6ES7505-0RA00-0AB0

微步進是一種使小步更小的方法。步長越小，分辨率越高，振動特性越好。在微步進中，相位不是完全打開或完全關閉。它部分打開。正弦波應用于 A 相和 B 相，相隔 90°（在五相步進電機中為 0.9°）。

當大功率在A相時，B相為零。轉子將與 A 相對齊。隨著流向 A 相的電流減小，流向 B 相的電流增加。轉子將向 B 相移動微小的步幅，直到 B 相達到大值且 A 相為零。該過程圍繞其他階段繼續進行，我們有微步進。

有一些與微步相關的問題，主要是精度和扭矩。由于相位只有部分通電，因此電機轉矩降低，通常降低約 30%。也因為步之間的轉矩差太小，電機有時不能克服負載。在這些情況下，可能會命令電機在實際開始移動之前移動 10 步。在許多情況下，有必要使用增加價格的編碼器來關閉回路。

步進電機系統

開環系統

閉環系統

伺服系統

開環

步進電機設計為開環系統。脈沖發生器向相序電路發送脈沖。相序器確定哪些相位需要關閉或打開，如全步和半步信息中所述。定序器控制大功率 FET，然后轉動電機。

然而，對于開環系統，沒有位置驗證，也無法知道電機是否按照指令移動。

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