I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps:
As an example, let's assume we have multiple windmills, each of them producing torque, but each of them produces different amounts of torque, because they are not equally exposed to wind.
Now, how could one mechanically build some DIY gears and hacks to accumulate the energies/torques of the windmill-outputs together, without having back-effects to the windmills?
I want ONE output gear, which has the summed-up energy of all input-gears (windmills), and when input-gear-1 would turn the output gear faster than the input-gear-2, input-gear-2 should also be able to add its torque to the output-gear (instead of acting rather as a brake for the output gear).
I can't imagine that such a simple idea/problem has no solution yet in 2019, but I have to add that I am a complete noob in mechanics.
Important: I forgot to mention that I want to build this WITHOUT electricity or the use of any motors. Think in terms of plastic-garden windmills. Little, wooden or plastic gears. Is it possible to achieve this with plain mechanics? (No electricity or magnetism involved?)