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Abstract
To enhance the thrust force density and move a part of copper loss from the primary to the secondary of linear switched flux permanent magnet machines (LSFPMMs), this paper proposes a novel kind of doubly-fed LSFPMMs (DFLSFPMMs) by adding another set of armature winding on the secondary of LSFPMMs. The design and working principles of the new winding are analyzed first. It is found that the optimal coil pitch depends on the primary structure. Then, the parameters of DFLSFPMMs with U-core, C-core, E-core, and multi-tooth primary structures are globally optimized, and their electromagnetic performances are investigated by 2D finite element method. The result shows that the average thrust force of U-core DFLSFPMM is 30% higher than that of conventional LSFPMM counterpart, and it is also 23%-29% higher than those of DFLSFPMMs with other three primary structures. Besides, the U-core machine with tubular structure is analyzed for the potential application of electromagnetic shock absorbers, which shows the U-core DFLSFPMM has 10% higher peak-to-peak damping force than linear spoken-type PM machine. Finally, a prototype of U-core DFLSFPMM is manufactured and tested to validate the analysis.
Highlights
By employing high performance permanent magnets (PMs), PM machines have attracted more and more attention due to high power density and efficiency [1], [2]
It can be found that the total harmonic distortions (THDs) of the primary phase back-EMF in these machines are relatively small, while a large number of harmonic components exist in the secondary phase back-EMF of DFLSFPMMs
In this paper, four DFLSPMMs are proposed by adding secondary windings in the conventional linear switched flux permanent magnet machines (LSFPMMs)
Summary
By employing high performance permanent magnets (PMs), PM machines have attracted more and more attention due to high power density and efficiency [1], [2]. The combination of U-core stator and salient rotor is one of the most common structures for SFPMMs [10]. In [17] and [18], the investigations of LSFPMMs with U-core primary showed this kind of machines have higher thrust force density when the secondary pole number is close to the primary pole number. Since the PMs are surrounded by the iron core and armature winding, it is not easy to manage the PM temperature in LSFPMMs. A partitioned primary structure was proposed to solve these problems [22], [23]. Four flat doubly-fed LSFPMMs (DFLSFPMMs) are proposed by adding another set of armature winding on the secondary of the U-core, C-core, E-core, and multi-tooth LSFPMMs, respectively. A prototype machine is manufactured to validate the analysis results
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