The Duo Core (DUO) is a combination of several core faces. It is built up as a series of laminations with overlapping cuts along both core legs. Although there are two cuts it is a true End Overlap type core with all of the advantages that this offers. The cut faces diverge to produce a distributed gap with no two cut faces sitting adjacent to each other between lamination stacks. The core is made in two mating halves which are not identical and hence cannot be reversed; each half is made separately for ease of manufacturing. The corners are set at 45 degrees and the inner corner radius is adjustable.

Other options include

Selectable C or E (Evans) core style, insertion helpers, full size inner lamination, overlap start position number of overlaps, number of laminations per overlap and an outer TIG lamination. The Evans cores have a gap programmed between the inner cores. This core has been designed to use wedges between the core and bobbin during assembly. The minimum window length is 80 mm and width is 40 mm.

Applications

• Single phase core type and three phase (Evans style) transformers.
• The Duo core can also be used in shell type applications, but attention must be given to fixingor clamping of the leg not inside the bobbin.