具有极间隙的新型永磁式丝杠仿真研究

Simulation on Properties of a New Linear-rotary Magnetic Gear with Polar Gap

为解决实际工程应用中加工精度或装配误差等因素导致的磁极间存在间隙或其他绝缘性材料形成间隔的问题,设计了一种具有极间隙的新型永磁式丝杠结构。提出了极距比的概念,应用有限元仿真技术,研究了极距比及直径、节距对最优极距比的影响。结果显示:峰值推力和峰值转矩随极距比的增大而减小;存在最优极距比为0.3,使得输出推力密度与转矩密度较大的同时,比推力和比转矩最大,磁能利用率最高;改变丝杠直径和节距,最优极距比不变。

In order to solve the problem of gap between magnetic poles or other insulating materials caused by machining precision or assembly error in practical engineering,a new type of linear-rotary magnetic gear(LRMG)with polar gap was designed in this paper.The concept of pole pitch ratio(PPR)was proposed,and the effects of diameter or pole pitch on optimal PPR were investigated.Simulation results show that the peak thrust and peak torque decrease with PPR increasing.And it is found that when PPR is 0.3,the output thrust density and torque density have the largest value,specific thrust and specific torque are also maximum,which means it has the maximum pole utilization ratio.The optimal PPR is not affected by the variation of diameter and pole pitch.