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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
Apr 21, 2013, 07:21 PM
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brushless gimbal dreams

So you want the smallest possible brushless gimbal. The knowledge base about supported motors & payloads is increasing. People are lifting DSLRs now. There's a video of the inventor flying a small quad with one.

SimpleBGC test in wind (3 min 48 sec)

All the notes are in Russian. The days of the future being written in english are over. You can reverse engineer the following:

ROLL- RCTimer CF2805-14
PITCH - Turnigy L2205-1350

60 turns of 0.2 something wire in each motor. Presumably 0.2 millimeters.

BrushlessGimbal DSLR01 (3 min 38 sec)

He's monopolized the controller boards, but this has provided enough income for him to expand the gimbal to 3 axes & test new motors.

In this video, he showed much improved results from a 3 axis gimbal, so the 2 axis version is probably going to vanish from the blogs. More importantly, he used a cheap ass DT750 motor, with all its cogging. That opens the door to lots of cheap motors, if only the wire gauge & turns count can be found.

There are a lot of Towerpro 2410-9 motors in the apartment. They haven't been made in years, so there's no brushless gimbal info. They have 12 stators in a star winding. At 3A, they get hot but seem to have enough torque for a gopro.

The mane thing the gimbal motors are doing is converting the stock delta winding to a star winding. Star winding produces higher torque & lower speeds.

Whether to open source the controller & rely on the masses to improve it or monopolize the controller to make enough money to improve it yourself is a highly contested issue. Improvements to products have generally not come from masses of volunteers, but from 1 new guy among the masses taking up the idea & working alone. The same thing could be accomplished by transferring the monopoly rights to the new guy.

With no source code or probing of the alexmos controller, the mind starts hatching an idea where instead of using back EMF to time the motor voltages, the IMU is used, since that directly measures the shaft turn rate. It's probably not worth redesigning a $150 controller from scratch. The alexmos controller would probably work without modifying the Towerpro 2410-9's.

Open source brushless controller:
Last edited by Jack Crossfire; Apr 22, 2013 at 02:22 PM.
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