It is required to drive a d.c. shunt motor at different speeds in both the directions (forward and reverse) and also to break it in both the directions which one of the following would you use ?
a dual converter
a dual converter option is correct.
Running a dc shunt motor at variable speed in both directions with regenerative braking in both directions is a four-quadrant operation. A dual converter, consisting of two fully controlled bridges connected in anti-parallel, can deliver motoring and regenerating current of either polarity, giving all four operating quadrants without mechanical reversal.
A half-controlled bridge cannot regenerate (no negative output voltage). A single fully controlled bridge can invert but cannot reverse current polarity, so it only reaches two quadrants. A diode bridge is uncontrolled and gives only unidirectional operation.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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