An on-line compensation for the dead time strategy without the knowledge of the current direction is proposed for PMSM drive based on a current observer. The modifications of the motor reference voltages are achieved by an uncomplicated current observer working in conjunction with the feedforward dead time voltage estimator. Therefore, the distortions on phase currents and torque due to dead time are greatly reduced. The proposed method does not require look-up table and coordinate transformations. It also does not need phase current polarity information or calculation of dead time period. Since the proposed scheme requires no extra hardware and time consuming signal processing algorithms, it is appropriate to use in real-time implementation of AC drives. The proposed scheme has been validated in simulation and implemented using TMS320F28335 DSP. Simulation and practical results validate the effectiveness and the feasibility of the proposed scheme.

针对基于电流观测器的永磁同步电机驱动，提出了一种不知道电流方向的死区时间在线补偿策略。电机参考电压的修改是通过一个简单的电流观测器与前馈死区时间电压估计器一起工作来实现的。因此，由于死区时间引起的相电流和转矩失真大大减少。所提出的方法不需要查找表和坐标变换。它也不需要相电流极性信息或死区时间段的计算。由于所提出的方案不需要额外的硬件和耗时的信号处理算法，因此适用于交流驱动器的实时实现。所提出的方案已在仿真中得到验证，并使用 TMS320F28335 DSP 实现。