The Switch PM machines for shaft generators and direct propulsion

The Switch permanent magnet machines can be operated as a generator or a motor. They are ideal for large low-speed, direct-drive two-stroke engines. The Switch propulsion motors offer high efficiency with a large speed range. 

Widest range of permanent magnet machines available

Optimized for 690 V. 
Other voltages available on request. 

Key to higher efficiency

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.

All The Switch PM machines are thoroughly tested at our own Large Drive Test Center and fulfill relevant international standards and class requirements.

Advantages of permanent magnet machines

Higher efficiency
No need for magnetization power
Rotor losses close to zero

Better reliability and less maintenance

No rotor windings, slip rings, exciters or automatic voltage regulators


Reduced space requirements
Higher air gap tangential stress results in more compact machine
Shorter and narrower, especially in low-speed applications

Enhanced shaft line dynamics
Much smaller rotating mass and inertia
Reduced torsional vibrations, lateral vibrations and rotor deflections

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