In encoderless field-oriented-controlled permanent magnet synchronous motor (PMSM) drives, current sensors may malfunction in harsh working environments. A current sensor fault-tolerant control (FTC) strategy with a single sliding mode observer (SMO) is proposed in this article, which can achieve both phase current error construction and rotor position estimation. This strategy can simplify the system structure and reduce the FTC algorithm complexity. By utilizing the current error construction module, the estimated current error can be obtained from the healthy current sensor. The parameter design of the construction module is investigated to improve the performance. The stability and the convergence rate of the observer can be ensured by selecting appropriate sliding mode parameters. As the proposed current error construction module is independent of motor parameters and the SMO is also less affected by the motor parameter variation, the proposed FTC strategy owns satisfactory robustness. Finally, the effectiveness of the proposed scheme is verified by experiments on a 2.2-kW PMSM drive platform.

中文翻译：

---

基于单滑模观测器的无编码器永磁同步电机驱动电流传感器容错控制策略

在无编码器磁场定向控制永磁同步电机 (PMSM) 驱动器中，电流传感器可能会在恶劣的工作环境中出现故障。本文提出了一种具有单滑模观测器 (SMO) 的电流传感器容错控制 (FTC) 策略，该策略可以实现相电流误差构建和转子位置估计。这种策略可以简化系统结构，降低FTC算法的复杂度。通过利用电流误差构建模块，可以从健康的电流传感器中获得估计的电流误差。研究了构建模块的参数设计以提高性能。选择合适的滑模参数可以保证观测器的稳定性和收敛速度。由于所提出的电流误差构建模块与电机参数无关，并且 SMO 受电机参数变化的影响也较小，因此所提出的 FTC 策略具有令人满意的鲁棒性。最后，通过在 2.2 kW PMSM 驱动平台上的实验验证了所提出方案的有效性。