Centurion Dynamo Core

Found in Dwemer ruins all over Skyrim as well as on the bodies of Dwarven Centurions, serving as their power source. They are little more than trinkets, trophies, or vendor junk due to their relatively low weight, intriguing looks and high value. They can be used at the Atronach Forge but require a Sigil Stone prior.

Note
The Centurion Dynamo Core make very interesting shelf displays in your house. They have a red aura emanating off them and the ball in the center constantly rotates.

about 3 can be found inside centurion in blackreach this is one of the fastest way's to get them since blackreach great lifts are direcktly conected to the surface  and the centurions are locaded close to the lifts  just make a degree of 360 and you wil  see one.