## 1 Introduction  
With the exhaustion of primary energy, there is a serious environmental pollution and energy shortage in the world. Wave power is one of the richest and promising sources of renewable energy for the future, so it is of great significance to study wave power generation to solve the problem of energy shortage. In the past four decades, hundreds of Wave Energy Converters (WEC) have been proposed and studied, but so far a conclusive architecture to harvest wave power has not been identified. At present, according to the wave energy-mechanical energy conversion method, the conventional wave energy power generation technology can be divided into three categories: oscillating water column type power generation [1], contraction channel type power generation [2], and hydraulic wave power generation technology [3; 4; 5]. In the early wave power generation system, rotating generators were used as energy converters. The reciprocating wave energy was converted into mechanical energy and then converted into electrical energy because of the need for intermediate conversion devices, such as cylinders, gears, etc. Its structure was complex and difficult to maintain. The efficiency is relatively low [6]. The direct drive wave power generation system consisting of a linear generator eliminates the intermediate conversion device and it has the advantages of simple structure and easy maintenance. In recent years, direct-drive generators have been paid more and more attention by researchers all over the world, there are many types of linear generator including transverse flux linear generator [7], linear synchronous generator [8], permanent magnet linear generator [9] and linear switched reluctance generator [10], etc., especially linear permanent magnet generators have been systematically studied [7]. Linear permanent magnet generators have stable power generation and high output efficiency. However, the price of permanent magnets is high and it is difficult to adapt to the harsh working environment [11; 12], which hinders its universal application to some extent. The stator structure of linear switched reluctance generator is simple and strong, and each phase can be controlled independently [13]. It has the advantages of no wear, no lubrication, low speed operation, and so on [14].When compared with the linear permanent magnet generator, the stator of the linear switched reluctance generator is composed of silicon steel laminated, it does not need to install permanent magnet, it is less affected by the external environment, and it can operate under the bad environment, such as high temperature, high corrosion, and other adverse environments, which is more suitable for ocean wave power generation. In the reference [15; 16], the single-sided linear switched reluctance generator system is studied; the mutual inductance coupling linear switched reluctance generator has been studied in the reference [11] to improve the efficiency of power generation; Double-sided Linear Switched Reluctance Generator (DLSRG)is studied in the reference [17], which is used to improve the unilateral magnetic tension problem; in the reference [12]; and the optimal efficiency tracking control of generator is studied in detail, and the two-sided mutual inductance coupled switched reluctance generator is chosen as the object of study, which improves the influence of two-sided magnetic pull force. The purpose of this paper is to design a DLSRG based on improving the single-sided magnetic tension of the traditional single-sided linear switched reluctance generator and reducing the coupling characteristics of the phase winding, the structure of the motor is optimized, the electromagnetic characteristics and generation performance are studied.