Slip Ring Induction Motor Rotor Resistance

Rotor resistance control is one among the various methods for the speed control of induction motor.

Slip ring induction motor rotor resistance.

Starting of slip ring induction motors. Name one disadvantage of slip ring induction motor and squirrel cage induction motor. In this method of speed control the rotor circuit resistance is varied by connecting a variable external resistance. It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding.

Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit. This method is not applicable to cage rotor induction motor. As the motor accelerates. Definition of slip ring motor.

The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor. The disadvantages are high copper losses and the low torque. But adding external resistance as in the case of a slip ring induction motor makes the rotor resistance high when starting thus the rotor current is low and the starting torque is maximum. A wound rotor motor also known as slip ring rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance.

The speed of the wound induction motor can be controlled by connecting an external resistance in the rotor circuit through slip rings. A motor with a wound type rotor is known as a slip ring induction motor. Also the slip necessary to generate maximum torque is directly proportional to the rotor resistance. Speed control of slip ring induction motor.

This method is only applicable for slip ring or wound rotor induction motor wrim. These motors are usually started with full line voltage applied across its terminals. As these motors have external resistance connected to its rotor circuit the value of starting current is adjusted or kept minimum by increasing the resistance of the rotor circuit. What is a slip ring induction motor.

Adjusting the resistance allows control of the speed torque characteristic of the motor. It has already been stated that this is a common method used to limit the starting current of such machines. For slip ring induction motors additional resistance can be coupled in series with the rotor circuit. It can also be employed for marginal speed control.

1 by varying external resistance. Also rotor windings are connected through slip rings to external resistance. So by varying resistance after the motor has attained rated speed the slip value can. We know that a motor uses an external high resistance circuit for producing high starting torque.