Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 2, Problem 9RQ
To determine
The reason for using a circle to denote a coil in a schematic of motor control.
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Q2(15 Marks): From Fig. 2, Determine
(a) mass equivalent in term x2, (b)
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x2. Note: (1) J Cylinder =
mcr?
J link
(2)
2
3
Pulley, mass moment of
inertia J
Rigid link 1 (mass m₁),
rotates with pulley.
about O
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Adherence to the symbols as in the question
152 153
xx(1)
Fig. (2)
m
k₁
nimmunizmu
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Q3-B (7 Marks): A mass (m) is suspended from a spring of stiffness 4000 N/m and is
subjected to a harmonic force having an amplitude of 100 N and a frequency of 5 Hz. The
amplitude of the forced motion of the mass is observed to be 20 mm. Find the value of mass
(m).
Fig. (2)
Q3-A (8 Marks): An automobile is modeled as a single-degree-of-freedom system vibrating in
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distance from peak to trough is 0.2 m and the distance along the road between the peaks is 35
m. If the natural frequency of the automobile is 2 Hz and the damping ratio of the shock
absorbers is 0.15, determine the amplitude of vibration of the automobile at a speed of 60
km/hour
6.18
Chapter 2 Solutions
Understanding Motor Controls
Ch. 2 - Prob. 1RQCh. 2 - The symbol shown is:
Normally closed float...Ch. 2 - The symbol shown is: a. Iron core transformer b....Ch. 2 - The symbol shown is:
Normally open pressure...Ch. 2 - The symbol shown is: a. Double acting push button...Ch. 2 - If you were installing the circuit in Figure 233,...Ch. 2 - Referring to the circuit in Figure 2–33, should...Ch. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - When reading a schematic diagram, are the control...
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