Abstract
The traditional bearingless synchronous reluctance motor (BSynRM) with salient pole rotor has some drawbacks such as high suspension force ripple, low torque density and low power factor. To overcome the above shortcomings, the permanent-magnet-assisted bearingless synchronous reluctance motor (PMa-BSynRM) is proposed. In this paper, two types of PMa-BSynRM rotors with the same number of permanent magnets but different magnetic barrier structures are designed. A traditional BSynRM with a salient pole rotor is introduced, and the electromagnetic and vibration characteristics of the three BSynRM are analyzed and compared. Firstly, the rotor structures of the two PMa-BSynRMs are designed, and the operation principle of the BSynRM is introduced. Secondly, electromagnetic characteristics of the three motors are analyzed and compared in detail using FEA software. Thirdly, the vibration analysis of the three motors is carried out. Finally, the experimental prototype platforms are built. The FEA and experimental results verify that the designed PMa-BSynRM can improve the power factor and torque density of traditional BSynRMs, and the most superior BSynRM among the three is identified.
Highlights
Flux barrier rotors are applied in both PMa-bearingless synchronous reluctance motor (BSynRM), and the permanent magnets are installed
The models of the PMa-BSynRM I, PMa-BSynRM II and the BSynRM were constructed in the finite element analysis (FEA) software, and their electromagnetic properties were researched and compared
The no-load air gap magnetic density and no-load back-EMF the of the two PMa-BSynRMs are shown in Figures 9 and 10, respectively
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. According to [10,11,12], the power factor and torque density of the BSynRM with the flux barriers rotor were improved, compared with the salient rotor, they were still lower than that of the rare earth permanent magnet motor. There are many published studies on PM-assisted SynRM; in particular, many methods have been proposed to solve the problem of large torque ripple. In [18], the optimal design for the stator pole/slot combination, winding method, and stator parameter design are proposed to improve the efficiency and reduce the torque ripple of the PMa-SynRM. In [20], a permanent-magnet-assisted single winding bearingless synchronous reluctance motor with a T-shaped winding structure is proposed.
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