开关磁阻电机变双电流阈值的无位置传感器技术

发布时间：2018-09-19 08:42

【摘要】：为了实现开关磁阻电机初始位置判断和低速运行位置估计方法统一,提出一种基于双电流阈值电感分区与脉冲注入相结合的开关磁阻电机位置估计方法。利用相电感、脉冲电流以及转子位置之间的关系,通过双电流阈值将电感分成不同区域,用脉冲电流幅值与双电流阈值比较加以识别,得到双电流阈值检索脉冲,利用检索脉冲信号可以估计出转速和转子位置。该方法避免了因电感最大和最小区域电感变化微小而影响到位置估计精度的问题。考虑到电流阈值受母线电压的影响,提出变双电流阈值的方法,实测不同母线电压下电流阈值,由查表获取电流阈值,提高了电流阈值的鲁棒性。以三相12/8结构样机进行了相关实验,实验结果验证了该位置估计方法的可行性。
[Abstract]:In order to realize the unity of initial position estimation and low speed position estimation of switched reluctance motor, a novel position estimation method for switched reluctance motor based on double current threshold inductance partition and pulse injection is proposed. By using the relationship among phase inductance, pulse current and rotor position, the inductor is divided into different regions by double current threshold. The pulse is retrieved by double current threshold, which is identified by comparing the amplitude of pulse current with the double current threshold. The speed and rotor position can be estimated by searching the pulse signal. The method avoids the problem that the position estimation accuracy is affected by the small variation of the inductance in the maximum and minimum region. Considering that the current threshold is affected by the bus voltage, a method of changing the double current threshold is proposed. The current threshold is measured under different bus voltages, and the current threshold is obtained by looking up the table, which improves the robustness of the current threshold. The experimental results show that the position estimation method is feasible with a three-phase prototype of 12 / 8.
【作者单位】：南京航空航天大学自动化学院;
【基金】：国家自然科学基金项目(51377076) 江苏省“六大人才高峰”资助项目(50977044)~~
【分类号】：TM352

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