Abstract
In this study, the back electromotive force (EMF) waveforms of a flux switching permanent magnet (FSPM) machine and variable flux memory permanent magnet (VFMPM) machine with same main dimension were researched. Firstly, the simulation result showed that the maximum amplitude of phase back EMF waveform of FSPM machine was 245% larger than that of the VFMPM machine, and this was verified by the experimental result (243%). Secondly, the phase back EMF harmonics of the FSPM machine and VFMPM machine were compared, including the enhance flux condition and weaken flux condition of VFMPM machine. At last, the mutual demagnetization effect, which led to the difference amplitudes of maximum back EMF waveform between FSPM machine and VFMPM machine was analyzed. The comparison and analysis of the back EMF waveform will provide some qualitative advice for the future application research of the FSPM machine and VFMPM machine, such as application selection, optimization control method and so on.
Highlights
For the flux switching permanent magnet (FSPM) machine, it has the characteristic of flux weakening, which can be used for hybrid electric vehicles (HEVs) or plug-in electric vehicles (PEVs)
Under the condition of same main dimension structure, this paper focuses on the similarities and differences between the FSPM machine and variable flux memory permanent magnet (VFMPM) machine, especially the back electromotive force (EMF)
The reason for the different amplitudes of the maximum back EMF waveform between the FSPM machine and VFMPM machine was analyzed, including the mutual demagnetization effect in VFMPM machine. These analyses and comparisons will provide some qualitative advice for future research on the FSPM machine and VFMPM machine, such as application selection, optimization control and so on
Summary
Under the condition of same main dimension structure, this paper focuses on the similarities and differences between the FSPM machine and VFMPM machine, especially the back EMF waveform and mutual demagnetization effect. The operational principles of the VFMPM machine, including the back EMF waveform analysis, permanent magnet’s magnetization and demagnetization, were analyzed. The reason for the different amplitudes of the maximum back EMF waveform between the FSPM machine and VFMPM machine was analyzed, including the mutual demagnetization effect in VFMPM machine. These analyses and comparisons will provide some qualitative advice for future research on the FSPM machine and VFMPM machine, such as application selection, optimization control and so on
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