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SUPERVISOR
Hamid Reza Karshenas
حمیدرضا کارشناس (استاد راهنما)
 
STUDENT
Ali Mohammadi
علی محمدی نجف آبادی

FACULTY - DEPARTMENT

دانشکده مهندسی برق و کامپیوتر
DEGREE
Master of Science (MSc)
YEAR
1391

TITLE

Design & Construction of A 250KW Parallel Resonant Induction Furnace
This thesis is concerned with analysis and design of a power supply with parallel resonant configuration for use in induction furnace applications. Induction heating takes advantage of the losses generated in conductive materials by the eddy currents when exposed to alternating magnetic field. The first types of alternating magnetic field were obtained using motor-generator sets and spark-gap generators. The advances made in late 60's to manufacture reliable semiconductors caused the motor-generators to be replaced by solid-state converters. Nowadays, most power supplies for induction heating applications are based on high-power semiconductor technologies and use SCR, IGBT and MOSFET devices. A popular topology used in high power static converters is parallel resonant topology, also known as current source topology. In this topology, the inverter generates high-frequency, high-current square-wave output and feeds a parallel resonant tank consisting of a capacitor and induction coil. The induction coil contains the work piece to be heated or melted. This coil, along with the work piece, is usually modeled by a series RL circuit. The resistor in this circuit represents the losses in the work piece. In this thesis, the characterization of the inductor-work piece system is performed. A model is obtained to understand the load's behavior based on analytical methods. The fundamental expressions and graphs governing the heating mechanism caused by eddy currents are studied. These expressions are particularly become complex in the case of ferromagnetic materials in which the B-H characteristic is highly nonlinear. Consequently, the heat generation mechanism also become more complicated. The simulation of a parallel resonant converter is presented in details. Simulation waveforms are shown and discussed. Expressions governing the operation of parallel resonant circuit and the relationship between various parameters are discussed in details. The design and implementation of a 250 kW power supply is presented. Various experimental waveforms are shown. Keywords: Induction , Parallel Resonant
کوره های القایی به عنوان یکی از محصولات خاص بین رشته ای در زمینه مهندسی برق محسوب می‌شوند.انواع منابع تغذیه ساخته شده و کاربردهای مختلف این کوره ها،باعث احساس نیاز به بررسی جامع عملکرد این کوره ها از منظر مهندسی برق شده است. تکنولوژی ساخت منابع تغذیه این کوره‌ها به سرعت طی قرن اخیر پیشرفت کرده است. امروزه با پیشرفت عناصر نیمه هادی و دیگر عناصر مدار های الکتریکی، امکان ساخت و طراحی گونه های مختلف منابع تغذیه سوییچینگ در رنج فرکانس 50 هرتز تا 500 کیلو هرتز و رنج توان 1 کیلووات تا چند ده مگاوات فراهم آمده است. این منابع تغذیه به خاطر بازده بالا تر، ایمنی بیشتر، حجم کمتر و قیمت کمتر جایگاه خود را در بین تقریبا تمامی کاربرد ها پیدا کرده اند.پایان نامه حاضر ضمن بررسی مبانی تئوری ساخت این منابع تغذیه،به طراحی و ساخت یک نمونه کوره پرداخته است. . کلمات کلیدی: 1-کوره القایی 2- ذوب 3-آهنگری 4-رزونانس

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