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L-21(TB)(ET) ((EE)NPTEL)

# L-21(TB)(ET) ((EE)NPTEL) - Module 6 Magnetic circuits and...

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Module 6 Magnetic circuits and Core losses Version 2 EE IIT, Kharagpur

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Lesson 21 Magnetic Circuits Version 2 EE IIT, Kharagpur
Contents 21 Magnetic Circuit (Lesson: 21) 4 21.1 Goals of the lesson ………………………………………………………………. 4 21.2 Introduction ............................................................................................................ 5 21.3 Different laws for calculating magnetic field…………………………………….. 5 21.3.1 Biot-Savart law …………………………………………………………... 5 21.3.2 Ampere’s circuital law …………………………………………………… 6 21.3.3 Application of Ampere’s circuital law in magnetic circuit ……………… 7 21.3.4 Reluctance & permeance ………………………………………………… 9 21.4 B-H Characteristics ................................................................................................ 9 21.4.1 Different zones of B-H characteristic …………………………………… 10 21.5 Analysis of Series magnetic circuit ……………………………………………… 12 21.6 Analysis of Series-parallel magnetic circuit ……………………………………... 13 21.6.1 Important equations ……………………………………………………… 15 21.7 General discussion on solving problems ………………………………………… 15 21.7.1 Worked out example …………………………………………………….. 16 21.8 Answer the following: …………………………………………………………… 19 21.9 Tick the correct choice………..…………………………...……………………... 20 Version 2 EE IIT, Kharagpur

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21.1 Goals of the lesson In this lesson, we shall acquaint the reader, primarily with the basic concepts of magnetic circuit and methods of solving it. Biot-Savart law for calculating magnetic field due to a known current distribution although fundamental and general in nature, requires an integration to be evaluated which sometimes become an uphill task. Fortunately, due to the specific nature of the problem, Ampere’s circuital law (much easier to apply) is adopted for calculating field in the core of a magnetic circuit. You will also understand the importance of B-H curve of a magnetic material and its use. The concept and analysis of linear and non linear magnetic circuit will be explained. The lesson will conclude with some worked out examples. Key Words: mmf, flux, flux density, mean length, permeability, reluctance. A fter going through this section students will be able to answer the following questions. 1. What is a magnetic circuit ? 2. What are linear and non linear magnetic circuits? 3. What information about the core is necessary for solving linear magnetic circuit? 4. What information about the core is necessary for solving non linear magnetic circuit? 5. How to identify better magnetic material from the B-H characteristics of several materials?
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