Scenario: Consider a magnetic circuit with a mean length of 0.6 m. A 4x102 turn coil is wound around the left-hand limb. The magnetic circuit is made from silicon steel; core effects may not be ignored. The cross section is uniform and there is a 1.1 mm air gap in the circuit. Find the current required in the coil to give a flux density of 1.40 T in the air gap. The number of turns in the coil is The magnetic field intensity in the core, Ho. is A-t/m. The current in the coil, i, is A. (keep

Scenario: Consider a magnetic circuit with a mean length of 0.6 m. A 4x102 turn coil is wound around the left-hand limb. The magnetic circuit is made from silicon steel; core effects may not be ignored. The cross section is uniform and there is a 1.1 mm air gap in the circuit. Find the current required in the coil to give a flux density of 1.40 T in the air gap. The number of turns in the coil is The magnetic field intensity in the core, Ho. is A-t/m. The current in the coil, i, is A. (keep

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A square magnetic core has a mean length of 43 cm and a cross-sectional area of120cm2. A coil of 200 turns of wire is wound around one of the columns of the core, thewhich is made of a material whose required magnetic field strength is H=115 Aturns/m. a) How much current is required to produce a flux of 0.012 Wb, in the core?b) What is the relative permeability of the core for that current?c) What is the reluctance?
a. If the material is the ideal material, N1I1 = 200, NIA = 100 and NIB = 150 If I am ampersand, what is the flux density in the middle of the air gap? okay? Calculate by drawing the magnetic circuit. b. If the material is not the ideal material (µr), the core material of each winding Find the inductance in terms of parameters c. What is mutual inductance between windings? D. Check the magnetic equivalent circuit of this system that there are no leakage fluxes. draw assuming. New magnetic with leakage fluxes in mind How about a circuit, draw?
For a motor design, you need to design a solenoid coil that produces a magnetic flux density (B) of at least 2000 gauss when a 10 mA current flows through the conductor. Due to space limitations, the coil only can be 10 turns over a 1 cm length. To obtain the needed performance, go to Table 3 and choose a core material for the coil.
An iron-cored choke is designed to have an inductance of 12.5 H when operating at a fluxdensity 3 T, the corresponding relative permeability of iron core is 1500. Determine thenumber of turns in the winding, given that the magnetic flux path has a mean length of 20cm in the iron core and 2 mm in air-gap that its cross-section is 15 cm2
The magnetic circuit shown in Figure P13.11 hastwo parallel paths. Find the flux and flux density ineach leg of the magnetic circuit. Neglect fringing at theair gaps and any leakage fields. N = 1,000 turns,i = 0.2A, lg1 = 0.02 cm, and lg2 = 0.04 cm. Assumethe reluctance of the magnetic core to benegligible.
For the circuit shown in Figure:a. Determine the reluctance values and show themagnetic circuit, assuming that μ = 3,000μ0.b. Determine the inductance of the device.c. The inductance of the device can be modified bycutting an air gap in the magnetic structure. If a gapof 0.1 mm is cut in the arm of length l3, what is thenew value of inductance?d. As the gap is increased in size (length), what is thelimiting value of inductance? Neglect leakage fluxand fringing effects.
a. Find the current I required to establish a fluxφ = 2.4 × 10−4 Wb in the magnetic circuit ofFigure. Here area (throughout) =2 × 10−4 m2, lab = lef = 0.05 m, laf = lbe= 0.02 m, lbc = ldc, and the material is sheet steel. b. Compare the mmf drop across the air gap to thatacross the rest of the magnetic circuit. Discuss yourresults, using the value of μ for each material.
Given a magnetic circuit with a current 2.6A flowing through 205 turns of wire on a core having a reluctance of 125000 At/Wb. Determine the magnetomotive force of the circuit in base units.
A ferromagnetic core with a relative permeability of 1500 is shown in the following figure. The depth of the core is 5 cm. Because of fringing effects, the effective area of the air gaps is 5 percent larger than their physical size. If there are 300 turns in the coil wrapped around the center leg of the core, and if the current in the coil is 1.25 A, find the magnetic flux and the field density in all three legs of the core, as well as the magnetic flux and flux density in the two air gaps.
Q)In steady magnetic fields, can we define a potential function based on the current distribution from which the magnetic fields may be easily determined? Justify your answer.
Find the numerical values of the magnetic field created by the L length wire piece with constant I current flowing through it at the P points shown in the figures below (I=10A, a=20cm)
Consider a ferromagnetic ring (nucleus) that has a mean circumference of 40 cm, 300coiled copper turns and a sectional area of 5 cm2. A current of 2 is appliedA to winding, producing a flux of 1.5 mWb.Determine the permeability of the core material.Determine the relative permeability of the core material.If the ferromagnetic ring has an air gap of 2 mm. Find the required MMFso that the flux density in the gap is 0.5 T.