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The best method to increase the starting torque of a 3-phase slip ring induction motor is

  • The best method to increase the starting torque of a 3-phase slip ring induction motor is Rotor Resistance.
  • Adding external resistance to the rotor circuit is a common method to increase the starting torque of a 3-phase slip ring induction motor. This is also known as the "external rotor resistance" method.
  • The starting torque of an induction motor is proportional to the rotor resistance.
  • By increasing the rotor resistance, the starting torque can be increased.
  • This is achieved by adding external resistance to the rotor circuit, usually by inserting resistance in the rotor winding through external resistors.