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

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A4 A A Buck Chopper Shown In Fig A4 Is Fed By A 600 V D C And The Motor Has The Following Circuit Parameters Arm 1 (42.74 KiB) Viewed 22 times

A4. (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 la = 100 A • Armature resistance R. = 0.05 12 • Duty cycle = 0.6 • back e.m.f constant kaf of the motor = 0.398 V /rpm + o RE R w Vs E 000 LI Fig. A4 (i) Evaluate the output voltage of the chopper. (ii) 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) (ii) Range of motor speed, (1 mark) (iii) Motor torque, and (1 mark) (iv) Motor power. (1 mark)