Maricopa Community Colleges  ABC260   19952-19956 
Official Course Description: MCCCD Approval: 11/28/95
ABC260 19952-19956 L+L 1 Credit(s) 1 Period(s)
Induction Motor Maintenance
Electric motor cleaning, vibration testing, magnetic centering, testing and metering motors' power factor. Testing running temperatures and other maintenance techniques. Prerequisites: (Indentured status with Associated Builders and Contractors, Inc., and ABC221) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC260   19952-19956 Induction Motor Maintenance
1. Demonstrate procedure for testing motor winding resistance. (I)
2. Describe the basic categories of electric motors. (II)
3. Explain the factors that determine motor speed. (III)
4. Explain the National Electrical Manufacturers Association (NEMA) definitions for an induction motor's characteristic torques. (IV)
5. Meter motor circuits in order to measure power factor. (V)
6. Identify the basic types of motor starters. (VI)
7. Describe the insulation systems associated with conductors and the supporting structural parts of a motor. (VII)
8. Describe usual and unusual service conditions as applied to motors.
9. Explain the purpose and perform motor winding insulation tests. (IX)
10. Outline the importance of, and demonstrate the techniques and procedures for insulation cleaning and drying. (X)
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MCCCD Official Course Outline:
 
ABC260   19952-19956 Induction Motor Maintenance
    I. Motor Maintenance
        A. Terminology
        B. Induction motor
        C. Rotor windings
        D. Squirrel cage rotors
        E. Air Gap
        F. Effects of overloading and single phase operation
        G. Testing procedure
      II. Basic Motor Principles
          A. Direct current motor (DC)
          B. Alternating current motor (AC)
            1. Single-phase AC
            2. Three-phase AC
            3. Polyphase AC
            4. Squirrel-cage
            5. Other
        III. Motor Speed
            A. Frequency
            B. Poles
            C. Squirrel-cage induction
            D. Speed and slip
            E. Rotation
            F. Torque and horsepower
          IV. Torques
              A. Locked-rotor
              B. Breakdown
              C. Pull-up
              D. Rated-load
            V. Power Factor
                A. Across-the-line starting
                B. Reduced voltage starting
                  1. Primary resistor
                  2. Autotransformer
                  3. Wye-delta
                  4. Part-winding
                C. Measuring
              VII. Insulation Systems
                  A. Class A
                  B. Class B
                  C. Class F
                  D. Class H
                VIII. Service Conditions
                    A. Usual - damaging atmospheres
                    B. Unusual - mechanical/electrical loading
                  IX. Motor Insulation Testing
                      A. Insulation resistance tests
                        1. Polarization index
                        2. Determining polarization index
                      B. Dielectric voltage withstand tests
                      C. AC voltage withstand tests
                      D. DC voltage withstand tests
                      E. Safety
                      F. Suggested test procedures
                    X. Insulation Cleaning and Drying
                        A. Drying electrical insulation
                        B. Methods of drying
                        C. Synchronous motors and condensers
                        D. Synchronous converters
                        E. Industrial motors
                        F. Troubleshooting
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