تشخیص عیب گردش روغن در یاتاقان لغزشی موتور القایی با استفاده از هارمونیک‌های توان لحظه‌ای

نویسندگان

1 عضو هیئت علمی دانشگاه زنجان

2 فارغ التحصیل کارشناسی ارشد

چکیده

چکیده: عیب گردش روغن در یاتاقان­ لغزشی اگر به موقع تشخیص داده شود می­توان از آثار مخرب آن جلوگیری کرد. در این مقاله پس از توصیف عیب مذکور، فرکانس هارمونیک­های ناشی از آن در شکل موج توان لحظه­ای موتور القایی به روش تحلیلی تعیین می­شود. سپس با استفاده از تابع فاصله هوایی مناسب، از روش تابع سیم­پیچ برای شبیه­سازی موتور القایی قفس­ سنجابی با عیب گردش روغن یاتاقان استفاده می­گردد. ترسیم طیف فرکانس توان لحظه­ای موتور با استفاده از نتایج شبیه­سازی، ایجاد هارمونیک­های تعیین­شده را تأیید می­کند. این­گونه هارمونیک­ها در توان لحظه­ای یک موتور القایی فعال بر خط لوله انتقال نفت نیز مشاهده می­شوند که تحلیل ارتعاشات حاکی از وجود عیب گردش روغن در یاتاقان آن است. در خاتمه با توجه به بزرگی دامنه هارمونیک­ها و حساسیت آن­ها به نوع عیب، شدت عیب، سطح بار موتور و عدم تعادلی ولتاژهای سه فاز استاتور، مناسب­ترین دامنه هارمونیک به­عنوان شاخص عیب گردش روغن با استفاده از شبیه­سازی انتخاب می­شود. 

کلیدواژه‌ها

عنوان مقاله [English]

Oil Whirl Fault Detection in Sleeve Bearing of Induction Motor by Using Instantaneous Power Harmonics

چکیده [English]

Abstract: Harmful impacts of oil whirl fault in sleeve bearing can be avoided by early detection of the fault. In this paper, after describing the oil whirl fault, an analytic approach is applied to determine frequency of the harmonics produced by the fault in instantaneous power waveform of induction motor. Then, using appropriate air gap function, winding function approach is used for simulating squirrel cage induction motor with bearing oil whirl fault. The instantaneous power spectrum, plotted using simulation results, approves creation of the proposed harmonics. These harmonics are also evident in instantaneous power of an induction motor that operates on oil pipe line, where vibration analysis shows presence of oil whirl fault in its bearing. Finally, the most appropriate harmonic as the oil whirl fault index is selected using simulation by considering their relative amplitudes as well as their sensitivity to the fault type, fault degree, motor load level and three-phase unbalance of the stator voltages.

کلیدواژه‌ها [English]

  • Keywords: Induction motor
  • sleeve bearing
  • oil whirl fault
  • instantaneous power harmonics

مراجع

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