罗克韦尔粗存卡1784-SD1

1784-SD1

磁场定向控制（FOC）的基本原理：通过角度解析 ，产生和转子相对静止的控制磁场，实现对PMSM的像素级控制。关键的关键就是对电机转子的位置信息获取，一般来讲有如下几种方案：

1. 位置编码器：通过光栅感应定子旋转过程中引起的数字编码变化，从而解析转子位置信息，一般应用在伺服系统中。

2. Hall磁编码器：通过在电机轴的端部安装的永磁体旋转，引起Hall传感器的磁感线变化，从而解析转子位置信息，一般应用在中小功率泵类驱动系统中。

3. 旋转变压器：电机轴的旋转引起旋转变压器感应电压的变化，通过解码算法，从而解析转子位置信息，一般应用在高可靠性、高寿命的电动汽车系统中。

4. 观测器位置算法：这是一种无位置传感器的方法，通过电机模型的建模计算出反电动势的变化，从而解析出转子的位置信息，该方法可靠性高，成本低，维护方便，也是电机控制火热的方向。笔者认为，该方案主要取代的是Hall编码器的应用市场，对于高可靠性，快速动态性能的场合应用还是比较有限。

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