Why does a Brushless motor (BLDC) have 3 Wires

Brushles motors are quite complex in how they operate. The speed control is completing thousands of functions per minute just to keep up with all the action. 3 Wires on a Brushless motor are necessary, but why? Hint - the wires purpose is changing many times per second and does not stay constant.

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As mentioned in the video, here is the link for key differences between Delta and Wye winds:
   • Brushless Motor Kv and Kt of a Wye vs...  

How to Avoid the Biggest RC Motor Mistake.
   • How to Avoid the Biggest RC Brushless...  

Actual vs Calculated Motor Torque:
   • RC Brushless Motor Actual vs Calculat...  

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