有级调速机构、无机调速机构分别与传动系统中的调速齿轮组和差动轮系匹配。
The step speed regulating mechanism and the stepless speed regulating mechanism are separately matched with the speed regulating gear set and the differential gear train of the transmission system.
ZK3-6/250单级传动电机车采用有级调速，其特点为操作简单方便、结构简单、运行可靠、维护方便等。
ZK3-6/250 single stage drive electrical locomotive adopts step speed adjustment with the characteristics of easy operation, simple structure, reliable running and easy maintenance etc.
该方法是通过调节转子回路附加电阻的有级调速，难以实现平滑地调速，而且调节性能差，调速过程中大量的转差功率通过转子回路电阻转化为热能消耗掉了。
This method regulates speed by changing the number of steps of the additional resistor in the rotor circuit, so it's hard to realize smooth speed-regulation, also its performance is poor.
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