Question:
What are slip and slip speed in an induction motor?
Answer:
Step 1 of 2
Slip and slip speed of an induction are used to define the relative motion of the rotor and magnetic fields.
The slip speed of an induction motor is defined as the difference between synchronous speed and rotor speed.
It is given by,
Where,
Slip speed of the machine in r/min
Synchronous speed of the magnetic field
Shaft speed of the motor
Step 2 of 2
The slip of an induction motor is defined as the ratio of slip speed 
, and synchronous speed of the magnetic field 
. Also the slip of an induction motor is the relative speed expressed on a per unit or a percentage basis.
Slip is expressed as,
