描述
步进电机的动态力矩一下子很难确定，我们往往先确定电机的静力矩。静力矩选择的依据是电机工作的负载，而负载可分为惯性负载和摩擦负载二种。单一的惯性负载和单一的摩擦负载是不存在的。直接起动时（一般由低速）时二种负载均要考虑，加速起动时主要考虑惯性负载，恒速运行进只要考虑摩擦负载。一般情况下，静力矩应为摩擦负载的2-3倍内好，静力矩一旦选定，电机的机座及长度便能确定下来（几何尺寸）。
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