Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 1, Problem 1.2Q
What is Ampere’s law?
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Please write all the
Formulas clearly for each case first,
then solve the question by hand on
paper and send a clear photo of the
solution. Thanks a lot
Power Electronics
Q1) For the circuit shown in Fig (1).
(a) Draw the output voltage and load current waveforms if the load is inductive. Explain the
working of each device.
(b) If Vs 220V, load resistance is 10 2 and output voltage frequency is 50Hz.
1. What is the rms value of the load voltage?
2. Obtain Fourier series expression of the output voltage up to 7th order harmonic.
3. Draw the frequency spectrum of the output voltage wave up to 7th order harmonic.
T₁
D₁
D
Vo
T₁
D4
Fig 1
Load
T₂
D
Please write all the formulas clearly for
each case first, then solve the question
by hand on paper and send a clear
photo of the solution. Thanks a lot
6 A three-phase transistor voltage-source inverter supplies a three-phase load,
as shown in Fig.8.41. The load consists of star connected resistance of
10 in each phase. The inverter supply voltage is 200V d.c. and each
inverter switch conducts for 120°.
(a) Sketch the switching signals for the six transistors.
(b) Sketch the line-to-neutral voltage for one complete cycle of the
output voltage.
(c) Sketch the line-to-line voltage for one complete cycle of the
output voltage.
(d) Calculate the rms values of the first five harmonics in the line-
to-line output voltage, including the fundamental.
(e) Calculate the rms values of the first five harmonics in the line-
to-neutral output voltage, including the fundamental.
[Ans: (d) VL-L=244.95 V, (e) Vph = 141.42 V]
Q1
Q3
Q5
Vdc
200V
b
Q4
Q6
Q2
Fig.8.41.
120°
conuction
ww
102
w
1052
ww
n
1052
Please write all the
Formulas clearly for each case first,
then solve the question by hand on
paper and send a clear photo of the
solution. Thanks a lot
Tent waveforms if the
Q4) A three-phase inverter supplies a 3-phase load, as shown in Fig (2). The load consists of star
connected resistance of 1002 in each phase. The inverter supply voltage is 200 V dc, and each
inverter switch conducts 180°.
(a) Sketch the switching signals for the six transistors.
(b) Sketch the line-line voltage for one complete cycle of the output voltage
(c) Sketch the line-line voltage for one complete cycle of the output voltage
(d) Calculate the rms values of the first five harmonics in the line-line output voltage,
including the fundamental.
(e) Calculate the rms values of the first five harmonics in the line-neutral output voltage.
including the fundamental.)
Vac
200V
Q1
Q3
Q5
B
Q6
b
Q2
ww
10Ω
Fig2
3
1092
ww
1092
Chapter 1 Solutions
Electric machinery fundamentals
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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