Compact, modular, pump or turbine with integral modular motor or generator and coaxial fluid flow

A modular sealless pump or turbine system, comprising:

• a plurality of pump or turbine modules including a first pump or turbine module and a second pump or turbine module, the first and second pump or turbine modules each respectively comprising:
• a module housing surrounding the respective module, the module housing having a first end and an opposite second end, the first end being open and the second end having a socket;
• a rotor suspended on a shaft within the module housing, the rotor disposed proximate the first end, and the rotor having a hollow protrusion;
• a motor within the module housing configured to drive a rotation of the rotor, or a generator within the module housing configured to be driven by rotation of the rotor, the motor or generator comprising:
• a stator within a sealed stator housing, the stator being axially offset from the rotor, the stator comprising at least one electromagnet directed axially and proximally toward the rotor, and
• a plurality of magnetic devices assembled in a magnet structure that is removably constrained to be axially fixed and rotationally cooperative with the rotor, the magnetic devices being configured by the magnet structure to pass in axial proximity to the at least one electromagnet as the rotor rotates;
• a flow path symmetrically distributed about the stator housing between the stator housing and the module housing, the flow path directing a flow of a working fluid between the first and second end,
• wherein the flow of the working fluid that flows through the flow path is required to flow through the hollow protrusion and the socket;
• the second end of the module housing of the first pump or turbine module being configured to form a first direct attachment with the first end of the module housing of the second pump or turbine module to close the open first end of the second pump or turbine module, and the first end of the module housing of the first pump or turbine module being configured to form an alternative second direct attachment with the second end of the module housing of the second pump or turbine module to close the open first end of the first pump or turbine module,
• wherein said first direct attachment includes inserting the hollow protrusion of the first module into the socket of the second module and wherein said second direct attachment includes inserting the hollow protrusion of the second module into the socket of the first module,
• the modular sealless pump or turbine system further comprising:
• an inlet having a second socket, the inlet configured to seal the open first end of either of the first or second pump or turbine modules and configured to allow the hollow protrusion of either of the first or second turbine modules to be inserted into the second socket;
• and
• an outlet having a second hollow protrusion, the outlet configured to directly attach to the second end of either of the first or second pump or turbine modules wherein the second hollow protrusion configured to be inserted into the socket of either of the first or second pump or turbine modules.