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Chinese railway heavy freight transportation needs large power AC-drive electric locomotive urgently,This paper technically makes comparison among the four-pole and six-pole three phase asynchronous traction motors,points out that the six-pole motor is the best,then puts forward its main technical parameters.

中国铁路货运重载正急需发展大功率交流传动电力机车,笔者针对货运电力机车设计选用六极和四极电动机进行了对比论述,指出采用六极电动机是最佳技术选择,并提出了建议研制的六极电动机主要技术参数。

It is well known that sextupoles are equivalent to the drift spaces under first order approximation.

用Lie代数方法分析了相对论带电粒子在六极磁铁中的运动 ,得到在六维相空间中粒子的三级近似轨迹 。