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Do brushless motors need a controller?

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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.Oct 31, 2018');})();(function(){window.jsl.dh('6','');})();(function(){window.jsl.dh('_HcKbYOjxMaqy0PEPiJu9wAQ43','
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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.

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