Discussion
The rotor position feedback of a brushless dc motor is commonly obtained from
Answer: C
Correct answer: Hall effect sensors
Three Hall sensors spaced 120 electrical degrees apart in the stator detect the rotor magnet poles and give six distinct states per electrical cycle - exactly the information the inverter needs to decide which two of the three phases to energise. They are cheap, robust and adequate for trapezoidal commutation. Higher-performance drives use an encoder or resolver, or estimate position from the back emf to dispense with sensors altogether.
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