Lec2 - 341 Energy Conversion - Updated

# Lec2 - 341 Energy Conversion - Updated - 2 Introduction to...

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341 - Electric Machinery Fundamentals MI - 1 2 – Introduction to Machinery Principles (Contd.) Mahesh S. Illindala

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341 - Electric Machinery Fundamentals MI - 2 Objectives Synthesis (creating something, combining elements in novel ways): Formulate an equivalent for parallel magnetic circuit with an air-gap Comprehension (demonstrating understanding of terms and concepts): Discuss Faraday’s Law. Describe production of induced (Lorentz) force and induced voltage on a linear dc machine Application (apply learned information to solve a problem): Apply the Faraday’s law, Lorentz force and induced voltage to solve problems Knowledge (repeating from memory): Define power relationships – electrical and mechanical
341 - Electric Machinery Fundamentals MI - 3 Class Exercise: Formulate the Magnetic Equivalent for this Core Length ‘l o Length ‘l c Area ‘A’ Air Gap m r = 1

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341 - Electric Machinery Fundamentals MI - 4 Fringing Effect in Air Gap Effective area of cross- section of the air gap will be larger than that of the core Study Example 1-2 to better understand the fringing effect on the calculation of total reluctance. Area ‘A’ Area ‘A a A a > A
Induced Voltage from a Time-Changing Magnetic Field (Basis of Transformer Action) e ind = N d dt (Faraday’s Law) If a flux passes through a turn of a coil of wire, a voltage will be induced in the turn of wire that is directly proportional to the rate of change in the flux linkage with respect to time. where e ind is the voltage induced in N turns of the coil and is the flux passing through the turn. (Lenz’s Law) The direction of the voltage buildup in the coil is such that if the coil ends were short-circuited, it would produce current that would cause a flux opposing the original flux change. Negative sign is from Lenz’s law Coil enclosing an increasing magnetic flux Determining the resulting voltage polarity

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341 - Electric Machinery Fundamentals MI - 6 Faraday’s Law Exercise Problem P1-16 Figure P1-2 Figure P1-12 Problem P1-16: The core shown in Figure P1-2 has the flux shown in Figure P1-12. Sketch the voltage present at the terminals of the coil.
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## This note was uploaded on 04/01/2012 for the course ECE 341 taught by Professor Keyhani during the Fall '08 term at Ohio State.

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Lec2 - 341 Energy Conversion - Updated - 2 Introduction to...

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