In　order　to　solve　the　problem　of　generator　output　voltage　instability　caused　by　mud　flow　instability,　the　electromagnetic　damping　generator　(EDG)　with　stable　output　voltage　is　innovatively　designed,　and　the　contradiction　matrix　based　on　TRIZ　theory.　According　to　the　invention　principle　＂23　feedback＂　corresponding　to　＂9　Speed＂　and　＂31　Harmful　factors　produced　by　objects＂,　the　structure　scheme　of　EDG　is　proposed　by　coaxial　assembly　of　generator　and　eddy　current　retarder　(ECR).　According　to　the　technical　index,　the　generator　part　is　calculated　theoretically.　The　accuracy　of　theoretical　calculation　and　the　feasibility　of　innovative　design　are　verified　by　Finite　Element　Method　(FEM).　The　output　voltage　and　power　generation　efficiency　of　the　generator　and　the　braking　torque　of　the　ECR　are　calculated　by　FEM.　The　innovative　EDG　can　adjust　40　V　voltage　to　meet　the　design　requirements.