For saliency-based position sensorless drives, the switching frequency pulsewidth modulation (PWM) voltage injection can achieve noise-free position estimation which is suited for high-performance motion systems. However, considering the switching frequency injection, multiple phase currents should be sampled per PWM cycle instead of single average current. It leads to the implementation issue on the space-vector PWM (SVPWM) inverter using shunt resistor current sensing for machine control. In this article, a modified PWM injection instead of SVPWM injection is proposed for the saliency-based drive using shunt current sensing. It is concluded that at least two transient currents can be sampled per PWM cycle based on the proposed PWM control. More importantly, the field-oriented control is maintained when the saliency-based drive is applied. A 2 kW permanent magnet (PM) machine is used for the experimental verification. This article includes the position estimation comparison using either the proposed PWM injection with shunt resistors or standard SVPWM with Hall-effect sensors.

中文翻译：

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基于凸极的永磁电机位置无传感器驱动器，使用建议的 PWM 注入和基于分流器的电流感应进行位置估计


对于基于凸极的位置无传感器驱动器，开关频率脉宽调制（PWM）电压注入可以实现无噪声位置估计，适合高性能运动系统。然而，考虑到开关频率注入，每个 PWM 周期应采样多个相电流，而不是单个平均电流。这导致了使用分流电阻器电流检测进行机器控制的空间矢量 PWM (SVPWM) 逆变器的实现问题。在本文中，针对使用分流电流感测的基于显着性的驱动，提出了一种改进的 PWM 注入而不是 SVPWM 注入。结论是，基于所提出的 PWM 控制，每个 PWM 周期至少可以采样两个瞬态电流。更重要的是，当应用基于凸极的驱动时，可以保持磁场定向控制。使用 2 kW 永磁 (PM) 电机进行实验验证。本文包括使用建议的带分流电阻器的 PWM 注入或带霍尔效应传感器的标准 SVPWM 的位置估计比较。