Electromagnetic force analysis of permanent magnet synchronous motors based on rotor magnetic barrier structure optimization

This passage elucidates a research endeavor focused on addressing electromagnetic vibration challenges within permanent magnet synchronous motors. The narrative commences with an analytical derivation of the radial electromagnetic force expression in permanent magnet synchronous motors, employing the Maxwell tensor method. A comprehensive summary detailing the orders and frequencies of the electromagnetic force is presented. Subsequently, a spatiotemporal order table is introduced, encapsulating the principal electromagnetic forces in an 8-pole 48-slot motor. The research methodology involves a meticulous simulation analysis on an internally configured permanent magnet synchronous motor featuring an 8-pole 48-slot design. Various magnetic barrier structures are systematically modeled utilizing finite element analysis. The ensuing investigation explores the influence of diverse magnetic barrier structures on the amplitudes of radial electromagnetic forces, specifically focusing on (0th, 6f₀) and (0th, 12f₀) frequencies. In comparison to the prototype motor, the enhanced motor demonstrates significant improvements in performance. Specifically, at the rated speed of 3000 rpm, there is a 7.96% reduction in the 10f₀ noise and a 16.293% reduction in the 12f₀ noise. At a speed of 6000 rpm, the 6f₀ noise decreases by 2.243%, and the 14f₀ noise decreases by 17.661%. Furthermore, the torque pulsation coefficient experiences a substantial reduction of 33.76%.