Fundamentals of Energy Systems HW 4 Q6 6. Answer the following questions.1. Explain why a magnetic device should not be exposed to over-voltages.2. If the peak ac voltage applied to a magnetic device is doubled (withoutchanging the frequency), how would the hysteresis and eddy current losseschange?3. If both the peak and frequency of the ac voltage applied to a magnetic device are doubled, how would the hysteresis and eddy current losses change?4. If the frequency of the ac voltage applied to a magnetic device is doubled(without changing its peak voltage), how would the hysteresis and eddycurrent losses change?3

1. . Over voltage in a magnetic device leads to high core and copper losses and also causes the…

Answered: 6. Answer the following questions. 1.…

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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1. What is the relationship between voltage and current when there is saturation in the magnetic circuit? 2. When there is no saturation in the magnetic circuit, what is the relationship between voltage and current? 3. Briefly explain what caused the saturation in the magnetic circuit. 4. What happens to alternating current, alternating current, and alternating magnetic flux in a magnetic circuit when frequency increases? 5. When a magnetic circuit is saturated, explain two solutions that can be used so that the magnetic circuit is no longer saturated.
A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core is
3. How does the concept of hysteresis affect the performance of magnetic materials in electrical applications? please don't use Al solution
(a) Explain briefly what is fringing effect and leakage flux. (b) A ferromagnetic core is shown in Figure 1. The depth of the core is 10 cm. The other dimensions of the core are as shown in the figure. By assuming the magnetic leakage to be negligible and relative permeability of the core is 800. Calculate the total reluctance and find the value of the current that will produce a flux of 0.01 Wb. With this current, calculate the flux density at the top of the core 20 cm 40 cm 10 cm, 30 cm 500 turns 30 cm 30 cm Figure 1
A certain magnetic circuit may be regarded as consisting of three parts, A, B and C in series, each one of which has a uniform cross-sectional area. Part A has a length of 300 mm and a cross- sectional area of 450 mm². Part B has a length of 120 mm and a cross-sectional area of 300 mm². Part C is an airgap 1.0 mm in length and of cross-sectional area 350 mm². The flux in the airgap is 0.35 mWb. Neglect magnetic leakage and fringing. The magnetic characteristic for parts A and B is given by: H (A/m) 400 560 800 1280 1800 B (T) 0.7 0.85 1.0 1.15 1.25 Calculate: i. The reluctance of each part, that is, of Part A, Part B, and Part C ii. The total reluctance of the magnetic circuit. iii. The total m.m.f.
For the electromagnet of Figure-a. Find the flux density in the core.b. Sketch the magnetic flux lines and indicate theirdirection.c. Indicate the north and south poles of the magnet.
What is the primary characteristic of an eddy current in a conductor exposed to a changing magnetic field? A) Eddy currents flow in closed loops within the conductor and can cause energy loss in the form of heat. B) Eddy currents produce a magnetic field that opposes the applied external magnetic field. C) Eddy currents are negligible in conductive materials with high magnetic permeability. D) Eddy currents are directly proportional to the resistivity of the material.
. An iron core has a cross-sectional area of 10-3 square meter and mean circumference of 1 meter. The relative permeability of the material is 500 and the number of turns is 200. Determine the current required to set up a flux of 0.001 weber. a. 7.54 A b. 7.96 A c. 8.19 A d. 8.47 A
The applied MMF to a simple magnetic circuit is 350AT. It was found that the resulting magnetic field denstiy is 0.7 Wb/m2. The average length of this magnetic circuit is 1.64ft and its cross-sectional area is 4cm². What is the relative permeability of the magnetic material of the core?
A 4-pole wave wound armature has 120 conductors and runs at 1000 rpm. If the flux per pole is 40 mWb, the emf generated is? (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)
1.Consider the magnetic core below.All dimensions are shown on the figure. The core is made up of legs with 2 different cross-sectional areas.The depth of core is 10cm.The relative permeability of the core is 2000. The current in the magnetising coil is 1 A. The number of turns of the coil is 2000.Calculate: (i)the reluctances and draw the magnetic circuit (ii)the flux in the core (iii)Flux densities B and field intensities H in legs having different cross-sectional areas. (iv)Verify Ampere's Law. Depth: 10 cm I=1A 20cm 2000 Turns 65cm 15cm 15cm 50cm 15cm ndo un of

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