Part 2 (30 marks). Now consider a 6-pole series DC motor rated for 240V, 1000rpm. Its armature resistance is 0.592, its

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Part 2 30 Marks Now Consider A 6 Pole Series Dc Motor Rated For 240v 1000rpm Its Armature Resistance Is 0 592 Its 1 (40.96 KiB) Viewed 49 times

Part 2 (30 marks). Now consider a 6-pole series DC motor rated for 240V, 1000rpm. Its armature resistance is 0.592, its series field resistance is 0.392 and its series field has 50 turns per pole. Magnetisation curve obtained at 1000 rpm is given in a table below. a) (15 marks) The motor runs at 900rpm and draws current of 61.5A. What speed and torque are developed by this motor? b) (15 marks) Without changing the motor 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