You can just use a slip ring[1] at one or both ends (along with a whole bunch of axial thrust bearings, I imagine). There are some neat (and very non-RoHS) sli

You can just use a slip ring[1] at one or both ends (along with a whole bunch of axial thrust bearings, I imagine). There are some neat (and very non-RoHS) slip ring implementations that use a series of liquid mercury filled channels to sidestep the brush wear issue, but I don't know that would be useful here, based on rotation speeds. [1] https://en.wikipedia.org/wiki/Slip_ring https://en.wikipedia.org/wiki/Slip_ring