Torque-slip (Speed) Characteristics

Torque-slip (speed) Characteristics: The torque-slip or torque-speed characteristic, as per the equation derived earlier, is shown in Fig.(A). The slip is s=(w_s-w_r)/ w_s = n_s-n_r/ n_s= 1-(n_r/n_s). The range of speed, n_r is between 0.0 (standstill) and n_s (synchronous speed). The range of slip is between 0.0 (n_r= n_s) and 1.0 (n_r= 1.0)

fig.(A)Torque-slip (speed) Characteristics of induction motor

This shows that T_o∝ s, the characteristic being linear. The following points may be noted. The output torque developed is zero (0.0), ats= 0.0, or if the motor is rotated at synchronous speed (n_r= n_s). when the