‘Design optimization of axial flux permanent magnet generators using a soft magnetic powder composite iron core for locally manufactured pico-hydro plants‘

Abstract

In this work, axial flux permanent magnet generators are studied as parts of locally manufactured small hydro turbines in off-grid systems. The majority of these generators are manufactured today without an iron core. Despite the drawbacks of the iron core existence, in terms of cogging torque and power losses, a topology has been studied with iron powder in the stator core.

At the beginning of the work, an introduction to the concepts of intermediate technology and small autonomous energy systems is made, as well as to the role that small hydro systems can have in meeting human needs while preserving the environment.

The operation of axial flux permanent magnet generators is analyzed in theory and the subject of the core material of these generators is investigated. Subsequently, generators with a stator core are designed and simulated for different topologies and the magnet dimensions for each of them are optimized according to efficiency and cost criteria.

Finally, two 350W generators with stator cores are manufactured in two different topologies, single rotor and double rotor respectively. Their performances are compared in the lab with the performance of an equivalent power typical coreless generator.

Key words: small hydro turbine, low cost, axial flux generator, permanent magnets, direct battery connection, stator core, iron powder

Author: Alexandros Konstantinidis

Responsible PhD: Kostas Latoufis / latoufis@power.ece.ntua.gr

Supervising Professor: Nikos Hatziargyriou / nh@power.ece.ntua.gr

PDF: Full version (Greek) and Short version (English)

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