Rotary Renewable Generation

Image from Licence Details: Rotary Renewable Generation

Turning common induction motors into efficient, economic, low-maintenance, gearless electrical generators

Developed by world-class researchers from the University of Oxford Department of Physics

How it works

  • Renewable energy source drives induction motor
  • Automatic mechanical impedance matching of the motor to a source
  • Motor’s inherent magnetic non-linearity exploited
  • Optimum power harvesting over a range of speeds


Successful scaled-down 10 kW wind turbine prototype with thousands of hours of maintenance-free operation



Utilises Existing Induction Motor Technology

  • Highly cost-effective and competitive
  • High-performance motors optimised through years of engineering
  • Scalable: Induction motors available from 1 kW to over 10 MW sizes
  • Rugged and Reliable: Capable of working in harsh conditions
  • Low maintenance: Only two moving parts
  • No rare-earth metals
  • No corrodible commutator


Quality Product with Improved Community Acceptability

  • Noiseless electrical gearbox
  • Replaces noisy, vulnerable mechanical gearboxes
  • Automatically extracts maximum available power
  • Efficient, cost-effective power from wind or water
  • On- and off-grid generation High community acceptability
  • Urban planning friendly
  • Reduced head weight

Patents Granted: Brazil; China; Europe; India; & US



The Grid

  • Integration into the grid
    Achieves UN SDGs: Goal 7, Goal 9, Goal 13



  • Drives heating systems: domestic; agricultural; horticultural; and general commercial
    Achieves UN SDGs: Goal 9, Goal 13


Thermal Energy Storage

  • Surplus electricity heats water
  • Compensates for supply and demand fluctuations
    Achieves UN SDGs: Goal 7, Goal 9, Goal 13


Pumped Hydroelectric Storage

  • Surplus electricity pumps water to an elevated tank
  • Compensates for supply and demand fluctuations
    Achieves UN SDGs: Goal 7, Goal 9, Goal 13


Water Purification

  • Electricity heats water
  • Water diffuses through the membrane and condenses
  • Impurities removed
  • Clean, drinkable water produced
    Achieves UN SDGs: Goal 6, Goal 9


Achieves UN Sustainable Development Goals: Goal 6 Clean Water and Sanitation; Goal 7 Affordable and Clean Energy; Goal 9 Industry, Innovation and Infrastructure; Goal 13 Climate Action.


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