中文摘要：

鉴于包含运动边界磁场难处理的问题,为精确获得内外磁转子同步旋转隔离套静止其中时的磁场特性,应用Maxwell软件基于时步有限元法对400Hz高速磁力泵永磁联轴器进行了二维有限元瞬态计算.分析了稳态转速下的磁场分布特性,得到了不同转速及磁转角下的磁力线和涡流密度分布,给出了转矩和涡流损耗随转速、磁转角变化的关系.结果表明,内外轴式永磁联轴器输出转矩基本恒定,当转速为7800r/min,磁转角为7.5°时的波动幅值仅为平均值的0.81％;转矩不随转速变化,而随磁转角基本呈正弦变化.涡流损耗随转速增大而增大,随磁转角增大而减小;磁转角7.5°时,n=7800r/min涡流损耗为n=750r/min涡流损耗的108倍.由于隔离套涡流损耗产生的附加磁场的作用,内外磁转子气隙不同半径处的磁感应强度有所差别;相同磁转角下,R=38.1mm处周向磁密幅值均大于R=36.55mm处,且其周向磁密向磁转子转动方向偏移,而R=37.4mm处的周向磁密向磁转子转动的反向偏移.

英文摘要：

The magnetic field problem with moving boundary is hard to solve. To precisely get the moguetic characteristic of a radial magnetic coupling with synchronous rotating inner and outer magnetic rotors and stationary sleeve, the 2D finite element transient analysis was calculated by time-stepping finite element method, based on Maxwell software. The magnetic field under steady speed condition was analyzed. The flux lines and eddy current density under different speeds and torsion angles were obtained. The peormance parameter curves of torque and eddy current loss with speeds and torsion angles were given, too. The results show that the outputted torque is nearly constant. The oscillation amplitude is only 0.18% of the mean value when the torque angle is 7.5° and rotational speed is 7800r/min. The torque does not change with speed, but changes sinusoidally with torsion angle. The eddy current loss increases along with the increase of speed, while decreases with the increase of torsion angle. When the torque angle is 7.5°, the eddy current loss under 7800r/min is 108 times of that under 750r/min. Due to the additioned magnetic field effect produced by the eddy current loss in the sleeve, the magnetic flux density at different radius in the air gap is different. The aptitude of circumferential flux density at R=38.1mm is larger than that at R =36.55mm under the same torsion angle. And their circumferential flux density changes in the positive rotating direction, while the circumferential flux density at R=37.4mm changes in the opposite position.