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An alternating rotatory generator using an eddy current break is developed as a physical
scale model of a direct-driven floating point absorber power take-off (PTO) for wave
tank tests. It is shown that this design is a simple and cost-effective way to get
an accurate linear damping PTO. The device shows some beneficial characteristics,
making it an interesting option for full scale devices: For similar weights the inertia
can be significantly higher than for linear generators, allowing it to operate with
natural frequencies close to typical wave frequencies. The influence of the higher
inertia on the power absorption is tested using both a numerical simulation and physical
wave tank tests. With the increased inertia the PTO is able to absorb more than double
the energy of a comparable direct-driven linear generator in some sea states. Moreover,
the alternating rotatory generator allows the absorption characteristic to be tuned
by changing the inertia and the generator damping.