关键词: 无铁心轴向磁通永磁电机, 气隙磁密, 解析法, 等效多层电流片

Abstract: Axial flux permanent magnet motor magnetic field is three-dimensional structure and complex magnetic circuit, the use of finite element method to solve the motor air gap magnetic field will consume a lot of modeling and simulation time. In view of the problem, the analytical method was used to calculate the no-load magnetic field of the motor, by dividing the motor into multiple sections along the radial direction, the three-dimensional axial flux motor was equivalent to a combination of multiple two-dimensional linear motors, and the Laplace equation was solved in the Cartesian
coordinate system, the vector magnetic potential was obtained, and the boundary conditions were substituted to solve the magnetic field. When calculating the armature reaction magnetic field, the multilayer current sheet method was used to solve it, which verified the feasibility of the analytical method compared with the finite element simulation results, and improved the speed of magnetic field calculation and motor parameter design of ironless axial flux permanent magnet motor.

Key words: ironless axial flux permanent magnet motor, air gap magnetic density, analytical method, equivalent multilayer current sheet