The　radiated　electromagnetic　interference　(EMI)　behavior　may　have　a　negative　impact　on　the　machining　accuracy　of　grinding　machines.　Therefore,　this　paper　focuses　on　the　radiated　EMI　generated　by　an　ultra-precision　pulsewidth　modulation　permanent-magnet　synchronous　motor　(PMSM)　drive　system.　The　excitation　for　the　radiated　EMI　model,　the　common-mode　(CM)　ground　current　at　the　output　terminal　of　the　converter,　is　obtained　by　simulating　its　conducted　EMI　model.　The　reasonable　simplified　FE　models　for　the　converter　frame,　the　shielded　power　cable,　and　the　motor　frame　are　established.　In　addition,　an　equivalent　circuit　macro　model　of　the　CM　impedance　of　the　three-phase　PMSM　windings　is　obtained　by　using　impedance　measurements,　the　vector　fitting　method,　and　the　fast　residue　perturbation　method.　Finally,　the　3-D　time　harmonic　field-circuit　coupled　finite-element　method　is　employed　to　evaluate　the　radiated　EMI.