There are two types of induction motors: squirrel cage and slip ring. The speed of an induction motor is less than the synchronous speed due to slip, which is the difference between synchronous and induction motor speeds. Test results from no-load and blocked rotor tests are used to determine core and copper losses, with maximum efficiency achieved when losses are equal. Common starters for induction motors include star-delta, direct online, and auto-transformer starters, with torque proportional to the square of voltage and inversely proportional to the square of resistance and reactance.

1. The are are two types of induction
motor, squirrel cage induction moTor
and slip ring induction motor

2. Slip of induction motor
The induction motor runs at speed less than
synchronous speed.,120f/p.The relative
speed difference between synchronous speed
and Induction motor speed is called
slip.speed of induction motor is given by
NR=NS(1-S)

3. BLOCKED ROTOR TEST AND NO LOAD
TEST
The power measured in no load test is
core loss and power measured in
blocked rotor test is copper loss.The
efficiency is maximum when core loss
is equal to copper loss.

4. STARTERS
 The starters used in induction motors are
star delta starter ,DOL starer and auto
transformer starters.The torque of
induction motor is
 K1e2^2R2/R2^2+x2^2.