Stadt Holding AS, Gjerdsvika

With a location in the middle of the maritime cluster on the west coast of Norway, STADTs aim has always been to develop power inverters for ship applications. In 1997, after several years of intensive developments, an innovative and very modern inverter series was launched. A major advantage of these inverters, was the very compact design due to effective direct water cooling. The first STADT delivery went to the Norwegian coastguard K/V Tromso. This was a breakthrough, and the business improved rapidly. The main business area for the new inverters, made in powers up to 3500 kW 690 V, was for diesel-electric main propulsion of ships, as well as offshore applications on oil rigs and for industrial use. Companies like TFDS - Hurtigruten, Geo Shipping, PGS, Sanco Shipping, Aker, Statoil, Hydro, BP and Bayer AG became regular customers. In 2001 the watercooled STADT IGBT-converter business, based on PWM technology, was sold to ABB, which incorporated them into their marine product range. After 2001 - STADT has been working with development of the 5. generation AC drives, the STADT STASCHO. This new no loss technology, based on sinus control, was patented in 2008, and launched to the first ship applications the same year.