And then the power of servo motor is calculated according to crank press working load, kinematical characteristic, torque and rotational momentum.
以变速驱动压力机的工作负荷、运动特点、工作总功、力矩和角动量为基础，计算其驱动电动机所需的功率。
2
According to torque vs. speed characteristic of stepping motor, the higher startup speed is, the smaller startup torque is and then the worse the capability of driving load is.