motor problems

[pspearn]

Ok I have finally completed my quad and i have an issue, the right rear motor is spinning slower than the rest no matter what i do. I have replaced the esc and motor, re-installed firmware and tried older versions, checked all of my connections. when i do try to take off it tries to flip backwards. when i throttle up with no props it looks like the motor is twitching and it makes a very faint clunking noise(i have tried three different motors they all do the same thing.) i have calibrated the esc's many times. also i don't know what this means but the problem motor is drawing more current then the rest at slow speed with props off. I have also re soldered everything just in case.
hopefully someone can help with some advice. Thanks in advance.

 

[holtneil]

Hi mate if you have put 3 different motors on and they all do the same it sound like the timing for the motor is wrong on the ESC , Lot of ESCs are programable , so you need to check the setting , Can you give me a link to what ESC you have
The other thing that does this is if you have lost a phase , ,Brushless motors are 3 phase so it you loose one it will twitch not spin
Have you tried that motor on a different ESC to narrow down the fault , Pug it in to an ESC that runs one of the other motors ok and see if the motor spins ok on that ESC

 

[pspearn]

http://www.robotshop.com/ca/en/uav-brushless-motor-a2212-13-1000kv.html that is the motor i have.
http://www.robotshop.com/ca/en/m30a-30a-multicopter-esc.html that is the esc.
yes i have tried it on the other esc's and it works fine i have also switched out the esc with a new one and recalibrated it with no luck. that is about the extent of my knowledge as far as troubleshooting goes.

 

[holtneil]

Hi there is not a lot of info on the motors and ESCs
Ok so motor is ok on one of the other ESCs so its not the motor ,is all the solder joints good on the ESC to motor,
Ok here is another test we can do put it all back as it was , Now the one motor should be playing up , un plug the esc from the board( bad motor) and plug it in to one of the motor pins that is working good( good motor set up) , then test what we are doing is testing the FCB to make sure all the motors are getting the same signal

 

[pspearn]

I will try that when i get home tomorrow and get back to you with the results, i really appreciate the help. thank you

 

[holtneil]

No Problem my friend , one thing I will say is when you post for help give as much info as poss the complete set up if you can, there items that can give the same problem all the time so its easier to see what you have and say yes thats what the problem is , any way chat tomorrow and can you let me know also what FCB you have

 

[pspearn]

It is an apm 2.6 with updated firmware to the newest version.

 

[holtneil]

Ok mate never used one ,but we can do that test and see what we find them move on from there

 

[pspearn]

so after trying everything i could think of and what was suggested to me, i swapped my fcb out with a buddys and everything worked fine...im going to order a new one. thank you for the help and im sure i will have more questions in the future.

 

[holtneil]

Hi mate glad you have found the problem good luck with the new one

 

[GJH105775]

Just curious, where did you get the FC,a and was it DOA?

 

[pspearn]

I bought it from ebay and it came from china,,,,yes it was doa.

 

[holtneil]

China clone

 

[GJH105775]

That is the problem with buying from China. I try to avoid it, but is hard. Japan does really nice on electronics though.