A magnetic core with an air gap is shown below. For a relative permeability is 3500, and the space free permeability is 4π×107 H/m, find the reluctance of the gap, assuming a 4 percent increase in the effective air-gap area to account for fringing. 5 cm gap 0.15 cm 5 cm 40 cm 5 cm 20 cm N Answer: Rgap = core depth = 10 cm KA.t./Wb. 15 cm

A magnetic core with an air gap is shown below. For a relative permeability is 3500, and the space free permeability is 4π×107 H/m, find the reluctance of the gap, assuming a 4 percent increase in the effective air-gap area to account for fringing. 5 cm gap 0.15 cm 5 cm 40 cm 5 cm 20 cm N Answer: Rgap = core depth = 10 cm KA.t./Wb. 15 cm

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...

See similar textbooks

Similar questions

A long wire is folded to form a semicircle of radius b as shown *b.P in figure. Find the magnetic flux density B at point P (the center of the semicircle).
The x-y plne seporotes two maanetic media with magnetic permeabilities u, nd N2.f there is no surfoce arrent at the inerfoce ord the mognetie field in medium I is HI Ê Hx + G Hey + ê Hiz find : a) He b) O, ond Or c) Eualua te He, 0,,nd 2 for Hix =4 IAIM/, Hiy =0, Hie - 8 Nz =9Mo CA Im) Ni - Mo nd HI Ni x-y plane Me
Figure shows a circuit and a conducting rod. A conducting rod moves with a constant velocity vperpendicular to a circuit with a current I=2.82sin(??)
FIGURE 5-15 A closely wound toroidal coil (Example 5-8).
Reluctance of core material (R) Cross-sectional area (A) 1520 Number of turns FUCCE Fig. 6 Magnetic coil Flux (6) Length around core (1)
1. a) A magnetic circuit is formed using an iron core with relative permeability 1000 and single air gap, and has the following parameters: cross-sectional area: Ac =1.6 × 10-3 m²; mean core length lc = 0.8 m; air gap length g = 2 x 10³ m. A coil of 100 turns is wound on the iron core. i) Calculate the reluctance of the core Rc and that of the gap RG neglecting the effects of fringing fields at the air gap and leakage flux from the coil.
Consider the magnetic circuit of with the dimensions of Problem 1.1. Assuming infinite core permeability, calculate (a) the number of turns required to achieve an inductance of 12 mH and (b) the inductor current which will result in a core flux density of 1.0 T. N turns Core: mean length 4. area A permeability Air gap R
A straight wire carrying a 2.88-A current is placed in a uniform magnetic field of magnitude 0.274 T directed perpendicular to the wire. Find the magnitude of the magnetic force on a section of the wire having a length of 13.9 cm. N
A conductor of length 100 cm moves at right angle to a uniform field flux density of 1.5 Wb/m with a velocity of 50 m/s. The e.m.f. induced in the conductor will be?
4- The iron is of infinite permeability (u>00). For: Ri = 5.8 cm, Ro = 7.0 cm, depth3D4 cm, g 0.35 cm Calculate: a. the mean core length l and the core cross-sectional area Aç. b. the reluctance of the core Rc and that of the gap Rg. Ro R N turns
A conductor of length I metre moves at right angles to a uniform magnetic field of flux density 1.5 Wb/m with a velocity of 50 metre/second. Calculate the e.m.f. induced in it. Find also the value of induced e.m.f. when the conductor moves at an angle of 30° to the direction of the field.
Q2. A toroidal core that is made of iron and having relative permeability of µ, = 5000. The mean path length of the core, le is 37.6 cm while the cross-sectional area of the core is 0.1256 cm². The fringing effect and leakage flux are to be negligible. The number of turns of the coil, N¡ is 400. If there is an airgap of 5 mm and magnetic flux density at air gap is 0.25 T, (i) Draw equivalent magnetic circuit analogy of the core. (ii) Calculate the current required to energize the core. (iii) Determine the magnetizing strength, Hg in the air gap. mark (iv) If flux density in the air gap is reduced to half, find the new current flowing in the coil to energize the core. (v) If there is no airgap and the current value is similar as in (ii), what is the flux density in the core ? (Note: lo = 4n x10-7 H/m, Bmax = 1.5 T).