Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 50, Problem 1RQ
To determine
Full form of SCR.
Expert Solution & Answer
Explanation of Solution
SCR stands for Silicon-controlled Rectifier, which is a four layered semiconductor material. The four layers are of PNPN layers which have three junctions. The SCR has three terminals that are anode, cathode and gate.
SCR is a digital device, hence it has only two states whether on or off. The gate of SCR control the initial flow of current through SCR but once the current starts to flow gate cannot control the flow of current.
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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 50 Solutions
Understanding Motor Controls
Ch. 50 - Prob. 1RQCh. 50 - Prob. 2RQCh. 50 - Prob. 3RQCh. 50 - How many layers of semiconductor material are used...Ch. 50 - SCRs are members of a family of devices known as...Ch. 50 - Briefly explain why thyristors have the ability to...Ch. 50 - What is the average voltage drop of an SCR when it...Ch. 50 - Explain why an SCR must be phase shifted.
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