This paper improves the position sensorless drive by sensing actual machine phase voltages. A high-bandwidth phase voltage measurement is developed for pulsewidth modulation (PWM) voltage inverters. On the basis, the actual phase voltage is obtained based on the digital integration of PWM voltage using the capture modulator in existing drive microcontrollers (MCU's). Comparing to existing phase voltage measurement, no separated A/D converter and communication hardware are required because PWM pulses are directly measured using MCUs. However, for standard machines without neutral points, only line-to-line ac PWM voltages can be measured for the phase voltage reconstruction. Since the capture based on transistor-transistor logic (TTL) logics receives only digital signals, a preprocess circuit to convert ac PWM line voltages to equivalent digital signals is proposed. This paper clearly explains the voltage sensing hardware using MCU capture modulator. According to experimental results, a 150-MHz sampling rate for phase voltage measurement is achieved based on the proposed capture-based voltage measurement. Although the physical limitation of back electromotive force estimation still appears, the proposed phase voltage measurement substantially enhances the sensorless drive performance at low speed.

中文翻译：

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使用控制器捕获调制器测量永磁电机无传感器驱动器的相电压


本文通过检测实际机器相电压来改进无位置传感器驱动。为脉宽调制 (PWM) 电压逆变器开发了高带宽相电压测量。在此基础上，使用现有驱动微控制器 (MCU) 中的捕获调制器对 PWM 电压进行数字积分，从而获得实际相电压。与现有的相电压测量相比，不需要单独的 A/D 转换器和通信硬件，因为 PWM 脉冲是使用 MCU 直接测量的。然而，对于没有中性点的标准机器，只能测量线间交流 PWM 电压来重建相电压。由于基于晶体管-晶体管逻辑 (TTL) 逻辑的捕获仅接收数字信号，因此提出了一种将交流 PWM 线路电压转换为等效数字信号的预处理电路。本文清楚地解释了使用 MCU 捕获调制器的电压传感硬件。根据实验结果，基于所提出的基于捕获的电压测量实现了 150 MHz 的相电压测量采样率。尽管反电动势估计的物理限制仍然存在，但所提出的相电压测量大大增强了低速下的无传感器驱动性能。