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。
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.
从步进电机的矩-频特性可知，启动频率越高，启动转矩越小，带动负载的能力越差。
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