Optimization Of Flux Observation For Asynchronous Motor

In order to alleviate the global greenhouse effect intensifying and realize the environmental protection,the world actively promote low-carbon development,and sustainable development strategy.Under the multiple pressures of environment pollution and greenhouse effect in recent days,electric vehicles is one of the alternatives of fuel vehicles.The AC machines have been widely applied in various industrial applications such as EV drives,CNC machines.Because the research of control strategy gradually thorough,higher performance requirements such as controlling precision and respond speed is needed.There are three kinds of methods,which are Constant Voltage Frequency Ratio Control,Direct Torque Control,and Vector Control.But compare with the others,it is widely use in various fields because of its obvious advantages.As a method,it is preferred by many researchers and is used in the majority of world.The people think out how the asynchronous motor does achieve high-precision speed under global greenhouse this background.The high-precision of rotor-field oriented vector has become the utmost necessity and urgency,so the research on this subject has a certain practical significance.The mathematical model of asynchronous motor is not only the foundation of the whole study,and will always run through the article.However,because of the complexity and uncertainty of the mathematical model of asynchronous motor,people pay more attention to how to design simplified model.Based on the mathematical points,people use coordinate transformation which replaces a set of old numbers with new ones to simplify the mathematical model.Based on the mathematical points,people use coordinate transformation which replaces a set of old numbers with new ones to simplify the mathematical model.In the whole control progress for the EV,the precision of rotor flux plays an important part,and it is the crucial to vector control.Based on much literature,a mix model flux observer 2 which include the advantages of current and voltage model flux observer,has been proposed.When it is under no load or load running,the phrase and amplitude of rotor flux can keep certain accuracy.Moreover,when the rotor resistance and stator resistance changes in a certain range,the accuracy of rotor flux in mix model flux observer 2 is better than others.