【填空题】
22154.___产品的组成零部件和装配精度高，系统的精度一定就高。
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【填空题】
22155.___为减少机械传动部件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的 2～3 倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。
【填空题】
22174.___数字式位移传感器有光栅、磁栅、感应同步器等，它们的共同特点是利用自身的物理特征，制成直线型和圆形结构的位移传感器，输出信号都是脉冲信号，每一个脉冲代表输入的位移当量，通过计数脉冲就可以统计位移的尺寸。
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