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Direct torque control differs from field-oriented control in that it

  • A.requires no measurement of the machine currents at all
  • B.can only be applied to a machine fed from a current source inverter
  • C.holds the torque of the machine constant at every speed
  • D.selects switching states directly from torque and flux errors

Answer: D

A switching table chosen from the errors and the flux sector replaces the coordinate transformations and current loops, giving very fast torque response. The penalties are a variable switching frequency and greater torque ripple.

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