The Switch permanent magnet machines can be operated as a vessel generator or motor, and are ideal for large low-speed, direct-drive two-stroke engines.
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Permanent magnet generator
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Endurance Marine Stainless Steel 12 Volt DC Powered Drum Winch — 600 Watt Electric Motor, 1200-Lb. Pulling Capacity, Model# EDM600-011SS
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HUIZHITENGDA Low RPM 600R/Min 10000W 110V/220V Small Permanent Magnet Generator Ac Alternator for DIY Your Own Horizontal Wind Turbine,12v : Patio, Lawn & Garden
Why permanent magnets trump the norm for in-line shaft generators