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# Answer to Question #230242 in Electrical Engineering for KHANYA

Question #230242

What are the effects of slip in the slip-ring induction motors

1
2021-09-04T01:01:09-0400

Slip in an AC induction motor is defined as differenced like between speed of stator field and rotor speed

"s=\\dfrac{n_s-n_r}{n_r}"

Slip is usually expressed as a percentage, and varies by motor, from nominally 0.5 percent for very large motors to about 5 percent for small, specialized motors. If ns is the stator electrical speed and nr is the rotor's mechanical speed, the slip, s, is defined by the above formula.

Motor rotation is developed in an AC induction motor through the effects of a moving magnetic field. As the speed of the rotor drops below the stator speed, or synchronous speed, the rotation rate of the magnetic field in the rotor increases, inducing more current in the rotor's windings and creating more torque.

Slip is required to produce torque. Under load, the rotor speed drops, and the slip increases enough to create sufficient additional torque to turn the load. A very efficient way to control slip is to use a variable frequency drive

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