Stability Judging Method for Motor Driver Fed by Voltage-type Inverter Based on Different Geometry Theory

摘要

Driver system with three-phase induction motor fed by voltage-type inverter is researched on stability characteristics by the method of different geometry. On some special manifolds, this system, which is of multi-variables, nonlinear and strong coupling, can be mapped as two linear sub-systems independently. 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 as positive and its different sign can be not changed. By applied this method on Y-series induction motor made in China fed by inverter, it can meet the needs of industry driver system.