Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 17, Problem 1RQ
Should a metal bar be heated or cooled to make it expand?
Expert Solution & Answer
To determine
Whether the heating of a metal bar results in expansion of it, or cooling results in expansion of it.
Explanation of Solution
In general, all the metals expand on heating and contract on cooling but the rate of expansion and contraction differs for every metals. The rate of expansion depends on the following two factors:
- 1. The type of metal used.
- 2. The magnitude of temperature.
Thus, the expansion of metal bar results due to heating and not cooling.
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Q4/ A compressor is driven motor by mean of a flat belt of thickness 10 mm and a width of
250 mm. The motor pulley is 300 mm diameter and run at 900 rpm and the compressor
pulley is 1500 mm diameter. The shaft center distance is 1.5 m. The angle of contact of
the smaller pulley is 220° and on the larger pulley is 270°. The coefficient of friction
between the belt and the small pulley is 0.3, and between the belt and the large pulley is
0.25. The maximum allowable belt stress is 2 MPa and the belt density is 970 kg/m³.
(a) What is the power capacity of the drive and (b) If the small pulley replaced by
V-grooved pulley of diameter 300 mm, grooved angle of 34° and the coefficient of
friction between belt and grooved pulley is 0.35. What will be the power capacity in this
case, assuming that the diameter of the large pulley remain the same of 1500 mm.
You are tasked with designing a power drive system to transmit power between a motor and a conveyor belt in a manufacturing facility as illustrated in figure.
The design must ensure efficient power transmission, reliability, and safety. Given the following specifications and constraints, design drive system for this application:
Specifications:
Motor Power: The electric motor provides 10 kW of power at 1,500 RPM.
Output Speed: The output shaft should rotate at 150 rpm.
Design Decisions:
Transmission ratio: Determine the necessary drive ratio for the system.
Shaft Diameter: Design the shafts for both the motor and the conveyor end.
Material Selection: Choose appropriate materials for the gears, shafts.
Bearings: Select suitable rolling element bearings.
Constraints:
Space Limitation:
The available space for the gear drive system is limited to a 1-meter-long section.
Attribute 4 of CEP
Depth of knowledge required
Fundamentals-based, first principles analytical approach…
Chapter 17 Solutions
Understanding Motor Controls
Ch. 17 - Should a metal bar be heated or cooled to make it...Ch. 17 - What type of metal remains in a liquid state at...Ch. 17 - How is a bimetal strip made?Ch. 17 - Why are bimetal strips often formed into a spiral...Ch. 17 - Why should electrical contacts never be permitted...Ch. 17 - What two factors determine the amount of voltage...Ch. 17 - What is a thermopile?Ch. 17 - What do the letters RTD stand for?
Ch. 17 - What type of wire is used to make an RTD?Ch. 17 - What material is a thermistor made of?
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