Abstract
Permanent magnet couplings (PMCs) are widely used in underwater propulsion because it can solve the deep-sea sealing problem effectively. In this paper, a new type of conical permanent magnet coupling (CPMC) is proposed, which is able to match the tail shape of the underwater vehicle and make full use of the tail space to increase pull-out torque capability. Based on the three-dimensional finite element method (3D-FEM), the electromagnetic characteristics of an initial model for CPMC are analyzed. In order to facilitate the design and optimization of CPMC, an equivalent three-dimensional (3D) analytical method for the pull-out torque calculation is presented, and its accuracy is verified by comparison with the 3D finite element results. Finally, the influence of design parameters such as half-cone angle, pole pair, pole arc coefficient and permanent magnet thickness on maximum pull-out torque and torque density of CPMC is analyzed, and a preliminary optimization model is obtained.
Highlights
The deep sea is a huge treasure that still remains to be explored
The analytical method can be used to analyze the interaction between the pole pairs, pole arc coefficient and permanent magnet thickness, which is the basis for the optimal design of conical permanent magnet coupling (CPMC)
The pull-out torque of the preliminary optimized model is improved by 17.545% and the torque density increased from 5.101 × 105 N · m−2 to 5.997 × 105 N · m−2 when compared with that of the initially designed CPMC
Summary
The deep sea is a huge treasure that still remains to be explored. With the rapid development of marine technology, the interest in deep sea exploration is increasing both in the scientific and business community [1]. Paper [15] proposes a three-dimensional analytical method for calculating the pull-out torque of radial PMC. In paper [18], the authors developed a 3D analytical method for calculating the pull-out torque of radial PMC based on the expression of one pair magnet. An equivalent three-dimensional analytical method is proposed, and the effects of design parameters such as half-cone angle, pole pair, pole arc coefficient and permanent magnet thickness on the maximum pull-out torque and pull-out torque density of CPMC are analyzed, which lays the foundation for the design and optimization of CPMC
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