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ERC

ALEM Report Summary

Project ID: 339380
Funded under: FP7-IDEAS-ERC
Country: Finland

Periodic Report Summary 2 - ALEM (ADDITIONAL LOSSES IN ELECTRICAL MACHINES)

There are more losses in electrical machines than the conventional methods of analysis predict. Typically these additional losses are about one percentage of the input power. We search for the physical reasons for these additional losses. When the sources of the additional losses are known, we try to model them with numerical models. Finally, our aim is to optimize the electrical machine taking these additional losses into account.

Random variation exists in some production processes of electrical machines that cause variation in their losses. For instance, the positions of galvanic interlamination contacts and strands in stator windings vary randomly and the condition of the punching tools causes variation in the material properties of electrical steel sheets at the cutting edge. Methods of conventional and stochastic finite element analysis have been developed to tackle these problems.

Electrical steel sheets used for the cores of electrical machine exhibit strong magneto-mechanical coupling. The residual stresses and strains caused in the production of the machine affect the losses. Magneto-mechanical constitutive equations for soft magnetic materials have been developed based on the latest theories on electromagnetic interaction with matter. New approaches have been developed to account for the hysteresis losses in the magneto-mechanical constitutive laws under stresses. Simulation studies on the cutting process of electrical steel sheets have been done to estimate the residual stresses and strains for the loss models.

Reported by

AALTO-KORKEAKOULUSAATIO
Finland
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