基于全速域混合控制的同步磁阻电机无传感器矢量控制系统

针织大圆机的特殊运动状态要求其驱动电机具有较大的启动和带载能力以及较高的稳态运行精度，同步磁阻电机是一种应用于针织大圆机的理想电机，但现有同步磁阻电机无传感器控制，存在转子位置估计误差大、速度切换不平滑等问题。对此，提出一种基于全速域混合控制的同步磁阻电机无传感器矢量控制系统，零速和低速时采用脉振高频电流注入法，通过在估计坐标系的d轴注入一个幅值恰当的高频电流信号，使用估计q轴的高频电压信号估计转子位置；中速和高速时采用模型参考自适应法，通过建立数学模型并对其进行稳定性分析来估计转子位置；为了实现零速和低速到中高速的速度切换，提出一种改进的过渡区域融合观测方案，采用正弦型饱和函数代替传统的线性切换函数进行位置融合。为了验证方案的有效性，搭建了平台进行测试。由结果表明，该方案启动过程带载能力强，切换过程平滑且稳定，稳态运行过程波动小，是一种较适合大圆机电机驱动的无传感器矢量控制方法。

Sensorless Vector Control System of Synchronous Reluctance Motor Based on Hybrid Control in Full Speed Domain

The special process of the knitting circular knitting machine requires its drive motor to have large starting and loading capacity and high steady-state operation accuracy. Synchronous reluctance motor is an ideal motor for knitting circular knitting machines. However, the sensorless control of the existing synchronous reluctance motor has the problem of low rotor position estimation accuracy. In this regard, a synchronous reluctance motor sensorless vector control system based on full-speed domain hybrid control is proposed. The pulsed high-frequency current injection method is used at zero speed and low speed, and an appropriate amplitude is injected into the d-axis of the estimated coordinate system. Use the high-frequency voltage signal to estimate the q-axis to estimate the rotor position; use the model reference adaptive method at medium and high speeds to estimate the rotor position by establishing a mathematical model and performing stability analysis on it; in order to achieve zero To switch between high-speed and low-speed to medium-high speed, an improved transition zone fusion observation scheme is proposed, and a sinusoidal saturation function is used to replace the traditional linear switching function for position fusion. In order to verify the effectiveness of the program, a platform was built for testing. The results show that the program has strong load capacity during the startup process, smooth and stable switching process, and small fluctuation during steady-state operation. It is a sensorless vector control method that is more suitable for large circular knitting motors.