Metodutveckling av transformatorlindning

Sammanfattning: During the winding process of transformers, ABB in Ludvika uses wood spacers built as stairs which are carefully cut to the proper proportions with slight changes in length and height in x- respectively y -direction. The use of a staircase model is because the windings are made in layers instead of a helix structure around the iron-core. The copper wire comes in many different sizes and are each wired a different number of layers which makes the stair-steps in an infinite number of combinations. The wire is wired up to fill each step before it elevates to the next level. This layer by layer structure is a more effective way of conducting a high intensity magnetic field, which is a transformer’s primarily task. Although this process is working fine, the use of wood spacers is a primitive tool in today’s standards and the process requires a series of never-ending changes, which has led to the conclusion that a more adjustable pallet tray is required to shorten the lead time. A series of interviews with the workers of the transformers were conducted. From the information given a couple of concepts were constructed. From a LEGO inspired product to a flexible spacer with the same technology as a wrench. This last concept was chosen to be the most prominent candidate. The stair was elaborated in CAD to later be 3D-printed and assembled for a physical model, which were later presented to ABB in Ludvika.