With a view to develop high accuracy servo system, this paper gives a detailed analysis on mathematical model and character of PWM driver, puts forward a simple rotational velocity estimator.

本文从研制高精度随动系统出发，详细分析了PWM驱动器的数学模型及特性，提出一种简单易行的转速估计器，并在此基础上开发出一种适于中小功率直流力矩电机的新型PWM驱动器。

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