西门子产品6ES7322-5FF00-0AB0

6ES7322-5FF00-0AB0

由单个转子和具有多相绕组构成的变磁阻电机，也被称为“ 单段式变磁阻电机 ”。另外一种变磁阻电机是将转子和定子分为很多段，可以在不增加定子相数的情况下进行细分，并且对 定子的绕线结构更友好 ，可以设置一段一相，几乎取消的多相电机互绕的端部。对于n段电机，各段的转子或者定子错开其极距角的1/n，可将极距进一步进行n倍细分。

单纯的变磁阻电机，旋转的方向取决于 脉冲电流的时序和电机磁阻结构 ，而不受电流方向的影响。在不通电流的情况下，由于没有磁阻 转矩 ，转子不能固定在特定的位置，这将进一步增加控制的难度。在原有的开关磁阻电机的结构基础上加入永磁体，构成永磁式或者混合式变磁阻电机，能够显著提高步进电机的转矩和位置精度，这也是目前常见的步进电机的结构。

如图2.2所示，混合式步进电机结构上很像多段式变磁阻电机，在转子的两段之间插入永磁体，可以看出在近端为N极远端为S极。定子可以设计为单段电机的结构，并且 只需要两相驱动 ，大大简化了电机结构和成本。图示电机的转子极对数为3，因此一个电周期对应的机械角度为360/(2*3)=60。

为了便于理解，θ为机械角度，具体的驱动顺序：

1. θ=0~10，相1和相2 同时通幅值相等的正电流

2. θ=10~20，相2单独通正电流

3. θ=20~30，相1单独通负电流

4. θ=30~40，相1和相2 同时通幅值相等的负电流

5. θ=40~50，相2单独通负电流

6. θ=50~60，相1单独通正电流

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