[![enter image description here](https://i.stack.imgur.com/UPOYE.png)](https://i.stack.imgur.com/UPOYE.png)

If I have 3 gears meshed with a gear in the center of the 3 gears as shown in the picture. all of those 3 gears are connected to different power sources. They are free to rotate in the same direction and they have different torques and speeds (sometimes zero but never in a different direction). My question is, will the gear at the center has a torque equal to the summation of the other 3 gears? If not is there a certain set-up that can accumulate the torque of multiple gears. Note: my purpose is to generate electrical power using a compact set-up of gears if every gear has a different mechanical power source. I am trying to avoid 3 electrical generators if I can because I don't have too much space.