On Optimal Design And Iron Loss Of High-speed Permanent Magnet Motor With Amorphous Alloy Stator Core

High speed permanent magnet motor with Amorphous alloy has the advantages of high efficiency and machining accuracy, so that it is widely used in production, such as CNC engraving machine and high speed centrifuge. High speed permanent magnet motor operates under complicated multi-physical coupling conditions, which include the electromagnetic field, structural mechanics, material mechanics, friction heating, thermal stability, etc.. Based on the time stepping finite element method, we use two software ANSOFT Maxwell and ANSYS Workbench to analyze the electromagnetic characteristics and mechanical structural characteristics of 11KW high speed permanent magnet synchronous motor.Firstly,11KW high speed permanent magnet synchronous motor 2D model is established by Maxwell ANSOFT. The Halbach array is used in permanent magnet rotor.by comparing the harmonic content of the air gap flux density before and after optimization, the advantage of the Halbach array is verified.Secondly, in order to reduce the performance degradation caused by high harmonic content in air gap magnetic field, A novel surface mounted permanent magnet rotor with modular poles and Halbach array was proposed. Based on the time stepping finite element analysis and Taguchi method, the structure parameters of the rotor are optimized. The optimization parameters includes:permanent magnet thickness, modular pole ratio, Halbach magnetizing angle, coercivity of magnetic material. The advantage of the optimization method is verified by comparing the harmonic content of the air gap flux density before and after optimization.Thirdly, in order to check the mechanical stability of the high speed permanent magnet synchronous motor, we simulate the mechanical stress field of the motor at Workbench. The result shows that the sheath of the permanent magnet is strong enough to protect the rotor, by the increasing temperature of the rotor permanent magnetic material, the problem of decreasing EMF is discussed.Finally, the DW470 silicon steel and the amorphous alloy are selected as the stator core, FEM(finite element method) is used to compare the iron losses of two materials, The excellent properties of amorphous alloy material under high frequency condition are verified.The work of this paper has laid a good foundation for improving the performance of high speed permanent magnet motor.