Question

Both questions go together

P6.8 A two-quadrant chopper, fed from a 400-V de source, supplies power to a dc motor whose armature resistance is 0.2 Ω. The armature current is to be maintained constant at 250 A, independently of the motor speed that affects the armature EMF. Find the magnitude control ratio of the chopper and duty ratio of the modulating switch when the armature EMF is (a) 320 V (b) -320 v P6.9 For the chopper in Problem 6.8, find the average output current when (a) the armature EMF is 200 V and magnitude control ratio is 0.6 (b) the armature EMF is -200 V and magnitude control ratio is-0.6

Answer 1

)320 V 400

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