To　improve　the　system　performance　of　permanent　magnet　synchronous　motor　(PMSM)　with　LC　filter,　a　new　motor　current　estimation　and　control　method　based　on　the　extended　Kalman　filter　(EKF)　is　proposed　in　this　paper.　In　the　EKF　method,　the　inverter　side　current　was　sampled,　the　actual　motor　current　was　obtained　through　the　new　EKF　observer,　and　the　estimated　motor　current　was　used　for　current　loop　feedback.　The　structure　and　parameter　design　of　the　new　EKF　current　observer　were　given,　and　the　system　stability　was　proved　by　Lyapunov　stability　theorem.　The　simulation　results　show　that,　compared　with　the　traditional　Luenberger　observer,　the　new　EKF　observation　method　has　smaller　current　estimation　error　and　better　motor　current　tracking　performance.　The　torque　ripple　and　the　harmonics　can　also　be　effectively　reduced.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.