一种改进的开关磁阻电机无位置传感器控制方法

An Improved Sensorless Control Method for Switched Reluctance Motor

开关磁阻电机的无位置传感器控制方法,是近些年研究热点之一。传统单阈值的脉冲注入法,仅采集响应电流峰值进行比较换相,方法简单,但实际应用中易受母线电压波动、电磁噪声干扰、调理电路漂移等影响使得电流采样值不准确,从而导致位置估算误差较大。本文对传统的脉冲注入法进行了改进,提出了一种两相注入比较电流斜率的方法,并使用仿真软件Matlab/Simulink进行了模型搭建,在模型中加入了干扰信号,与传统的单阈值脉冲注入法进行了误差测量与对比。仿真结果表明,本文提出的改进型脉冲注入法能有效克服以上问题,相较于单阈值脉冲注入法更适合工程应用。

The sensorless control method of switched reluctance motor is one of the research hotspots in recent years.The traditional single-threshold pulse injection method only collects the peak value of response current to compare and commutate,which is simple.But in practical application,it is vulnerable to bus voltage fluctuation,electromagnetic noise interference,conditioning circuit drift and so on,which makes the current sampling inaccurate,resulting in large error in position estimation.In this paper,the traditional pulse injection method was improved,and a method of comparing current slope by two-phase injection was proposed.The simulation software Matlab/Simulink was used to build the model.The interference signal was added to the model,and the error was measured and compared with the traditional single-threshold pulse injection method.The simulation results show that the improved pulse injection method proposed in this paper can effectively overcome the above problems and is more suitable for engineering application than the single threshold pulse injection method.