MPL-SSN-A8B8

MPL-SSN-A8B8

无刷直流电动机的结构如左图所示，为了实现无刷换向，无刷直流电动机将电枢绕组安装在定子上，而把磁铁安装在转子上，该结构与传统的直流电动机相反。由于去掉了电刷和整流子的滑动接触换向机构，了直流电动故障的主要根源。

常见的无刷直流电动机为三相永磁同步电动机，其原理如下图所示，无刷电动机的换向原理是：采用三个霍尔元件，用作转子的位置传感器，安装在圆周上相隔120°的位置上，转子上的磁铁触发霍尔元件产生相应的控制信号，该信号控制晶体管 VT1、VT2、VT3有序地通断，使得电动机上的定子绕组 U、V、W 随着转子的位置变化而顺序通电、换相，形成旋转磁场，驱动转子连续不断地运动。无刷直流伺服电动机采用的控制技术和交流伺服电动机是相同的。

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