温度影响下的开槽盘式磁力耦合器调速特性

Speed regulation performance of slotted-type axial-flux magnetic couplers under temperature influence

针对温度影响下盘式磁力耦合器调速问题,以一台6对极16槽的开槽盘式磁力耦合器为研究对象,基于矢量磁位法,结合修正三维端部效应的卡特系数并考虑温度对永磁体剩磁的影响,依据磁力耦合器轴向介质不同与导体盘轭铁和铜导体交替排列的结构,推导出其整体的电磁转矩公式。再分别建立恒转矩负载、二次方率负载和恒功率负载工况下的调速关系解析模型。通过有限元模拟分析,确定了不同温度、不同气隙下的开槽盘式磁力耦合器在3种不同负载工况下的调速范围与调速特性。最后,搭建试验平台进行调速性能试验,将不同负载工况下磁力耦合器电磁转矩与输出转速的理论、仿真、实验值三者进行对比,结果表明理论模型有较高的准确性,为开槽型磁力耦合器在调速系统中的智能调控提供了理论依据。

In order to solve the speed regulation problem of the axial-flux magnetic coupler affected by temperature,a slotted-type magnetic coupler with 6 pairs of poles and 16 slots was taken as the research object.Based on the axial media of the magnetic coupler and the structure of the conductor disk yoke with alternating arrangement of iron and copper conductors,using the vector magnetic potential method,combined with the Carter coefficient of correcting the three-dimensional end effect,taking the influence of temperature on the remanence of permanent magnets into consideration,the whole electromagnetic torque formula was derived.Then,the analytical models of speed regulation relationship under constant torque load,quadratic rate load and constant power load were established respectively.By using finite element simulation,the speed range and characteristics of the slotted-type magnetic coupler under different temperature and air gap were determined under three different load conditions.Finally,a test platform was built for speed regulation performance test,and the theoretical,simulation and experimental values of electromagnetic torque and output speed of magnetic coupler under different load conditions were compared.It is found that the theoretical model has high accuracy,and these studies provide a theoretical basis for intelligent control of slotted magnetic coupler in speed control system.