EBK ELECTRIC MACHINERY
5th Edition
ISBN: 9780100253919
Author: Chapman
Publisher: YUZU
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Chapter 1, Problem 1.16P
The core shown in Figure P1-2 has the flux
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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.
Consider the magnetic circuit in figure. A current of (3A) flowsthrough 200 turns of wire around a core of cross sectional aea of10-3 m2 and a relative permeability of 5000.a) Determine the magnetic flux in each legb) Determine the magnetic field intensity in the air gapc) Determine the magnetic force on the across the air gap
The eddy current loss of a given solid core is 80 W at 50 Hz. What would be the loss of 60 Hz if the core flux density remained the same at the two frequencies. Answer: 115.2 W
Use formula: Pe=ke f²
Chapter 1 Solutions
EBK ELECTRIC MACHINERY
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Hw1-6: Derive the equation for rms core flux of ideal ac magnetic circuit using Ohm's of magnetic circuits. Explain the result.arrow_forwardDefine the following: Flux density Coercive force Residual magnetism Saturationarrow_forwardThe magnetic circuit of Figure shown has current 10 A in the coil of 1800 turns. Assume that all branches have the same cross section of 2 cm^2 and that the material of the core is iron with μr = 1500. Calculate magnetomotive force for the core.arrow_forward
- Consider the magnetic circuit shown in Figure T14.4. The core has a relative permeability of 1500. a. Carefully estimate the flux density in the air gap. b. Determine the inductance of the coil.arrow_forwardDetermine the emf generated by a 4-pole simplex lap wound armature having 300 conductors running at 900 rpm. The flux per pole is 50 mWb (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)arrow_forwardA square magnetic core has a mean path length 55cm and x-sectional area of 150cm2. A 200 turns coil of wire is wrapped around one leg of the core. The core is made of the material having relative permeability 3980. Find • How much current is required to produce 0.012 Wb of flux in the core • Calculate the reluctance and magnetomotive force.arrow_forward
- i. Calculate the current that required to produce a flux density of 0.5 T in the central leg of the core. ii. Calculate the current that required to produce a flux density of 1.0 T in the central leg of the core? Is it twice the current in Q1(b) (i). iii. Calculate the reluctances of the central and right legs of the core under the conditions in Q1(b) (i). iv. Calculate the reluctances of the central and right legs of the core under the conditions in Q1(b) (ii). v. Explain the conclusion that you can make about reluctances in real magnetic cores.arrow_forwardThe 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.arrow_forwardUsing figures (a) and (b), a magnetic flux density of 0.1 Wb in the air gap Determine the current I in the coil with 200 turns required to producearrow_forward
- An iron ring of mean length 100 cm with an air gap of 2 mm has a winding of 500 turns. The relative permeability of iron is 600. When a current of 3 A flows in the winding, determine the flux density. Neglect fringing.arrow_forwardAn iron-cored choke is designed to have an inductance of 12.5 H when operating at a flux density 3 T, the corresponding relative permeability of iron core is 1500. Determine the number of turns in the winding, given that the magnetic flux path has a mean length of 20 cm in the iron core and 2 mm in air-gap that its cross-section is 15 cm2. * ROUNDING OFF is ALLOWED only in the final answers expressed up to FIVE (5) DECIMALPLACES.arrow_forwardAn autotransformer is shown in Figure P14.68. Assume that all of the flux links all of the turns and that negligible mmf is needed to establish the flux. Determine the values of I1, I2, I3 and V2.arrow_forward
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