Regulation technology of asynchronous machine torque and speed based on vector control

LIU Liming
(Zhejiang Windey Co., Ltd., Hangzhou 310012, China)

Abstract: Aiming at the problem that it has the nonlinearity of the structure and misproportion of the asynchronons machine between current and torque, and accurately control of the torque is difficulty to realize, a theory based on coordinate transformation and field oriented vector control was presented. The asynchronous machine stator current was decomposed into exciting current and torque current. And by regulating exciting current or torque current separately, the control of torque and speed of asynchronous machine was made as simply as the DC machine. A Simulink model was established. And regulation characteristics of torque and speed were analyzed when asynchronous machine running at “no load start”, “ steadystate operation”, “variable speed” and “variable torque” status. The simulation results indicate that, by decomposing stator current into two independent parts with the field oriented vector control technology, both of the torque and speed get pleasant static and dynamic performance.
Key words: asynchronous machine; decoupling; coordinate transformation; field oriented vector control