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Above base speed a drive can deliver

  • A.neither torque nor power of any useful magnitude
  • B.constant power with falling torque
  • C.constant torque with rising power
  • D.rising torque with constant power

Answer: B

The voltage ceiling forces the flux down as the frequency rises, so the torque available for a given current falls in proportion. The product stays roughly constant, which suits a load whose torque requirement falls with speed.

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