US 8,943,677 B2 · Method for joining core laminations by adhesive force to form a soft-magnetic laminated core

Abstract

A method for joining core laminations by adhesive force to form a soft-magnetic laminated core by applying a coating that is wettable with epoxy resin to top sides and undersides of each sheet. The sheets are separated into core laminations made of soft-magnetic sheets, which are stacked to form a core lamination stack, and a cured adhesive introduced in a state of low viscosity into interstices between the core laminations. The core lamination stack has intermediate layers between the core laminations. For this purpose, the core laminations comprise a final-annealed, crystalline CoFe alloy, an adhesive-wettable top side and an adhesive-wettable underside. Together with the intermediate layers, the core laminations form a dimensionally accurate laminated core. The laminated core has a substantially adhesive-free contour consisting of contour surfaces of the core laminations. The adhesive is solvent-free in its low-viscosity state.

Claims58

Dependent claims

A method for joining core laminations to form a soft-magnetic laminated core, comprising:

producing sheets of a soft-magnetic, crystalline CoFe material, each sheet having a top side and an underside;
applying a coating that is wettable with epoxy resin to the top sides and undersides of each sheet;
separating said sheets into core laminations having a wettable coating on the top sides and undersides and having less wettable contour surfaces;
stacking the core laminations to form a core lamination stack, comprising stacking each core lamination on top of another core lamination without warping and in a plane parallel manner, and wherein said introducing of said solvent-free, low-viscosity adhesive between the core laminations comprises filling an epoxy-based solvent-free adhesive of low viscosity into the interstices between the core laminations of the core lamination stack from an end face of the core lamination stack by means of capillary action;
and
joining the core lamination stack by adhesive force to produce a soft-magnetic laminated core by introducing a solvent-free, low-viscosity adhesive between the core laminations in the core lamination stack, and curing the adhesive to produce electrically insulating intermediate layers between sheets of soft-magnetic material.

3 more elements

Dependencies are inferred from the claim text.

Method for joining core laminations by adhesive force to form a soft-magnetic laminated core

Life of this patent

Method for joining core laminations by adhesive force to form a soft-magnetic laminated core

Life of this patent

Abstract

Claims58