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Electromechanics: Principles, Concepts and Devices
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by: James Harter, Mesa Community College
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Description
For courses in Electric Machines, Advanced Industrial Electronics, Machines and Motors, Electromechanics, Electrical Maintenance, and Automated Systems in departments of technology and electronics technology. Designed for Community College, Vocational and Trade School, and Industrial and Engineering Technology programs.
This comprehensive introduction to mechanical and electrical devices and their underlying principles of operation gives students the unified treatment of mechanical and electrical topics so much in demand in today's workplace. Practical, hands-on information related to operating, installing, troubleshooting, and servicing a wide range of electromechanical devices and systems is presented. Graded, self-paced chapters progress through mechanical, electrical, and magnetic concepts and principles, to their actual applications in a wide range of electromechanical devices. Subsequent chapters include topics relating to sequential process control, ladder diagrams, and automatic control systems. Numerous examples are presented throughout the text, together with a wealth of problem-solving techniques.
Table of Contents
1) Number Notation, Measurement, and Units
2) Linear Motion
3) Principles of Simple Machines and the Lever
4) The Pulley, Wheel and Axle, and Inclined Plane
5) Friction, Lubrication, and Bearings
6) Work, Energy, Torque, and Power
7) Rotational Power Transmission
8) Rotation, Linear, and Intermittent-Motion Devices
9) The Electric Circuit
10) Electromagnetic Circuits and Devices
11) Transformers and Power Distribution
12) Overcurrent Protection
13) Sequential Process Control
14) Alternating-Current Electric Motors
15) Direct-Current Motors and Alternating-Current Drives
16) Concepts of Automatic Control Systems
Glossary of Selected Technical Terms, Abbreviations, and Acronyms
Appendixes
Answers to Chapter Exercises
Index
Features
* NEW - Added chapter on automatic control systemsIncludes the various elements that make up a control system as well as the variables, signals, terms, and symbols common to automatic control.
Introduces students to the principles and concepts associated with automatic process and servo control systems.
* NEW - Added section on adjustable frequency AC drives.
Discusses the concept of the volts per hertz ratio, pulse-width modulation drive systems, and vector control of squirrel-cage induction motors.
* NEW - Coverage of scientific notation(Chapter 1).
Improves students' understanding of precision as it applies to English units.
* NEW - Section on synthetic lubricants(Chapter 5).
Enables students to focus on the current practice of using synthetic oils and greases to lubricate modern machines.
* NEW - Discussion of ampacity(Chapter 9).
Helps students understand the interrelationship between ampacity and AWG in specifying conductor size for electric circuits.
* NEW - Coverage of conductor temperature rise(Chapter 12).
Emphasizes the importance of selecting and specifying overcurrent devices with the correct rating, ensuring that conductors are not overheated and the insulation damaged when a fault condition occurs in an electric circuit.
* NEW - Rewritten section on starting squirrel-cage induction motors and reduced voltage starting(Chapter 14).
Highlights the need for reduced voltage starting of large horsepower squirrel-cage induction motors using wye-delta or primary resistor starters.
* Integrated, unified treatment of mechanical and electrical topics.
Supplies the modern technician with the essential information for handling more than one area of technology.
* Comprehensive coverageIncludes electromechanical basics such as transformers, stepper motors, and DC and AC motors (1- and 3-), as well as sequential process control.
Offers students up-to-date material that unifies the concepts and principles common to machine tools, automated process, robotic systems, electric energy production, heating, cooling, ventilation systems, and more.
* Coverage of dimensional analysisCoupled with problem solving.
Motivates students and teaches them how to determine units for computed quantities.
* Use of both the British Engineering System and System International.
Familiarizes students with both the English and metric systems that are found in the workplace when listing replacement parts, tools, and equipment.
* IEEE/ASTM SI 10-1997 standardsFor quantities and units of measurement.
Provides students with the most current standards for applying the SI system of electromechanical technology.
* Chapter introductions and performance objectives.
Allows students to focus on exactly what is to be taken from the chapter, and organize their learning goals.
* Chapter-end summaries, questions, and problem sets.
Gives students a review of key content, and reinforcement of practical design and replacement problems.
* Selected technical terms.
Ensures students' understanding of important terminology in each chapter.
* 150 illustrative examples throughout.
Highlights what is important, and gives students examples of problem-solving techniques.
* Comprehensive and detailed illustrations, diagrams, and industrial photographs.
Portrays key technical concepts so that students can quickly comprehend the material and make a solid connection between the theoretical and the practical.
* Extensive use of tables.
Summarizes and centralizes specifications, formulas, design data, key concepts, and important information.
* Student-friendly writing styleFeatures a consistent reading level and understandable language, and assumes no math background beyond elementary algebra.
Enables students to effortlessly read, understand, and follow the body of the text.
* A review of number notation, systems of measurement, and conversion between and within measuring systems.
Makes the text accessible to students without previous mechanical training.
New To This Edition
* Added chapter on automatic control systemsçIncludes the various elements that make up a control system as well as the variables, signals, terms, and symbols common to automatic control.
Introduces students to the principles and concepts associated with automatic process and servo control systems.
* Added section on adjustable frequency AC drives.
Discusses the concept of the volts per hertz ratio, pulse-width modulation drive systems, and vector control of squirrel-cage induction motors.
* Coverage of scientific notation(Chapter 1).
Improves students' understanding of precision as it applies to English units.
* Section on synthetic lubricants(Chapter 5).
Enables students to focus on the current practice of using synthetic oils and greases to lubricate modern machines.
* Discussion of ampacity(Chapter 9).
Helps students understand the interrelationship between ampacity and AWG in specifying conductor size for electric circuits.
* Coverage of conductor temperature rise(Chapter 12).
Emphasizes the importance of selecting and specifying overcurrent devices with the correct rating, ensuring that conductors are not overheated and the insulation damaged when a fault condition occurs in an electric circuit.
* Rewritten section on starting squirrel-cage induction motors and reduced voltage starting(Chapter 14).
Highlights the need for reduced voltage starting of large horsepower squirrel-cage induction motors using wye-delta or primary resistor starters.
Reviews:
Preface
Electromechanics: Principles, Concepts, and Devices, Second Edition, has been designed to give the reader an understanding of a broad segment of technology dealing with the interrelationship of electrical and mechanical machine elements and their underlying principles of operation. This book is intended for today's equipment technician, maintenance mechanic, electrician, or manufacturing technician who is responsible (in conjunction with others) for all the know-how beyond the initial design of a machine. This publication supports the technical staff's daily activities by providing an introduction to principles, concepts, devices, and applications related to operating, installing, troubleshooting, and servicing electromechanical systems.
The book works equally well as a self-paced study guide for employed technicians and maintenance personnel who are working independently to upgrade themselves or as a text for a course in electromechanics. The graded chapters progress from the concepts and principles of mechanics, electricity, and magnetics to the applications for electromechanical machine elements, finishing with a chapter introducing the concepts of automatic control systems.
This text has numerous figures and examples designed to help both teacher and learner. Problem-solving techniques, which are emphasized throughout the text, are presented in a conversational tone. Coupled with problem solving is the helpful technique of dimensional analysis, which is used to determine units for computed quantities. The use of practical design and replacement types of problems throughout the text is a strong motivator for the learner.
Electromechanics: Principles, Concepts, and Devices, Second Edition, assumes no previous mechanical training or understanding of mechanical units of measurement since it begins with a review of number notation, systems of measurement, and conversion between and within measuring systems. It continues to the principles of linear motion (Newton's laws, time, distance, speed, acceleration, etc.) and then progresses through a series of simple machines and their principles, ending with several applications dealing with lubrication and bearings. Once this series of topics is completed, the study of mechanics continues with the concepts and principles of rotary motion and its application to the transmission of power. Mechanical applications include the study of various radial and axial power-transmission machine elements (such as couplings, gearing, and belt and chain drives), oscillatory-motion mechanisms, and intermittent-motion mechanisms. The mechanical section concludes with the study of motion characteristicsconstant velocity, constant acceleration, and jerk.
The remainder of the book deals with principles of electrical and magnetic circuits and devices, power, work (energy), applications of transformers, overcurrent devices, relays, contactors, starters, and solenoids. The text concludes with the study of sequential process control, ladder diagrams, and motors, both ac and do as well as adjustable frequency ac drives, stepper motors, and an introduction to automatic control systems.
This text uses both the British Engineering System, or BES (English system), and the International System of Units, or SI (metric system), in the study of mechanics (distance, speed, acceleration, work, and power). Both systems are still studied, even today, because many parts suppliers list replacement parts, tools, and equipment in English units, whereas new equipment and products are increasingly specified in metric units. As in the past, technicians who work with mechanical equipment as well as electrical and electronic equipment must be educated in both the SI and BES systems.
The author wishes to acknowledge and thank Roger Harlow, for his steadfast support for this project from its inception through its completion; Rosalia Cahill, for her diligence in providing the solutions to the exercises and end-of-chapter questions and problems; Roger Scheunemann, for his preparation of the glossary; Tom Harter, for his creative talents in drawing the first-draft illustrations; and John Bown, for his assistance in obtaining vendor literature. Lastbut certainly not leasta caring recognition of my wife, Janet, for her support during the preparation of the manuscript, for her diligence in reading the manuscript for spelling and grammar, and for her numerous suggestions for improving the readability of the manuscript.