Hi,
Thats all I could in a quick search.
Tom... 
The motors I received from amazon has all same color wire that is red and blue .
The motor I got from Ali express has also all same wire color (red and black ).
I think the motors are all same type because when I give power they all spin clockwise.
But... you have said the motors are spinning in the correct directions. I hope we are talking about different experimental setups.
How do you accomplish this? Please draw the part of your circuit between the motor and the Arduino.
Also: is your IMU firmly (very firmly) mounted mechanically in relation to the motors? Any ability for it to move or vibrate will spell serious trouble in the air. It may not be your problem now. But it could be.
If you have four right-handed motors, you have no choice but to get two left-handed motors OR run two in reverse. It will work OK, probably, with the caveat that you will wear out the wrongly spinning motors sooner than they would wear out anyway...
Many enthusiasts run motors the wrong way, opinions vary but at least some report no trouble at all other than the wear thing.
In this hobby, YMMV.
a7
Hi,
If you have four right-handed motors, you have no choice but to get two left-handed motors OR run two in reverse. It will work OK, probably, with the caveat that you will wear out the wrongly spinning motors sooner than they would wear out anyway.
That is t he OPs problem he has 3 motors that NEED to run one way and another that NEEDS to run the other way.
One of the 3 motors is being forced to run reverse to what it is designed and hence does not run at the same speed.
Tom...
TomGeorge:
Hi,
That is t he OPs problem he has 3 motors that NEED to run one way and another that NEEDS to run the other way.
One of the 3 motors is being forced to run reverse to what it is designed and hence does not run at the same speed.
It's not clear that red/black are different to red/blue. I'd bet he has four CCW motors.
As you have discovered, standard is red/blue and white/black, with red and white being + positive to achieve rotation in the proper (designed for) direction. So red/black probably is a different red/blue coding.
But I will repeat: you can run these motors backwards, it will work, after a fashion, there are many people who do this as a matter of routine and out of necessity, they wanting to run a motor one way or the other on a whim whilst flying…
And again, the flight control software can compensate for this, within limits, even as it compensates for differences in motor wear, gear wear, propeller damages and so forth.
I am not convinced (yet) that the OP has actually managed to have the four motors spinning in the correct direction with the correct propellers.
If he did my "hop test" in post #9 and it performed correctly, his other observations make no sense. So I am in doubt about whether that simple test was done at all.
a7
The motors wire color is same for all motors that I have( i have bought motors from two websites (same model motor ) that is why one motor wire color is different) . As per my troubleshooting I think all motors that I have is CW I confirmed it by taking each motor out and giving 3.7v individually and they all spin clockwise. So in drone I reversed connection of two motors in order to rotate it counter clockwise.
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