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一种统一的无刷直流电机直接反电动势法

, PP. 62-68

Keywords: 直接反电动势法,无刷直流电机,PWM,无位置传感器,转子位置检测

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Abstract:

无刷直流电机直接反电势法研究已经得到了比较广泛的开展,但只适用于上管调制、下管恒通的控制方式。在研究无刷直流电机传统模型的基础上,根据无刷直流电机的工作原理,构建了无刷直流电机的简化模型,由此简化模型分析了不同PWM技术断开相端电压的特点,提出了通过在PWM开通期间采样断开相端电压与二分之一的母线电压相比较检测反电动势过零点的方法,并进行了样机实验。实验结果表明提出的方法能在很宽的电机速度范围内,精确地获得不受PWM影响的反电动势过零点。

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