当选用斜齿轮减速机时有以下几点需要注意：
允许输入轴径：减速机的输入轴孔与电机输出轴一般是通过一个厚度可以变化的套环来连接的。当不加套环时减速机输入轴孔为高值。
When choosing a helical gear reducer， there are several pointsto be paid attention to:
Allowable diameter
The input shaft of the reducer and the output shaft of the motorare generally connected by a sleeve that can be changed by athickness. The input shaft hole of the reducer is the maximum whenthe ring is not added.
我们要购买减速机的首要步，首先要确定一点，我们购买的目的。对于减速机的分类，细化开来，减速机工厂，有摆线针轮减速机，行星齿轮减速机和蜗轮蜗杆减速机等。还有使用较少的谐波齿轮减速机、滚子凸轮减速机、超环面蜗杆减速机等等。
We want to buy the first step of the reducer， first of all todetermine a point， the of our purchase. For the reducer ofclassification， refined， there are cycloid gear reducer， planetarygear reducer and worm gear reducer and so on. There are also lessharmonic gear reducer，减速机， roller cam reducer，减速机哪家好， toroidal wormreducer and so on.
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 sametime. The ratio of the torque output to the multiplying anddecelerating ratio of the stepper motor output， but we must becareful not to exceed the rated torque of the reducer.
2) speed reduces inertia of load at the same time， and inertiareduces to the square of deceleration ratio. As you can see，general motors have an inertia value.
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