![]() ![]() Even though linear motion can be realized by using rotational machines and linear to rotary motion converters, some unfavorable concerns are inevitably arisen, including higher costs, lower accuracy of position sensing, higher inertia, higher maintenance, and shorter lifetime of the system. Rotational electrical machines equipped with linear to rotary motion converters had been employed for linear applications before the introduction of linear structures. Finally, some significant structures of linear PM vernier generators are modeled using two-dimensional finite element analysis (2D-FEA) to compare their electromagnetic characteristics and survey their performance. They are categorized and evaluated to provide a comprehensive insight into the exploitation of linear vernier generators in wave energy extracting systems. Furthermore, recent advancements and innovative improvements have been investigated. In this work, a comparative study of different structures, distinguishable concepts, and operation principles of linear PM vernier machines is presented. Various structures and methods have been introduced to enhance their performance and improve their low power factor. Nevertheless, they inherently suffer from a poor power factor arising from their considerable leakage flux. The outstanding feature of providing high power capability makes linear vernier generators more advantageous compared to linear PM synchronous counterparts used in wave energy conversion systems. Linear PM vernier machines perform based on the magnetic gearing effect, allowing them to offer high power/force density at low speeds. Linear permanent magnet vernier generators (LPMVGs) have been widely adopted in wave energy applications to extract clean energy from oceans. ![]() Harvesting energy from waves as a substantial resource of renewable energy has attracted much attention in recent years. ![]()
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