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Uptower Solution

Generator Shaft Repair

Worn generator shafts machined back to agreed tolerances by a CNC machine mounted directly on the shaft - no generator replacement.

Request a quote How it works

Trusted by wind operators and OEMs across Europe and North America

  • Vestas
  • Siemens Energy
  • NextEra Energy
  • GE Vernova
  • Enercon
  • Nordex
  • EDF Renewables
  • Welcon
  • RWE
  • CS Wind
  • EEW
  • Muehlhan
  • Nicon Industries
  • Orsted
  • Cadeler
  • Vattenfall
  • Smulders
  • Windar
  • Titan Wind
  • SubC Partner
  • Semco Maritime
  • LM Wind Power
  • Iberdrola
How It Works

The Machine Turns.
The Shaft Stands Still.

Generator shafts get worn or damaged when bearing inner rings or couplings spin on the shaft - and replacing the generator is expensive and time consuming. Our fully CNC-controlled machine repairs the shaft in place instead.

How the repair works

The machine is mounted directly onto the shaft. It then spins around the stationary shaft, machining the surface and gradually obtaining the required, agreed-upon tolerance levels.

Why repair instead of replace

  • The shaft is repaired uptower - no generator removal or replacement
  • Functionality of the drivetrain connection is restored to agreed tolerances
  • Further damage development is stopped
Technical Specifications
Equipment Fully CNC-controlled shaft-mounted machine
Method Machine rotates around the stationary shaft
Tolerances Machined to agreed tolerance levels
Typical damage Bearing inner rings or couplings spinning on shaft
Repair location Uptower, in place
No Replacement The shaft is repaired in place - avoiding an expensive, time-consuming generator exchange.
CNC Precision A fully CNC-controlled machine gradually obtains the required, agreed tolerance levels.
Repaired Uptower The machine mounts directly on the shaft inside the turbine.
Damage Stopped Early repair stops further damage from rings or couplings spinning on the shaft.
Speak to an engineer

Get expert advice on your project

Send us your damage report or turbine type and we'll respond within one working day with an assessment and indicative quote.

+45 70 11 02 70 info@cnconsite.dk

Damage photos help - email them directly or attach them when we reply.

Global reach

Wherever your turbines stand

On site within days Worldwide call-out, 24/7. Technicians mobilize within days of a purchase order.
Onshore & offshore The same in-nacelle method works at sea - no offshore crane deployment needed.
Three continents A proven repair track record on wind turbines across three continents.
FAQ

Frequently asked questions

Can a worn generator shaft be repaired without replacing the generator?

Yes. A fully CNC-controlled machine is mounted on the shaft and machines it back to the required, agreed tolerance levels - in place.

How does the machine repair a shaft that cannot rotate?

The machine itself spins around the stationary shaft, gradually machining the surface to tolerance.

What causes generator shaft damage?

Typically bearing inner rings or couplings spinning on the shaft, wearing down the surface.

Related Solutions

More uptower services

Uptower

Private: Yaw Sliding Surface Refurbishment

On-site refurbishment of worn yaw sliding surfaces. No yaw ring exchange, no crane.

Learn more →
Uptower

Private: Yaw Gear Mounting Flange Repair

Worn yaw drive mounting flanges and damaged threads repaired uptower.

Learn more →
Uptower

Private: Brake Disc Repair

Damaged brake disc sections milled out and replaced uptower.

Learn more →
More wind turbine solutions
Blade Private: Blade Surface Milling Blade Blade Root Repair Blade Private: Blade Root Bushing Replacement Structures & Flanges Monopiles & TPs Structures & Flanges Tower Flanges Structures & Flanges Sea Fastening
All wind solutions →