Discussion
A dc machine used as a generator in a Ward-Leonard set is driven by
Answer: B
Correct answer: an induction or synchronous motor from the ac supply
A Ward-Leonard set has an ac motor driving a dc generator at constant speed, the generator’s field being varied to control the voltage applied to the drive motor. That gives smooth, stepless, four-quadrant control with regeneration, and it was the standard high-performance drive for half a century. Its drawbacks - three machines, poor efficiency, large floor space - are what static converters removed.
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