Why do toroidal cores have to have corner radius?
The angular radius of a toroidal core is very important because, if the core has sharp edges, it can scratch the insulation of the wire during a delicate winding operation. In order to ensure that the toroidal core has a certain corner radius, POCO has done a lot of work. The ferrite ring core press dies produced have a built-in radius, and the sharp edges and corners of the core are also ground off. One side of the core has a corner radius, and the other side is smooth. In addition, many cores that are painted or coated not only have a blunt angular radius, but also have a smoother winding surface. Like ferrite, the coating provides additional edge coverage.
