One of the simplest methods of
control for
dc brushless motors uses what is termed Trapezoidal commutation. In this scheme, current is controlled through
motor terminals one pair at a time, with the third
motor terminal always electrically disconnected from the source of power.
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With a BLDC motor, it is the permanent magnet that rotates; rotation is achieved by changing the direction of the magnetic fields generated by the surrounding stationary coils. To control the rotation, you adjust the magnitude and direction of the current into these coils.