Abstract
To improve the output torque in permanent magnet (PM) eddy current couplings, a new structure based on harmonics injection into the magnet optimization theory is proposed. Then, a novel analytical electromagnetic-thermal model is established that can accurately reflect the 3-D distributions of the magnetic field and the eddy current. With the proposed analytical model, the eddy current loss, temperature distribution, torque characteristics and influence of the temperature rise caused by load increases on the torque are predicted and analyzed precisely. The maximum output torque can be improved by 11.22% with injected harmonics into the magnet shape. On this basis, an optimal design of the conductor plate structure is presented, based on the electromagnetic-thermal analytical model. An additional 13.05% torque improvement can be obtained, which leads to better torque characteristics and overload capability. Verification is conducted by a 3-D finite element analysis and measurements. The analytical model solves the multiphysics coupling analysis problem of PM eddy current couplings, and provides a fast and accurate calculation method to perform electromagnetic-thermal coupling analysis.
Highlights
As an emerging flexible energy-saving transmission device, the permanent magnet (PM) eddy current coupling can realize torque transmission without rigid contacts and mechanical connections, which changes the operational mode of traditional mechanical transmission [1]–[3]
Except for the PM arrangement and the thickness gradient copper, the PM eddy current coupling with injected harmonics into the magnet shape studied in this paper has the same basic structure and physical parameters as those of the one presented in [21]
A novel electromagnetic-thermal analytical model that can accurately reflect the 3-D distribution of the magnetic field and the eddy current, is presented to analyze the eddy current loss, temperature distribution, and torque characteristics
Summary
As an emerging flexible energy-saving transmission device, the PM eddy current coupling can realize torque transmission without rigid contacts and mechanical connections, which changes the operational mode of traditional mechanical transmission [1]–[3]. Guo: Analytical Prediction and Analysis of Electromagnetic-Thermal Fields in PM Eddy Current Couplings on injected harmonics into the magnet shape is proposed to improve the output torque. To improve the output torque, a new structure of the PM eddy current coupling based on harmonics injection into the magnet optimization theory is proposed, which essentially enhances the sinusoid of the air gap magnetic density. Guo: Analytical Prediction and Analysis of Electromagnetic-Thermal Fields in PM Eddy Current Couplings TABLE 1. The equivalent thermal network model is used to calculate the temperature distribution, which the eddy current loss is used as the heat source for the thermal analysis. Verify whether the electromagnetic characteristics of the PM eddy current coupling with injected harmonics into the magnet shape meet the purpose of improving the output torque. The structural parameters are optimized sequentially, and the electromagnetic-thermal coupling analysis calculation flow is updated, and if so, the calculation result is saved
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