西门子6GK7277-1AA10-0AA0

6GK7277-1AA10-0AA0

步进电机的停止精度在很大程度上取决于其绕组特性、转子构造精度以及转子中的齿数/极数。伺服电机的停止精度取决于装配精度、编码器分辨率和操作算法。 在某种程度上，您可以说步进电机是为定位应用而“机械设计”的，而伺服电机是为定位应用而“电气设计”的。

高速性能

众所周知，伺服电机比步进电机运行速度更高。这真正意味着伺服电机将在指定的 RPM 下输出比步进电机更大的扭矩。扭矩性能的这种差异来自极数的差异以及伺服电机和步进电机设计之间的绕组电感。

极数也会影响电机绕组需要前进的次数才能使电机旋转一圈。对于伺服电机，可能只需要 12 个“步”就可以转动一整圈。但是，对于 2 相步进电机，它需要 200 个“步” 。在低速时，这不会产生显着差异。但是，在高速行驶时，驱动器将无法为绕组完全通电。由于电流与扭矩成正比，因此扭矩会在高速时降低。

步进电机和伺服电机之间的性能差异可以通过它们的速度-扭矩曲线得到好的体现。这是一个比较相同框架尺寸的步进电机和伺服电机的示例。

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