Wave & Tidal Power Drives


Direct Drive & Mono-radial Turbine Power Take-Offs 


  Inventor J. C. Hanna offers three innovative PTOs for wave or tidal energy developers.  End-users can select (1) the patented mechanical direct-drive PTO called the Hanna MultiDrive; (2) the Hanna Bi-directional Tidal Turbine or (3) a surface or subsurface power buoy that can be driven by three optional and proprietary Hanna PTOs.


  A fourth invention, the Hanna Impulse/Reaction Turbine, was sold to an established tidal developer in the UK in January, 2020. The patented turbine has a unique drive train which allows it to be utilized either as a wave energy converter or as a bi-directional tidal energy converter. 


  To help stimulate the emerging 'Blue Economy', a fifth invention, the Hanna Mono-radial wave turbine, has been consigned to be an 'open source' technology. It is offered to all global developers at no cost in order to jump-start R&D within the wave energy sector.  The turbine is ideal for providing low-wattage power to charge batteries on data collection buoys.  The Hanna Mono-radial wave turbine harvests energy from the up and down movement of ocean waves by means of the OWC (Oscillating Water Column) principle.  OWC technologies are the most mature and well-studied wave conversion systems in the marine energy sector.


  The patented MultiDrive, U.S. 8,745,981, is a mechanical direct-drive PTO which converts linear, bi-directional motion into a one-way rotary motion.  The MultiDrive PTO serves shore-based installations, surface buoys or subsurface power buoys that are hidden from view. The subsurface MultiDrive system is energized by pressure differentials that exist between the surface and the submerged buoy's lowest point.  This allows a wave's energy to be harvested efficiently without the need for complicated and expensive phase control strategies.  Because the entire wave converter is below the surface, it is never exposed to destructive storms; it can be built of lighter materials and uses a taught three-point mooring system.  These factors combined represent significant cost savings, lowering LCOE dramatically.


  Both the Hanna Mono-radial turbine and the Hanna MultiDrive PTO can be placed on breakwaters or jetties where they can be easily connected to the grid.  Environmental studies done on existing shore based OWC installations have resulted in FONSI (Findings of no Significant Impact).  Hanna shore based power plants will not interfere with marine life, maritime traffic, commercial fishing or recreational activities.


  For more information on the Hanna Mono-radial Turbine, the patented Hanna MultiDrive PTO or the Hanna Bi-Directional Tidal Turbine, go to Page Two by clicking HERE.     


     foreground: the bi-directional pneumatic Test Stand with experimental Hanna Mono-radial Turbine.  background: the original impulse/reaction Hanna Turbine and MultiDrive proof of concept models.