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Rotor design variables will affect speed torque characteristics of motor

  • November 2001
  • Number of views: 3992
  • Article rating: 5.0

Cyndi Nyberg 
Former EASA Technical Support Specialist 

When manufacturers design a motor, there are many variables. For a given stator, the winding has to conform to some fairly rigid rules, and there is not a lot of variance, even among different manufacturers. However, the rotor de­sign is wide open. The variables in the rotor design include: the number of bars, bar material, bar shape, end ring design, skew, air gap, and construction (cast or fabricated). All of these will ultimately have an impact on the speed torque characteristics of a motor. 

Unfortunately, because of the rotor design, it is difficult to alter the basic shape of the speed torque curve of a motor in for repair by modifying the stator winding. Modifications can be made to the rotor such as changing the bar material or size, and changing the end ring design, but it is difficult to determine the actual effect they will have on the operating characteristics. 

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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 5: Basic Motor Theory
  • Section 6: Motor Standards
  • Section 8: Squirrel Cage Rotors

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards
  • Section 8: Squirrel Cage Rotors

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