This paper proposes a high-frequency (HF) square wave voltage signal injection strategy for interior permanent magnet synchronous motor (IPMSM) maximum torque per ampere (MTPA) drives. Unlike previous methods, this strategy injects a square wave HF signal into the voltage directly regardless of the current loop bandwidth limitations. In addition, the injected frequency can surpass the cut-off frequency of the current loop. Therefore, the disturbance caused by the injected signal can be reduced. The process of MTPA operating point adjustment only needs to sample and analyze the current amplitude without additional digital filters. Thus, the dynamic response promotes, and avoids the extra hardware and calculation burden. To decrease the convergence time when the load changes rapidly, an equivalent mathematical model of an IPMSM is employed to provide prior current references. Both simulation and experimental results confirm the validity and feasibility of the proposed strategy.

本文提出了一种用于内置永磁同步电机 (IPMSM) 最大每安培转矩 (MTPA) 驱动器的高频 (HF) 方波电压信号注入策略。与以前的方法不同，该策略直接将方波 HF 信号注入电压，而不管电流环路带宽限制如何。此外，注入频率可以超过电流回路的截止频率。因此，可以减少由注入信号引起的干扰。MTPA工作点调整过程只需要对电流幅度进行采样分析，无需额外的数字滤波器。因此，动态响应提升，避免了额外的硬件和计算负担。为了减少负载快速变化时的收敛时间，IPMSM 的等效数学模型用于提供先前的电流参考。仿真和实验结果都证实了所提出策略的有效性和可行性。