In　order　to　improve　the　vibration　and　noise　level　of　permanent　magnet　synchronous　motor,　based　on　the　ANSYS　workbench　multi-physical　field　coupling　platform,　the　motor　structure　is　designed　and　simulated　to　optimize　the　vibration　and　noise　of　the　motor.　The　spatial　and　temporal　order　of　the　vibration　noise　caused　by　the　first　order　tooth　harmonic　is　analysed,　and　the　vibration　noise　caused　by　the　first　order　tooth　harmonic　is　reduced　by　slotting　the　rotor.　By　analysing　the　influence　of　rotor　slots　with　different　positions　and　different　size　parameters　on　the　air　gap　magnetic　flux　density　of　the　motor,　the　most　suitable　optimization　method　is　found,　and　the　optimization　level　of　air　gap　magnetic　flux　density　of　rotor　slots　with　different　shapes　under　the　same　position　and　slot　area　is　analysed　and　compared,　so　as　to　select　the　most　suitable　rotor　slot　shape.　The　simulation　analysis　shows　that　the　air　gap　magnetic　density　and　torque　ripple　of　the　optimized　motor　have　been　significantly　improved,　and　the　electromagnetic　noise　of　48-time　order　caused　by　12　times　the　electromagnetic　frequency　of　the　motor　in　the　0　space　order　has　been　significantly　reduced,　which　proves　the　reliability　of　the　optimized　scheme.　©　Editura　ELECTRA　2023.　All　rights　reserved.