I've had the idea to travel to the sun to collect huge amounts of energy. But how to store the energy and bring it back to earth? One possibility would be to st

I've had the idea to travel to the sun to collect huge amounts of energy. But how to store the energy and bring it back to earth? One possibility would be to store it as rotational energy, and that would mean to attain a high number of revolutions/sec (or alternatively do that with the spacecraft itself). But I'm by no means an expert, so I want to ask: Could magnetic tools like these be used to in-/decrease rotation and keep it stable? Maybe in a setup comparable to quadcopters to control the rotation of the overall system?