Transmitted torque of permanent magnet couplers (PMCs) is the core index to evaluate its transmission performance. A semi-analytical calculation method for transmitted torque of the PMC is established to solve those problems that the analytic method is difficult to fully consider the specific details of the three-dimensional (3D) PMC, the calculation accuracy is insufficient, and the finite element model (FEM) has numerical oscillation and the calculation accuracy is float. The analytical model and the FEM are combined in this method, can effectively calculate and predict the transmission performance of the permanent magnet coupler. First, according to geometric structure, a magnetic equivalent circuit model is established to solve internal magnetic induction intensity. Based on the relationship between the eddy current density and the magnetic induction intensity, and considering the 3D end effect, an analytical model of transmitted torque is constructed. Second, a 3D FEM of the unipolar PMC is established, and the transmission performance by the finite element calculation is obtained. On this basis, using the entropy method to combine the magnetic circuit equivalent model with the FEM, a semi-analytical calculation method for the transmitted torque is presented. Finally, an experimental platform is built to verify the method. The results show that under normal working conditions, the proposed method for calculating the transmitted torque has a good consistency, and the relative error is within 6.5%. This method can provide a theoretical basis for the analysis, design, and optimization of PMCs.
The permanent magnetic couple is a non-contact transmission device with higher transmission efficiency than a traditional rigid transmission device. Slotting the copper conductor disc on the permanent magnetic coupler can further improve the transmission performance. This paper proposes an optimization calculation model for the slotted permanent magnetic coupler, uses ANSYS Maxwell to simulate and verifies the model to improve the transmission performance. The value of magnet pairs and the slots are 6 and 35 respectively; then we simulate output torque when the slot ratio changes from 0.5 to 0.9. The simulation results verify the accuracy of the optimization model. This paper obtains the optimization scheme of the slotted permanent magnetic coupler under different parameters. The calculation model can guide the determination of a slotted permanent magnetic coupler, which is of great significance to improve the efficiency of the transmission system.
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