lecture-11-21

# Lecture-11-21 - ME-340 Tentative class forecast Week 11/14 Feedback for final stretch/exam Finalize Ch 14 Ch 15(Electromagnetism Week 11/21 Ch 15

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11/19/2011 1 ME-340 Circuits & Mechatronics Lecture # 35 2010.11.21 Tentative class forecast Week 11/14 Feedback for final stretch/exam Finalize Ch 14 Ch 15 (Electromagnetism) Week 11/21 Ch 15 Week 11/28 Parts of Ch 16, 17 Quiz on Chs. 14, 15 Final exam on Th 12/8 7-10pm (Chs. 16, 17) 2 New Problem Homework (Due We 11/30 in class) Hambley 5 th Edition, Ch. 15, Problems Magnetic materials: 15.53, 15.54 Ideal transformers: 15.65, 15.66 3 Reminder Homework Problems (Due We 11/23 in Class) Hambley 5 th Edition, Ch. 15 Problems: Magnetic fields: 15.11, 15.15, 15.21 Magnetic circuits: 15.28, 15.34 4

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11/19/2011 2 Review Session No review session after class this Wednesday Instead, review session on Wednesdays, 2-3 ETC 2.136 5 Movie 6 http://www.youtube.com/watch?v=y-54gBLwK3s Recap last week 7 Magnetic Fields, Flux & Flux Density Source of magnetic field: electric charge in motion Magnetic fields surround permanent magnets & currents Field visualized as lines of magnetic flux
11/19/2011 3 Right-hand Rule B u f q f quB sin   Lorentz Force: Charges Moving in Magnetic Fields B = magnetic flux density Lorenz magnetic force Magnetic Flux 11 A B d A B = Magnetic flux density Φ = Magnetic flux Lines of flux indicate intensity & direction of B field A B d A N Flux Linkages N : number of turns in coil B : magnetic induction or flux density [T] Tesla = Wb m -2 : magnetic flux [Wb] Weber = Volt sec A : area of flux linkage accumulation Λ: Weber-turns dS S B

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11/19/2011 4 Faraday & Lenz Laws Faraday’s law: voltage e induced in coil by change in flux linkage , caused by: Field B = B (t) changes with time Coil moves w.r.t. field, changing area A dt d e N N A B
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## This note was uploaded on 02/07/2012 for the course M E 340 taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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Lecture-11-21 - ME-340 Tentative class forecast Week 11/14 Feedback for final stretch/exam Finalize Ch 14 Ch 15(Electromagnetism Week 11/21 Ch 15

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