High-performance propulsion motors for more electric aircraft (MEA) are highly appreciated in transportation electrification. For the widely adopted permanent magnet synchronous machines (PMSMs) for MEA propulsion, the segmented Halbach magnetization has distinct merit that it contributes to sinusoidal air-gap magnetic fields for smooth operation. However, it is hard to fast predict the field distribution and machine performance due to the model complexity. Based on the subdomain method, this article first proposes an exact analytical model for slotless PMSM with the segmented Halbach PMs. Then, the model is applied in the fast computation of the magnetic field and performance prediction. Subsequently, the analytical results are compared with the finite element method (FEM), including the flux density, flux linkage, induced voltage, and steady-state torque at different loads. Also, the computation burden and prediction error are included to validate the model’s rapidity and accuracy. Finally, by prototype fabrication and unique field measurement methods, the flux density distribution is originally validated.

中文翻译：

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用于更多电动飞机的无槽分段-Halbach 永磁同步电机的现场预测和验证

用于多电动飞机 (MEA) 的高性能推进电机在运输电气化领域受到高度赞赏。对于广泛采用的用于 MEA 推进的永磁同步电机 (PMSM)，分段 Halbach 磁化具有明显的优点，它有助于正弦气隙磁场的平稳运行。然而，由于模型的复杂性，很难快速预测场分布和机器性能。本文基于子域方法，首先提出了一种具有分段Halbach PM的无槽PMSM的精确解析模型。然后，将该模型应用于磁场的快速计算和性能预测。随后，将分析结果与有限元法 (FEM) 进行比较，包括磁通密度、磁链、感应电压、和不同负载下的稳态扭矩。此外，还包括计算负担和预测误差以验证模型的快速性和准确性。最后，通过原型制造和独特的现场测量方法，最初验证了磁通密度分布。