CAJ | 학술논문

转子断条故障难以检测的原因在于工频分量与边频分量在频率上相隔较近且边频信号微弱,这一影响在低转差率时尤为严重。这种情况下,具有高频率分辨率的旋转不变信号参数估计技术（ estimation of signal pa-rameters via rotational invariance technique,ESPRIT)的估计效果也失去意义。因此,引入复调制技术,将工频分量搬移至0 Hz并予以滤除。同时,引入hilbert变换构成解析信号,利用其单边频谱性解决负频率分量问题。进而,提出了基于复调制滤波与ESPRIT的异步电动机转子断条故障检测新方法。仿真与实验验证了此方法的有效性。
전자단조고장난이검측적원인재우공빈분량여변빈분량재빈솔상상격교근차변빈신호미약,저일영향재저전차솔시우위엄중。저충정황하,구유고빈솔분변솔적선전불변신호삼수고계기술（ estimation of signal pa-rameters via rotational invariance technique,ESPRIT)적고계효과야실거의의。인차,인입복조제기술,장공빈분량반이지0 Hz병여이려제。동시,인입hilbert변환구성해석신호,이용기단변빈보성해결부빈솔분량문제。진이,제출료기우복조제려파여ESPRIT적이보전동궤전자단조고장검측신방법。방진여실험험증료차방법적유효성。
Broken rotor bar fault is difficult to detect because of the fact that the power frequency component is so close to the side frequency component and the side frequency component is too weak, which is particularly serious in condition of low slip. In this case, even ESPRIT is ineffective. Therefore, a complex modulation technique is intro-duced to remove the power frequency component by shifting it to 0 Hz in frequency domain. Meanwhile, Hilbert trans-form is adoptedto solve the negative frequency problem by its one-sided spectrum characteristic. Finally, a new BRB detection method is presented by combining complex modulation techniques and ESPRIT seamlessly. Simulating re-sults on an induction motor verify the effectness.