开关磁阻电机无位置传感器控制策略研究
Sensorless control strategy for switched reluctance machines
王青 1蒋宗文 1王林强 1徐鑫莹 1丁家鑫 1刘韬2
作者信息
- 1. 南昌大学 信息工程学院,江西 南昌 330031
- 2. 南昌大学 数学与计算机学院,江西 南昌 330031
- 折叠
摘要
针对开关磁阻电机无位置传感器下的转子位置还原,提出一种基于电流上升时间监测的无位置传感器控制策略,该策略包含初始位置检测、电机启动运行、转子位置重构和调速控制几个部分.首先离线测得电机在特殊位置时滞环带宽内的电流上升时间,作为初始阈值用于电机启动;接着分别对各相绕组注入小电流,比较各相电流在滞环带宽内的上升时间进行初始位置分区;然后将转子从电感下降区进入电感最小区起始点作为特征点,利用初始阈值启动电机并在电机运行过程中依据实时工况更新特征点处时间阈值作为下一周期的检测特征;最后通过检测特征点位置信号对转子进行位置重构和转速估算实现换相与调速.仿真与实验结果验证了所提出控制策略的有效性与准确性.
Abstract
A sensorless control strategy was proposed for switched reluctance motor,which includes initial rotor position monitoring,start-up operation,position reconstruction and speed regulation.First,the cur-rent rise time of phase current within the hysteresis bandwidth at fixed position was measured off-line and stored as initial threshold for the start-up process;then the initial position was partitioned by comparing the current rise time of each phase within the hysteresis bandwidth by small current injection.The motor was then started with the initial threshold,which was updated according to actual operating process.The newly updated threshold was employed as the detection feature for the next period.Then,the rotor posi-tion was reconstructed and the speed was estimated according to detected threshold signal.And commuta-tion and speed regulation were achieved accordingly.In the end,simulation and experimental results were conducted presented to demonstrate effectiveness and accuracy of the proposed sensorless strategy.
关键词
开关磁阻电机/无位置传感器控制/转子位置重构/特征点检测/电流注入Key words
switched reluctance motor/sensorless control/rotor position reconstruction/fixed point detec-tion/current injection引用本文复制引用
基金项目
国家自然科学基金(51967013)
江西省自然科学基金(20212BAB214061)
出版年
2024
NETL
NSTL
维普
万方数据