Part 1 (30 marks). Consider a 6-pole shunt DC motor rated for 240V, 1000rpm. Its armature resistance is 0.822 and its sh

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Part 1 30 Marks Consider A 6 Pole Shunt Dc Motor Rated For 240v 1000rpm Its Armature Resistance Is 0 822 And Its Sh 1 (49.67 KiB) Viewed 49 times

Part 1 (30 marks). Consider a 6-pole shunt DC motor rated for 240V, 1000rpm. Its armature resistance is 0.822 and its shunt field has 1000 turns per pole. Magnetisation curve obtained at 1000 rpm is given in a table below. a) (8 marks) The field current is currently set at 2A and the motor runs at 1000rpm. What is the torque developed by this motor? b) (12 marks) Without changing the torque, the field current was reduced by 10%. What is the new speed of the motor in rpm? c) (10 marks) Conditions are now restored back to part a): field 2A, speed 1000rpm. Now, without changing the torque, the armature voltage is reduced by 10%. What is the new speed of the motor in rpm? Ea (V) 95 150 188 212 229 243 Field mmf (A-turns) 500 1000 1500 2000 2500 3000