Electric Motor Control

Eighth Edition
Author: Stephen Herman

This highly practical approach to a difficult topic makes Electric Motor Control an especially useful and effective tool for anyone who will install, monitor and/or maintain electrical motor controls.

The book begins by introducing the simplest of equipment and then builds upon this knowledge, step-by-step, enabling readers to learn how to draw and interpret motor control schematic diagrams. Subsequent units provide useful information on motor control components and how they are connected to form complete control circuits.

Thoroughly updated, this edition features an all-new unit on variable frequency drives, expanded coverage of programmable logic controllers (PLCs), plus the latest information on micro limit switches, brushless exciters for synchronous motors, and vacuum contactors. New information on the similarities and differences between NEMA and IEC control components is also included.

One of the most reader-friendly, yet technically complete, introductions to modern motor theory and applications available anywhere, the book is particularly well suited for use in journeyman electrician training courses or self-study. To use it successfully, readers are assumed to have prior knowledge of basic electricity concepts.

Features:

• Topics are organized into short, stand-alone units with specific learning objectives, making it easy to read and learn from the book or use it as an on-the-job reference
• Numerous control schematics and wiring diagrams are included to help those new to the world of motor control in understanding and interpreting the function of a control circuit
• Practical problem-solving gets readers thinking about the process of drawing and reading control schematics, leading to an understanding of the basic concepts needed to troubleshoot control systems
• Many different types of control circuits are introduced and illustrated, providing readers with a complete understanding of how control components operate as well as their intended uses
• A glossary and handy appendices provide further explanation of essential terms as well as servicing and troubleshooting procedures

• Includes updated artwork and schematic diagrams

• A new unit on troubleshooting techniques provides real-life tools for readers

• Step-by-step instructions are given on how to use the voltmeter, ammeter, and ohmmeter when troubleshooting a control circuit

• Updated content includes coverage of Mercury bulb float switches

• Short, self-contained, 4-10 page units are a key trademark feature of this book so that content can be easily matched up with teacher and learner needs

Contents:

Preface

Section 1: Introduction
Unit 1 General Principles of Electric Motor Control
Unit 2 Fractional and Integral Horsepower Manual Motor Starters
Unit 3 Magnetic Line Voltage Starters

Section 2: Circuit Layout, Connections, and Symbols
Unit 4 Symbols
Unit 5 Interpretation and Application of Simple Wiring and Elementary Diagrams

Section 3: Control Pilot Devices
Unit 6 Push Buttons and Control Stations
Unit 7 Relays
Unit 8 Contractors
Unit 9 Timing Relays
Unit 10 Pressure Switches and Regulators
Unit 11 Float Switches
Unit 12 Flow Switches
Unit 13 Limit Switches and Proximity Control
Unit 14 Phase Failure Relays
Unit 15 Solenoid Valves
Unit 16 Temperature Switches

Section 4: Basic Control Circuits
Unit 17 Two-wire Controls
Unit 18 Three-wire and Separate Controls
Unit 19 Hand-off Automatic Controls
Unit 20 Multiple Push-button Stations
Unit 21 Interlocking Methods for Reversing Control
Unit 22 Sequence Control
Unit 23 Jogging (Inching) Control Circuits
Unit 24 Time-delay, Low-voltage Release Relay

Section 5: AC Reduced Voltage Starters
Unit 25 The Motor and Starting Methods
Unit 26 Primary Resistor-type Starters
Unit 27 Autotransformer Starters
Unit 28 Part Winding Motor Starters
Unit 29 Automatic Starters for Star-Delta Motors
Unit 30 AC Solid-State Reduces Voltage Controller

Section 6: Three-Phase, Multispeed Controllers
Unit 31 Controllers for Two-speed, Two-winding (Separate Winding) Motors
Unit 32 Two-speed, One-winding (Consequent Pole) Motor Controller
Unit 33 Four-speed, Two-winding (Consequent Pole) Motor Controller

Section 7: Wound Rotor (Slip Ring) Motor Controllers
Unit 34 Wound Rotor Motors and Manual Speed Control
Unit 35 Push-button Speed Selection
Unit 36 Automatic Acceleration for Wound Rotor Motors
Unit 37 Automatic Speed Control for Wound Rotor Motors
Unit 38 Solid-state Adjustable Speed Controller for AC Wound Rotor Motors

Section 8: Synchronous Motor Controllers
Unit 39 Synchronous Motor Operation
Unit 40 Push-button Synchronizing
Unit 41 Timed Semiautomatic Sychronizing
Unit 42 Synchronous Automatic Motor Starter

Section 9: Direct -Current Controllers
Unit 43 About DC Motors
Unit 44 Use of Reduced Voltage for Starting
Unit 45 Across-the-line Starting
Unit 46 Compensating and Definite Time Control Starting
Unit 47 Solid-State Adjustable Speed Control

Section 10: Methods of Deceleration
Unit 48 Plugging
Unit 49 Electric Brakes
Unit 50 Dynamic and Regenerative Braking
Unit 51 Electric and Electronic Braking

Section 11: Motor Drives
Unit 52 Direct Drives and Pulley Drives
Unit 53 Gear Motors
Unit 54 Variable Frequency Mechanical Drives
Unit 55 AC Adjustable Frequency Solid-State Drives
Unit 56 Magnetic Clutch and Magnetic Drive
Unit 57 DC Variable Speed Control - Motor Drives
Unit 58 Programmable and Motion Control
Unit 59 Motor Startup and Troubleshooting Basics

Appendix A Motor Types and Line Diagrams
Appendix B Power Supplies and Circuits

Glossary
Index

416 Pages - 8-1/2 x 11 in.

1418028703 / 9781418028701