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CMTN_TRIG_MACRO驱动的疑问



在C2000的HVBLDC_SENSORLESS例子中,为什么调用换向驱动CMTN_TRIG_MACRO时,只有在CmtnPointer==5时,才调用DELAY_30DEG_MACRO(v)进行换向延迟,在BEMF过零点时,不是应该每个BEMF过零点时,都需要进行30°延迟,以决定换向点么?

TI的这个例子有点不太理解,请教一下各位高手!

另外还有一个疑问,是关于HVBLDC_SENSORLESS例子中的MainISR中的转子对齐功能,没理解在MainISR中转子对齐的原理!求教!