Abstract: In order to improve the magnetic flux leakage caused by the traditional Halbach magnetizing structure in the non-air gap side of the linear generator, which leads to the reduction of the main flux content, power density and load capacity, the traditional Halbach magnetizing structure and the magnetic field distribution of the linear generator is improved. Firstly, the structural dimensions of traditional rectangular permanent magnets are optimized, and the variants of trapezoidal, T-shaped and U-shaped Halbach magnetizing structures are proposed. Then, the fundamental wave content of magnetic flux density under different sizes is analyzed, so as to find the optimal design size of each variant under the condition of maximum magnetic flux density content. Through the simulation results, it is found that the U-shaped Halbach magnetizing structure is more obvious than other structures in improving the magnetic flux leakage of the non-air gap side, and the output power and efficiency are improved.

Key words: linear generator, halbach magnetization, permanent magnet array, single side magnetization capability