Efficiency improvement of rotating electrical machines

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Dr. Vajda István
Department of Electric Power Engineering

In 2008 a new family of standards has been introduced in the European Union regarding the energy efficiency of rotating electrical machines, unifying their specifications. Paragraph no. 30 defines the efficiency classes and lists the mandatory nominal efficiency for given rates of performance.

Thus, every manufacturing corporation selling for the European market has to revise their products and implement the possibly required changes.

In the first part of my thesis I will give a detailed description of these standards, mainly focusing on paragraph no. 30.

The family of standards is updated and expanding continuously, becoming more detailed and stringent.

The main section of my thesis discusses the possibilities of the efficiency enhancement of induction machines.

The investigation is based only on electrical parameters, the approach from mechanical and driving perspective is not considered in this document.

The subjects of the investigation are the results of changes made in the winding, the iron stack length, and by the better iron material selection and the modification of lamination geometry.

The advantages, disadvantages, risks and possibilities of different methods are also investigated by SWOT analysis.

I had the opportunity to participate in the production and after that the measurement of a 4 pole, 370W drive at Grundfos Magyarország Gyártó Kft. There had been two prototypes produced and the second one reached and passed the level of IE3 already.

The last section of my diploma thesis is focused on a self-made efficiency optimization excel macro. This macro invokes a design software called Speed motor, which provides the mathematical model and delivers the optimum design. The program is also capable of iteration.

The main input parameters are the iron stack length, the winding turns and copper wire diameter.


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