STADT LEAN Drive is the company’s patented solution for start and control of big electrical motor loads in the shipping industry.

Specially developed for marine propulsion systems where it can be used on any propeller with controllable pitch.


Our technology is extremely scalable, available in any voltage, configuration and for all vessel types without the use of transformers.

It features:

  • 220V – 15kV
  • 100kW – 30MW per motor
  • Stealth execution for naval


The STADT LEAN Drive has many unique features compared to traditional electric propulsion systems. These include:

  • No LOSS when in bypass
  • No THD when in bypass
  • No EMI when in bypass
  • No PWM when in bypass
  • Sinus voltage and current
  • Less complexity
  • Less weight and space
  • Increased lifetime of drive
  • Increased redundancy in drive
  • Air cooled drive
  • Scalable in power
  • Scalable in voltage

These unique features are achieved by using a combination of a multi-speed motor, transistors (VFD), thyristors (RVS) and circuit breakers (BP) together with a controllable pitch propeller (CPP), where we use the different technologies in sequence and where they are best.

With the STADT LEAN Drive we achieve a robust and reliable drive system where the dependence of critical components is reduced to a minimum, while the redundancy is increased. It is designed featuring:

  • Main propulsion
  • Tunnel thrusters
  • Retractable thrusters
  • Compressors
  • Pumps