6

Design Process of Rotating Electrical Machines

In the previous chapters, the general theory governing the design of an electrical machine was presented: Chapter 1 addressed the necessary fundamentals of electromagnetic theory, and Chapter 2 concentrated on winding arrangements. Chapter 3 described the behavior of the magnetic circuit. Chapter 4 discussed the inductances and, finally, Chapter 5 focused on the resistances of the windings. We should now be able to commence the discussion of the design process of the electrical machine. However, before entering the final design phase we have to study the eco-design principles of electrical machines. The target of the eco-design regulations is to reduce the life-cycle impacts of manufacturing and using motors.

6.1 Eco-Design Principles of Rotating Electrical Machines

Electric motors, which are marketed in the European Union area, have to fulfill the eco-design requirements for electric motors (Directive 2009/125/EC, Commission Regulation 640/2009). The aim of the requirements is to reduce the energy consumption and environmental impacts of the motors throughout the motor’s life-cycle. Environmental aspects include material use, water use when applicable, polluting emissions, waste issues and recyclability. The energy consumption requirements cover minimum efficiency requirements for all kinds of three-phase 2 6 pole AC motors that are sold for direct-on-line operation, and whose rated voltage is less than or equal to 1000 V, and ...

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