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A drive whose torque capability is constant below base speed and whose power is constant above it is described as having

  • A.two operating regions
  • B.a single constant-torque region throughout its whole range
  • C.a single constant-power region throughout its whole range
  • D.no defined torque capability at any speed

Answer: A

Below base speed the flux is held and rated current gives rated torque; above it the flux falls and the torque falls with it while the power stays at its ceiling. Every dc, induction and synchronous converter drive behaves this way.

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