Abstract
The structure and magnetic circuits of axial-radial combined permanent magnet eddy current couplers are more complicated than those of axial or radial permanent magnet eddy current couplers, the degree of coupling is deeper, which will affect the device performance. In this paper, a novel analytical model for an axial-radial combined permanent magnet eddy current coupler is proposed based on the equivalent magnetic circuit method. The distribution of the magnetic field, the relationship between the slip and torque, the influence of the structural parameters on the transmission performance, the 3-D correction and thermal compensation are studied. Combined with the concept of the micro-element method, the air gap magnetic density, eddy current density and torque are accurately calculated, which solves the problem that the existing model cannot analyse the axial-radial combined structure. To show the effectiveness of the proposed analytical model, the transmission performance of an axial-radial combined permanent magnet eddy current coupler prototype is investigated, and the analytical calculation results are compared with the results of the finite element method simulations and experimental tests.
Highlights
In recent years, permanent magnet eddy current couplers have been adopted in many industrial fields, such as the mining and metallurgical industry, oil and gas industry, chemical industry, and military manufacturing field [1]–[3]
The motor shaft and load shaft are connected to the conductor rotor and permanent magnet rotor, respectively [11]
Based on the analytical method, a new equivalent magnetic circuit model is proposed in literature [24] to calculate the parameter performance of the permanent magnet eddy current coupler
Summary
Permanent magnet eddy current couplers have been adopted in many industrial fields, such as the mining and metallurgical industry, oil and gas industry, chemical industry, and military manufacturing field [1]–[3]. Based on the analytical method, a new equivalent magnetic circuit model is proposed in literature [24] to calculate the parameter performance of the permanent magnet eddy current coupler. Considering the complexity of eddy current distribution in conductor rotor, the following assumptions are put forward in the calculation of eddy current loss and transfer torque by equivalent magnetic circuit method: 1) The magnetic flux leakage of permanent magnet is ignored when the air gap is very small. It is possible to calculate the magnetic flux density on the air gap and the conductor rotor while the eddy current effect and the magnetic field coupling are neglected. COUPLED MAGNETIC CIRCUIT MODELLING, 3-D CORRECTION AND THERMAL COMPENSATION OF AN AXIAL-RADIAL COMBINED PERMANENT MAGNET EDDY CURRENT COUPLER A. According to the boundary conditions, the correction coefficient of the axial-radial combined permanent magnet eddy current coupler can be obtained by using the 3-D correction method ks λm
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