Abstract
Torque performance, especially torque density, is a critical performance index for the flux-switching permanent magnet (FSPM) machine that is attractive for the propulsion system. In this article, a novel FSPM machine with dual sets of magnet arrangements is proposed. With the novel topology, the torque density of the proposed machine is significantly improved due to much increased working harmonic contents of magnetomotive force (MMF). Moreover, the cogging torque is also inherently reduced, which makes the proposed machine a promising candidate in the FSPM machine family. The operating principle of the proposed FSPM machine is revealed based on the MMF–permeance model and the numerical finite element analysis (FEA). The effect of geometric parameters, such as magnet thickness, auxiliary tooth width, and rotor tooth width on the average torque and cogging torque, is also investigated. Finally, a prototype has been manufactured to validate the analysis conclusion. With experimental test results, it is demonstrated that the proposed topology can achieve 30.8% higher torque density, 79.4% lower cogging torque, and 15.6% higher power factor than the conventional counterpart.
Highlights
IN recent decades, permanent magnet (PM) machines have been widely used in various industry applications, such as ship propulsion, aerospace equipment and electric vehicle
MACHINE TOPOLOGY AND OPERATING PRINCIPLE operating principle of the proposed flux-switching permanent magnet (FSPM) machine with dual sets of magnet arrangements is analyzed and some expressions are derived to investigate the contributions of the working harmonics
The magnet thickness, which is critical to the cost, has a significant influence on the performance of the proposed FSPM machines with dual sets of magnet arrangements
Summary
IN recent decades, permanent magnet (PM) machines have been widely used in various industry applications, such as ship propulsion, aerospace equipment and electric vehicle. With the extension of electric machine theory and development of high performance magnetic materials, FSPM machine has received much increased attention due to its simple rotor structure and fault-tolerance capability [2]-[8]. Chen et al [13] proposed a novel E-core FSPM machine which could exhibit 15% higher torque capability than conventional 12/10 stator/rotor pole machine. The C-core FSPM topology [14] was proposed and it was demonstrated that 40% higher torque density could be realized compared with the conventional 12/10 stator/rotor pole FSPM machine. The multi-tooth FSPM machines were investigated for the first time in [19] and the optimal slot/pole combinations were discussed to exhibit high torque capabilities in [20]. It is shown that the multi-tooth FSPM machine can exhibit higher torque density than conventional 12/10 stator/rotor pole machine.
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