Why are permanent magnet machines best for in-line shaft generators?

Talking point

Case study: Permanent magnet machine vs induction machine for in-line shaft generator system

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Permanent magnet machines

Permanent magnet machines have significantly better efficiency in slow-speed, direct-drive applications. That’s why they’re becoming the standard choice in large LNG and LPG carriers, which typically use an in-line shaft generator.

In this talking point, you will learn:

    • Why the use of permanent magnet machines is growing in popularity
    • The weaknesses of electrically excited synchronous generators (EESGs)
    • Drawbacks of induction machines 
    • Comparison of efficiencies at different speeds and load (torque) levels