6EP1333-4BA00
精度有兩個組成部分,電氣和機械。電氣錯誤是由相位不平衡引起的。例如,電機的繞組電阻規格為±10%,可能電機額定功率為10W,但一相可能為9.2W,另一相可能為10.6W。相之間的這種差異會導致轉子比另一相更朝向一相對齊。
機械誤差有幾個組成部分,主要的一個是齒形。雖然電機上的齒應該是方形的,但沖壓工藝和模具的使用年限可能會導致某些齒或齒的一部分變圓。當齒變圓時,磁通量不是直接流動,而是可以流動到別處。因此,這些因素會影響電機的精度。
使用全步驅動器,兩相電機每 4 步重復一次狀態,而在 5 相電機中,狀態每 10 步重復一次。由相位不平衡引起的任何電氣錯誤在 2 相中每 4 步和 5 相中每 10 步被否定,只留下機械錯誤。
一旦電機完成完整的 360° 旋轉,同一個齒現在在原始起點處對齊,了機械誤差。由于 2 相電機每轉 200 步,每 200 步幾乎,而 5 相電機每轉 500 步,每 500 步幾乎。
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