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 4 kW Flex & 4+ kW Compact 45 kW / 55 kW 350-1500 kW
Typical applications

Actuators - valve operations.

Small pumps - lubrication, hydraulics etc.

Active cooling - cool well stream before export or compression.

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

ESP (electrical submersible pumping) - downhole pumping.

Water injection - for maintaining well pressure.

Condensate pumps.

Status Qualified. ISO 13628-6. Qualified to ISO 13628-6,
incl. 1-year+ subsea test.
Design phase.
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

Get whitepaper!

Download the whitepaper on our VSDs.

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