Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 50, Problem 7SQ
To determine
Explain the necessity of resistor R in figure 50-4(B).
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4,57. Consider a discrete-time LTI system whose system function H(z) is given by
Z
H(z)
Z-
(a) Find the step response s[n].
1
|z|>
2
(b) Find the output y[n] to the input x[n] = nu[n].
Ans. (a) s[n] = [2-()"]u[n]
(b) y[n]=2[()" + n − 1]u[n]
-
4.56. Consider the system shown in Fig. 4-10.
(a) Find the system function H(z).
(b) Find the difference equation relating the output y[n] and input x[n].
Ans. (a) H(z) =
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-1
1+a,z+azz-2
(b) y[n]+a, y[n − 1]+a₂y[n-2]= box[n] + b,x[n − 1] + b₂x[n-2]
x[n]
a₂
b₂
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b₁
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y[n]
Fig. 4-10
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1-Av,AI,ZIN,Zo and Avs. if hie-1.8KQ, hre=2*10-4, hfe-120 and hoe-25μs.
2-S(Ico),S(VBE),S(ẞ) using T₁ as the temperature at which the parameter values are s
and ẞ(T2) as 20% more than ẞ(T1).
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3-Determine the net change in Ic if a change in operating condition results in Ico increa
0.2μA to 10uA,VBE drops from 0.7 to 0.6 and ẞ increase 20%.
4-Find the change in Ic if the temperature increase from 20 to 80 [C]
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3 kohm
220 kohm
20 MF
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Electric Motor Control
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