A
fluid supply system (10), comprising: a hollow shaft (12) configured to be rotated, the hollow shaft (12) having a
peripheral wall (14) defining an inner hollow space (16) extending along a longitudinal axis (18) of the hollow shaft (12); and at least one
fluid supply unit (28) for
coupling a stationary
fluid supply to the hollow shaft (12), the at least one fluid supply unit (28) being configured for supplying a fluid through the inner hollow space (16) of the hollow shaft (12) and including a first element (30) extending at least partially around the hollow shaft (12), wherein the first element (30) is fixedly connected to the hollow shaft (12) for rotating together with the hollow shaft (12), a second element (32) coupled to the first element (30) and being configured for staying stationary during rotation of the hollow shaft (12), a first fluid channel (36) provided in the first element (30), the first fluid channel (36) being aligned with an opening (38) extending through the
peripheral wall (14), a second fluid channel (40) provided in the second element (32), a toroidal fluid compartment (42) provided at least partially within the first element (30) and / or the second element (32), wherein the toroidal fluid compartment (42) is fluidly connected to the first fluid channel (36) and the second fluid channel (40) for providing a fluid passage between the first fluid channel (36) and the second fluid channel (40), a sealing element (48) sealingly
coupling the first element (30) with the second element (32), wherein the sealing element (48) is configured for sealing the toroidal fluid compartment (42) against an environment of the fluid supply unit (28), and a
pipe element (34) fluidly connected to the first fluid channel (36), wherein the
pipe element (34) extends along the inner hollow space (16) of the hollow shaft (12).