HIGH-SPEED ROTOR

A rotor for a fiberising apparatus comprising a rotor housing; a drive end and a non-drive end bearing assembly, wherein each bearing assembly comprises a plurality of ball bearings, each seated in a respective bearing seat; a substantially horizontal shaft rotatably mounted between the drive end bearing assembly and the non-drive end bearing assembly; a drive end damper ring connected to the drive end bearing assembly and a non-drive end damper ring connected to the non-drive end bearing assembly, wherein each damper ring comprises one or more resilient dampers arranged in an annular ring, wherein the or each resilient damper is connected at a first end to the bearing seat and connected at a second end to the inner wall of the rotor housing; characterised in that the stiffness of the drive end damper ring is greater than the stiffness of the non-drive end damper ring.