Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 64, Problem 3RQ
The triac is a member of what family of devices?
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Using graphical methods, draw the pressure angle at the position shown in (a) and (b).
e
|-------
R = Cam Base Radius
e = Follower Offset
ẞ₁ = Section Duration 1
B₁ = Section Duration 2
ẞ₂ = Section Duration 3
В2
B₁
Follower
Position
ww
R
ẞ3
(a)
Reference
Radial
(b)
The figure below illustrates a graph that has a variable load torque and constant drive torque.
Each cycle lasts three revolutions (6л radians).
Torque (N-m)
600
550
400
1
200
TD=
225 N-m
2
+
-T₁
3
4
1
+
0
In addition, the rotation speed is @o
steady-state conditions, determine
1. the average power required,
2πT
4π
5πT
6п Ꮎ
=
180° rpm
=
18.85 rad/sec, Imachine
125 kg-m². Assuming
2. the maximum and minimum rotational speeds throughout a cycle,
3. the mass of a 0.6-meter-diameter solid disc flywheel to produce Cs = 0.025.
An elastic cord is stretched between 2 points A and B located 2y = 0.8 m apart in the horizontal
plane. When stretched directly between A and B, the tension is P₂ = 40 N. The cord is then stretched as shown
until its midpoint C has moved through x = 0.3 m to C', and a force of F = 240 N is required to hold the cord at
C'. A pellet (m = 0.1 kg) is placed at C' and the cord is released. Find the speed of the pellet as it passes
through C.
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