些较大轴径的旋转机构,系统将会面临两个问题:(1)接收线圈过长,会导致损耗严重,且接收线圈包裹整个转轴,线圈整体全部通电,会产生严重的电磁辐射;(2)轴端接收侧的曲面能量线圈与信号线圈如何实现解耦。在此基础上,该文首先提出一种平面-曲面解耦线圈结构,分析能量线圈与信号线圈间的解耦关系。同时,系统的副边能量线圈采用分段方式,以减小电磁辐射和线圈损耗,并提出三母线的电路结构,克服线圈过渡段时的功率跌落。然后建立旋转机构无线电能与信号并行传输的等效电路,并分析系统的传输特性。最后,通过有限元法模拟和实验进行了验证。结果表明,所提平面-曲面解耦线圈结构,使得能量线圈与信号线圈之间的互感基本为0,三母线电路结构也将系统输出电压波动抑制在10%以内,实现了旋转机构无线电能与信号的并行传输,验证了所提方案的可行性。
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 9600 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.
作者
程豪
周玮
张泽恒
张一鸣
麦瑞坤
Cheng Hao;Zhou Wei;Zhang Zeheng;Zhang Yiming;Mai Ruikun(School of Electrical Engineering Southwest Jiaotong University,Chengdu 611756 China)
出处
《电工技术学报》
北大核心
2025年第14期4395-4405,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(U22A20222)。
关键词
旋转机构
电能与信号并行传输
平面-曲面解耦线圈
三母线电路结构
Rotating mechanism
parallel transmission of power and signal
plane-curved decoupling coil
three-bus circuit structure
