Page 38: of Maritime Reporter Magazine (August 2012)

The Diesel Engine and its Torque Unfortunately a diesel engine requires acertain low speed (idling speed) to run in- dependently. Below this lowest speed the engine has no torsional force: it dies! Inaddition, at idling speed the combustion engine supplies no torque. But low engine respectively propeller speeds are essential for particular drive conditions. Also the very often common installation of transmissions helps some-what to nothing. The attached power- torque-diagram of a modern ships dieselengine shows very plainly that, not until an engine speed of around 40% of therated speed, is there a noticeable torquestarting. For many drive conditions, such as fre- quent lock passages, long channel pas-sages, maneuvering support by tugs and AHTS, high torque at lowest propeller speeds are essential.Low Speed, High Torque Here comes the new drive concept of TORQUE Marine IPS on the table. With this diesel electric drive, gensets and electrical drive units, the necessary low propeller speeds are reached exactly as required. The reason for the extreme low propeller speeds are based in the hightorque of the permanent exited drive units. The Torque-Motor supplies its full torque already from the first rpm over the entire speed range (see diagram). This high torque is generated by the Torque- Motor directly; it is developed from re- ciprocation between magnets and therunnier current through the stator wind-ing. This drive system offers an almost wear- and maintenance free operation And as a specific ?treat? customers re- ceive fuel and emission reductions on top. www.torquemarine.de 38Maritime Reporter & Engineering News TECHNICAL FEATURE PROPULSIONPower characteristics of a modern diesel in the range of up to 4,300 kW. MR#8 (34-41):MR Template 8/10/2012 2:18 PM Page 38