Abstract
Linear magnetic field modulation gear can effectively avoid vibration and noise and lubrication and maintenance problems in mechanical gear, Which can replace mechanical gear in linear motion. According to the working mechanism of traditional magnetic field modulation gear, a linear magnetic gear is designed, whose transmission ratio is 2.67. Its air-gap flux density and static thrust characteristics and dynamic thrust characteristics are calculated by using the finite element analysis method. The calculate results validate the correctness of the design. Based on the above, the influence of ferromagnetic ring's size and the air-gap width to the gear's static thrust is analyzed, and then we have found rules about the influence, which can provide basis in optimizing a linear magnetic gear design. At the last, optimize the relative width of ferromagnetic ring to 0.6 and the thickness to 3 mm, the air-gap width of high-speed side to 1.2 mm and low-speed side to 1 mm.
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