MPM-B1653E-SJ72AA

MPM-B1653E-SJ72AA

变磁阻电机由于其特殊的控制方式（脉冲式交替导通），增加定子和转子的突极数量或者增加定子的 通电相数 ，可以将移动角度进行细分。这种细分的结构有很多种，角扭矩特性也不一样，就不展开进行讨论。本文将探讨几种常见的变磁阻电机机构，从不同的维度看看步进电机是如何从千变万化的变磁阻电机结构中脱颖而出的。

前面说到增加突极数量，可以将移动的角度进行细分，但是越多的突极将会占用大量的线圈空间，电机绕线效率降低，不能增加突极。在驱动相数不变的情况下，通过在突极上刻上一个个小齿，同样可以将机距角进行细分。如图2.1所示，为 三相城堡式变磁阻电机 ，定子为6极，每极4齿，转子为28极。依次对线圈1，线圈2，线圈3进行通电，可以驱动转子旋转，每一步的步进距离为2β/3。β值需要根据电机设计的齿槽比进行设计，这里不展开讨论。

这种电机一般应用在低速、大扭矩和精密角度分辨率的场合，这种结构已经可以称为“ 步进电机 ”，因为该电机的控制以及可以 脱离位置检测 ，通过脉冲序列驱动就能实现比较平稳的控制。

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