Standard

rev.10/13/03

IDS 105 - DC and AC Motors

Course Description

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

 

Competency Areas

Hours

Motor Theory and Operating Principles

Class

2

Motor Terminology

D. Lab

0

Motor Identification

P. Lab/O.B.I.

3

NEMA Standards

Credit

3

AC Motors

 

 

DC Motors

 

 

Scheduled Preventive Maintenance

 

 

Troubleshooting and Failure Analysis

 

 

 

Prerequisite: Corequisite:  IFC 101, IFC 102

 

Course Guide

 

Competency

After completing this section, the student will:

Hours

Class

D.Lab

P.Lab/

O.B.I.

MOTOR THEORY AND OPERATING PRINCIPLES

2

0

6

Concepts

Describe the laws of magnetism and their application to AC and DC motors.

 

 

 

 

Compare the operating principles of AC motors with those of DC motors.

 

 

 

 

Compare the characteristics of AC motors with those of DC motors.

 

 

 

MOTOR TERMINOLOGY

1

0

2

Terms and components

Define terms associated with electric motors.

Identify components of electric motors.

 

 

 

MOTOR IDENTIFICATION

3

0

2

Types

Name different types of AC and DC motors.

 

 

 

 

Identify the characteristics of each type of AC and DC motor.

 

 

 

Name plate

Determine voltage, amperage, speed, horsepower, NEMA class, and environmental requirements of electric motors using data from motor name plate.

 

 

 

NEMA STANDARDS

1

0

2

Purpose

Identify the purpose of NEMA standards for electric motors.

 

 

 

Operational characteristics

Relate NEMA design codes to operating characteristics of electric motors.

 

 

 

Motor enclosures

Describe NEMA standards for types of electric motor enclosures.

 

 

 

AC MOTORS

6

0

8

Classes

Name the three classes of AC motors.

 

 

 

Operational characteristics

Describe the operating characteristics of the three classes of AC motors.

 

 

 

Components

Identify the components of AC motors.

 

 

 

DC MOTORS

3

0

4

Classes

Name the three classes of DC motors.

 

 

 

Operational characteristics

Describe the operating characteristics of the three classes of DC motors.

 

 

 

Components

Identify the components of DC motors.

 

 

 

SCHEDULED PREVENTIVE MAINTENANCE 

2

0

2

Visual inspection

Perform visual inspection using procedure described in manufacturer’s service manual.

 

 

 

Motor lubrication

Lubricate motor according to procedure described in the manufacturer's service manual.

 

 

 

Cleaning procedure

Clean motor according to procedure outlined in the manufacturer’s service manual.

 

 

 

TROUBLESHOOTING AND FAILURE ANALYSIS

2

0

4

Techniques

Discuss techniques for troubleshooting electric motors.

 

 

 

 

Suggested Resources

 

Suggested Resources include most current edition of textbooks listed below.

 

Books

 

Adams, J., & Rockmaker, G. Industrial Electricity: Principles and Practices. New York: McGraw-Hill.

Alerich, W. N. Electricity Three: Motors and Generators, Controls, Transformers. Albany, NY: Delmar.

Herman, S. L., & Alerich, W. N. Industrial Motor Control. Albany, NY: Delmar.

Miller, Rex and Mark. Electric Motor Controls. Englewood Cliffs, NJ: Prentice Hall.

Nadon, J. M., et al. Industrial Electricity. Albany, NY: Delmar.

Stallcup, J. G. Motors and Transformers Based on the 1990 NEC. Homewood, IL: Am Technical.