中文摘要：

介绍了分数阶傅里叶变换的原理及其对线性调频信号的处理优势。以变频调速异步电机系统为研究对象,重点分析了在恒加速和恒减速运行模式下,系统的输出具有近似线性调频信号的特征,在总结变频调速异步电机在定子电流频谱上出现的断条故障特征的基础上,提出了基于分数阶傅里叶变换的变频调速异步电机断条故障诊断方法。实践证明,该方法可以有效地分析变频调速异步电机故障。

英文摘要：

Principle of fractional fourier transform（FRFT） and alternation to that linear modulate frequency（LMF） treatment advantage were introduced.Research on variable frequency speed regulation system with asynchronous motor,the output of the system had the characteristics of LMF approximately,with placing an emphasis on constant acceleration and constant deceleration operation mode.On the basis of summing up diagnostic characteristics of broken rotor bars appearing on frequency spectrum in electric current of stator winding of the variable frequency speed regulation system with asynchronous motor,diagnosis of broken rotor bars for the variable frequency speed regulation system with asynchronous motor based on FRFT was recommended.It found that the method is able to analyze diagnostic characteristics of the variable frequency speed regulation system with asynchronous motor.