Core Cutting

When we look at how JST minimizes noise, reduces losses and realizes high efficiencies we can start by looking at how the transformers core is fabricated. By design, the core geometry uses a step lapped, mitered construction with low loss core steel as the selected material. We use a fully automated, industry-leading equipment, to perform the processes of slitting, stamping, and stacking to produce the transformer core. 

JST’s Core Cutting Process

Starting with the slitting operation, JST utilizes high grade, low loss, core steel supplied directly from the mills. This slitting process cuts the larger rolls of steel, as supplied from the mill, into several smaller rolls with varying strip widths, each spooled for use in fabricating the core laminates.  Strip width and tension are strictly controlled in this advanced slitting process. 

In the stamping process, the rolls of steel with varying strip widths are loaded onto a machine that uses a turret-type feeding system to feed the stamping dies. Each strip width is successively cut into a series of lengths to form the laminates, and this continues until some predetermined number of laminates is reached for each strip width. 

Pictured above is a stamping station where the different strips are cut into the desired shape by a precision stamping die. The finished steel sheets are then moved via a high-speed conveyor system to the stacking station pictured below.

During stacking, the cut laminates are stacked onto automated stacking tables which accepts the cut laminates from the stamping station and automatically places these in a manner that forms the intended core geometry: a round core with step lapped mitered joints.

These processes are all computer-controlled providing an end result being a core with the appropriate geometry and precision to yield optimal performance.