Patent ID: 8941373
Filing Date: 2015-01-27
Classification: G01R

Abstract:
1. A current sensor comprising: a primary conductor for conducting a current that is to be measured, at least two magnetic field probes for measuring magnetic fields, and a magnetic core, which has a closed, ring structure having three or more corners that encloses the primary conductor, and which has at least two legs formed from soft-magnetic material, which are joined to one another by formed on their ends, wherein each magnetic field probe is arranged on the magnetic core or in recesses in the magnetic core; wherein each leg comprises a sheet-metal stack that consists of stacked soft-magnetic pieces of sheet-metal, wherein for each leg, a first part of the piece of sheet-metal is arranged to project relative to the joint and a second part is arranged shifted to the rear relative to the joint, wherein for the other leg forming the joint the pieces of sheet-metal overlap those of the other leg at the joint, and wherein the joints form air gaps, and wherein the at least two magnetic field probes adjoin the overlaps for measuring the magnetic fields in the air gaps.