Discussion
Sensorless control of a synchronous machine infers the rotor position from
Answer: C
Correct answer: the machine’s own voltages and currents
Sensorless schemes estimate the position from quantities the drive already measures. At moderate and high speed the back emf is estimated from the terminal voltages and currents and integrated to give the flux angle; near standstill, where that emf vanishes, high-frequency signal injection is used instead, exploiting the machine’s magnetic saliency. Removing the encoder saves cost, cabling and a failure point in hostile environments.
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