A three-phase Y-connected, 220-V, 8-pole, 50HZ, slip ring induction motor has the following parameters: R1=0.5 N, R'2=0.45 N, Xeq=4 2 The motor is loaded by a 25 Nm bidirectional constant torque. If the load torque is reversed ( the machine is operated in the second quadrant of speed torque characteristics of induction motor). • Calculate the motor speed • Calculate l'2, the losses in the windings and the power delivered to the electrical supply. Draw and label the speed torque characteristics and show all operating points.

A freewheeling DC motor is driven with 1000 rpm and a nominal load torque of 80Nm. The field circuit resistance is 200 and the armature circuit resistance is 0.2 O. The field coils are fed with a zero degree transmission angle through a single-phase fully controlled converter connected to a single-phase 240V source. The armature circuit is fed from a single phase 400V source through another fully controlled converter. Magnetic saturation has been neglected, the motor constant is given as 0.8 V - s / A - rad. Assuming that there is no fluctuation in armature and field current, find the control angle of the converter feeding the armature at nominal load. If you want to leave the question blank, click again on the option you marked.

An 8 pole, 50 Hz slip ring induction motor runs at a slip of 2.67% on full load. The rotor resistance per phase of the winding is 0.2 ohm. What external resistance per phase must be added in the rotor circuit so that the motor now runs ate a slip of 17.33% such that the torque remains same in both the cases. (Ans: 1.1 ohm)

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