MVME133XT
MVME133XT在實踐中，可以達到 1% 左右，但峰值轉矩和功率密度低於梯形反電動勢。
這種布局就是 “永磁同步電機”（PMSM)，要求所有的繞組在任何時候都要通電，因此浮動繞組的位置信息不可用，通常需要一個單獨的軸傳感器。
無論哪種情況，PWM 驅動調制都會設置為分別與梯形或正弦匹配，以獲得佳性能。
六步梯形波控制更容易實現，能夠以高轉矩啟動，並適用於非常高的速度，比如在電動工具中就很有用。
基本形式的 PMSM，其制造成本較高，啟動轉矩較低，驅動更復雜，但速度控制更穩定，適合換氣風扇等應用。
有些方案從梯形波驅動啟動，並隨電機旋轉切換到正弦驅動，為了獲得佳性能，可將光學編碼器或旋轉變壓器用於 PMSM，以取代霍爾傳感器。
MVME133XT
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