Abstract
Permanent-magnet couplers are widely used in various industrial applications due to their high functionality and economy. The magnetic field of the magnetic circuit of a permanent-magnet coupler is divided by the segmentation method, by which the magnetoresistance of each area can be calculated. The magnetic resistance of the magnetic flux and the permanent-magnet coupler characteristics outside the magnetic circuit are obtained using the equivalent magnetic circuit model of permanent-magnet couplers. The working point of the permanent magnet is analyzed, and the skin effect is found to be equivalent to a conductor plate with an increase in its resistivity. According to the principle of electromagnetic induction, the ampere force received by each part is calculated. Finally, the theoretical calculation model of the transmitted torque of the permanent-magnet coupler is obtained, and its accuracy is verified by finite element simulation and experiments. This can significantly guide the design and engineering applications of permanent-magnet couplers.
Highlights
While operating permanent-magnet couplers, the non-contact relative motion between permanent magnets and conductors results in the formation of the induced eddy current and magnetic field, and its interaction with the magnetic field leads to torque transfer
The conductor plate of a permanent-magnet coupler exists in an alternating magnetic field, and the skin-warming effect leads to the concentration of induced eddy currents on the side near the permanent magnet plate
In this study, based on the fundamental law of magnetic circuits, the magnetic circuit of permanent-magnet couplers is divided into several flux tubes using the magnetic field segmentation method
Summary
While operating permanent-magnet couplers, the non-contact relative motion between permanent magnets and conductors results in the formation of the induced eddy current and magnetic field, and its interaction with the magnetic field leads to torque transfer. Three methods are commonly used to calculate the electromagnetic field of permanent-magnet couplers, namely, the traditional analytical method, the finite element method, and the equivalent magnetic circuit method. The 3D finite element method can consider the influence of multiple effects simultaneously to achieve high-precision magnetic field analysis; the calculation takes longer time, and it is inconvenient to be used in the initial and optimal design where multiple variables may change in a wide range.. Wang utilized the permanent magnet area as the source of the traveling wave magnetic field and solved the multi-layer boundary value problem for analyzing the magnetic field distribution Dai proposed a permanent-magnet coupler prediction model considering the groove and core protrusion effects on the ejection vortex in a conductor and the interaction among neighboring conductive spokes. The accuracy of the theoretical model is verified using finite element simulations and experiments
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