Page 35: of Maritime Reporter Magazine (May 2000)

Alstom, USN Team For Integrated Solution

Alstom Drives & Controls has worked with the U.S. Navy (USN) to produce an electric power and propulsion system which is compact and robust, while meeting exacting and demanding USN standards.

Traditional Navy practice in the realm of ship and equipment development and procurement has largely flown out the window in lieu of investigating and incorporating proven product and sys- tem technologies from commercial ori- gins, with a hard-line stance on initial and life-time costs. The benefactors of the "new" attitude is obviously the USN, which has been able to steadily drive down costs while sacrificing little if anything in performance. In addition, it has opened new markets for key compo- nent and systems manufacturers once locked out of this lucrative work.

Traditional USN practice has seen the use of mechanical transmission systems, utilizing either nuclear, diesel or gas tur- bine prime movers. Until recently, elec- tric propulsion was ruled out for many

Navy applications because the DC elec- tric motor has various design limits, including power limitations. In planning the new propulsion module for its future ships, however, USN is now considering electric propulsion for specific techni- cal, commercial and operations reasons.

Electric systems could potentially help the Navy optimize budgets in some applications. For example, a typical

Navy vessel run at less than 50 percent full power most of the time, a condition ripe for the benefits of an electric sys- tem. Electric systems can also be designed for silent operation, critical in today's stealth-stringent environment.

In addition, electric propulsion offers ship designers the flexibility to achieve a compact overall machinery layout, a design which can obviously be more resilient to damage.

Alstom Drives & Controls propose a customized AC induction motor, to fit the tight available space, with the added benefit of a novel PWM converter design to suit either an induction motor or a future permanent magnet motor.

The Alstom system is desirable as the company can act as the single-source provider for all power generation and vessel propulsion, helping to ensure smooth integration. All products in the

Alstom suite is the result of thorough and effective design to satisfy the ele- ments of shock loading. Generator units are resiliently mounted to withstand 15g above resilient mountings and even the converter suites, with their delicate elec- tronic components, can withstand the shock loading attenuated by resilient mounts. The propulsion motorsare designed to withstand mounting foot shocks up to 80g.

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