电机MPM-B1653E-MJ74AA

MPM-B1653E-MJ74AA

在小电机的应用中，BLDC越来越广泛，对其要控制要求也是越来越高： 既要低成本，也要静谧性！ 我们知道Six-Step的转矩脉动很大，电机功率小的应用还能忍受，电机功率稍微到几百瓦这个量级，噪音成为了产品的短板！因此，很多厂家也推出了类FOC的控制方案去控制BLDC，这类方案在 不增加系统成本得前提下 ，使BLDC运行的更安静！

所谓类FOC，其实主要的就是我们把BLDC的角度进行更细的划分，那么这个更细角度主要是靠：猜！通过反电动势检测，我们能够检测出60°的反电动势换向点，那么在这个60°之间的角度，就要根据电机的运行速度和状态去插值，从而产生类似的平稳的“ 定向磁场 ”。

现在还有一个问题，就是三相都参与调制的情况下如何检测反电动势换向点？可以采用低成本数字Hall芯片进行磁钢位置检测，也可以通过驱动的适当控制，检测反电动换向点。是ELMOS所采用的一种的算法：就是在死区时间段内，检测相电压信号，从而获得相电流的方向信息，进而找出相电流的过零点。 从相电流推断反电动势过零点 ，可以预见该方法的环路响应是比较慢的。

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