Energy efficient drives help bring the catch home in prime condition
The modern fishing boat is today a very high-tech piece of equipment that has been designed to optimise efficiency and bring home the catch in prime condition. Variable speed drives from Danfoss help the MV Fugløyhav save energy and secure the best price for its catch.
MV Fugløyhav, built at Vaagland’s yard in Norway, is typical of the modern fishing boat. At only 34m overall length and displacing 499 tonnes, nevertheless she’s packed with modern technology. Variable speed control of the hydraulic pumps that control the main steering gear, the refrigeration system which keeps the catch alive and fresh and the thrusters that positioning the ship perfectly when bringing the valuable catch onboard are all handled by Danfoss VLT® AutomationDrives.Power control with drives
The main propulsion unit driving the propeller is a diesel engine with a shaft generator supported by an auxiliary diesel generator set. These two generators between them provide the total electrical power throughout the boat, and particularly the many VLT®
drives that control the steering, thrusters and refrigeration plant.
Daniel Kvalvik of Elmarin, the contractor in charge of the thruster application, as well as all the electric installation on board says, “For the stern- and bow thruster we have used the Danfoss VLT® AutomationDrive series. Danfoss VLT® drives are easy to program, due to their intuitive and user-friendly Local Control Panel. Danfoss also offered us great support during the project”.
The soft-start characteristic of drive motor control is critical on marine applications as this limits the peak loading on the diesel generators. This means that smaller generator sets can be provisioned, a major benefit as there are always space limitations on-board small vessels.Precision rudder positioning
The Fugløyhav’s rudder is positioned using a rotary vane hydraulic steering unit. The dual-redundant reversible hydraulic pumps are each controlled by a 22kW VLT® drive, which enables precise analogue control and highly accurate rudder positioning. Since the rudder only comes into play when the boat is changing course, no energy is used at all while sailing straight ahead.