Arrangement for pressurizing of fluid

A multistage compressor and pump system comprising:

• a central shaft comprising inboard motor winding and laminations;
• one or more inboard stages arranged axially adjacent with each other and radially around the central shaft, with an axis of rotation about the central shaft, wherein each of the one or more inboard stages comprise an inboard rotor, wherein the inboard rotor is driven to rotate about the central shaft by the inboard motor winding and laminations;
• one or more outboard stages arranged axially adjacent with each other and with the one or more inboard stages, and radially around the central shaft, with an axis of rotation about the central shaft, wherein each of the one or more outboard stages comprise an outboard rotor;
• and
• an outer shroud arranged radially outside of the one or more inboard stages and the one or more outboard stages and comprising outboard motor winding and laminations, wherein each outboard rotor is driven to rotate about the central shaft by the outboard motor winding and laminations.