In　this　article,　a　clear　analytical　model　for　predicting　the　performance　of　permanent　magnet　(PM)　eddy　current　couplers　is　proposed.　The　interaction　of　the　reaction　magnetic　fields　between　adjacent　eddy　current　rings　was　considered　for　the　first　time.　Based　on　a　magnetic　equivalent　circuit　(MEC)　and　the　Ampere　circuital　theorem,　the　accurate　distribution　of　the　air　gap　magnetic　field　under　different　slip　velocities　was　deduced　in　a　2-D　model,　and　the　analytical　expression　of　the　transmission　torque　was　obtained.　3-D　effects　were　also　taken　into　account　to　calibrate　the　model.　The　validity　of　the　analytical　model　was　verified　by　comparison　with　results　from　the　3-D　finite　element　method　(FEM).　The　comparison　shows　that　the　analytical　model　can　accurately　predict　the　magnetic　field　distribution　and　transmission　torque　over　a　wide　range　of　slip　velocity　variations.　This　model　can　greatly　reduce　the　number　of　calculations　required　and　save　time,　and　it　is　suitable　for　the　preliminary　design　and　optimization　of　PM　eddy　current　couplers.