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3000Chapter12 - Chapter 12 Magnetic Circuits 1 Objectives...

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1 Chapter 12 Magnetic Circuits

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2 Objectives Demonstrate an understanding of the principles of magnetism and electromagnetics. Show how a solenoid is constructed and how it operates. Calculate the magnetic flux, magnetomotive force, and flux density in a closed core. State the relationships among reluctance, absolute permeability, and relative permeability. Explain the relationship between magnetic field intensity and flux density.
3 Objectives Read a B-H curve and find the linear and saturation regions on the curve. Explain why core saturation is generally detrimental to solenoid performance.

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4 12-1 Magnetism and Electromagnetism
5 12-2 Flux

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6 12-3 Flux Density B = Φ / A B = flux density in webers/m 2 (Wb/m 2 ) or teslas (T) Φ = flux in webers (Wb) A = cross-sectional area in meters 2
7 12-4 Magnetomotive Force mmf = N I mmf = magnetomotive force in ampere-turns (A-t) N = number of turns of wire (t) I = coil current in amperes (A)

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8 12-5 Reluctance Φ = mmf / R = NI / R
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