Subsea Variable Speed Drives

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Nebb develops and have qualified subsea Variable Speed Drives (VSD) for operations down to 3000 m.

Key characteristics:

  • Small - competing solutions are many times bigger.
  • Proven - thousands sold for onshore use.
  • Flexible - operates many types of motors: induction machines, permanent magnet and servo motors.
  • Robust - tolerate vibration, shock and electrical fluctuations. ISO 13628-6/API 17F.

Power transmission to subsea pumps and other power consumers are usually hydraulic from topside. In some cases, electric power transmission to a subsea motor is used, with a VSD placed topside.

Subsea VSDs have only been available for small electric motors so far, and this has limited the freedom of subsea process/production systems design. With Nebb's subsea VSDs, this limitation is gone.

Model 5.5 kW Subsea VSD for all motors 10 kW Subsea VSD for PMSM motors 55 kW Subsea VSD 100-400 kW Subsea VSD
Typical applications

Actuators - valve operations.

Small pumps - lubrication, hydraulics etc.





Pumps for hydraulics, grease, chemicals, etc.



Inputs for both 3-phase AC (230/400 VAC) and DC (325/560 VDC)


Automatic switching between power sources.

Active cooling - cool well stream before export or compression.

Medium-sized pumps - hydraulics, lubrication, chemicals etc.

Complete unit with power distribution and high capacity PLC module for process control.




ESP (electrical submersible pumping) - downhole pumping.

Water injection - for maintaining well pressure.

Condensate pumps.




Status Qualified. ISO 13628-6. Qualified. ISO 13628-6/API Standard 17F Ed. 4 (2017)


Qualified to ISO 13628-6,
incl. 1-year+ subsea test.
Concept development.
Photo  Photo of 4 kW Flex VSD


 Photo of 45 kW VSD used by Kongsberg  3D model of 1 MW VSD
References     Project reference  

Typical technical data:

  • Power: 0-100 kW
  • Input voltage: 380-500 VAC or 690 VAC 50/60 Hz
  • Operating depth: 0-3000 m
  • Qualification: ISO 13628-6/API 17F
  • Regulation control modes: Vector control with Speed feedback, Vector control open loop, V/F
  • Max Output frequency 500Hz
  • DC Choke integrated
  • EMC Filter integrated
  • Dynamic Braking Module integrated up to 75kW (option)
  • Overload according to IEC146 Class 1 and Class 2
  • Heavy-duty and Light-duty overload management
  • Safety Stop card in accordance with EN 954-1 (Cat.3)
  • Interfacing with the more common field bus: ProfiBus, CANopen, DeviceNet, EtherNet real.time GDNet, EtherCAT, EtherNet/IP

For more information on Subsea VSDs, please contact:

Per Morten Jørum
Department Manager, Electrical & Drives
+47 66908300