Eddy current dynamometer for wind turbine testing

This dynamometer is based on the phenomenon of magnetic induction and is specially designed for measuring the characteristics of wind turbines. In fact, this is the equivalent of an electric generator with short-circuited windings. The resistance force is adjusted by changing the magnitude of the magnetic field. https://www.youtube.com/watch?v=RNPaZzP1N6Q https://www.youtube.com/watch?v=Bodt6ze6Wck
In addition to the printed parts, you will also need:
Neodymium magnets 12×5×3 mm. 14 pcs.
Ring from a copper pipe with a diameter of 38 mm., Length 14 mm., Wall thickness 2,5 mm.
Bearings 695z 2 pcs.
Bronze or steel shaft 2 pieces with a diameter of 5 mm. and bushings to the shaft with a diameter of 6.4 mm.
Metal sleeve - length 6mm. outer diameter 10.85 mm. inner diameter 5.05 mm.
Bolts M3 12 pcs. and nuts for them.
Fixing bolts without caps M2.5 mm. 5 pieces.
Soft spring for adjustment mechanism.
Studs M6 2 pcs. and nuts to them for fastening to a solid ba