What does happen if tripled harmonics given to induction motor??

What does happen if tripled harmonics given to induction motor?? Correct Answer Fail to start

Harmonics in a 3ϕ induction motor:

• The frequency component having magnitude three times the fundamental are known as third harmonics.
• When input having triplen harmonics is applied to an induction motor, the three-phase is not displaced by 120° each.
• The phase displacement between all three phases is equal to 0°.
• Hence the rotating magnetic field does not develop and the motor refuses to start.

Additional Information

• When input having fifth harmonics is applied to an induction motor, the three-phase is are displaced by 120° each but in opposite direction to fundamental components direction.
• So, the motor rotates in the opposite direction with a speed reduced to one-fifth of the original value.
• When input having seventh harmonics is applied to an induction motor, the three-phase is are displaced by 120° each in the same direction as the direction of the fundamental component.
• So, the motor rotates in the same direction with a speed reduced to one-seventh of the original value.