基于高频信号注入的同步电机无传感器控制

Sensorless Control of Synchronous Motor Based on High Frequency Signal Injection

针对现有低速同步电机无传感器控制精度低、运算复杂的问题,提出了一种适用于静止和低速应用场合的高频电压信号注入的同步电机无传感器驱动控制方法(椭圆拟合技术)。首先,建立了永磁同步电动机(PMSM)的数学模型,分析了椭圆拟合技术判断永磁同步电机转子位置的原理;其次,通过对比线性最小二乘法问题的3种求解方法,显示了QR分解法的优势,并提出了椭圆拟合技术中QR分解原理;最后,在两种不同的控制平台下进行了实验验证。结果表明所提出的椭圆拟合技术不受信号处理延迟效应的影响,响应速度快;只需调整遗忘因子一个参数,设置简单,适用于工业领域的广泛应用。

Aiming at the problems of the existing low-speed synchronous motor sensorless control accuracy and complex operation,a sensorless drive control method of synchronous motor(ellipse fitting technology)for high-frequency voltage signal injection suitable for static and low-speed applications is proposed.Firstly,the mathematical model of permanent magnet synchronous motor(PMSM)is established,and the principle of elliptical fitting technology to determine the rotor position of PMSM is analyzed.Then,by comparing the three solving methods of linear least squares problem,it shows the advantages of QR factorization method,and puts forward the principle of QR factorization in ellipse fitting technology.Finally,experiments are carried out on two different control platforms.The results show that the proposed ellipse fitting technology is not affected by the delay effect of signal processing,and the response speed is fast.It only needs to adjust a parameter of forgetting factor,which is simple to set and suitable for wide application in industrial field.