MPL-B420P-SJ74AA

MPL-B420P-SJ74AA

空心杯电机，它属于直流有刷电机。它的转子没有铁芯，所以转动惯量小，响应快。它的体积可以做的很小，广泛用于飞行器，调焦，仪器仪表等。下图是个 716 空心杯，即直径 7mm，长度 16mm。

步进电机，下图为一个两相混合步进电机。可以看到一共有 8 个绕组，分为 A，B 两相，1 3 5 7 为一相，2 4 6 8 为一相。定子和转子上均匀分布这很多小齿，他就是靠 A B 相通电时，定子和转子上不同极性的小齿交错对齐，驱动转子转动。它的控制也很简单，A B 相交替通电脉冲，就可以一步一步驱动转子转动，步进角为 1.8°。

直流无刷(BLDC)和永磁同步(PMSM) 一般我们约定俗成，把用霍尔传感器测定转子位置，反电动势为梯形波，用六步换相控制的电机叫直流无刷。把用编码器测转子位置，反电动势为正弦波，用矢量控制(FOC)的电机叫永磁同步。

其实很多 BLDC 的反电动势也不是标准的方波，而是接近正弦波，也可以用矢量控制。同样的，永磁同步也可以用六步换相控制。而且永磁同步也是用直流供电，肯定也是无刷的。

采用矢量控制的永磁同步电机转矩脉动很小，转动平稳，在低速下也能输出大力矩。而直流无刷电机控制简单，成本更低。

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