I'm using 30A Opto 2-4s LIPo Blheli-S ESC for my drone. And I'm currently confused about how to connect the BLDC motor to the ESC. I found nothing online that currently explains the type of connections for my ESC type.


MOTOR: A2212/6T 2200KV




1 Answer 1


The signal generated by the ESC is a sine wave, where between each of the three output wires there is an phase difference of 120°.

I suggest you use some connector to solder on the ends of the wires and on the ESC output. Then, you simply connect a motor wire to an ESC output. If you don't have or don't want to use a connector, just solder.

When turn on, if the motor turns in a direction you don't want, you have two options:

  1. Configure the radio/controller to invert the ESC signal

  2. Exchange two ESC or motor wires between them

For exemple:

The motor wire are M1, M2 and M3, and the ESC output is ESC1, ESC2 and ESC3. So, connect:




If the motor turns in a direction you don't want, exchange the connections like:




  • $\begingroup$ I'm looking for the connection guide. In a picture I found online they connected the middle(black) to the end of ESC and the yellow to the end of ESC. Is that the proper connection to make or do I have to connect all the wires in serial $\endgroup$ Commented Jun 17, 2021 at 17:40
  • $\begingroup$ You must connect the wires individually, not in series or in parallel. Look this tutorial. $\endgroup$
    – Arcaniaco
    Commented Jun 17, 2021 at 17:43
  • $\begingroup$ Yeah, this is the picture I'm talking about. Are those the correct way to connect the Opto esc to the motor. What about the reverse rotations? $\endgroup$ Commented Jun 17, 2021 at 17:47
  • $\begingroup$ Exchange the motor input wires in the ESC output wires. I will update the post with a exemple. $\endgroup$
    – Arcaniaco
    Commented Jun 17, 2021 at 18:39

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