Leroy Somer motors have recently sailed through the stringent mechanical shock tests performed by QinetiQ, the UK Government’s defence research and development organisation. This now allows them to be supplied for UK defence contracts, building on the considerable reputation that they already have with many other European navies.
Aluminium motors up to 280 frame size were subject to tests performed according to the DEFSTAN 08-120 (NES814) and demonstrated the capability to withstand more than twice the required “g” forces in all directions whilst remaining fully intact and operational. As a result they qualify for use on Royal Naval vessels.
The tests were carried out on a simulated ship’s deck, without the use of large displacement mounts and were operational throughout the test. This meets the requirements of DEFSTAN 08-123 Data sheets 27 and 28 that specify all the requirements for shock and minimum ruggedness.
The aluminium motors capability to flex during the shock test is extraordinary as seen on the high-speed video footage made during the test. At no time was there a risk of fragmentation – one of the key requirements from the MoD for avoiding injury or damage from potential projectile sources.
The result of these tests means that Leroy Somer motors can be installed safely on suitably rated large displacement mounts in any location onboard a vessel, as long as the mounts are correctly loaded. The tests revealed that the motors could withstand more than twice the minimum shock levels required, even rigidly mounted and could therefore be mounted in areas determined to be subject to these levels without large displacement mounts if needed.
These aluminium motors are from the commercially available “off the shelf” range and are much lighter than motors traditionally used for this type of application. They have already been supplied for the Royal Navy’s T45 destroyer project.
There are locations however when even greater shock levels are required by marine designers and for this there are three further ranges of cast iron and steel motors. These have been designed to meet the arduous requirements of European navies as well as the exacting standards set by DCN.
In addition to high levels of resistance to shock, these include low noise levels and extremely low vibration levels for special ship specifications. The MNR motor for example is reinforced to withstand shock levels over 10 times higher than was required in these tests whilst remaining both intact and operational.
“We probably have the most comprehensive range and wider experience than anyone in the design and manufacture of motors for Naval applications in Europe. Coupled with our worldwide presence this makes us an obvious choice for the Naval market,” explains Ashley Galloway, commercial manager for Leroy Somer UK.