Abstract
Compared with the traditional flux switching permanent magnet machine, flux switching permanent magnet memory (FSPMM) machine has two kinds of permanent magnets, flux regulating windings and complex flux path. In this article, a three phase FSPMM machine with 12 stator slots and 14 rotor poles is optimized by numerical simulation software. After the pole-arc optimization, there is only one suitable skewed slot degree of rotor that can further increases the sinusoidal degree of back electromotive-force (EMF) of FSPMM machine, and decreases the amplitude of EMF slightly. Besides, the flux regulating of FSPMM machine includes enhance flux is analyzed by numerical simulation software. Lastly, a prototype of FSPMM machine is constructed, and the obtained numerical simulation results are verified by experimental tests. The simulation and experimental results may be benefit for the research of operational control, flux regulation and industry application of FSPMM machine in future.
Highlights
Flux switching permanent magnet memory (FSPMM) machine is a novel flux switching permanent magnet machine that has the function of flux regulating, including the enhance flux and weaken flux [1,2,3]
Different from the traditional flux switching permanent magnet (FSPM) machine [19], the FSPMM machine has the second kind of permanent magnet LNG52, which is installed in the outside of stator and surrounded by field regulating windings
In order to ensure the width of stator tooth and rotor tooth, we optimal the back EMF waveform of FSPMM machine by pole-arc coefficient preliminary, and increase the sinusoidal degree of back EMF waveform further by skewed slot of rotor
Summary
Flux switching permanent magnet memory (FSPMM) machine is a novel flux switching permanent magnet machine that has the function of flux regulating, including the enhance flux and weaken flux [1,2,3]. After the work point changing of low-coercive-force permanent magnet materials, the air-gap flux density of FSPMM machine can be weakened or enhanced, the amplitude of back electromotive-force (EMF) waveform, speed, torque density and cogging force can be changed. In this situation, the FSPMM machine is suitable for the domain of wide speed range and variable torque such as electric vehicle, aeronautics and astronautics, etc [6,7,8,9]. This paper investigates the back EMF waveforms performance of FSPMM machine by rotor structure improvement, includes the harmonics analysis, weaken flux and enhance flux. A three phase FSPMM machine with 12 stator slots and 14 rotor poles is constructed, and the numerical simulation and optimization results are verified by the experimental tests
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