Three Phase AC Motors

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Polyphase induction AC motors are the workhorse of modern industry. This training teaches critical maintenance skills in an easy to use format. Learn how to diagnose voltage problems, size overload protection properly, and select the right motor for the job. With attention to concepts and practical skills, this training teaches a comprehensive approach to motor maintenance. Selected as the 2007 Product of the Year Winner by Plant Engineering Magazine.

Discount pricing available! For more than ten users, please contact New Standard Institute by using the Contact Us form for multiple user discounts.

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SKU: CT2070. Category: .


  • Polyphase AC motor workings
  • How its made

Rated Voltage

  • Operating under/over rated voltage
  • Unbalanced voltages
  • Derating factors

Load and Current

  • Calculating full load amps
  • Choosing the correct motor

Frequency and Phase

  • Rated frequency
  • 3 phase AC power
  • Full Load / Synchronous speed


  • Estimating motor load
  • Drive limitations
  • Jack shafts and pillow bearings


  • Open / Totally Enclosed
  • NEC Classes
  • Frame size

Insulation Class

  • Motor insulation system
  • Insulation life
  • Insulation ratings


  • Antifriction bearings
  • Number nomenclature
  • Sealed and Shielded


  • Calculating efficiency and power factor
  • Causes of power loss
  • Rebuilding high efficiency motors