Quadcopter continuously yaws due to one motor rotating in opposite direction

Hardware Vendors CubePilot/ProfiCNC/HEX
1

We’ve built a quadcopter, and mechanically everything looks solid. The frame is balanced from all sides, motors and other hardware components have been checked multiple times, and ESC calibration as well as software setup are done properly.

However, we’re facing one strange issue: three motors rotate correctly, but the fourth motor rotates in the opposite direction, causing the quadcopter to continuously yaw in one direction, as shown in the video.

We’ve already tried swapping motors and ESCs multiple times, but the problem still persists on the same arm.

Could someone please help us understand why this is happening and what we might be missing?

Any insights would be r "ly appreciated. Thanks!

Video link:https://drive.google.com/file/d/1OiGrKm7FM9naL0a5BlWQQL_sQkcuMsau/view?usp=drivesdk

2

Well, the answer is to swap any two of the phase wires on that motor. If you are using BLHeli, Bluejay or AM32, you can also change motor direction from their configuration softwares.

Also I see some ESCs dangling from the arms. Secure them tight. Also secure any other loose wires. They WILL contribute to vibrations

2 Likes
3

In the video we can see that sometimes it yaws clock-wise, sometimes it yaws in counter-clock-wise direction.

Use the motor test feature to make sure all motors are running in the correct direction. And that the props are correctly mounted. 2 props must be CW props and 2 must be CCW props. Are you sure you mounted the props correctly?