EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Question
Chapter 45, Problem 1SQ
To determine
Explain why small DC motors can be connected directly across the line for starting.
Expert Solution & Answer
Explanation of Solution
Small DC motors can be started by connecting directly across the line with the help of a switch or a connector. It does not cause any damage because the motor can attain full speed very quickly due to small amount of rotor’s inertia and friction. Also a high starting current will decrease very quickly due to the fast increase in the counter-electromotive force.
Conclusion:
Thus, a motor that can be connected directly across a line for starting is explained.
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Students have asked these similar questions
The first photo is question 1
a) Write down the order of the transfer function in each of the following cases. Assume that
there are no terms in the numerator that will cancel terms in the denominator.
10
H(s)
H(s)
=
s+1
5
(s+3)(s—. 4)
4s1
5
H(s)
=
H(s)
-
83 +1
s27s
6
H(s)
H(s)
=
s(s²+4s)
2s27s+1
84583882 +3s+2
H(s)
83 +8
s+1
=
H(s)
s34s26s+5
s52s4383 + 4s2 +5s +6
Question 5 (
A system is found to have zeros of -3 and poles of 4, and -2. The system also has a gain of
4. Write out the corresponding transfer function.
Question 6.
A system has a transfer function of
What is the gain, K, of the system?
Question 7 (
A system has a transfer function of
H(s)
-
4
8+5
H(s):
=
4
8 +5
A step input of size 3 is applied to the system at time zero (Since we're dealing with transfer
functions, x(0) is also zero at time zero).
a) [10] What is the response ✗(s) of the system?
b) [10] Derive the time dependent solution, x(t), of this response
Chapter 45 Solutions
EBK ELECTRIC MOTOR CONTROL
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