Study of synchronous machines with permanent magnets and sintered core for wind turbines application

Abstract

his work aims to present the study of synchronous electrical machines with permanent magnets for use in wind turbines, where the rotor, usually built from laminated sheets of low carbon steel and FeSi, will be replaced by sintered alloys obtained from Powder Metallurgy. Thus, in this work, studies will be conducted in order to verify the feasibility of using pure iron and some sintered alloys, such as FeSi and FeNi, to construct the referred rotor. These materials will be characterized in terms of their physical properties as well as simulations of the machine will be carried out in three different topologies of the rotors. Two machines have the magnets bonded to the surface of the rotors, with two different configurations, namely straight poles and poles protruding, and the third one has the magnets inserted inside the rotor core. The simulations results of different topologies pointed out that for machines with rolled sheet, the best-sintered alloy in order to replace the rotor core would be Fe-2%P. The worst case would be the machine with magnets embedded having the other two similar torque results.