Stability for motor driver fed by voltage-type inverter
电压型变频器、三相交流异步电动机传动系统的稳定性

The driver system with three-phase induction motor fed by voltage-type inverter is studied in terms of its stability characteristics by the method of differential geometry.On some special manifolds,this system,which is of multi-variables,nonlinear and strong coupling,can be mapped as two independent linear sub-systems.Based on the two-order system's Lyapunov functions,the stability of driver system is analyzed and a novel method of driver system's Lyapunov function is put forward.The function is proved to be positive and its different sign can not be changed.By applying this method to the Y-series made in China,it can meet the needs of the industry driver system.