Rotor cage faults detection in induction motors by Motor Current Demodulation Analysis
Rotor cage faults detection in induction motors by Motor Current Demodulation Analysis
复制标题
通过电机电流解调分析检测感应电机转子笼故障
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
P. Fuchs
中科院分区：
文献类型：
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作者：
I. Jaksch;P. Fuchs
Dynamic rotor faults of induction motors, mainly broken or cracked rotor bars and dynamic rotor eccentricity, cause stator currents modulation. The detailed motor current analysis revealed meaningful phase modulation and its relation to amplitude modulation at increasing motor load and inertia load It is shown, that by increasing motor load mainly phase modulation increases and by increasing inertia load a phase shift between both modulations currents changes. This influences the MCSA spectral sidebands amplitudes and therefore it is not possible to determine the real fault size. The paper introduces a new method of motor current amplitude demodulation analysis -MCDA and shows that spectral amplitudes almost do not change with increasing load and inertia load Moreover MCDA directly analyzes fault signals without great motor stator current and increases resolution both in amplitude and frequency domains, facilitates and precises evaluation. Two demodulation methods using Hilbert transform and space transform are introduced
