本文首先对包括风力机、无刷双馈发电机的风力发电系统进行建模，并通过同步坐标变换分解为两个解耦子系统。
A wind energy conversion system (WECS) model is presented, including wind turbine and brushless doubly-fed machine working as a generator.
本课题基于无位置传感器技术，对应用于空调压缩机的无刷直流电动机系统做了一定的理论分析并进行了设计与实验测试。
Based on sensorless technology, the thesis has done some analysis theoretically and designed and tested the system of BLDCM used on air-conditioning compressor.
对永磁无刷直流电机的转矩脉动的产生机理进行了分析，并根据缝纫机控制器的特点，研究了缝纫机停机过程的换相转矩脉动情况。
The reasons of the torque ripple of BLDCM are presented. A BLDCM drive system used in industrial sewing machine is studied and stop precision of the system is analyzed in detail.
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