بررسي، تحليل و شبيه سازي كوره هاي القايي سري و موازي بر اساس يك مدل واقعي

چكيده انگليسي :

Study analyze and simulation of series and parallel induction furnace in the basis of real model Majid Gholampour Shahaboddini majid gh sh2000@yahoo com Date of Submission 2010 7 21 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran 84156 83111 Degree M Sc Language FarsiSupervisors name Seyed Morteza saghaian nejad saghaian@cc iut ac irAbstract Induction furnace is the most application of induction heating systems An induction furnace is an electricalfurnace in which the heat is applied by induction heating of a conductive medium usually a metal in acrucible placed in a water cooled alternating current solenoid coil The advantage of the induction furnace isa clean energy efficient and well controllable melting process compared to most other means of metalmelting Most modern foundries use this type of furnace and now also more iron foundries are replacingcupolas with induction furnaces to melt cast iron as the former emit lots of dust and other pollutants Induction furnace capacities range from less than one kilogram to one hundred tones capacity and are used tomelt iron and steel copper aluminum and precious metals The one major drawback to induction furnaceusage in a foundry is the lack of refining capacity charge materials must be clean of oxidation products andof a known composition and some alloying elements may be lost due to oxidation Operating frequenciesrange from utility frequency 50 or 60 Hz to 400 kHz or higher usually depending on the material beingmelted the capacity volume of the furnace and the melting speed required Generally the smaller thevolume of the melts the higher the frequency of the furnace used this is due to the skin depth which is ameasure of the distance an alternating current can penetrate beneath the surface of a conductor For the sameconductivity the higher frequencies have a shallow skin depth that is less penetration into the melt Lowerfrequencies can generate stirring or turbulence in the metal A preheated 1 tonne furnace melting iron canmelt cold charge to tapping readiness within an hour Power supplies range from 10kw to 15000 kw withmelt sizes of 20 kg to 30000 kg of metal respectively These furnaces are used in casting industries becauseof the advantages of high speed in increasing metal temperature no environment pollution decreasingmaintenance cost and so on In addition to melting Induction furnaces are used extensively in welding metalhardening forging and surface tempering The end of this project is simulation of series and parallelinduction furnace to expend the results of these simulations to the real furnaces So we introduce inductionfurnaces at first and then explain the fundamental applications of industrial induction furnaces Then wepresent the basic parts of induction furnaces and study the major topologies in industry abbreviately Finallywe simulate a real series induction furnace and parallel induction furnace and show the important waveforms Then we compare the results of simulated parallel furnace and experimental results of a parallel inductionfurnace and study and analyze the analogies and differences of them In simulation in addition to frequencycontrol by PLL we control the rectifier of induction furnace to transfer the maximum power to the load inthis way the power transferred to the load is maximum and the time of warming decreases so efficiencyincreases In this project we use the SIMULINK for the simulation of furnaces Key words induction furnace parallel induction furnace series induction furnace switching frequencycontrol

غلامپور شهاب الديني، مجيد

بررسي، تحليل و شبيه سازي كوره هاي القايي سري و موازي بر اساس يك مدل واقعي

كنترل توان ورودي , كنترل فركانس سوئيچينگ