EL5151 PLC常用型号

EL5151 PLC常用型号

得到当Ec=0，也就是反电动势过零时,vc=0， 也就是说当ADC检测到vc=0时，就意味着这个时刻是C相的反电动势过零点， 那么理论上再经过1/12的电周期时间，电机就需要进行换向.

从上面的分析，我们可以看到，使用ADC采样积分方式进行无感BLDC控制，设计上需要注意以下两点

积分阈值跟电机的反电动势峰值和转速比值相关，可能会随着电机不同而不同，需要针对电机进行调整。

上管做PWM驱动的设计下， 可以采用不同的ADC采样策略来针对大duty和小duty的情况，同时反电动势过零点的判断也需要调整

电机高速情况下，电频率相对比较高，而ADC积分采样基于PWM开关周期采样的，所以要获得比较准确的换相点，需要比较高的开关频率，如果开关频率比较低，意味着采样速率慢，可能会造成换相延迟比较大，从而影响电机的正常控制。

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