西门子6ES7505-0RA00-0AB0

6ES7505-0RA00-0AB0

微步进是一种使小步更小的方法。步长越小，分辨率越高，振动特性越好。在微步进中，相位不是完全打开或完全关闭。它部分打开。正弦波应用于 A 相和 B 相，相隔 90°（在五相步进电机中为 0.9°）。

当大功率在A相时，B相为零。转子将与 A 相对齐。随着流向 A 相的电流减小，流向 B 相的电流增加。转子将向 B 相移动微小的步幅，直到 B 相达到大值且 A 相为零。该过程围绕其他阶段继续进行，我们有微步进。

有一些与微步相关的问题，主要是精度和扭矩。由于相位只有部分通电，因此电机转矩降低，通常降低约 30%。也因为步之间的转矩差太小，电机有时不能克服负载。在这些情况下，可能会命令电机在实际开始移动之前移动 10 步。在许多情况下，有必要使用增加价格的编码器来关闭回路。

步进电机系统

开环系统

闭环系统

伺服系统

开环

步进电机设计为开环系统。脉冲发生器向相序电路发送脉冲。相序器确定哪些相位需要关闭或打开，如全步和半步信息中所述。定序器控制大功率 FET，然后转动电机。

然而，对于开环系统，没有位置验证，也无法知道电机是否按照指令移动。

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