Abstract: In order to solve the problems of large vibration, high noise and easy resonance in the transmission process of the existing coupling of agricultural machinery equipment, a high‑speed synchronous permanent magnet coupling (HSPMC) with Halbach array as outer magnetic circuit and N—S alternating mixed magnetic circuit as inner magnetic circuit was designed. Firstly, Ansoft software was used to simulate the magnetic circuit of HSPMC, and the influences of key design parameters on the transmission torque of HSPMC were analyzed. Secondly, the maximum stress and the maximum deformation of the magnetic steel fixed sleeve were 876.5 MPa and 209.9 μm respectively when the working speed of HSPMC was 20 000 r/min. Finally, the prototype was made for torque test verification. The results show that the maximum torque of HSPMC increases first and then decreases with the increase of magnetic poles, and the maximum torque of HSPMC increases with the increase of the magnetic ratio or the magnetic steel thickness. When the operating speed is less than 20 000 r/min, the strength of magnetic steel fixing sleeve of HSPMC can meet the operating requirements. The errors between the test values and the simulation values of maximum torque of HSPMC are always less than 6%, so HSPMC with hybrid magnetic circuit can meet the normal torque transmission requirements.

Key words: high?speed synchronous permanent magnet coupling, agricultural equipment, magnetic poles, magnetic circuit, torque

摘要： 为解决农机装备联轴器传动过程中大振动、高噪声与共振等问题，设计一种外层磁路为Halbach阵列、内层磁路为N—S间隔交替排列的混合型磁路的高速同步永磁联轴器（HSPMC）。首先，采用Ansoft软件对HSPMC的磁路进行仿真计算，分析关键设计参数对HSPMC传递扭矩的影响。其次，计算HSPMC在工作转速为20 000 r/min时磁钢固定套的最大应力值为876.5 MPa、最大变形值为209.9 μm。最后，制作样机进行扭矩试验验证。结果表明：随着磁极对数的增大，HSPMC的最大扭矩值先增大后减小；随着磁占比系数或磁钢厚度值的增大，HSPMC的最大扭矩值均呈现增大的趋势；当工作转速小于20 000 r/min时，HSPMC的磁钢固定套强度能够满足使用要求；HSPMC最大扭矩的试验值与仿真值误差在6%以内，因此，该混合型磁路的HSPMC能够满足正常的扭矩传递需求。

关键词: 高速同步永磁联轴器, 农业装备, 磁极对数, 磁路, 扭矩