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The chief disadvantage of the Ward-Leonard system is its

  • A.very poor speed regulation compared with a rectifier drive
  • B.cost, size and low overall efficiency
  • C.inability to reverse the direction of rotation of the driven motor
  • D.inability to provide any speed below the base speed of the motor

Answer: B

Three machines of comparable rating are needed where a converter of a fraction of the size would do, and the losses of each are cascaded. Its smoothness and four-quadrant capability were what justified it before power electronics existed.

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