Standard

 

ELT 111 – Single-Phase and Three-Phase Motors

Course Description:

Introduces the fundamental theories and applications of single-phase and three-phase motors. Topics include: motor theory/operating principles, motor terminology, motor identification, NEMA standards, motor efficiencies, preventive maintenance, troubleshooting/failure analysis, and NEC requirements.

 

Competency Areas:

Hours:

 

 

 

Motor Theory/Operating Principles

Class

4

Motor Terminology

D. Lab

0

Motor Identification

P. Lab/O.B.I.

3

NEMA Standards

Credit

5

Motor Efficiencies

 

 

Preventive Maintenance

 

 

Troubleshooting/Failure Analysis

 

 

NEC Requirements

 

 

 

 

 

Prerequisite:

ELT 119, IFC 100, IFC 101

Corequisite:

 

 

Course Guide

 

Competency

After completing this section, the student will:

Hours

Class

D. Lab

P. Lab/

O.B.I.

MOTOR THEORY/OPERATING PRINCIPLES

8

0

7

Components

Identify basic components of an AC motor.

 

 

 

MOTOR TERMINOLOGY            

4

0

2

Components

Identify components of single-phase and three-phase motors.

 

 

 

Operating characteristics

List operating characteristics of single-phase and three-phase motors.

 

 

 

MOTOR IDENTIFICATION

4

0

7

Single phase motors

Identify five principal types of single-phase motors: shaded pole, split phase, capacitor, repulsion, and series.

 

 

 

Induction motors

Identify induction motor.

 

 

 

 

Connect fields of a three-phase motor for low or high voltage.

 

 

 

NEMA STANDARDS

4

0

2

Design motors

Recognize NEMA design motors A-D.

 

 

 

NEMA enclosures

Recognize NEMA enclosures.

 

 

 

Motor insulation

Determine NEMA class for motor insulation in applications for variable temperatures.

 

 

 

MOTOR EFFICIENCIES   

4

0

2

Motor efficiencies

Calculate motor efficiencies of single-phase and three-phase motors.

 

 

 

PREVENTIVE MAINTENANCE

4

0

2

Preventive maintenance

Plan a preventive maintenance program for AC motors.

 

 

 

 

Apply a preventive maintenance schedule to AC motors.

 

 

 

TROUBLESHOOTING/FAILURE ANALYSIS    

4

0

5

Troubleshooting techniques

Apply troubleshooting techniques.

 

 

 

 

Analyze performance of AC motors.

 

 

 

 

Determine component failure of AC motors.

 

 

 

Thermographic surveys

Discuss thermographic use.

 

 

 

NEC REQUIREMENTS

8

0

3

Compliance

Comply with Code requirements on power supplies, grounding, wiring, and interrupting capabilities.

 

 

 

 

Suggested Resources

 

Books:

 

Alerich/Herman, Electric Motor Control (6th Ed.), Delmar Publishers, ISBN 0-8273-7644

Carpenter, Davis; Electrician’s Technical References Motors, Published by Delmar Publishers, ISBN 0-8273-8513-7

Croft, Terrell and Summers, Wilford I.; American Electricians Handbook, McGraw-Hill Publishers ISBN 0-07-013936-9

Hart, Ugly’s Electrical References, Burleson Distribution Corp. ISBN 0-9623229-6-2

Herman, Delmar’s Standard Textbook of Electricity (2nd ed.) Delmar Publishers ISBN 0-8273-8550-1

Herman, Experiments in Electricity for use with Lab-Volt EMS Equipment, Delmar Publishers ISBN 0-8273-8552-8

Rockis/Mazur, Electric Motor Controls (2nd ed.), American Technical Publishers ISBN 0-8269-1675-9

Rockis/Mazur, Electric Motor Controls Workbook (2nd ed.), American Technical Publishers ISBN 0-8269-1676-7

Rosenberg, Robert,; Electrical Motor Repair (3rd ed.), Delmar Publishers, ISBN 0-03-059584-3

Investigations in Electric Power Technology, Published by Lab-Volt

NEC 2002 Code, NFPA, Delmar Publishers ISBN 0-8776-5460-3