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。
And then the power of servo motor is calculated according to crank press working load, kinematical characteristic, torque and rotational momentum.
建立了包括电流控制电路、功率驱动电路以及五相混合式步进电动机在内的恒频斩波恒总流驱动系统的完整的数学模型；
Mathematical model of the system, included the current control circuit, power driving circuit and five-phase hybrid stepping motor is established.
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