EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 46, Problem 3SQ
To determine
Sketch the line diagram of a DC motor using a counter emf controller with three steps of acceleration.
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4-3) Similar to Lathi & Ding, Prob. P.4.2-3
For a DSB-SC signal g(t) = 2m(t)cos(4000) transmitting each of the following messages,
(a) write an expression for G(f) and
(b) sketch the magnitude spectrum |G(f)], specifying the FWHM (full width at half-maximum) of any spectrum
peaks.
a)
m(t) = sinc²(100-50л)
b)
m(t)=400e-80,000r²
4-2) Lathi & Ding, similar to problem 3.8-5.
For the filter shown below, with an input signal whose PSD is given by S⭑(f) = П(0.25лf):
(a) Find the total input power;
(b) Find the transfer function H(f);
(c) Find the power spectral density (PSD) of the output signal;
(d) Find the total output power of the signal
500 ΚΩ
d
1 µF
dt
y(t)
4-1) Distortionless transmission
A bandpass signal g(t) of bandwidth B = 2000 Hz centered at f= 5.0x104 Hz is passed through the RC filter below
with RC = 4.0x105 radians/s. If over the passband, a variation of less than 2% in both amplitude response and
time delay is considered to be distortionless transmission, would g(t) be transmitted without distortion? Find the
approximate magnitude response and the approximate time delay for the signal.
R
w
g(1)
y(t)
Chapter 46 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 46 - Prob. 1SQCh. 46 - What physical characteristic distinguishes between...Ch. 46 - Prob. 3SQCh. 46 - What protection is available from excessive...Ch. 46 - How does a field accelerating relay prevent...Ch. 46 - Prob. 6SQCh. 46 - How may more steps of acceleration be added to a...Ch. 46 - Prob. 8SQ
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