Answer Happy

AY-connected, 440 V, 20 kW, 50 Hz, eight-pole induction motor is connected to a mechanical load as shown in the diagram below. The machine single-phase equivalent parameters are given in the table below: Parameter Value 0.5 ohms Stator per phase resistance 0.9 ohms Stator per phase leakage reactance 3-Phase Induction Motor Load-Torque 40 Nm) 30 ohms Magnetizing reactance Core resistance 100 ohms Rotor per phase resistance 0.3 ohms Rotor per phase leakage reactance 0.5 ohms At some operating point the load torque is given as 40 Nm with a rotational speed of 730 RPM. wrm Assuming steady-state conditions, and ignoring mechanical losses (windage and stray), find: a- The power required by the load. bThe torque that needs to be supplied by the motor c- The frequency of the rotor three-phase voltage and currents (in Hz). d- The rotor copper losses e- If the stator voltage is 440 V (line to line), find the stator current. f The efficiency of the motor at these conditions, ignoring the core losses.