Problem with an ESC

[Davidars]

Hello,

I'm controling my quad using a raspberry Pi and the PWM main frequency output is 333Hz.
I have a rotor turning slowlier than the other one. I swap the motor to confirm the ESC is really the source of the problem.
I looked at the specs at hobyking site and realized the PWM signal is supposed to be 8KHz on this ESC.. far away from the 333Hz of my Raspberry Pi output!
Could it be the reason of my problem from you experience? Why the 3 other ESC seems respond correctly?
Here is the ESC I'm using:
Turnigy Multistar 20 Amp Multi-rotor Brushless ESC 2-4S (OPTO)
Here is a short video showing the blade turning slower:
https://drive.google.com/file/d/0B5pq1NPGcXasaFIwNGlLSE41aDg/view?usp=sharing

I open a case with Hobby King.... but it seems only the name is King. Doesn't seems to know their products.

thanks
David

 

[holtneil]

Hi mate swap motor position and see if its the motor not the esc ,if it has a tight bearing it will turn slower, if it turns faster i replace esc