Flux-weakening control is usually used for permanent magnet synchronous machines (PMSMs) to operate above the rated speed, which will cause a high d-axis current and torque decline. So, a novel flux-torque regulation hybrid excitation machine (FTRHEM) with an axial radial magnetic circuit is presented in this paper, which can provide additional torque by the axial alternating magnetic motive force (MMF) and solve the disadvantage of reducing the torque at the flux-weakening. To better clarify the principle of the machine, the air-gap magnetic flux and torque equations are deduced by combining the machine operating states and the equivalent magnetic network model. The circuit coupling relationship between the axial and radial multiple magnetics is analyzed to figure out the key factors affecting the flux and additional torque. Then, the influence mechanism of excitation current (EC) on magnetic flux and torque performance is clarified. The maximum flux regulation range and output torque of this machine are analyzed separately. The maximum flux regulation is 19.1%, and the torque increases by 48.1% more than that without excitation. Finally, the mechanism for matching excitation current with different torque and flux is determined. Experiments have been carried out to validate the analysis above.

中文翻译：

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新型轴向-径向磁路磁通-转矩调节混合励磁机联合调节性能研究


弱磁控制通常用于永磁同步电机（PMSM）在额定速度以上运行，这将导致较高的 d 轴电流和扭矩下降。因此，本文提出了一种新型轴向径向磁路磁通-扭矩调节混合励磁机（FTRHEM），它可以通过轴向交变磁动势（MMF）提供附加扭矩，解决了励磁系统中扭矩减小的缺点。通量弱化。为了更好地阐明电机原理，结合电机工作状态和等效磁网络模型，推导了气隙磁通和扭矩方程。分析轴向和径向多个磁体之间的电路耦合关系，找出影响磁通和附加扭矩的关键因素。然后，阐明了励磁电流（EC）对磁通量和扭矩性能的影响机制。分别分析了该机的最大磁通调节范围和输出转矩。最大磁通调节率为19.1%，转矩比无励磁增加48.1%。最后，确定了励磁电流与不同转矩和磁通的匹配机制。进行了实验来验证上述分析。