Mathematical simulation of brushless double stator axial flux magnetoelectric generator for small power electric complexes

Abstract

This paper presents the design of a magneto-electric generator with an axial magnetic flux (MEGAP) and a double stator, which is used for an autonomous wind-electric complex. Contactless MEGAPs have the advantages of permanent magnet generators: high reliability, efficiency; and generators with electromagnetic excitation: the possibility of adjusting the output parameters (voltage, power) using an additional excitation winding. In order to meet the requirements of a stand-alone multiplier-less wind power plant, a MEGAP structure consisting of a double stator and a single rotor has been investigated. The use of a double stator design allows more efficient use of the active volume of the generator, increasing its power and stabilizing the output voltage of the stator winding. A three-dimensional numerical field mathematical model of MEGAP was developed. The model fully takes into account the design features of the generator under study, namely the presence of an axial flow from the stator winding and the flow generated by the additional winding. With the help of the model, the external characteristics were calculated, which indicates the correspondence of the developed mathematical model to physical processes. The analysis of magnetic induction in the air gap and in other structural elements of the generator under study was carried out. The analysis of the obtained values showed that the geometric dimensions of the generator, which were previously selected, are correct and do not require significant adjustments. In the future, it allows you to use the results of this calculation for the preparation of documentation for the production of the prototype. Static characteristics of MEGAP and values of magnetic parameters in all structural elements were studied. An additional winding is used to stabilize the output voltage when the speed of rotation of the generator changes and at different loads. At a relative power of the additional winding of ≈7%, the output voltage of the generator increases by ≈24%. A more significant result can be achieved by adjusting the current of the additional winding with special controllers