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Back to basics: Squirrel cage rotor design

Publication date: 
January 2016
Jim Bryan, EASA Technical Support Specialist
Type of media: 

 The squirrel cage induction motor (SCIM) functions by applying a voltage to the stator winding and inducing a voltage across the air gap in the rotor circuit. The squirrel cage rotor consists of a lamination stack with slots to accommodate some number of rotor bars and shorting (end) rings that tie all the bars together. The squirrel cage consists of bars and end rings that are typically made from alloys of aluminum or copper.

This article reviews some of the basics of squirrel cage rotor design including:

  • Magnetic fields
  • Rotor bar material
  • Rotor bar profile
  • Stator slot-rotor bar combinations