(a) A buck chopper shown in Fig.A4 is fed by a 600 V D.C., and the motor has the following circuit parameters. • Armatur

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A A Buck Chopper Shown In Fig A4 Is Fed By A 600 V D C And The Motor Has The Following Circuit Parameters Armatur 1 (93.42 KiB) Viewed 33 times

(a) A buck chopper shown in Fig.A4 is fed by a 600 V D.C., and the motor has the following circuit parameters. • Armature current 1,-100 A • Armature resistance Ra=0.0522 Duty cycle=0.6 back e.m.f constant kap of the motor = 0.398 V /rpm +o R, Rat Vs M Ea + 000 + 1 - Vf Fig. A4 (i) Evaluate the output voltage of the chopper. (ü) Evaluate the motor speed in rev/min. (1 mark) (3 marks) (b) Briefly describe the operating condition of armature voltage control on each of the following issues in DC drives. (i) Level of field current, (1 mark) (ü) Range of motor speed, (1 mark) (iii) Motor torque, and (1 mark) (iv) Motor power. (1 mark)