Research on Transmitted Torque Calculation Method of Permanent Magnet Eddy-Current Couplers

doi:10.12068/j.issn.1005-3026.2021.12.010

Abstract

Abstract: As a kind of driving device， the effective calculation of transmitted torque for permanent magnet eddy-current couplers is a significant index to evaluate the transmission performance. For a permanent magnet eddy current coupler with 6 pole pairs and 1450r/min rated input speed， firstly， according to the geometry， finite element method is used to simulate the magnetic field lines and to obtain the magnetic path distribution. Also， through the analysis of leakage fluxes boundary condition， the leakage magnetic resistance and effective magneto motive force are obtained. Secondly， the coordinate system of eddy current on the conductor disk is established. According to the law of skin depth and ampere loop， the magnetic induction intensity equation is constructed which considers the continuity and symmetry of magnetic field distribution. Then， based on the mathematical relationship between eddy-current density and conductivity of the conductor disk， the analytical result of transmitted torque is presented accounting for the three-dimensional end effect. Finally， a prototype test platform and a three-dimensional finite element analytical model are built to verify the method. The results show that the proposed method has good accuracy within the range of speed slip in a certain operation where the relative error is within 6%. Moreover， some reasonable suggestions are put forward for the design optimization of permanent magnet eddy-current couplers.

Key words: permanent magnet eddy-current coupler; magnetic path; leakage magnetic resistance; transmitted torque; experiment

CLC Number:

TH133.4

CHENG Xi-kang， LIU Wei， SUN Ming-hao， LUO Wei-qi. Research on Transmitted Torque Calculation Method of Permanent Magnet Eddy-Current Couplers[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1739-1746.

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