新型磁通切换型双凸极永磁电机的静态特性研究

介绍了1种新型磁通切换型双凸极永磁电机,以1台三相12／10极样机为例分析其结构特点和运行原理,并基于有限元法,详细研究其静态特性。具体包括对空载和单相绕组通电的磁场和气隙磁密分布做了较为深入的分析,在此基础上研究绕组永磁磁链、反电动势、定位力矩、绕组电感以及静态转矩等,分析永磁磁场和电枢磁场之间的相互耦合作用对电感特性的影响。结果表明:该种电机的特点在于其双极性的每相永磁磁链显著增加了电机的转矩密度;由于其磁链和反电动势波形从本质上都是正弦分布,使得该种电机特别适合于无刷交流运行的应用场合。所得结果为该种电机的设计、性能分析以及运行控制等建立了基础。

Study on Static Characteristics of Novel Flux-Switching Doubly-salient PM Machine

A novel flux-switching permanent magnet (FSPM) machine with doubly-salient structure is introduced, and the special topology and operation principle are analyzed by using a 3-phase 12/10-pole FSPM machine as an example. Based on finite element analysis(FEA), the static characteristics are investigated, including the magnetic field and flux density distributions in the airgap at no-load and one-phase-on conditions. Hence, the open-circuit flux-linkage, back-EMF, cogging torque, winding inductance and static torque are deduced. The effect on the inductance of the cross-coupling between the permanent magnet field and armature field are taken into account. It shows that the phase open-circuit flux-linkage waveform is bipolar, hence it exhibits significantly higher torque density. Besides, both the phase flux-linkage and phase back-EMF are essentially sinusoidal, which makes it most appropriate for brushless AC operation. The results lay a foundation for the design, performance analysis, and operation control of the machine.