Leading offshore wind turbines well into the 20MW+ classes
 


The key characteristics of the MegaTorque Drivetrain Concept   


  The VerVent MegaTorque 20 drivetrain main benefits summary: 

  1. Cost-effective fully modular and ‘easy’ scalable ‘ultra-high’ speed geared drivetrain with competitive ±145Nm/kg gearbox torque density level, minimized rotating elements and primary use of journal bearings.
  2. Drivetrain built around compact central structural element to which all other main drive components plus left and right gearbox housings are mounted.
  3. This innovative design approach enables largely independent scaling of the first left-side stepped or stepped gearbox part, the second right-side bevel-gear part, and third bevel-gear integrated planetary gearbox part.
  4. Modular design with vertical split between stepped and bevel gear parts, allowing easier more cost-effective assembly, disassembly, and up-tower repairs/component exchange without requiring jack-up deployment.
  5. Higher step-up ratios allow substantially reduced bevel gear unit dimensions, mass, and costs
  6. Achievable stepped gearbox part step-up ratio from about 1:15 (by minimized ring gear diameter being a major cost driver) up to 1:22…25.
  7. Fully modular drivetrain concept allows ongoing scaling to 20MW+ with matching 215 – 2XXm rotor sizes, and unparalleled flexibility in choosing optimal gearbox ratios and generator speeds for maximum LCOE performance.
  8. Patent-pending drivetrain solution effectively prevents non-torque loads originating from the load-carrying gearbox housings to enter and negatively impact functioning and lifetime of critical gearbox internals.
  9. Parts and bearing count comparable to a medium-speed geared drivetrain with two-stage planetary gearbox, whereby VerVent √ 20 comes with a much smaller lighter and cheaper conventional PMSG.
  10. Likely no additional components will be required for scaling the drivetrain between a 12 - 20MW range. 


Key figures  MegaTorque 20

Planets

Up to 6; from 12 - 20MW+ and 215 - 235m+ rotor reference design


Step-up ratio

At least 1:22 […25]


Limiting factor(s)

Mainly size and cost stepped gearbox ring gear


Critical interfaces

Minimized if any enabled by tool carrier principle and flanged component connections


Modular

Fully; ‘Left’ and ‘Right’ sides seen from central carrier; scaling up and downward


Scalable

Based on current insight at least up to 24 – 26MNm


Housing split

3x; left + right sides and central carrier


Serviceability

State-of-the-art for offshore; up-tower repairs enabled


Journal bearings

Most bearing positions, except two ‘easy-to-access’ positions


Mass

±145Nm/kg and ~110T* for 12MW reference turbine with   16.3MNm input torque


Size

Compact and competitive


Cost

LCOE competitive