MPL-SSN-A8B8
無刷直流電動機的結構如左圖所示，為了實現無刷換向，無刷直流電動機將電樞繞組安裝在定子上，而把磁鐵安裝在轉子上，該結構與傳統的直流電動機相反。由於去掉了電刷和整流子的滑動接觸換向機構，了直流電動故障的主要根源。
常見的無刷直流電動機為三相永磁同步電動機，其原理如下圖所示，無刷電動機的換向原理是：採用三個霍爾元件，用作轉子的位置傳感器，安裝在圓周上相隔120°的位置上，轉子上的磁鐵觸發霍爾元件產生相應的控制信號，該信號控制晶體管 VT1、VT2、VT3有序地通斷，使得電動機上的定子繞組 U、V、W 隨著轉子的位置變化而順序通電、換相，形成旋轉磁場，驅動轉子連續不斷地運動。無刷直流伺服電動機採用的控制技術和交流伺服電動機是相同的。
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