Magnetic Coupling Design And Eddy Current Loss Research

Magnetic coupling is a new kind of coupling, which connects motor and machine by permanent magnetic force. It can transfer the torque without contacting, so the static seal can replace the traditional dynamic seal device, and the leakage problem in the industry transmission can be solved. Due to the excellent seal performance of magnetic coupling, it is widely used in the fields which have special requirements on seal, such as oil industry, chemical industry and pharmacy industryIn this paper, the research on magnetic coupling was done systematically from these there aspects, the air gap flux density, static torque and eddy current loss.Firstly, the mathematical model for2-D electromagnetic field analysis was established. According to the electromagnetism theory, the analytic formula to compute the air gap flux density was deduced. The formula’s accuracy was confirmed by the finite element result.Secondly, based on the air gap flux density and the current model, the static torque analytic compute formula was derived, and the Simpson method was used to simplify the formula. Besides, the periodical finite element analysis model of magnetic coupling was established, and the periodical boundary and motion boundary setting was also adopted to acquire the characteristic curve of magnetic coupling and the influence of the main structural parameters on static torque. And the parameter optimization was proposed based on the design concept of material utilization. The result was verified by experiments.Finally, this paper provided an effective and easy method to calculate isolation eddy current loss. This method consummated the existing analytic formula and made the calculation more accurately. In addition, the factors which influence the eddy current loss were studied in this paper, and the effective ways to reduce the eddy current loss were proposed. The effectiveness and correctness were verified by finite element result and experimental results.