笼型异步电动机转子断条故障检测新方法

计及实际电机本身所固有的非对称、气隙偏心、转子不对中及其它因素，进行高灵敏度、高可靠性的笼型异步电动机转子断条故障检测，是一个亟待解决并颇具工程意义的研究课题，该文即以此作为研究重心。首先完成了笼型异步电动机转子断条故障数字仿真与物理实验。通过分析仿真与实验结果，总结出在转子断条故障检测实践中保证其灵敏度与可靠性的原则及方法。在此基础上，首次将连续细化傅里叶变换、自适应滤波、转子齿槽谐波转差率估计、检测阈值自整定技术有机结合，形成了笼型异步电动机转子断条故障检测新方法。实验结果表明，该方法是切实可行的。

A NOVEL DETECTION METHOD FOR BROKEN ROTOR BARS IN INDUCTION MOTORS

This paper addresses to develop high-sensitivity high-reliability detection scheme for induction motor broken rotor bar fault, taking into account the intrinsic asymmetry, air-gap eccentricity and rotor disalignment of induction motor. Firstly, numerical simulation and related experiments of broken rotor bar fault have been performed successfully. Secondly, a series of principles and laws, which assure the sensitivity and reliability of broken rotor bar fault detection in practice, are generalized and revealed, based on thorough analysis of simulation and experiment results. Finally, a novel scheme to detect broken rotor bar fault, which perfectly blends continuous subdivision Fourier transform, self-adaptive filter, rotor slot harmonics based slip estimation and detection threshold self-tuning technique, is proposed in this paper. Fault detection instances in laboratory demonstrate that the presented scheme is valid and effective.