Z源逆变器驱动的无位置传感器无刷直流电机反电势过零点检测方法

发布时间：2018-08-02 07:46

【摘要】：基于Z源逆变器,该文提出了一种无位置传感器无刷直流电机的反电势过零点检测方法。使用单通道电压比较器,该方法在直通矢量作用下对虚拟中性点电压和中点电压进行比较。由于有效矢量和零矢量被专用于调速,提出的方法具有较宽的工作范围。文中分析了各矢量作用下的虚拟中性点电压,优选了中点电压作为参考电平,从而减小了由功率器件导通压降带来的检测误差。直通矢量作用下,虚拟中性点电压和中点电压均不含电源电压参量,避免了分压衰减导致的信噪比降低。Z源逆变器还提高了电源电压利用率,并提高了电机系统的安全性和可靠性。实验结果验证了理论的正确性和方法的可行性。
[Abstract]:Based on Z source inverter, this paper presents a method for detecting the zero crossing point of the back EMF of a sensorless brushless DC motor (BLDCM). Using a single channel voltage comparator, this method compares the virtual neutral voltage with the midpoint voltage under the action of a through vector. Because the effective vector and zero vector are specially used in the speed regulation, the proposed method has a wide range of work. In this paper, the virtual neutral voltage under the action of each vector is analyzed, and the neutral voltage is selected as the reference level, thus reducing the detection error caused by the on-voltage drop of the power device. Under the action of direct-through vector, both the virtual neutral voltage and the midpoint voltage do not contain the voltage parameters of the power supply, thus avoiding the decrease of SNR caused by the attenuating of the partial voltage. Z source inverter also improves the utilization ratio of the power supply voltage. The safety and reliability of the motor system are improved. The experimental results verify the correctness of the theory and the feasibility of the method.
【作者单位】：天津市电机系统先进设计与智能控制技术工程中心;天津大学电气自动化与信息工程学院;
【基金】：国家重点基础研究发展计划项目(973计划)(2013CB 035600) 国家自然科学基金项目(51577126)~~
【分类号】：TM33

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