Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 59, Problem 10SQ
What are the probable causes of a noisy magnet?
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The short-circuit test has been carried out on a single-phase transformer of 2500kVA,50kV/10kV, with the following results: 4000V, 50A , 50000 WIt is known that the transformer has a vacuum current equal to 2% and its efficiency at full load fp=1 is 97.5%.
Calculate:
A. Parameters of the excitation branch. Rfe, JXm, Pob. Relative voltage drops. εcc, εrcc, εxcc
Magnetic Field Analysis of a Helical Coil
In this lab you will analyse the inductive coil structure shown in Figure 1. It comprises a solid
round copper wire of radius a = 0.8mm, wound into a cylindrical spiral having N = 20 turns, major
radius R = 10mm and an axial pitch p = 2mm. The coil is excited by a dc current of 1A.
R
P
1
(a) Analytic Calculations
Figure 1: Helical Air-cored Coil
Using the expressions developed in the class, estimate the magnetic flux density B at the centre of
the coil. Recall from EN1216 that for a long solenoid, the flux density is given by:
HONI
B
l
As we saw in the class (see section 4) a modified expression can also be derived that eliminates
the need for the 'long' solenoid assumption:
R
α1
Р
â
B =
HONI
2l
(cosa₂-cosα1)
1
Compare the results obtained using equations (1) and (2) and state which solution you would
expect to give the best approximation to the real coil behaviour.
I need immediate help with my SIMULINK model. I don't know why but no matter how much a increase or decrease Kc or TI, the graphs are the same. C'A0(s) is the disturbance going through G'D(s). Please check my transfer function blocks by taking the laplace transform of the equations. Any suggestions is welcome greatly! thanks
Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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