Considering　that　the　existing　research　on　the　motor　using　the　structure　optimization　to　reduce　noise　is　difficult　to　further　meet　the　requirements　of　low　noise,　from　the　noise　transmission　path,　a　new　method　of　viscoelastic　free　damping　vibration　and　noise　reduction　based　on　the　high-precision　positioning　of　the　sound　source　is　proposed　in　this　study.　Based　on　the　motor’s　sound　intensity　experiment,　the　sound　intensity　image　is　reconstructed　using　compressive　sensing　and　the　SP　algorithm　to　locate　the　primary　noise　source　precisely.　For　the　design　of　the　damping　layer　laying　scheme,　the　study　of　the　theoretical　influence　of　storage　modulus,　Poisson’s　ratio,　thickness,　and　other　significant　parameters　of　the　asphalt　damping　material　on　the　vibration　characteristics　of　the　motor　housing　is　necessary.　The　motor-free　damping　laying　scheme　is　further　refined　based　on　the　acoustic　contribution　obtained　in　the　simulation　analysis.　The　scheme’s　validity　is　verified　by　applying　a　sinusoidal　sweep　excitation.　The　optimized　motor　is　verified　by　noise　reduction　experiments　under　multiple　working　conditions,　and　experimental　comparison　results　validate　that　the　sound　power　level　of　the　motor　noise　with　accurately　laid　viscoelastic　damping　can　be　reduced　by　up　to　4 dB(A).　©　The　Author(s)　2025.