模块输出1769-OF8V

1769-OF8V

步进电机的高极数使其能够产生高启动并在低速下平稳运行。它们可以快速响应，无需编码器即可准确定位，并轻松产生保持力矩。然而，由于高绕组电感、极数和 L/R 常数，在高速区域转矩会降低。 伺服电机的低极数和低绕组电感不会产生高启动扭矩，但可以使它们在整个速度范围内地保持扭矩。

闭环反馈

根据定义，伺服电机采用闭环控制运行，而步进电机通常采用开环控制运行。伺服电机使用反馈来控制电机的位置、速度或扭矩。步进电机被命令移动到特定位置而不需要反馈，但可能会因过载而失去同步。

添加反馈以保持同步确实使驱动器设计复杂化并增加了组件数量。除了来自典型步进电机系统的脉冲发生器、相序器和 FET 之外，伺服电机系统还包含转子位置计数器、F/V 转换器、电流放大器、速度放大器、位置放大器和偏差计数器。所有这些组件都需要在 PID 回路中运行电机，在 PID 回路中，驱动器不断计算误差并调整比例/积分/微分增益以进行实时校正。这就是伺服电机更昂贵且需要处理时间的原因。

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