Abstract
Magnetic couplings (MCs) enable contactless speed/torque transmission via interactions between the magnetic fields of permanent magnets (PMs) rather than a physical mechanical connection. The contactless transmission of mechanical power leads to improvements in terms of efficiency and reliability due to the absence of wear between moving parts. One of the most common MC topologies is the coaxial type, also known as the radial configuration. This paper presents an analytical tool for the accurate and fast analysis of coaxial magnetic couplings (CMCs) using a two-dimensional subdomain approach. In particular, the proposed analytical tool resolves Laplace’s and Poisson’s equations for both air-gap and PM regions. The tool can be used to evaluate the impact of several design parameters on the performance of the CMC, enabling quick and accurate sensitivity analyses, which in turn guide the choice of design parameters. After discussing the building procedure of the analytical tool, its applicability and suitability for sensitivity analyses are assessed and proven with the analysis of a fully parameterized CMC geometry. The accuracy and the computational burden of the proposed analytical tool are compared against those of the finite element method (FEM), revealing faster solving times and acceptable levels of precision.
Highlights
Magnetic couplings (MCs) are used in applications where contactless torque/speed transmission is achieved by exploiting the magnetic interaction between both sides of the coupling
The performance of the coaxial magnetic couplings (CMCs) equipped with NdFeB rare earth permanent magnets (PMs) has been assessed in [28]. For both axial and coaxial MCs [29], the research works available in literature mainly focus on the performance impact of a single size parameter, more effective design choices could be made by taking into account several design parameters, such as the number of pole pairs, PM thickness, air-gap thickness, etc
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Summary
MCs are used in applications where contactless torque/speed transmission is achieved by exploiting the magnetic interaction between both sides of the coupling. The performance of the CMC equipped with NdFeB rare earth PMs has been assessed in [28] For both axial and coaxial MCs [29], the research works available in literature mainly focus on the performance impact of a single size parameter, more effective design choices could be made by taking into account several design parameters, such as the number of pole pairs, PM thickness, air-gap thickness, etc. To achieve a more comprehensive preliminary design capability, it would be essential to rely on a fast and accurate analysis tool In response to such a need, the paper introduces a 2D analytical tool capable of computing both the air-gap field distribution and the transmitted torque in order to assess the CMC performance. These two strengths prove the feasibility and effectiveness of the preliminary design tool
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