1794-IP4
2 相和 5 相的第二個區別是相數。兩相電機有兩個相,“A”相和“B”相,而五相電機有五個相。本質上,相數是指按順序通電以吸引轉子的不同磁極組合。
2相和5相頭對頭
這些差異如何影響性能?步進電機的性能涉及許多因素。驅動步進電機的方法有很多種,而驅動器會地影響電機的性能。Wave Drive、Full Step、Half Step 和 Microstep 是常見的驅動方法,每種方法都提供截然不同的性能。在不考慮各種驅動方法的情況下,這里是 2 相和 5 相步進電機的關鍵性能領域。
解決
在結構上,5 相步進電機與 2 相電機沒有太大區別。兩個電機的轉子都有 50 個齒。不同之處在于,因為 5 相電機有 10 個極,每相 2 個,轉子只需移動 1/10 齒距即可與下一相對齊。在 2 相電機中,轉子移動 1/4 個齒距以與下一相對齊(8 極,每相 4 個)。
這導致 2 相每轉 200 步,每步 1.8°,而 5 相每轉 500 步,每步 0.72°。5 相分辨率的提高是其設計所固有的。當與微步進驅動器結合使用時,5 相電機的步距可小至 0.00288°,但位置精度和重復精度仍受限于電機的機械精度。2 相和 5 相電機的機械精度均為 ± 3 弧分 (0.05°)。
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