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无刷电机的超前角控制有哪些优点？
当磁铁磁场的相位比线圈磁场滞后90度时，电机可实现最大扭矩。由于反电动势的相位比磁铁磁场超前90度，电机电流与线圈磁场同相位，因此当反电动势和电机电流的相位相同时可获得最大力矩。在这种情况下，电机能以最有效的方式驱动。
然而，如下图所示，当驱动电压与反电动势同相位时，由于线圈的感抗，电机电流的相位会延迟。这会导致产生制动扭矩，从而导致效率降低。
为改善这种情况，采用了一种校正方法，即提前驱动电压的相位，以提前电机电流的相位，使其与感应电压一致，从而消除制动扭矩。这称为超前角控制，可提高直流无刷电机的效率。
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