Bremen, September 2010. – Lloyd Dynamowerke GmbH & Co. KG (LDW) have delivered the last of a total of 61 direct current (DC) motors for use in seven deep-sea drilling rigs to Flowserve Hamburg GmbH. The assembly of the oil platforms occurs at a shipyard in the Far East. Three of seven rigs have already been put into operation.

Each drilling rig is equipped with eight positioning drives with an output of 2610 kW during continuous operation or 2870 kW for two hours. Four of these drives are in operation while the remaining four are redundant and held ready for safety reasons. Additional machines have been requested by the operator as spares. The LDW motors with a frame size of 900 mm are assembled to azimuth gear boxes to drive the rigs’ propellers. All together, the order comprises a volume of 15 million Euro.

LDW produces special machines for areas of application that have particularly high demands for efficiency and reliability. These include, for example, shipbuilding, the energy sector, the petrochemical industry and mining. In this case, the drives were delivered in a vertical construction design with cooling by a radial fan. In addition, each motor is equipped with an air-water heat exchanger which cools the air in the thruster room. This is necessary to offset the heating effects of hydraulic aggregates in those rooms.

Technical data in overview:

Motor model: G5L900M34C+LWK
Output: 2610 kW of continuous operation or 2870 kW for 2 hours
Voltage: 750 V - 3660 A or 4030 A
RPM: 20 - 720 / 800 rpm
Construction design: Vertical (IM V1)
Cooling: Radial fan
Total weight: 19.5 t per motor