Introduction
STADT AS, located in Gjerdsvika, Norway, specializes in integrated electric propulsion systems and patented AC drive technology. Founded by Hallvard L. Slettevoll in 1986, the company has a rich history of innovation in power inverters for maritime applications.

Company History
STADT was established after Slettevoll's experience with Philips, focusing on frequency converters. The company launched its first innovative inverter series in 1997, featuring a compact design with direct water cooling. This technology was initially adopted by the Norwegian coastguard and expanded to various maritime and industrial applications.

Technological Developments
In 2001, STADT sold its water-cooled IGBT-converter business to ABB. Post-2001, the company developed the STADT Stascho, a next-generation AC drive based on patented sinus control technology, launched in 2008.

STADT Stascho Technology
The STADT Stascho technology offers significant advantages over traditional PWM technology, including reduced electric disturbances and system losses. It provides sinusoidal voltage and current, minimizing harmonic disturbances and improving efficiency with only 6% electric system losses.

Environmental and Operational Benefits
The STADT Stascho system reduces diesel consumption by up to 45%, lowers emissions (NOx, SOx, CO2), and decreases maintenance needs. It is a compact, reliable system that eliminates the need for transformers and ensures high maneuverability when combined with CP propellers.

Product Range
STADT offers a range of products including AC drives, motors, soft starters, generators, and automation systems. The STADT Stascho can deliver up to 50 MW in voltages up to 15 kV, supporting AC motors up to 25 MW.

Conclusion
STADT AS continues to lead in AC drive technology, providing environmentally friendly and efficient propulsion systems for maritime and industrial applications.