This paper presents a new approach of fault diagnosis, which makes use of the inversion of system to detect faults and can solely isolate the fault source and can get the magnitude of fault.

本文提出了一种新的故障诊断方法，利用系统的逆检测故障，并对故障源进行唯一定位且求出故障大小。

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The method can directly detect the fault characteristic signals in low frequency band and achieve fault diagnosis.

该方法直接检测故障的低频特征信号，完成故障诊断。

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Monitoring and analysis of the motor running status could detect fault in early phase and prevent the deterioration. Motor faults diagnosis is of great significance.

在电机运行时对其运行状态进行监测和分析可及早发现故障，防止故障的进一步恶化，具有十分重要的意义。

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