کنترل زاویه شار به‌منظور بهبود بازده موتورهای القایی

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی برق - دانشگاه علم و صنعت ایران

چکیده

امروزه موتورهای القایی به‌طور گسترده‌ای در صنعت، به‌وسیله درایوهای الکتریکی مورد استفاده قرار می­گیرند. یکی از پرکاربردترین درایوهای الکتریکی،کنترل برداری است.کنترل برداری در بارهای سنگین عملکرد قابل قبولی دارد و مقدار شار روتور در بارهای سنگین همان مقدار نامی است. اما در بارهای سبک، استفاده از کنترل برداری منجر به کاهش بازده خواهد شد. در واقع، در بارهای سبک مقدار شار نامی روتور نیاز نیست. موتورها اغلب در باری غیر از بار نامی مورد استفاده قرار می­گیرند. یکی از عواملی که موجب قرار گرفتن موتور در باری به غیر از بار نامی می­شود، انتخاب بالادست موتور است. در این مقاله سعی خواهد شد با کنترل زاویه­ی بین جریان استاتور و شار روتور که بر محور d قرار دارد(زاویه شار)، مقدار بازده موتور القایی، به­خصوص در بارهای سبک، بهبود یابد. در روش پیشنهادی، مقدار زاویه شار در بارهای سبک در یک مقدار ثابت، که به برخی از پارامترهای موتور وابسته است؛ کنترل خواهد شد. روش پیشنهادی به سادگی قابل اجراست، حجم محاسباتی اندک دارد و بازده موتور القایی را در بارهای سبک به مقدار قابل‌ملاحظه‌ای افزایش خواهد داد.

کلیدواژه‌ها

عنوان مقاله [English]

Flux Angle Control to Improve the Efficiency of Induction Motors

نویسندگان [English]

  • M. R. Mohebbi
  • D. Arab Khaburi
  • M. Khosravi
Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Today, induction motors are widely used in the industry by electric drives. Vector control is one of the commonly used electric drives. Vector control has a good performance in heavy loads and the amount of rotor flux in these loads is the same as the nominal value. But in light loads, using vector control will result in a reduction in efficiency. In fact, in the light loads, the value of the rotor rated flux is not required. Motors are often used at a load other than the rated value. One of the factors that causes the motor to be placed in a load other than the rated load, is the oversized selection. In this paper, it will be tried to improve the induction motor efficiency, especially in light loads, by controlling the angle between the stator current and the rotor flux which is located on the d-axis (flux angle). In the proposed method, the value of the flux angle in light loads is controlled at a constant value, which is dependent on some of the motor parameters. The proposed method could be simply implemented, has a low computational burden and will considerably increase the efficiency of the induction motor in light loads.

کلیدواژه‌ها [English]

  • Flux angle control
  • Vector control
  • Induction motor
  • Efficiency improvement

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