Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 5RQ
Define the following terms:
Flux density
Permeability
Reluctance
Saturation
Coercive force
Residual magnetism
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A two-legged magnetic core with an air gap is shown in Fig.1. The depth of is 5 cm, the length of the
airgap is 0.08 cm, and the number of turns on the coil is 800. The magnetization curve of the core
material is shown in Fig.2. The magnetic field density in air gap is 0.7 T.
What is the total MMFin A-Turns required to magnetize both the iron core and airgap?
Nas deasiy B(T
Question 2 Calculate the amount of DC current required for the magnetic circuit given below to generate a
flux density of 1.0 T in the airgap. The details are
Number of turns, N = 400
The core is made up of steel, the B-H characteristic has been given below
The magnetic core length, le = 500 mm
The airgap length, Ig = 2 mm
The cross-sectional area of the core, Ag = 100 mm²
Neglect leakage and fringing.
Core
Cross-sectional
i(1)
area
as
Air gap
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length
Figure 1
2.0
1.8
B-H Curves for Various Metals
Steel
1.6
1.4
Magnetic
Saturation
1.2
1.0
0.8
Iron
근 0.4
Air
0.2
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Magnetic Field Strength - H (A/m)
Figure 2
Flux Density - B (T)
A relatively soft and ductile magnetic material from room temperature to 1414
degrees F.
O Austenite
OFerrite
Cementite
Chapter 1 Solutions
Electrical Transformers and Rotating Machines
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Ch. 1 - The south pole of one magnet is brought close to...Ch. 1 - How can the polarity of an electromagnet be...Ch. 1 - Define the following terms:
Flux...Ch. 1 - A force of 1 ounce is equal to how many dynes?
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