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1794-IP4
2 相和 5 相的第二个区别是相数。两相电机有两个相,“A”相和“B”相,而五相电机有五个相。本质上,相数是指按顺序通电以吸引转子的不同磁极组合。
2相和5相头对头
这些差异如何影响性能?步进电机的性能涉及许多因素。驱动步进电机的方法有很多种,而驱动器会地影响电机的性能。Wave Drive、Full Step、Half Step 和 Microstep 是常见的驱动方法,每种方法都提供截然不同的性能。在不考虑各种驱动方法的情况下,这里是 2 相和 5 相步进电机的关键性能领域。
解决
在结构上,5 相步进电机与 2 相电机没有太大区别。两个电机的转子都有 50 个齿。不同之处在于,因为 5 相电机有 10 个极,每相 2 个,转子只需移动 1/10 齿距即可与下一相对齐。在 2 相电机中,转子移动 1/4 个齿距以与下一相对齐(8 极,每相 4 个)。
这导致 2 相每转 200 步,每步 1.8°,而 5 相每转 500 步,每步 0.72°。5 相分辨率的提高是其设计所固有的。当与微步进驱动器结合使用时,5 相电机的步距可小至 0.00288°,但位置精度和重复精度仍受限于电机的机械精度。2 相和 5 相电机的机械精度均为 ± 3 弧分 (0.05°)。
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