Understanding A.C. & D.C. Motors

Approved for 14 Hours – Renewal Training Credit (RTC)

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This seminar is for electricians (or maintenance personnel) who work with electric motors. If you are involved with the selection, installation, maintenance or troubleshooting of electric motors this seminar will be of use to you. The two-day seminar will consist of a series of hands-on exercises, demonstrations, and lecture designed to help the participant learn through doing and observing. There is enough theory explained that someone with a very limited electrical background will be able to master the seminar material.

You will learn

  1. Why different types of motors are used in different applications.
  2. Why motor and driven load alignment is critical.
  3. How to wire a 3-phase motor.
  4. How to wire a single-phase motor.
  5. How to maintain a motor.
  6. How to use test equipment & troubleshoot a motor.
  7. How to correct for poor motor Power Factor.
  8. What motor efficiency is and how it relates to your electric bill.

Who will benefit

  • Maintenance personnel with little electrical experience
  • Personnel who need to be cross trained into the electrical field
  • Experienced electricians who desire more understanding of how motors operate and help in their maintenance and troubleshooting
  • Supervisors responsible for motor related issues like purchasing, maintenance or testing


  1. Electrical Theory
    • Magnetic fields
    • Current-voltage-resistance-reactance-impedance
    • Apparent power-true power-reactive power
    • Horsepower-torque-power factor-efficiency
  2. A.C. Motor Construction
    • Stator-stator iron core
    • Squirrel cage rotors-wound rotors
    • Motor frames-bearings
    • Winding insulation
  3. D.C. Motor Construction
    • Field coils-permanent magnets
    • Armature-commutator-brushes
  4. Types of Single Phase Motors
    • Shaded pole
    • Split phase
    • Capacitor start
    • Permanent capacitor
    • Capacitor start and run
  5. Types of Three Phase Motors
    • Squirrel cage rotor
    • Wound rotor
    • 6. Dual Voltage Motors
    • 9 lead wye and delta dual voltage motors
    • 50 hertz, 6 lead dual voltage motors
  6. Wiring and Design of Multiple Speed Motors
    • Constant torque
    • Constant horsepower
    • Variable torque
    • Separate windings-consequential poles
  7. Understanding Motor Nameplate Information
    • Service factor
    • Full load amps
    • Design
    • Code letter
    • Horsepower
    • Frequency-RPM

In-House Training Available

For additional information about in-house training, please call Amy Murphy at (815) 280-1418 or email amurphy@jjc.edu