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Sensorless vector control is chosen where

  • A.the load requires rated torque at exactly zero speed
  • B.the drive is required to run entirely open loop
  • C.a shaft sensor is impractical but performance is still needed
  • D.the drive must position to within a fraction of a revolution

Answer: C

Estimating the flux and speed from the terminal quantities gives much of the performance of a closed-loop drive without cabling a sensor into a hostile place. Performance falls away close to standstill, where the estimate has least to work with.

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