【目的】针对采用电感-电容-陷波(LCT)高阶滤波型永磁同步电机(PMSM)电流难以直接检测的问题，本文提出了一种基于扩张状态观测器(ESO)与龙伯格状态观测器(LSO)的电流级联观测方法。【方法】本文所提新型ESO级联方法仅需逆变器侧电流信号，通过LSO获取系统中间状态，并利用ESO实时估计与补偿扰动，实现电机电流的高精度观测。【结果】试验结果表明，在额定工况下，本文所提新型ESO级联方法相比于传统LSO，电机电流观测误差降低3.2%。【结论】本文所提方法能够实现高阶滤波型PMSM电流的高精度观测，且无需额外传感器和硬件改动，有效降低了系统复杂度和成本。

[Objective] Aiming at the difficulty of directly detecting the current in permanent magnet synchronous motor (PMSM) equipped with inductor-capacitor-transformer (LCT) high-order filter, this paper proposes a current cascaded observation method based on an extended state observer (ESO) and a Luenberger state observer (LSO). [Methods] The novel ESO cascaded method proposed in this paper required only the inverter-side current signal. The intermediate system state was obtained through the LSO, and disturbances were estimated and compensated in real-time by the ESO, achieving high-precision observation of the motor current. [Results] The experimental results showed that, under rated conditions, the motor current observation error was reduced by 3.2% with the novel ESO cascaded method proposed in this paper compared to the traditional LSO. [Conclusion] The proposed method achieves high-precision observation of high-order filtered PMSM current without requiring additional sensors or hardware modifications, effectively reducing system complexity and cost.