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DeWALT Electric Motor Professional Pocket Reference
Softcover - 384 Pages
 Pocket-Size: 4 x 6 in.

DEWALT Electric Motor Professional Reference



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UGLY's Electric Motors and Controls 2017

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DEWALT Electric Motor Professional Reference

The Reference Guide for anyone working with Electric Motors
by Paul Rosenberg

The DEWALT Electric Motor Professional Reference is a perfect pocket resource that is easy-to-follow and covers everything you need to work with electric motors including running currents, wiring diagrams, lock rotor amps, installation requirements, thermal overloads, maintenance procedures, fuses, maintenance forms, troubleshooting guides, motor controls and much more.

About the Author
Paul Rosenberg is contributing editor for Power Outlet Magazine, past president of the Fiber Optic Association and teaches electrical engineering courses for Iowa State University. He has written more than thirty textbooks and manuals in addition to the DeWALT series of pocket reference books. He has an extensive background in the electrical contracting industry serving as a supervisor, estimator, project manager, designer, and an independent contractor with numerous licenses and professional certifications.

Paul wrote the first ever installation standard for optical fiber (ANSINEIS- 301), as well as a Raceway Installation standard and was awarded a patent for a power transmission module. From 1991 through 1998, Mr. Rosenberg served as special features editor of Electrical Contractor Magazine and has also served as contributing editor to Electrical Distributor Magazine and the Electronic and Low Voltage Newsletter. He has designed and conducted training programs for NECA and Fiber U while continuing to lecture at industry events throughout the United States.

Table of Contents:

Chapter 1-Formulas and Fundamentals

Mechanical and Electrical Degrees
Synchronous Speed
Speed Regulation
AC Motor Torque
Wound-Rotor Motor Torque
DC Motor Torque
Squirrel-Cage Motors
Wound-Rotor Motors
Synchronous Motors
DC Motors
Ohm's Law for Alternating Current
Ohm's Law for Direct Current
Power Factor
Single-Phase Power
Three-Phase AC Circuits and the Utilization
Wye Connection Delta Connection Four-wire System
Types of Power
True Power and Apparent Power
Power Factor Formula
AC/DC Power Formulas
Horse Power Formula
Efficiency Formulas
Voltage Drop Formulas
Conductor Length/Voltage Drop
Conductor Size/Voltage Drop
Formulas for Sine Waves
Calculating Root-Mean-Square (RMS)
Summary of Series, Parallel and Combination Circuits

Chapter 2 - Motor Construction

Capacitor-Start Motor
Operation of Capacitor-Start Motor
Four-Pole Capacitor-Start Motor
Four-Pole, Two-Circuit Capacitor-Start Motor
Six-Pole Capacitor-Start Motor
Dual-Voltage Motors
Single-Voltage Capacitor-Start Motor
Dual-Voltage Capacitor-Start Motor
Reversing Single-Phase Motors
Six-Pole Motor
Reversing Split-Phase Motors
Permanent-Split Capacitor Motor
Two-Value Capacitor Motor
Synchronous Motors
Shaded-Pole Motors
Capacitor Motors
Multi-Speed Single-Phase Motors
Universal Motors
Connections for Multi-Speed Squirrel-Cage Motors
Wye Three-Phase Motors
Reversing Direction
Standard Markings
Wye-Wound Motor For Use on 240/480 Volts
Numbering of Dual-Voltage Wye-Wound Motor
Standard Markings
Four-Pole Series Delta
DC Motors
Two-Pole Compound-Interpole
Brush Positions
Two-Pole Shunt
Two-Pole Series
Cumulative Compound

Chapter 3 - Connections and Diagrams

Delta-Wound Motor for Use on 240/480 Volts
Wye-Wound Motor for Use on 240/480 Volts
Split-Phase Motors
Split-Phase Motor Rotation
Single-Voltage, 3phase, Wye-Connected Motor
Single-Voltage, 3phase, Delta Connected Motor
Dual Voltage, 3phase, Wye Connected Motors
Two-Phase, AC Motors
Connections for A Two-Speed, Constant Horsepower, One Winding Motor
Connections for A Two-Speed, Constant Torque, One Winding Motor
Connections for A Two-Speed, Variably Torque, One Winding Motor
Reversing A Capacitor-Run Motor
Capacitor-Start Motor Voltage Connections
Two-Speed Capacitor Motor
Wound-Rotor Motor Schematic
Reversing Split-Phase Motors
Typical Motor Starter Diagram
Step-Down Transformer Motor Control
Motor Control Circuits
Stop-Start Stations, Jogging, Plugging
Low Voltage Control, Magnetic Starters
Magnetic Starters, Starting Compensator
Reversing Type Starter
Two-Speed Motor with Push-Button
Manual Type Starting Compensator
Resistance and Faceplate Starters
Regulating Rheostat
Adjustable-Speed Capacitor Motors
Multi-Speed Motor Control
Synchronous Motors, Exciter-Field Rheostat
Reduced-Voltage Starting Systems
Changing Speeds
Starting, Stopping, Jogging
DC Series-wound Motor
DC Shunt-Wound Motor
DC Compound-Wound Motor
DC Motor Connections
Shunt-Would, Compound-Wound
Compound Generators
DC Motor Control Circuits
Variable Resistance Speed Control
Speed-Regulating Faceplate Starter
Step-by-Step Resistance Regulation
Constant Speed Shunt and Compound-Wound
Reversible Motor Control

Chapter 4 -Design and Installation

Designing Motor Circuits
Tips on Selecting Motors
Facts to Consider
Summary of Motor Applications
Three-Phase Motor Requirements
Direct Current Motor Requirements
1phase 115 V Motors and Circuits-120 V System
1phase 230 V Motors and Circuits-240 V System
3phase 230 V Motors and Circuits-240 V System
3phase 460 V Motors and Circuits- 480 V System
DC Motors and Circuits
Control Ratings Standard Motor Sizes
Starting Methods: Squirrel-Cage Induction Motors
Setting Branch Circuit Protective Devices
Maximum OCPD
Standard Sizes of Fuses and CB's
Motor Power Formulas --Cost Savings
Heater Selections
Heater Trip Characteristics
Heater Ambient Temperature Correction
Heating Element Specifications
Heater Construction
Motor Bearing and End Plates
Motor Disconnects
Motor Feeder Tap Sizing
General Controller Fault Correction Limits
Horsepower Limits of Individual Motors
Common Service Factors
Small Motor Guide
DC Motor Performance Characteristics
Maximum Acceleration Time
DC Motor Efficiencies, Continuous Rated, 40C Rise
Power Factor Improvement
Typical Motor Power Factors
Efficiency Formulas
Voltage Unbalance Formula
Motor Torque (Inch Pounds-force)
Horsepower to Torque Conversion
Locked rotor Current
NEMA Ratings of 60Hz AC Contractors
Full-Load Currents: DC Motors
Full-Load Currents: 1phase, AC Motors
Full-Load Currents: 3phase, AC Induction Motors
General Effect of Voltage Variation on Direct Current Motor Characteristics
General Effect of Voltage and frequency Variation on Induction Motor- Characteristics
Voltage Variation Characteristics
Frequency Variation Characteristics
Typical Motor Efficiencies
Types of Enclosures
Enclosure insulation, Temperature
Enclosure Ratings
Hazardous Locations
Enclosure Types
Frontal View of Typical Motor
Side View of Typical Motor
NEMA Motor Frame Dimensions
Shaft Coupling Selections
Motor Frame Letters
Motor Frame Dimensions
Motor Frame Table
Motor and Ampacity Ratings
Overload Protection
Motor Circuit Conductors
Motor Controllers
Motor control Circuits
Conductors Supplying Motors and Other Loads
Conductors Supplying Several Motors
Short-Circuit and Ground-Fault Protection
Adjustable-Speed Drives

Chapter 5 - Maintenance

Motor Maintenance Operations
Motor Repair and Service Record
Semiannual Motor Maintenance Checklist
Annual Motor Maintenance Checklist
Locating Circuits
Checking Capacitors
Unmarked 3-Phase Induction Motors
Wye or Delta Connection
Wye-Connected Motor
Delta-Connected Motor
DC Motor Performance Characteristics
AC Frequency Variation Characteristics
Phase Unbalance and Temperature Rise
Phase Unbalance Derating Factor
Single-Phasing Condition
Improper Phase Sequence (Phase Reversal)
Voltage Surge
Voltage Problems
Voltage Variance
Acceptable AC Load Voltage Ranges (60Hz)
Voltage Unbalance
Finding Voltage Unbalance
Motor Overcycling
Improper Ventilation
Excessive Heat
Motor Overloads
Megohmmeter Connections
Ohmmeter Connections
Insulation Spot Testing
Dielectric Absorption Testing
Polarization Index Values
Insulation Step Voltage Testing

Chapter 6 - Troubleshooting

Contactor and Motor Starter Troubleshooting Guide
Direct Current Motor Troubleshooting Guide
Shaded Pole Motor Troubleshooting Guide
Split-Phase Motor Troubleshooting Guide
Three-Phase Motor Troubleshooting Guide
Faulty Solenoid Problems
Mechanical Start
Split-Phase Motor
Motor Current
Defective Pole
Start Winding
Grounded Winding
Shorted Coil
Interpole Polarity
Compound Motors
DC Opens
DC Grounds
Two-Pole Motors
AC Grounds
AC Opens

Chapter 7 - Power Transmission

Method of Aligning Pulleys
Calculating Pulley Diameter
Pulley and Gear Calculations
Formulas for Finding Pulley Sizes
Formulas for Finding Gear Sizes
Formula to Determine Belt Length
Gear Reducer Formulas
Motor Torque Formulas
Adjusting Belt Tension
V-Belt/Motor Size
Standard "V" Belt Lengths
Horsepower Capacities of Light 4-Ply Nylon-Stitched Belts
Horsepower Capacities of Medium 4-Ply Nylon-Stitched Belts
Horsepower Capacities of Heavy 4-Ply Nylon-Stitched Belts
Horsepower Capacities of Medium 4-Ply Woven Endless Cotton Belts
Horsepower Capacities Per Inch of Width of Regular Single-Ply Dacron Belts
Horsepower Capacities Per Inch of Width of Medium Single-Ply Dacron Belts
Horsepower Capacities Per Inch of Width of Light Single-Ply Dacron Belts
Horsepower Capacities of 3/8" Diameter Wound Endless Round Belts
Correction Factors for Small Pulley Angles of Contact Less Than 180
Correction Factors for Belt Variations
Horsepower Capacities of 1/4" Diameter Braided Endless Round Belts
Horsepower Capacities of 3/8" Diameter Braided Endless Round Belts
Horsepower Capacities of 9/16" Diameter Wound Endless Round Belts
Method of Connection: Adjustable-Speed Drive
Method of Connection: Constant-Speed Drive
Maximum Horsepower: Two-Bearing Motors with Chain Drives
Horsepower Limits: Two-Bearing Motors with Belt Drive
Speed Limitations: Belt, Gear, and Chain Drives

384 Pages - 4 x 6 in.


more in DeWALT Series
PLC / Motor Controls
Electrical Related
Electrical Exam Prep
2017 NEC and Related
2014 NEC and Related
LV, CATV Related
Electrical Theory
Electrical Calculations
Electrical Estimating
Construction Related
Building Code Related

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