Why does a Brushless motor (BLDC) have 3 Wires

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Published 2022-04-11
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...  

#RCexplained

All Comments (21)
  • Thank fuck! I’ve been scrolling YouTube for hours trying to figure out how to power a motor that I bought! Thank you!
  • @ferdautomaton9904
    NOW I understand what happened when I put power on one wire of my Ebike hub motor. It briefly spun then stopped immediately. Because the current was stuck at one place. Thanks for the lucid video.
  • @diy_rabbithole
    I FINALLY got what the fuss was about the back EMF. Everywhere I read back EMF was used to calculate the speed, but only now I am getting how it is actually done. Thankyou!
  • @tobiasei541
    Thanks, I learned something today! Good explication for understanding!
  • @bretgreen5314
    This is a fantastic explanation. You would be great in a classroom. Thank you
  • Gracias por la informacion me quedo muy claro tenia la idea que un cable era seĂąal Saludos desde Chile
  • Wow, this could have been SO much simpler with a simple animation or slideshow!
  • @jackdurden466
    I’m just trying to figure out if I can retrofit a brushless motor into my starter box, and what it would require to do so. If it can be done at all. My engines have such high compression the standard two 7.2v batteries cannot turn the flywheel. So I need to know what to do with the third wire? Do I need a small esc? Can I wire it like a brushed motor and run the 3rd wire to elsewhere? I am fairly, no, completely lost with the new brushless motor workings. Help!!
  • @hippiness1
    I admit, I'm coming in as someone who knows very little about brushless motors, but it would make a LOT more sense if C1 and B2 had the same polarity and B1 and C2 had the same polarity. If they do, the magnet would stop when it is pointing at A1 and A2 and that would trigger the pole reversal causing it to flip again thus rotating, but if it was really the way you have it drawn, the magnet would stop halfway between B1 and C1 on one side and halfway between C2 and B2 on the other side. I'm just going to assume you messed this up since what you are saying doesn't really make any sense.
  • Internet Said It Doesnt Matter How You Wire Your Brushless Motor. Just Flip 2 To Reverse Rotation. This Video Explained Why It Doesn't Matter. Cus All Widings End Up Alternating Thier "Jobs"
  • @Lehpurdzzz
    The thumbnail and right illustration is definitely just wrong, as can been seen in the signal graph of the 3 wires
  • @rhandycan1
    Why bosch drill 10.8v li model have only 2 wires out? But it is brushless
  • @sivananthan5833
    Is there any 2 wires BLDC motor is available in market? If yes, give me brief explanation how it was possible?