Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
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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A gearbox has permanent shaft positions defined by the bearing mounting positions, but the gear ratio can be changed by changing the number of teeth in the pinion and gear. To achieve similar power transmission ability for different gear ratios, a manufacturer chooses to have the same module for two different gearboxes. One of the gaerboxes has a pinion with 22 teeth, a gear with 68 teeth, and a center distance of 225mm. How large is the gear module and which gear ratios are possible for a pinion with 22 or more teeth using the same module?
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Handwritten solution required ,strictly do not use CHATGPT.
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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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