STADT STEALTH AC Propulsion Technology for All-Electric Naval Ships

STADT AS is a leading company in AC drives and integrated electric propulsion systems for ships. Our latest product is the STADT Lean Drive innovative electric propulsion system.

STADT celebrated its 30th anniversary as a maritime technology company in December 2015, and moved in to its modern Maritime Center in Gjerdsvika, western Norway. By the end of 2015, approximately 31 ships in different categories had been using the STADT Lean Drive technology.

Marine drives for electric propulsion systems

Based on 30 years of experience, the STADT Lean Drive electric propulsion system is our fifth generation of innovative electric propulsion systems for ships. The solution is available in 100kW up to 80MW models, with low and medium voltages up to 15kV.

The system reduces fuel consumption to a minimum and leads to a major reduction in pollution caused by NOx, SOx and CO2. It also performs silently without any electric disturbances.

Electric propulsion drive systems for marine applications

The STADT Lean Drive electric propulsion system is based on four years of research and development. Company director Hallvard Slettevoll describes the new system as a ‘breakthrough in technology’ because it manages to combine the unique features of pure sinusoidal electric power, both for the main switchboard, along with the electric motors and other electric consumers, at minimum cost and space occupation.

Sinusoidal waveform on voltage and current ensures that there will be absolutely no interferences from inverter drives to other sensitive electronic equipment on the ships such as radars, echo sounders, and seismic research instrumentation. It also guarantees no bearing damages and an absolute minimum of acoustic noise from electric motors and drives. This is in contrast to the approach from other well-known electric drives suppliers, which have delivered systems with a very high degree of electric pollution / noise in their main switchboard grids, as well as EMI (EMC) to the surroundings.

The idea to create unique solutions based on sinusoidal pure electric power is an approach that STADT has developed in close co-operation with Swedish company NFO Drives. The sinus technology is patented by NFO and STADT.

STEALTH performance, space-efficient, noise-free and sustainable electric propulsion systems

Another major advantage of this new system is its space-saving capabilities since the big propulsion transformers are not needed and a THD level of less than 2% is achieved.

Another major advantage of the STADT Lean Drive technology is high-reliability and a long lifespan of 30 years or more. This is accomplished in a patented way of using several parallel technologies, redundant to each other, and at the same time using far fewer components in the drive system.

System integration STADT has extensive experience in system design and integration for different kinds of ship projects. Our broad range of system components used in different types of technologies enables us to design optimum solutions for each individual project.



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Press Release

STADT to Design New-Generation Naval Ships for Nato-Allied Country

STADT has signed a contract with a Nato-allied country to engineer new-generation naval ships using the Stealth AC drive electric propulsion technology.

White Papers

The Guidelines to Electric Propulsion in the Naval Industry

Ship owners need reliable vessels that are efficient to operate, year after year, in all seasons and weather conditions.


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+47 7002 5800 STADT Lean Propulsion Video

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Press Release

20 March 2019

STADT has signed a contract with a Nato-allied country to engineer new-generation naval ships using the Stealth AC drive electric propulsion technology.

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11 December 2015

After some years of preparation, STADT has moved into its new centre in Gjerdsvika, Norway, and simultaneously celebrated its 30th anniversary as a technology company.

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20 April 2015

Kongsberg Maritime AS has granted STADT AS the contract to provide their awarded No-Loss AC drive system for a 84-metre Superyacht that will be built by ECHO YACHTs in Australia.

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12 November 2012

The Norwegian drive specialist STADT has introduced the STEALTH AC electric propulsion technology for naval ships in any category.

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Regional Offices


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Mr Hallvard Slettevoll (sales contact) +47 7002 5800 STADT Lean Propulsion Video

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