This modular coil is intended to be used in motor and generator applications, and features a 3D printed structure to wind your copper about as well as a series of ferromagnetic machine screws and ...

But when he shows the ends of the core, you’ll see that the side that attracts aluminum has a copper ring embedded in it. The coil is fed with AC. The magnetic field from the coil induces an ...

and a Lego generator built with neodymium magnets and copper wire coils. The result? A 3-phase electrical output with a surprisingly smooth signal and high voltage. While the generator's current ...