Why do brushless motors have 3 wires?

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There are three wires coming from a brushless motor. Inside, all three wires are connected, and wound such that passing DC current through any two connections will create a magnetic field, making the rotor turn a partial revolution. The computerized electronic speed control “commutates” a brushless motor by switching which two wires are being energized in a sequence.

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Author: : https://forums.traxxas.com/showthread.php?510413-Why-do-brushless-systems-have-three-wires-to-the-motor