Comprehensive Cost Optimization Study of High-Efficiency Brushless Synchronous Machines
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IEMDC 2013, 9th IEEE International Electric Machines and Drives Conference
Due to the increasing signi?cance of energy saving, multiple regulations have been introduced by countries or international organizations regarding the ef?ciency of electric drives, e.g. the IEC160034-30 . In the past, many companies replaced induction machines (IMs) by permanet magnet excited synchronous machines (PMSMs). This lead to a considerable increase of the ef?ciency, but due to the ?uctuating price of the permanent magnets, especially of Neodymium-Iron-Boron(NdFeB)-magnets, the cost of PMSMs is hardly predictable. Therefore, many manufacturers are investigating in synchronous reluctance machines (SyncRM) now. In this article, the motor design for standardized rated power Prate = 3kW and nominal synchronous speed of nrate = 1500rpm is taken into consideration. Different motor topologies are analyzed regarding the trade-off between ef?ciency and material costs, including PMSMs and SyncRMs. This is done for two different cost scenarios. Finally, the cheapest designs that ful?ll the IE-2 and IE-3 requirements, respectively, can be determined.