[关键词]
[摘要]
设计了一种表贴式永磁直线同步电机无传感器控制算法。为克服低速运行时定子反电势过低不易观测的弊端,在静止坐标系下建立了定子电压的积分数学模型,将反电势观测项解耦为幅值固定易测的积分项。由于观测噪声的影响,通过传统直接计算法获得的速度信号毛刺现象较为严重,为此算法采用锁相环技术(PLL)对转子的位置和速度信号进行提取。建立PLL的二阶频域数学模型分析其稳态性能,并在输入信号存在相位阶跃、频率阶跃、频率斜升的情况下分别讨论了PLL的动态跟踪能力。仿真结果表明,算法能够实现转子位置、速度的准确观测,所构建的控制系统具有良好的稳定性和可控性。
[Key word]
[Abstract]
A sensorless control algorithm for surface PMLSM was designed. To overcome the drawback that the stator′s back EMF was too low to observe at low speed, an integral mathematical model of stator voltage was established in stationary reference frame axes, and the back EMF observation term was decoupled into an integral term with fixed amplitude and could be easily measured. Because of the influence of observation noise, the burr phenomenon of velocity signal obtained by traditional direct calculation method was serious. This algorithm used phase locked loop technology (PLL) to extract rotor position and speed signal. The secondorder frequency domain mathematical model of PLL was established to analyze its steadystate performance, and the dynamic tracking ability of PLL was discussed in the presence of phase jump, frequency step and frequency ramp of input signal. The simulation results showed that the algorithm could realize accurate observation of the rotor position and speed, and the control system had good stability and controllability.
[中图分类号]
TM 301.2
[基金项目]
国家自然科学基金项目(51475462)