In this article, a novel current error calibration scheme considering noncentral sampling is proposed for an open winding permanent magnet synchronous motor (OW-PMSM) drive with a single current sensor. To realize the current reconstruction using a single current sensor, the durations of measurement vectors need to last long enough. Besides, the pulsewidth modulation (PWM) of the dual inverters is complicated, where the switching signals of two inverters need to be calculated simultaneously. Hence, the modified PWM strategy is developed to simplify the PWM procedure and extend the duration of measurement vectors. Nevertheless, the sampling error exists, because the bus current samplings take place sequentially at the measurement vectors instead of simultaneously at the central point. This will lead to a significant error in the reconstructed current, degrading the operation performance. Therefore, an online current calibration scheme is proposed to compensate for the current sampling error, which requires neither observer nor offline measurement to obtain the back electromotive force (back EMF). With the proposed calibration strategy, the precision of the reconstructed current can be significantly improved. Experiments are performed on an OW-PMSM drive to verify the effectiveness of the proposed strategy.

中文翻译：

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单电流传感器 OW-PMSM 驱动考虑非中心采样的电流重构误差标定

在本文中，针对具有单个电流传感器的开绕组永磁同步电机 (OW-PMSM) 驱动提出了一种考虑非中心采样的新型电流误差校准方案。为了使用单个电流传感器实现电流重构，测量矢量的持续时间需要足够长。此外，双逆变器的脉宽调制（PWM）比较复杂，需要同时计算两个逆变器的开关信号。因此，改进的 PWM 策略被开发出来以简化 PWM 程序并延长测量向量的持续时间。尽管如此，还是存在采样误差，因为母线电流采样是在测量向量处顺序进行的，而不是同时在中心点进行的。这将导致重构电流出现重大误差，从而降低操作性能。因此，提出了一种在线电流校准方案来补偿电流采样误差，该方案既不需要观察者也不需要离线测量来获得反电动势（back EMF）。通过所提出的校准策略，可以显着提高重构电流的精度。在 OW-PMSM 驱动器上进行实验以验证所提出策略的有效性。可以显着提高重构电流的精度。在 OW-PMSM 驱动器上进行实验以验证所提出策略的有效性。可以显着提高重构电流的精度。在 OW-PMSM 驱动器上进行实验以验证所提出策略的有效性。