This article presents a new field-modulation double-stator electrical-excitation synchronous machine (FM-DSEESM) and analyzes its harmonic components of double-layer air gap magnetic field. The key is that both the types and sources of various harmonic-components of air gap magnetic field are derived by taking into account the permeance components of both inner and outer stator teeth and modulation-ring rotor. The selection criteria of main working harmonic components of excitation field is clarified to achieve the armature-winding configuration. Then, the working harmonic components of air gap magnetic field, which have the same pole pairs, rotating direction, and rotating speed, respectively, can be figured out by comparing the mathematical derivation and finite-element analysis results from the excitation field and armature reaction magnetic field. By analyzing the contributions of the air gap flux density components to the electromagnetic torque, it is found that the electromagnetic torque of the proposed FM-DSEESM mainly consists of two parts, namely the reluctance torque components generated by the stationary working harmonic components and the armature reaction torque components provided by the rotating working harmonic components. A low-speed direct-drive FM-DSEESM prototype is fabricated to verify the validity of the proposed analysis approach.

中文翻译：

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磁通调制双定子电励磁同步电机气隙磁场的谐波分析

本文介绍了一种新型场调制双定子电励磁同步电机（FM-DSEESM），并分析了其双层气隙磁场的谐波分量。关键是气隙磁场的各种谐波分量的类型和来源都是通过考虑内外定子齿和调制环转子的磁导分量推导出来的。明确了励磁场主要工作谐波分量的选择标准，实现了电枢绕组配置。然后，气隙磁场的工作谐波分量分别具有相同的极对、旋转方向和旋转速度，可以通过比较励磁场和电枢反应磁场的数学推导和有限元分析结果来计算。通过分析气隙磁通密度分量对电磁转矩的贡献，发现所提出的 FM-DSEESM 的电磁转矩主要由两部分组成，即静止工作谐波分量和电枢产生的磁阻转矩分量。由旋转工作谐波分量提供的反扭矩分量。制造低速直接驱动 FM-DSEESM 原型以验证所提出的分析方法的有效性。发现所提出的FM-DSEESM的电磁转矩主要由两部分组成，即由静止工作谐波分量产生的磁阻转矩分量和由旋转工作谐波分量提供的电枢反作用转矩分量。制造低速直接驱动 FM-DSEESM 原型以验证所提出的分析方法的有效性。发现所提出的FM-DSEESM的电磁转矩主要由两部分组成，即由静止工作谐波分量产生的磁阻转矩分量和由旋转工作谐波分量提供的电枢反作用转矩分量。制造低速直接驱动 FM-DSEESM 原型以验证所提出的分析方法的有效性。