A 450v , 25hp , 60Hz , four pole delta connected wound rotor induction motor has the following impedance in ohms per phase refered to the stator circuit . R1=0.641 R2=0.332 X1=1.106 X2=0.464 Xm=26.3
1: what is the maximum torque of this motor? At what speed and slip does it occur?.
2: what is the stating torque of this motor?
3: if the rotor resistance is doubled , what is the speed at which the
maximum torque now occur?