Application of Brushless Machines with Combine Excitation for a Small and Medium Power Windmills

This article shows the advantages in application of the brushless machines with combine excitation (excitation from permanent magnets and excitation coil) for small and medium power windmills. This type of electric machine is compared with a typical brushless motor and an induction motor. The main advantage is the decreasing of the outline sizes of electric machine and the reduction of price for an electronic control system. The design and the principle of operation of the electric machine are provided. This machine was modeled using Solisworks program to create the design and Maxwell program to analyze the magnetic field. The results of testing are shown too.