The role and wide range of uses of transformer skeletons

Transformer skeleton - or transformer wire frame, collectively known as Bobbin, is the main structural component of the transformer. Transformers are widely used in today's society, and the corresponding subject is also indispensable, so the current skeleton has an irreplaceable role. The main roles in transformers are as follows:

1. Provide space for winding the copper wire in the transformer,

2. Fix the core in the transformer.

3. The wire duct in the skeleton provides a path for the transformer to pass through the wire when winding the production line.

4. The metal stitches in the skeleton are the pillars of the copper wire winding of the transformer; After soldering, it is connected to the PCB board and plays a conductive role when the transformer is working.

5. The baffle at the bottom of the skeleton can make the transformer and PCB board have a fixed effect; It provides a certain distance space for the tin stack and PCB board generated during soldering, and the magnetic core and PCB board. Isolate the magnetic core and the tin pile to avoid poor pressure resistance.

6. The bumps, concave points or chamfers in the skeleton can determine the placement direction or pin order when the transformer is used.

Transformer skeleton – classification

The skeleton is generally classified according to the magnetic core (or iron core) model used in the transformer, including EI, EE, EF, EPC, ER, RM, PQ, UU and other models, and each model can be distinguished according to the size of the magnetic core (or core), such as EE5, EE8, EE13, EE19 and other models of different sizes. The skeleton is divided into two types: vertical and horizontal according to shape; According to the working frequency of the transformer, it is divided into two types: high-frequency skeleton and low-frequency skeleton, the frequency mentioned here does not refer to the number of times it is used, but refers to the number of periodic changes of the transformer during operation, the unit is Hertz (Hz), referred to as Hertz, and is also commonly used as a unit of kilohertz (kHz) or megahertz (MHz) or GHz; According to the stitch use nature of the skeleton, it is divided into two types: traditional skeleton (DIP) and patch skeleton (SMD). Transformer skeleton - additional information It is precisely because of so many features that the shape of the skeleton can be described as ever-changing. As far as the same skeleton is concerned, for example, the skeleton of the EE-19 vertical inline bakelite, after such a detailed classification, there are at least a dozen types of skeletons. Some have different retaining wall heights, some have different winding groove sizes, even the most important and critical dimensions, PIN spacing and row spacing, are different. In this way, it has caused many difficulties for both the supply and demand of the skeleton. If the size is slightly different, the existing mold cannot be used. To put it simply, it is necessary to cooperate with a certain part of the newly opened mold, and the whole set of molds for complex points must be reopened. It has greatly increased the production cost of transformers, and in the industry, because of the inability to find suitable molds, transformer factories are unable to receive orders repeatedly. Many friends in transformer factories have a consensus that among all transformer components, the skeleton is the most difficult to find.