本文提出一类不依赖被估计系统模型微分状态估计器，参数少、精度高，通过分析其根轨迹和极点要求配置合适的参数；
This paper presents a new differential state estimator, which does not rely on the model of the estimated system and has higher accuracy with a few parameters.
为实现永磁同步电机的状态在线估计，采用一种新型带有微分器的高阶滑模控制技术。
The high order sliding mode control is designed to avoid chattering problem which exists in traditional sliding mode.
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