Abstract
The aim of this paper is to design, analyze and optimize the “Multi-Stack Slotless Axial Flux Switching Permanent Magnet Machine”. In the design process, mathematical models are implemented, and the Finite Element Method (FEM) is performed to analyze the machine performances. The paper aims to minimize the occurrence of cogging torque and torque ripple in the multi-stack slotless stator AFPM machine. As a consequence, it reduces the vibrations in the machine and increases its life span. Multi-stack slotless stator AFPM machine with a right-angled trapezoid-shaped PM is proposed and comparison is done with conventional shape AFPM machine. In order to examine the performance of multi-stack slotless stator AFPM machine Finite Element Analysis (FEA) is used. To further enhance the characteristics of the designed machine with the proposed right-angled PM shape, optimization is done by considering inner and outer pole pitch as the design variables. In optimization process, krigging method assigned with Latin Hyper-cube Sampling and a genetic algorithm (GA) is performed due to suitability with non-linear data. Then, finite element analysis by JMAG-Designer is performed to verify the results. It is determined that optimized model has achieved 65% reduction in torque ripples as compared with the conventional design. Hence, this work attempts to optimize the performance of the AFPM machine.
Highlights
Permanent magnet machines have a wide range of use in the electric vehicle and aerospace industries all around the world providing the exceptional performances such as high reliability, high-power density, and high efficiency [1]–[4]
Axial flux permanent magnet (AFPM) machines are installed for various applications because of their benefits [5]–[9]
Torque ripple is produced in multi-stack slotless stator AFPM machine due to cogging torque, magnetic circuit saturation, and non-sinusoidal back EMF
Summary
Permanent magnet machines have a wide range of use in the electric vehicle and aerospace industries all around the world providing the exceptional performances such as high reliability, high-power density, and high efficiency [1]–[4]. Torque ripple must be reduced for the smooth operation of the multi-stack slotless stator AFPM machine. Torque ripple is produced in multi-stack slotless stator AFPM machine due to cogging torque, magnetic circuit saturation, and non-sinusoidal back EMF. AFPM machines designed for ultrahigh-speed applications required the reduced torque ripples and losses to ensure the high performance and smooth operation. A decrease in torque ripple and cogging torque, eddy current losses in the teeth of the stator, and enhanced performance and efficiency of the AFPM machines is estimated with a suitable magnet shape [28], [29]. Performance of multi-stack slotless stator AFPM machine is carried out by using proposed right-angled trapezoid-shaped magnet and comparison is done with conventional magnet shape. This section discussed the conventional design process, propose magnet shape and electromagnetic performance comparison in detail.
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