A method and device for control of three-phase machines with dynamically high-quality detection of the required in the electrically steady state stator voltages

摘要

In the case of field-oriented regulation of asynchronous machines, and in the case of corresponding control methods for permanent-magnet energised (excited) synchronous machines, problems relating to current regulation have existed until now. In the case of regulation of asynchronous machines, there are further additional difficult problems relating to the modelling of the field angle and of the magnetisation state of the asynchronous machine to be regulated. The solutions which have been known in the past for this purpose are either linked with only modest quality or with a considerable cost, particularly when they relate to the regulation of asynchronous machines. The present invention in this context allows: - dynamically extremely high-quality detection of the stator voltages, which are required in the electrical steady state, of the three-phase machine to be regulated, from the system itself, - current regulation, which is likewise extremely high quality and dynamic, by these voltages being passed on to the current control loops, - the construction of rotation-speed regulating systems, which have no sensors, for three-phase machines using these voltages, and - continuous matching of the models, which are required in the reference system, of the field angle and of the magnetisation state of an asynchronous machine to be regulated, to the actual conditions, using these voltages. IMAGE