This paper proposes a simple and cost-effective current measurement technique for four-phase switched reluctance motor (SRM) control, by splitting the dual bus line of the converter, without pulse injection and voltage penalty. Only two Hall-effect sensors are utilized, where one is installed in the upper bus to measure two phase currents, and the other is placed in the lower bus to measure other two phase currents. In order to realize independent current measurement in the whole turn-on region, switching functions are redesigned so that upper switches of two phases act as the choppers, while lower switches of the other two phases are employed as the choppers. Compared to traditional drives, the developed system requires only two Hall-effect sensors in the dual bus line, without a need for individual phase sensors or additional devices, which reduces the cost and volume for SRM drives. Furthermore, compared to the single-sensor based current measurement scheme, the proposed method has no need to implement pulse injection and will not cause any voltage penalty and current distortion, which also improve the current measurement accuracy and system performance. Simulation and experiments carried out on a 150-W four-phase 8/6 SRM confirm the effectiveness of the proposed technique.

中文翻译：

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无脉冲注入和电压惩罚的分体双总线四相 SRM 控制的经济高效的电流测量技术

本文提出了一种用于四相开关磁阻电机 (SRM) 控制的简单且经济高效的电流测量技术，通过拆分转换器的双总线线路，没有脉冲注入和电压损失。仅使用两个霍尔效应传感器，其中一个安装在上部母线中以测量两相电流，另一个放置在下部母线中以测量其他两相电流。为了在整个导通区域实现独立的电流测量，重新设计了开关功能，使两相上的开关作为斩波器，而其他两相的下开关作为斩波器。与传统驱动器相比，开发的系统在双总线中只需要两个霍尔效应传感器，无需单独的相位传感器或附加设备，这降低了 SRM 驱动器的成本和体积。此外，与基于单传感器的电流测量方案相比，所提出的方法不需要实施脉冲注入，不会造成任何电压损失和电流失真，这也提高了电流测量精度和系统性能。在 150 W 四相 8/6 SRM 上进行的模拟和实验证实了所提出技术的有效性。