Magnetic core and use of magnetic core for electrical machines

Abstract

A magnetic core is described comprising a stack of electrical steel sheets with a known preferential direction of permeability. In the stack the preferential direction of permeability of successive single sheets and in addition or alternatively of successive groups of sheets differs by a predetermined shift angle. Further the use of a magnetic core is described.

Description

Magnetic cores and their use in motors technical field The present invention relates to a magnetic core comprising a stack of electrical steel sheets having a known preferred direction of permeability. Also, a technique for manufacturing a magnetic core including a grain-oriented sheet in order to improve energy efficiency of an AC motor whose core is in a variable magnetic field is disclosed. Background technique Various electrical machines generally include a magnetic core (hereinafter "MC") made essentially of electrical steel. Of course, basically the properties of the electrical steel that makes up the core affect the various properties of the motor. In particular, grain oriented electrical steel can be used for the magnetic core. The microstructure of grain-oriented electrical steel (hereinafter referred to as “GO”) shown in Fig. 1(a) shows these grains with their <001> orientation parallel to the rolling direction (hereinafter referred to as “RD”) Aligned,...

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Problems solved by technology

The energy efficiency of the motor will decrease overall as the energy dissipation due to losses increases

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