减速机的主要特点是具有反向自锁功能，可以有较大的减速比，输入轴和输出轴不在同一轴线上，也不在同一平面上。但是一般体积较大，传动效率不高，精度不高。
The main feature of the reducer is a reverse self lock function, which can h***e a larger reduction ratio. The input shaft and output shaft are not on the same axis, nor on the same plane. But the general volume is large, the tran***ission efficiency is not high and the precision is not high.
在减速机家族中，行星减速机以其体积小，减速范围广，精度高等诸多有点，而被应用于伺服、步进、直流等传动系统中。其作用就是在保证精密传动下，主要被用来降低转速增大扭矩和降低负载/电机的转动惯量比。
In reducer family, planetary reducer is applied to servo, step and DC tran***ission systems because of its ***all volume, wide range of deceleration and high accuracy. Its role is to ensure the precision drive, mainly used to reduce the rotational speed to increase the torque and reduce the load / motor inertia ratio.
减速机的作用
1)降速同时提高输出扭矩，扭矩输出比例按步进电机输出乘减速比，但要注意不能超出减速机额定扭矩。
2)速同时降低了负载的惯量，惯量的减少为减速比的平方。大家可以看一下一般电机都有一个惯量数值。
The function of the reducer
1) reduce the speed and increase the output torque at the same time. The ratio of the torque output to the multiplying and decelerating ratio of the stepper motor output, but we must be careful not to exceed the rated torque of the reducer.
2) speed reduces inertia of load at the same time, and inertia reduces to the square of deceleration ratio. As you can see, general motors h***e an inertia value.