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STEALTH AC Propulsion Technology for All-Electric Naval Ships

STADT NAVAL 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.


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STADT NAVAL 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 NAVAL AS 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. It is available in models from 100kW up to 80MW, with low and medium voltages up to 15kV.

The system will reduce your fuel consumption to a minimum, and leads to a major reduction of pollution from NOx, SOx and CO2. It also performs silently without any electric disturbances.

In 1996, the first STADT electric propulsion order was delivered to the Norwegian coastguard K/V Tromsø , representing a technological breakthrough.
The STADT LEAN HYBRID solution for a naval ship.
STADT LEAN HYBRID – discover the power of simplicity.
STADT LEAN PROPULSION is a sophisticated and silent system with stealth performance.
The STADT LEAN Drive has many unique features compared to traditional electric propulsion systems.
STADT offers a broad range of AC motors.
A patented solution for start and control of big electrical motor loads.
STADT Motor for CPT.
STADT main switchboards for low and medium voltage are designed to meet MIL-STD-901 requirements.

Electric propulsion drive system 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.

STEALTH performance and space-efficient electric propulsion system

Major advantage of the new system is the space-saving fact since the big propulsion transformers are not needed. THD level of less than 2% is achieved.

Robust and sustainable technology

Another major advantage of the STADT Lean Drive technology is high-reliability and a long lifespan of 30 years and more.

This is accomplished in a patented way of using different parallel technologies, redundant to each other, and at the same time using fewer components in the drive system.

System integration

STADT NAVAL AS has extensive experience in system design and integration for different types of ship projects.

Our broad range of system components, in different types of technologies, enables us to design optimum solutions for each individual project.

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