INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 40, Problem 1RQ
To determine
The voltage that must be used when a dual voltage 240/480 volt motor is to be used for the part of stator winding.
Expert Solution & Answer
Explanation of Solution
Consider that for a low dual voltage motor the motor must be operated in the low voltage setting to operate a part of the stator winding.
The reason for this is that the only one winding is connected to the power line at the time of starting, thus the high starting current at the time of the starting can overheat the winding thus, damaging it.
Thus, the low voltage of 240 V must be used for the part of the winding.
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"11-17 The shaft shown in Figure P11-3 was designed in Problem 10-17. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
Problem 10-17, design suitable bearings to support the load for at least 1E8 cycles at
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(a)
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✓ ✓
cast-iron roller
FIGURE P11-3
Shaft Design for Problems 11-17
b
gear
key
assume bearings act
as simple supports
11-19 The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
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1200 rpm. State all assumptions.
(a)
Using hydrodynamically lubricated bronze sleeve bearings with Oy = 40,
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gear
gear
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FIGURE P11-4
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For the frame below calculate the bending moment at point R. Take P=40 and note that this value is used for both
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2.5P-
A
Q
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С
45 degrees
✗
✗
P
i
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4PRN
-P-
-
Chapter 40 Solutions
INDUSTRIAL MOTOR CONTROL
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