- 16 Vf Eg 11 Rf Ra La M Q Vb A Circuit Vch Ib Rb A Dc Dc Converter Is Used In Rheostatic Braking Of A De Separa 1 (45.24 KiB) Viewed 30 times
- 16 Vf Eg 11 Rf Ra La M Q Vb A Circuit Vch Ib Rb A Dc Dc Converter Is Used In Rheostatic Braking Of A De Separa 2 (246.6 KiB) Viewed 30 times
A dc-dc converter is used in rheostatic braking of a de separately excited motor, as shown in Figure 15.20a. The armature resistance is Ra 0.05 . The braking resistor is R₂ = 5 M. The back emf constant is Kv 1.527 V/A rad/s. The average armature current is maintained con- 150 A. The armature current is continuous and has negligible ripple. The field cur- 1.5 A. If the duty cycle of the dc-dc converter is 40%, determine (a) the average voltage across the dc-dc converter Vch; (b) the power dissipated in the braking resistor Pb; (c) the equivalent load resistance of the motor acting as a generator, Req; (d) the motor speed; and (e) the peak dc-dc converter voltage Vp. stant at la rent is If = = = -