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AC Motor Redesign

Course length: 
Half day
Theory & design
Course description

The seminar begins with a brief review of AC motor theory and operation that includes flux pattern, types of losses, NEMA design designations and test procedures. It also covers design considerations for slip-ring and synchronous motors, requirements for reduced starting voltage, and formulas for redesigning single-phase and polyphase AC equipment. To ensure a thorough, working knowledge of the subject, you’ll practice solving design problems for each possible change that can be made in the rating of an AC motor.

Partial list of topics covered

How an AC motor operates

  • Flux patterns
  • Breakdown of losses
  • NEMA design designations
  • Slip-ring motors
  • Synchronous motors
  • Reduced voltage starting
  • Testing

 Redesigning polyphase motors

  • Changing voltage
  • Changing horsepower
  • Changing frequency
  • Changing phases (between two-phase and three-phase)
  • Changing circuits
  • Changing span
  • Changing connection (between Wye and Delta)
  • Converting concentric windings to lap windings
  • Changing poles
  • Changing one speed to two speed (one winding and two winding)
  • Calculating a winding for a bare core

 Redesigning single-phase motors

Instructor(s) available to teach the course: 
Tom Bishop, P.E., EASA Senior Technical Support Specialist
Jim Bryan, EASA Technical Support Specialist (retired)
Chuck Yung, EASA Senior Technical Support Specialist
Chapter/Region fee (+expenses): 
$750 plus $20/student for handout
Member company fee (+expenses): 
$1500 plus $20/student for handout
Nonmember fee (+expenses): 
$3000 plus $20/student for handout
Maximum number of students: 
(Additional fees may apply if travel time exceeds 5 hours. Contact EASA for details.)
Condensed course alternatives
Available as a condensed course: