Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 4.4, Problem 4T
To determine
Result on replacing 12 V to 120 V in pilot lights.
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37. The vertical shaft shown in Figure P12-37 is driven at a
speed of 600 rpm with 4.0 hp entering through the bevel
gear. Each of the two chain sprockets delivers 2.0 hp to
the side to drive mixer blades in a chemical reactor vessel.
The bevel gear has a diametral pitch of 5, a pitch diameter
of 9.000 in, a face width of 1.31 in, and a pressure angle
of 20°. Use SAE 4140 OQT 1000 steel for the shaft. See
Chapter 10 for the methods for computing the forces on
the bevel gear.
Figure P12-37: P37-Bevel gear drive with two chain
sprockets
Each problem includes the following details:
■Design the complete shaft, including the specification of
the overall geometry and the consideration of stress con-
centration factors. The analysis would show the minimum
acceptable diameter at each point on the shaft to be safe
from the standpoint of strength.
Homework Problems 12-24, 12-35, and 12-37 from
textbook, done in spreadsheet form. Place drawings of the
load, shear, and bending moment body diagrams…
35. The double-reduction, helical gear reducer shown in
Figure P12-35 transmits 5.0 hp. Shaft 1 is the input,
rotating at 1800 rpm and receiving power directly from an
electric motor through a flexible coupling. Shaft 2 rotates
at 900 rpm. Shaft 3 is the output, rotating at 300 rpm. A
chain sprocket is mounted on the output shaft as shown
and delivers the power upward. The data for the gears
are given in Table 12-5. Each gear has a 1412° normal
pressure angle and a 45° helix angle. The combinations of
left- and right-hand helixes are arranged so that the axial
forces oppose each other on shaft 2 as shown. Use SAE
4140 OQT 1200 for the shafts.
Figure P12-35: P35-Double-reduction helical drive
Each problem includes the following details:
■Design the complete shaft, including the specification of
the overall geometry and the consideration of stress con-
centration factors. The analysis would show the minimum
acceptable diameter at each point on the shaft to be safe
from the standpoint of…
Chapter 4 Solutions
Electric Motors and Control Systems
Ch. 4.1 - Prob. 1RQCh. 4.1 - Prob. 2RQCh. 4.1 - What do the terms normally open and normally...Ch. 4.1 - The types of enclosures used to house motor...Ch. 4.1 - Prob. 5RQCh. 4.1 - Compare the operation of momentary and maintained...Ch. 4.1 - What is the OSHA requirement for resetting...Ch. 4.1 - Prob. 8RQCh. 4.1 - Explain how a push-to-test pilot light operates.Ch. 4.1 - Compare the way in which pushbutton and selector...
Ch. 4.1 - Prob. 11RQCh. 4.2 - Define the term mechanically operated switch.Ch. 4.2 - In what way are limit switches normally actuated?Ch. 4.2 - A control application calls for an NC held open...Ch. 4.2 - List four common types of limit switch operator...Ch. 4.2 - Prob. 5RQCh. 4.2 - Prob. 6RQCh. 4.2 - For what types of machine control applications are...Ch. 4.2 - How does a fluid capillary tube temperature switch...Ch. 4.2 - Prob. 9RQCh. 4.2 - Prob. 10RQCh. 4.3 - In general, how do sensor pilot devices operate?Ch. 4.3 - What is the main feature of a proximity sensor?Ch. 4.3 - List the main component of an inductive proximity...Ch. 4.3 - Explain the term hysteresis as it applies to a...Ch. 4.3 - How is a two-wire sensor connected relative to the...Ch. 4.3 - In what way is the sensing field of a capacitive...Ch. 4.3 - For what type of target would a capacitive...Ch. 4.3 - Prob. 8RQCh. 4.3 - Name the three most common scan techniques for...Ch. 4.3 - What are the advantages of fiber optic sensing...Ch. 4.3 - Outline the principle of operation of a Hall...Ch. 4.3 - Outline the principle of operation of an...Ch. 4.3 - List the four basic types of temperature sensors...Ch. 4.3 - Compare the way in which a tachometer and magnetic...Ch. 4.3 - Outline the principle of operation of an optical...Ch. 4.3 - What approach is usually taken to measurement of...Ch. 4.3 - Prob. 17RQCh. 4.4 - Define the term actuator as it applies to an...Ch. 4.4 - In what ways are electromagnetic relays employed...Ch. 4.4 - Prob. 3RQCh. 4.4 - Prob. 4RQCh. 4.4 - Prob. 5RQCh. 4.4 - Prob. 6RQCh. 4.4 - Prob. 7RQCh. 4.4 - Prob. 8RQCh. 4.4 - Prob. 9RQCh. 4.4 - What is the basic difference between an open-loop...Ch. 4.4 - Prob. 11RQCh. 4.4 - Prob. 12RQCh. 4.4 - In what way docs a double-break contact differ...Ch. 4.4 - Prob. 14RQCh. 4.4 - Prob. 1TCh. 4.4 - Prob. 2TCh. 4.4 - Prob. 4TCh. 4.4 - Prob. 5TCh. 4.4 - A through-beam photoelectric sensor appears to be...Ch. 4.4 - Prob. 1DTCh. 4.4 - Prob. 2DTCh. 4.4 - Prob. 3DTCh. 4.4 - What does the range adjustment on a float switch...Ch. 4.4 - A stepper motor cannot be bench-checked directly...
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