**Factors affecting the speed-torque characteristics of an Induction motor :**The speed-torque characteristics are affected by various factors like applied voltage, R

_{2}’ and frequency.

**(a)**We know that T ยต V

*Applied voltage*:^{2}. Thus not only the stationary torque but also the torque under running conditions changes with change in supply voltage.

**(b)**The major effect of change in supply frequency is on motor speed. The starting torque is reduced with increase in frequency.

*Supply frequency*:

**(c)**The maximum torque produced does not depend on R

*Rotor resistance*:_{2}’. However, with increase in R

_{2}’, the starting torque increases. The slip at which T

_{max}is reached increases too which means that T

_{max}is obtained at lower motor speeds.