Eddy　current　brakes　(ECB)　are　widely　installed　on　heavy-duty　vehicles　to　improve　driving　safety　and　economy.　When　the　ECB　works,　the　mechanical　energy　of　the　vehicle　is　converted　into　thermal　energy　under　the　action　of　the　electromagnetic　field,　which　is　a　process　of　mutual　influence　between　the　electromagnetic　field　and　temperature　field,　and　this　process　can　be　simulated　by　establishing　a　transient　Magneto-thermal　coupling　model　with　bidirectional　data　transmission.　However,　due　to　the　long　calculation　time　required　for　accurate　3D　electromagnetic　analysis,　the　above　model　must　be　simplified.　The　parameter　sensitivity　analysis　of　the　ECB　shows　that　the　temperature　of　the　eddy　current　generating　location　directly　affects　the　braking　torque.　Through　the　3D　electromagnetic　field　numerical　analysis,　the　mapping　relationship　between　the　temperature　of　the　eddy　current　generating　layer　and　the　braking　torque　is　established　and　brought　into　the　transient　heat　transfer　model.　The　finite　difference　method　is　used　to　calculate　the　heat　transfer　model.　The　calculation　results　can　predict　and　analyze　the　braking　performance　of　the　ECB　during　its　working　process.　©　1967-2012　IEEE.