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The interaction of turns and pitch: How they react affects the performance of a motor

  • February 2012
  • Number of views: 3051
  • Article rating: No rating

Jim Bryan
EASA Technical Support Specialist

When designing or redesigning an electric motor, there are many trade-offs. For instance, opening up the air gap to improve power factor might diminish the efficiency. For every action taken in adjusting the motor’s design, there is a reaction at some other point that affects the motor’s performance.

One of the critical considerations involves the interaction of the turns per coil and pitch. As you shorten the pitch, it requires more turns to generate the same torque. But, as you increase the number of turns, the wire takes up more space in the slot. The way to overcome this problem is to decrease the wire size. But decreasing the wire size decreases the current density, in­creasing the I2R losses and operating temperature. 

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 3: Rewinding

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 7: Stators

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 7: Stators

How To Wind Three-Phase Stators interactive training software

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