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Stena Estrid, prior to being floated out from Avic Weihai shipyard in January
Stena Estrid, prior to being floated out from Avic Weihai shipyard in January

Hybrid drivetrain scoops 2019 MP Efficiency Improvement Award

WE Tech claimed the Efficiency Improvement Award for its permanent magnet shaft generator and variable speed drive combination on Stena Line’s latest roro vessel

WE Tech claimed the Efficiency Improvement Award for its permanent magnet shaft generator and variable speed drive combination on Stena Line’s latest roro vessel

The hotly contested Efficiency Improvement Award was won by a variable-speed, permanent magnet shaft generator arrangement supplied by WE Tech to Stena Line’s E-Flexer series of roro vessels built at Avic Weihai shipyard.

The first in Stena Line’s new generation of E-Flexers, Stena Estrid, was floated out in January. Although the five earlier E-Flexers were already highly efficient, Finnish technology company WE Tech’s innovative configuration on the latest version makes further gains, contributing to a 25% reduction in CO2 emissions compared to current generation roro vessels.

The arrangement combines a variable frequency drive and permanent magnet shaft generator, along with a dedicated power management system. In power take-out mode, the system generates power for the ship’s electrical network. The shaft generator, driven by the main engine, can produce all the electricity required onboard without using fuel to run auxiliary generators when sailing. The variable frequency drive allows the main engine to run at variable speed while producing electricity onboard.

“Stena Line has put the latest technology in its Chinese newbuilds and we will continue to add more innovations in the future”

The concept drew plaudits for building on well-established energy saving principles, with a novel application of permanent magnet technology. One judge praised the WE Tech system on Stena Estrid as a “good basic concept for a hybrid propulsion train” that could easily be extended with the addition of energy storage. Another highlighted it as “a real-life example of the extended use of permanent magnets” beyond their established uses in thruster and winch motors.

Stena Line fleet manager Bob Brouwer received the award with WE Tech sales manager Peter Lindström. "Stena Line has put the latest technology in its Chinese newbuilds and we will continue to add more such innovations in the future," Mr Brouwer said.


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Maritime Air Pollution Conference, Europe

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