Flux orientation of asynchronous machine supply having a cage current supply ´rotor flux estimation´

This article is aimed at the study and numerical simulation of indirect rotor flux orientation vector control of an asynchronous machine having a cage supplied by an indirect frequency converter having an intermediate continuous current circuit. The latter consists of a rectifier drive supply, via a smoothing coil, a current modulator (commutator) of isolated diodes. The study of the modeling of the asynchronous machine in a transient regime is a primary stage before approaching all command strategies. This study allows fixing of the mathematical model conforming to a type of supply (current) and to a type of vector control utilisation (rotor flux orientation). The theoretical analysis permits estimation of the flux, the torque and the pulsation of the slip as part of the dimensions measurements. The law of command of the system is directly deduced from the estimated dimensions. This leads to a group of flowcharts permitting translation of the equations and the laws obtained under the form of programs. The latter consist of a simulation tool, and aid the concept of the machine-current commutator system