垂直运行永磁直线同步电机的失步预防策略研究

在对垂直运行永磁直线同步电机的力角特性分析的基础上，研究了供电频率和供电电压对该电机运行稳定性的影响，利用模糊控制理论，建立了基于模糊控制的垂直运行永磁直线同步电机的失步预防策略。该策略采用双模态模糊控制结构，以功角的稳定余量为控制量，采用改变供电电压和改变电机运行速度的方法，预防该电机失步发生。实验结果表明，该策略能够有效地提高垂直运行的永磁直线电机运行的稳定性、安全性，并且能够达到预期的控制效果。

The out-of-step preventing strategy of permanent magnet linear synchronous motor moving for vertical movement

Based on the analysis of power angle characteristics of the permanent magnet linear synchronous motor moving for vertical movement,studied line frequency and power supply voltage’s effect for the moving stability,and used fuzzy control theory to set up out of step prevention strategy.The strategy introduced dual mode fuzzy control structure,made power angle stability margin as the controlling and adopted the strategy of changing the power supply voltage and operating speed to prevent the occurrence of out of step.Experimental results show that the strategy can effectively improve system’s stability and security,and reach the expected results.