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Windflow’s synchronous power-train

A torque-limiting gearbox/low variable-speed system for wind turbines

December 2019
Gallery Windflow’s synchronous power-train 1
Gallery Windflow’s synchronous power-train 1


Windflow’s power-train and its synchronous generator enable wind turbines to provide physical inertia and system strength for grid stability.

Windflow's solution is a mechanical Variable Speed (VS) system called the torque-limiting gearbox/low variable-speed (TLG/LVS) system which leaves the generator speed constant (set by the grid) and has a differential (a planetary stage with one input from the wind turbine and two outputs) in the gearbox. One output from the differential drives the generator (constant speed), the other drives a hydraulic pump (variable speed). A hydraulic circuit controls the torque, while the turbine speed is controlled by pitching the blades. Together the hydraulic circuit and the blade-pitch control the power on the generator shaft, enabling it to be synchronous. Thus the important stability benefits of the synchronous generator can be retained while renewable penetration increases.

Label Date December 19, 2019
From New Zealand
Maturity stage Small scale commercialization
Looking For Licenses ; Funding ; Visibility

The environmental benefits

  • Avoid CO2 emissions expenses by up to 20%

The Financial benefits

  • Reduce wind turbine power train capital cost by 5%
  • Savings of US$20,000 per 2 MW turbine

Activity Region

  • /


United Kingdom,


New Zealand,

  • Headquarters
  • Activity

Company Profile

SyncWind Power Limited

We 'Synchronise the Wind' directly into the grid.
Synchronous Wind Turbine Design, Research & Licensing

View company profile
Headquarters Canterbury 8041, New Zealand

Related Topics

Contact the Solution Provider Add to Favorites

The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator SyncWind Power Limited has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.