1-术语定义  Definition of terms 

1-1 步距角-步进电机固有的机械角度，一般为1.8°，0.9°，0.72度等。  Step angle-mechanical angle inherent in stepping motor, generally1.8 °, 0.9 °, 0.72 °. 

1-2 驱动电压-开始工作所需的驱动器供电电压。  Drive voltage-the drive supply voltage required to start operation. 

1-3 丝杆类型-根据摩擦特性可以分为3种，即滑动丝杆，滚动丝杆和静压丝杆。  Screw type-according to the friction characteristics can be divided into 3 types, namely  sliding screw, rolling screw and static screw. 

1-4 导程-指电动机每转动1圈时，工作台向直线方向前进的距离。  Lead-the distance the table moves in a straight line for each turn of the motor. 

1-5 行程-工作台可前进的总距离。  Stroke-total distance the table can travel. 

1-6 精度等级-根据使用要求分为 CO,C3,C5,C7,C10 五个等级。  Accuracy grade-four grades of C3, C5, C7 and C10 according to the requirements of use 

1-7 输出推力-在固定转速下工作台持续输出的最小推力。  Output thrust-the minimum sustained thrust output of a table at a fixed speed.

2-选型&计算  Selection and calculation 

2-1 丝杆的传动效率。  Transmission efficiency of screw rod.

  2-1-1 T型丝杆的传动效率 为 3.14。  The transmission efficiency of t-screw is 3.14. 

  2-1-2 滚珠丝杆的传动效率 为 5.338。  The transmission efficiency of ball screw is 5.338. 

2-2 丝杆寿命-丝杆寿命通常以回转数，回转时间，行走距离数（Km）来表示。  Screw life-the screw life is usually expressed by the number of rotations, rotations,   travel distance (Km) .  

L:额定疲劳寿命（rew) Lt:寿命时间（h） Ls:行走距离寿命（Km） Ph:导程

FW:负载系数（运转条件系数） Pa:轴向负载（kgf) Ca:额定负载 n:回转数

2-3 电动缸额定推力计算  Calculation of rated thrust of electric cylinder 

  2-3-1 额定推力=电机扭力*丝杆传动系数/丝杆导程*减速比  Rated thrust = motor torque * Screw Drive Factor/screw lead * deceleration ratio 

  2-3-2 额定速度（mm/s)=电机额定转速/60*丝杆导程*减速比  Rated speed (mm/s) = Motor rated speed/60 * lead * reduction ratio 

  2-3-3 电动缸的实际推力≈应按照计算出的推力*60%-85%的安全系数  The actual thrust ≈ of the electric cylinder should be 60% to 85% of the   calculated thrust Factor of safety