Novel rotary electrical contact eliminates reliance on rare-earth magnets for large-scale wind turbines

https://techxplore.com/news/2022-09-rotary-electrical-contact-reliance-rare-earth.html

"sliding contact and electrical arcing... limiting factors reduce performance rotary electrical contacts and lead to short operating lifetimes and high maintenance... Twistact... operating over the full 30-year service time of a multimegawatt turbine without maintenance or replacement. Other potential applications for the technology include synchronous motors and generators, electrified railways and radar towers. Twistact could also be used in replacing brush or slip rings in existing applications