Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 50, Problem 6RQ
Briefly explain why thyristors have the ability to control large amounts of power.
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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
Magnetic path
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)
State and exolain Grashof's law for four-bar mechanis in detail
step of construction with sutible dimmenstion
Chapter 50 Solutions
Understanding Motor Controls
Ch. 50 - Prob. 1RQCh. 50 - Prob. 2RQCh. 50 - Prob. 3RQCh. 50 - How many layers of semiconductor material are used...Ch. 50 - SCRs are members of a family of devices known as...Ch. 50 - Briefly explain why thyristors have the ability to...Ch. 50 - What is the average voltage drop of an SCR when it...Ch. 50 - Explain why an SCR must be phase shifted.
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