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SMO模块算法问题

最近HVPM_Sensorless工程调到了SMO模块,模块内部结构图如下所示:

但是看了TI提供的模块说明书《smopos.pdf》,不明白一下几点是怎么来的,请各位不吝赐教。谢谢!

1.估算电流值与实际电流值的误差输入砰-砰控制器的目的是做什么?

2.为什么砰-砰控制器的输出z经过一阶低通滤波就估算出了电动势的值?

再次感谢!