Advantages of 3 phase induction motor:
1) Simple in construction.
2) Economical in cost.
3) Requires very less maintenance.
4) High efficiency.
5) Low maintenance cost.
6) Self starting.
7) Robust and mechanically strong.
8) High overload capacity.
9) Small capacity motors, less than 5 HP, don't need a starter.
Disadvantages of 3 phase induction motor:
1) Essentialy a constant speed motor and its speed cannot be changed easily.
2) Medium starting torque.
3) Very sensitive to fluctuations in supply voltage.
4) Separate starter is required for stating for high capacity (more than 5HP) motors.
5) Cause of low system power factor, especially when motors are operated below its full load capacity.
6) It takes a large current from line at instant of starting.
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