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2. A dc chopper is used for regenerative braking of a separately excited dc motor. The...

2. A dc chopper is used for regenerative braking of a separately excited dc motor. The dc supply voltage is 400V. The motor has ra=0.2 ohms. Km=1.2 V-s/rad. The average armature current during regenerative braking is kept constant at 300A with negligible ripple.
             For a duty cycle of 60% for a chopper , determine
a) Power returned to the supply.
b) Minimum and maximum permissible braking speeds and
c) Speed during regenerative braking.

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Reference Book: Power Semiconductor Drives By S. Sivanagaraju

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