Design of a Halbach Magnet Array via Topology Optimization for Reducing Thrust Ripple in PMSLMs

This paper addresses the need for thrust ripple suppression in high-precision permanent magnet synchronous linear motors by proposing a Halbach permanent magnet array design method based on topology optimization. By optimizing the material distribution of the permanent magnets, the sinusoidality of the air-gap magnetic field is enhanced, thereby effectively suppressing thrust ripple. Taking a single-sided coreless linear motor as the research object, a two-dimensional finite element model is established and a topology optimization design is performed. The results show that this method can significantly increase the fundamental wave proportion of the air-gap magnetic field and reduce higher-order harmonics, providing a new approach for improving the motion accuracy of linear motors.