PERFORMANCE ANALYSIS OF AFPM GENERATOR DIRECT DRIVEN WIND TURBINE WITH STORAGE SYSTEM

Abstract

Direct-drive type with no acceleration rare and the windmill blades attached to the disc surface of Axial Flux Permanent Magnet generator (AFPM) realizes simple structure and omission of central dynamic transformation achieves very high energy conversion efficiency of the generator. The generator itself consists of two magnets rotors that return together directly coupled to the blades. In this research study, one magnet rotor is on each side of the stator and each magnet rotor contains 16 Neodymim-Iron-Boron (NdFeB). The stator contains 12 coils wound with copper wire and cast into plastic resin, in line with and between the paths of each magnet. The AFPM generator direct drive wind turbine converts the mechanical energy by the rotating shaft as the wind pushing 3 wooden blades into 3-phase alternating current (AC) electricity that varies in frequency. In order to get this generated power into a battery bank, three-phase bridge rectifier is connected to the three terminals of the machine. The alternator will start 48 volt charging batteries system at about 140 rpm in 4m/s wind speed and reach rated output of 1.8 kW at 375 rpm in 10m/s wind speed. This machine is specially designed for battery charging and it’s probably quite useful and cost effective for remote locations that are not connected to the national grids where conventional methods of energy supply are expensive or impractical.