Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 5SQ
To determine
Explain the effect if the contacts of zero-speed switch are adjusted to open very late.
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1°
⑤
Aa
"Human-written solution required"
2. Using the characteristics of Fig. 6.11, determine ID for the following levels of VGs (with
VDS > VP):
a. VGs = 0V.
b. VGs=-1 V.
c. VGs -1.5 V.
d. VGS
-1.8 V.
e. VGS = -4 V.
f. VGs=-6V.
3. Using the results of problem 2 plot the transfer characteristics of ID vs. VGS-
4. a. Determine Vps for VGs = 0V and Ip = 6 mA using the characteristics of Fig. 6.11.
b. Using the results of part (a), calculate the resistance of the JFET for the region Ip = 0 to
6 mA for VGs =0V.
c. Determine Vps for VGS = -1 V and ID = 3 mA.
d. Using the results of part (c), calculate the resistance of the JFET for the region ID = 0 to
3 mA for VGs -1 V.
e. Determine Vps for VGs = -2 V and ID = 1.5 mA.
f. Using the results of part (e), calculate the resistance of the JFET for the region ID = 0 to
1.5 mA for VGS-2 V.
g. Defining the result of part (b) as ro, determine the resistance for VGs -1 V using
Eq. (6.1) and compare with the results of part (d).
h. Repeat part (g)…
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4. a. Determine VDs for VGS = 0 V and ID = 6 mA using the characteristics of Fig. 6.11.
b. Using the results of part (a), calculate the resistance of the JFET for the region ID = 0 to
6 mA for VGS = 0 V.
c. Determine VDs for VGS = -1 V and ID = 3 mA.
d. Using the results of part (c), calculate the resistance of the JFET for the region ID = 0 to
3 mA for VGS = -1 V.
e. Determine VDs for VGS = -2 V and ID = 1.5 mA.
f. Using the results of part (e), calculate the resistance of the JFET for the region ID = 0 to
1.5 mA for VGS = -2 V.
g. Defining the result of part (b) as ro, determine the resistance for VGS = -1 V using
Eq. (6.1) and compare with the results of part (d).
h. Repeat part (g) for VGS = -2 V using the same equation, and compare the results with part (f).
i. Based on the results of parts (g) and (h), does Eq. (6.1) appear to be a valid approximation?
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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