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CONTROLSUITE: SMO

Part Number: CONTROLSUITE

为什么TI的SMO文档里观测器最后括号里要多一个es(反电动势估计值),一般都是直接Vs-z。如果按照图中公式设计观测器,那么最终电流观测值和电流实际值相等时,z应该等于vs-es啊,不是反电动势,但是我仿真后加不加es这一项z滤波后的结果都是es,这是为什么?