# How to connect Opto esc to BLDC Motor

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.

ESC: 30A BLHELI-S Opto

MOTOR: A2212/6T 2200KV

https://imgur.com/Pw4yxZI

https://imgur.com/bmSByHM

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:

M1===ESC1

M2===ESC2

M3===ESC3

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

M1===ESC3

M2===ESC2

M3===ESC1

• 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 Jun 17 at 17:40
• You must connect the wires individually, not in series or in parallel. Look this tutorial. Jun 17 at 17:43
• 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? Jun 17 at 17:47
• Exchange the motor input wires in the ESC output wires. I will update the post with a exemple. Jun 17 at 18:39