Controls and Maintenance
content
- DC SHUNT MOTOR
- DC SERIES MOTOR
- Common DC motors
- SUMMARY OF ANSWER CLASS 1–3
- Start and use DC motors.
- DC Electric Control
- DC DIFFERENTIAL MOTOR CONTROLLER
- DC MOTOR DYNAMIC FRACKING
- BASIC PRINCIPLES OF AUTOMATIC ENGINE CONTROL
- Electromagnetic and solid-state conditions and times
- SUMMARY OF FAMILY RESPONSES 5-10
- Three-speed AC motor
- THREE-PHASE AC MOTOR STARTER
- THREE MOTORCYCLE RIDERS
- SOLID STATE WARS
- WOUND ROTOR ENGINE
- SYNCHRONOUS MOTOR
- SUMMARY OF FAMILY RESPONSES 12–17
- PRIMARY ENGINES
- SPECIAL ENGINES UPON REQUEST
- REPLACEMENT OF AC SERVERS AND MOTORS
- USED ENGINES
- THIRD-PARTY INSTALLATION.
- FOLLOW ENGINE
- Summary of Family Answers (19-25)
- DICTIONARY
preface
We have updated the Tenth Edition of Power 4 to provide more information and better flow. We have added new tools and features to better represent your work environment. Meanwhile, the text retains the popular original’s style and features.
This text introduces the concept of AC and DC motors and the control and maintenance of these devices. We divide the materials into short sections, each focusing on specific concepts or materials. Easy-to-understand language reveals detailed information clearly. Many illustrations and photographs help convey technical knowledge and provide practical information. This type of instruction is a requirement that prepares the student to perform effectively in the job of installing, troubleshooting, repairing, and delivering electric motors and controls.
The student will be able to advance in the study of electrical systems with the information from this book. Electrical technology and the use of electrical products are changing. The electrical industry is constantly introducing new and improved devices and equipment, leading to changes in equipment design and manufacturing. Power supply is also changing to reflect the needs of the industry. It is important that students continue to learn the latest application and update their knowledge.
A common theme groups the chapters, making the text easy to read. The summary of each chapter provides an opportunity to review the main points of the article. Summary A review of the focus group discussion.
Each chapter begins with learning objectives. The Accomplishment Review at the end of each chapter offers readers the opportunity to check their understanding of the material in the created texts before moving on. Some problems in the text require the use of simple algebra, and the student needs to be comfortable with mathematics before attempting to solve equations. It is also important for the reader to understand the basics of electric current and electricity concepts. The National Fire Protection Association recommends making the latest edition of the National Electrical Code® available for reference and student use. Copyright 2013 Cengage Learning. All rights reserved. You may not copy, scan, or duplicate this content, either in whole or in part. Electronic copyright may restrict the inclusion of some third-party content in eBooks and/or chapters. A written study revealed that none of the blocked factors had any effect on the total number of variables. Cengage Learning maintains the right to remove additional content whenever the following rights require it.
Types of DC Motors
We commonly employ shunt, series, compound, and permanent magnet motors. Figure 1-6 depicts schematic diagrams for each type of motor. The mechanical needs of the load determine the type of motor to use. The field circuit of a shunt motor runs parallel to the armature, whereas the armature and field circuits of a series motor connect in series. A compound motor includes both a shunt and a series field winding. Permanent magnet motors only have armature connections.
DC motor ratings include voltage, current, speed, and horsepower output. The connection methods for the armature and field affect the motor’s working characteristics.
TORQUE
The interaction of the armature’s magnetic fields with the poles causes the spinning force at the motor shaft, known as torque. Increased torque leads to increased twisting force on the shaft. We calculate torque by multiplying the force (pounds) by the shaft or pulley radius (in feet).
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