Permanent magnet machines for marine applications

The Switch permanent magnet machines are designed for maximum flexibility, operating seamlessly as both generators and propulsion motors. Engineered specifically for diverse vessel types, they enable efficient and reliable power transmission while minimizing mechanical complexity.

All permanent magnet machines are extensively tested at our Large Drive Test Center, ensuring proven performance under real operating conditions. Fully compliant with international standards and marine classification requirements, they offer shipowners and shipyards a trusted, future-ready solution for advanced marine propulsion and power generation.

Save 5,000 tons of CO²
Our average permanent magnet marine shaft generator can save up to 5,000 tons of CO2 over a vessel’s lifetime – or 250 tons annually. This covers the annual CO2 footprint of 37 persons in the EU. So far, over 350 machines have been sold, covering the carbon footprint of about 13,000 people.

Brochure: The Switch permanent magnet machines for marine

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Widest range of permanent magnet machines available

PMM2000M

Product
Optimized for large container ships, The Switch PMM2000M ensures smooth, low-speed operation, high efficiency, and maximum uptime across long ocean routes.
  • Torque: 580–1500 kNm
  • Rotating speed: 0–130 rpm
  • Application: Typically used in 4–12 MW direct-drive systems
PMM2000M 580–1500 kNm, 0–130 rpm Typically used in 4–12 MW direct-drive systems

PMM1500M

Product
The PMM1500M delivers powerful, reliable performance where it matters most, making it an ideal choice for bulkers, gas carriers, and tankers operating under heavy loads and long duty cycles.
  • Torque: 220–630 kNm
  • Rotating speed: 0–220 rpm
  • Application: Typically used in 2–4 MW direct-drive systems

PMM1200M

Product
The PMM1200M is a more compact direct-drive machine, delivering high torque performance for vessels where space and efficiency are critical.
  • Torque: 200–450 kNm
  • Rotating speed: 0–250 rpm
  • Application: Typically used in 1–3 MW direct-drive systems

PMM1000M

Product
The PMM1000M is a versatile machine engineered for a wide range of vessels, including bulkers, PCCs, tankers, special purpose vessels, and gas carriers making it the ideal choice for diverse fleet requirements.
  • Torque: 73–230 kNm
  • Rotating speed: 0–250 rpm
  • Application: Typically used in 1–2 MW direct-drive systems
PMM1000M

PMM850M

Product
The PMM850M permanent magnet machine is recognized for its compact design and high-efficiency performance making it an ideal choice for space-constrained vessels such as regional tankers, feeders, and smaller cargo ships.
  • Torque: 70–230 kNm
  • Rotating speed: 0–400 rpm
  • Application: Typically used in 0.5–2 MW shaft generator and propulsion motor applications

Advantages of permanent magnet machines

Permanent magnet (PM) technology is key to higher efficiency in shaft generator and direct propulsion applications.

A strong magnetic field is needed to link the stator and rotor for electromechanical power conversion. Traditionally, this field was supplied by electric current through a separate winding.

With modern Neodymium magnets, the magnetic field can be created more simply and efficiently, resulting in a technically advanced machine. That’s why their use in PM machines have made them the top choice for wind power – and now also for marine.

Higher efficiencyNo need for magnetization power

Rotor losses close to zero
Better reliability and less maintenanceNo rotor windings, slip rings, exciters or automatic voltage regulators
Reduced space requirementsHigher air gap tangential stress results in more compact machine

Shorter and narrower, especially in low-speed applications
Enhanced shaft line dynamicsMuch smaller rotating mass and inertia

Reduced torsional vibrations, lateral vibrations and rotor deflections