Since the world faces to the realization of “the low-carbon world”, renewable energies have been attracting attention. Due to the estimated ocean-wave power capacity is large, wave power generations are one of the promising renewable energy. However, the system using the rotational motor and the conventional linear motor has problems caused by the mechanical loss and the output power amount. On the other hand, the authors have proposed “a helical motor” as a high thrust-density linear motor and the damping control using this motor. In the latest study, deriving the optimal damping gain, the regenerative efficiency maximization control for the motor was proposed and basically validated. In this paper, firstly, in comparison with the experiment, the numerical simulation, and the derived theoretical response, the calculations were validated. Then, from the numerical and theoretical analysis, the proposed control and design method were discussed. From this discussion, it can conclude the proposed design method can predict the existence range of the optimal damper gain.
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