I am a member of a French yahoo group on 3D printing. Today a member posted a link to this nice brushless gimbal that he designed for the GoPro hero3 and posted on Thingiverse. he did not reference the controller he is using but he published the design files here.

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Comment by Andrew Rabbitt on June 29, 2013 at 10:51pm

Do these things use standard 3-phase brushless motors or are they wound as single-phase LAT's  (Limited Angle Torque motor)?

Comment by Craig Burden on June 30, 2013 at 3:00am

They are rewound to increase the resistance over the phases, resulting in a very fine control. They are still three phase.

Comment by Crashpilot1000 on June 30, 2013 at 5:55am

Sorry for a gimbal newbie question but wouldn't it be better to put the gopro lens in line with the rollmotor axis?

Comment by Craig Burden on June 30, 2013 at 6:19am
@Thomas, I'm not sure that I agree. Although I have zero experience with gimbals I have a ton on brushless motors and after a flight they aren't too warm. Now granted this is with substantial airflow, I don't think the plastic will cause too much problem. Also 3D printed plastic is fairly ridged and I think considering the fact that the parts used in the gimbal are rather small and short. I think it will be plenty strong. Anyway, I could be wrong on the heat thing.

Developer
Comment by John Arne Birkeland on June 30, 2013 at 12:23pm

If your motor is 160C you have bigger problems then the plastic melting..

Comment by Ben Norris on June 30, 2013 at 3:08pm

@crashpilot1000 visually the lens might need to be at the center but the gimble needs to be balanced around center of gravity.  If the motor was on the other side it could probably work out that these were closer to each other.

Comment by Ben Norris on June 30, 2013 at 3:09pm

presumably he did it this way because of the ports

Comment by Crashpilot1000 on June 30, 2013 at 3:38pm

@Ben Norris; Ah, ok. So you would need some extraweight ("Coins") for balancing then. Perhaps the off rollcenter lens is no real issue. Not having any gimbal at all I have really no real opinion on gimbaldesigns.


Developer
Comment by John Arne Birkeland on July 1, 2013 at 12:51am

The off center lens should have little or no consequence at the distances (mostly towards infinity) we operate with, when flying copters.

Comment by Charles lakins on July 1, 2013 at 4:47pm

My question is..are you using rewound motors for gimbal use?

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