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SUCCESSFUL TESTS FOR LARGEST SUBMERSED ELECTRIC MOTOR

Saturday, April 6, 2019 

A dredge pump motor for a newbuild Marine Aggregate Dredger, 'Cemex Go Innovation', currently under construction for Cemex Marine UK at Damen Shipyards , has recently passed a number of tests.

The pump motor, rated 1,400kW, is said to be the largest submersed permanent magnet motor employed to date. The dredger is designed for mining marine aggregates at 55m below sea level. The motor directly drives a submersed Damen dredge pump without a gear box in between. Moreover, the electric motor forms an integral part of the trailing pipe structure, normally operating at 25m below sea level.

At a specialised performance test facility the complete drive train, including the e-motor and frequency converters, were subjected to tests including a full power test, overspeed test at 120% of the nominal revolutions and a 130% torque test. All tests were concluded satisfactorily. The tests were closely monitored by the project team, including Cemex representative, the supplier Marotechniek and the Damen project team. Following testing, the equipment will be shipped to the Netherlands, where it will be fitted out with the dredge pump parts, and mounted into the trailing pipe system.

Cemex project manager Mark D Williams said: “I was impressed with the quality of the equipment on test.”

The air filled PM motor is smaller, lighter and more efficient than conventional asynchronous units, and offers measured efficiency of 97% including friction of all bearings and mechanical-seal. The electric motor is controlled by a water cooled AFE drive. The motor was designed in close cooperation between Marotechniek and Damen Dredging Equipment.

The hopper dredger MAD3500 Cemex Go Innovation is currently under construction at the Damen Shipyard in Galati, Romania. The dredging equipment is constructed by Damen Dredging Equipment in the Netherlands. The dredger will be used by Cemex Marine UK to mine aggregates in the British Channel and North Sea. The innovative dredger has a number of special features, including the PM pump motor.

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