A new technology for speed and power control of larger machinery operated via AC motor-drives has been launched to the shipping market. The patented STADT Stascho Sinus drive technology was first delivered to the seismic research vessel ” Sanco Star ” of Norway, operated by RXT. In this case the drives
were used for the full-electric main propulsion for the ship, driving 2 propellers each 2500 kW.
The first 3 months of operation offshore Brazil, have clearly demonstrated the qualities of the new system.

STADT is now busy with new projects. The next will be for the first full-electric Purse Seiner ever built in Norway, followed by a new sister ship of “Sanco Star “ .


The technology used in STADT Stascho is based upon IGBT transistors and thyristors. The system is also working as an integrated part of the CP propulsion system, where speed and pitch is controlled in an optimal way.

The STADT system is totally integrated with the ships propulsion plant as well as the power generation system and its PMS. It has its own configurable power controller, touch screen and interface to other systems on the ship.

The system is normally air cooled due to its very low losses. This makes it easy to locate the drives even in the control room of the ship.