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A single- phase full- wave rectifier is used to control the speed of a 5- hp,...

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Electrical Engineering

A single- phase full- wave rectifier is used to control thespeed of a 5- hp, 110- V, 1200- rpm, separately- excited dc motor.The converter is connected to a single- phase, 120- V, 60- Hzsupply. The motor has a winding resistance of 0.4ohms and aninductance of 5 mH, and a voltage constant K=0.09V/rpm.

a. During the motoring operation, the motor runs at 1000 rpm andreceives an armature current of 30 A. Determine the correspondingfiring angle and the power to the motor.

b. The polarity of the emf is reversed to get a regenerativeaction. Determine the firing angle required to keep the motor speedat 1000 rpm with an armature current of 30A. What is the power fedback to the supply under these conditions?

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