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What is the advantage of the double squirrel cage motor compared to round bar cage motor?

What is the advantage of the double squirrel cage motor compared to round bar cage motor? Correct Answer The starting current of the motor is lower

Comparison between double squirrel cage motor and round bar cage motor:

  • A double cage rotor has low starting current and high starting torque, therefore, it is more suitable for direct on line starting
  • Since effective rotor resistance of double cage motor is higher, there is larger rotor heating at the time of starting as compared to that of single cage rotor
  • The high resistance of the outer cage increases the resistance of double cage motor, so full load copper losses are increased, and efficiency is decreased
  • The pull-out torque of double cage motor is smaller than single cage motor
  • The cost of double cage motor is about 20-30% more than that of single cage motor of same rating

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