恒负载工况下调速型磁力偶合器气隙特性研究

Research on characteristics of air gap of speed-regulation magnet coupler under condition of constant load

以轴向永磁异步调速型磁力偶合器为研究对象,基于磁路法建立了磁力偶合器输出转速与气隙的数学模型,分析了磁力偶合器的气隙特性,研究了恒负载工况下磁力偶合器的气隙与输出转速的关系,获得了磁力偶合器在不同气隙下对应的输出转速变化规律:随着永磁体盘和铜盘之间工作气隙的增加,磁力偶合器输出转速逐渐减小,当气隙从2.5~12.5mm线性增加时,输出转速从773r/min逐渐减小至723r/min;当负载转矩一定时,随着气隙的增加,功率损耗逐渐增加,当气隙从2.5~12.5mm线性增加时,实验功率损耗从565W逐渐增加至1 613W,在实际运行中,可以通过适当减小气隙来减小功率损耗。这一研究结果对调速型磁力偶合器在恒负载工况下的输出转速控制具有一定的指导意义。

Taking axial permanent magnet asynchronous speed-regulation magnetic coupler as research object,a mathematical model of output speed and air gap of speed-regulation magnetic coupler was built based on magnetic circuit method,characteristics of the air gap of magnetic coupler were analyzed,relation between the air gap and output speed of the magnetic coupler under condition of constant load was studied,and variation law of corresponding output speed with different air gaps of the magnetic coupler was obtained：with increasing of the air gap between copper disc and permanent magnet disc,output speed of the magnetic coupler decreases;when the air gap increases linearly from 2.5 mm to 12.5 mm,the output speed decreases gradually from 773 r/min to 723 r/min;when the load torque keeps constant,with increasing of the air gap,power loss increases gradually,and when the air gap increases linearly from2.5 mm to 12.5 mm,the experimental power loss gradually increases from 565 Wto 1 613 W.In actual operation,power loss can be reduced by reducing the air gap properly.The results of the research have a certain guiding significance for the output speed control of the speed-regulation magnetic coupler under condition of constant load.