Advantages and disadvantages of Slip ring induction motor

Advantages:

  • High starting torque with low starting current
  • Smooth acceleration under heavy loads
  • No abnormal heating during starting
  • Good running characteristics after external rotor resistances are cut out
  • Adjustable speed

Disadvantages:

  • The initial and maintenance costs are greater than those of squirrel cage motors
  • The speed regulation is poor when run with resistance in the rotor circuit