Comments for Brushless DC Motors

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by: Anonymous

The distinction between 'brushless DC' and 'brushless AC' is very simple:

BLAC: sinusoidal EMF.
BLDC: trapezoidal EMF.

A BLAC motor requires a high-precision position feedback device (encoder or resolver), whereas brushless DC can get away with simple hall-effect sensors for position feedback - it's only necessary to know which 60 degree (electrical) segment the rotor is in.

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