BOBBIN refers to the skeleton, also known as transformer skeleton, or transformer wire frame, collectively referred to as Bobbin in English, which is the main structural component of a transformer. Transformers are widely used in today's society, and their corresponding subjects are also essential, so the skeleton plays an irreplaceable role.
1. What is a transformer skeleton
The skeleton is generally classified according to the type of magnetic core (or iron core) used in the transformer, including EI, EE, EF, EPC, ER, RM, PQ, UU, and other models. Each model can be distinguished by the size of the magnetic core (or iron core), such as EE5, EE8, EE13, EE19 and other models with different sizes. The skeleton can be divided into two types according to its shape: vertical and horizontal; According to the working frequency of transformers, they can be 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 rather the number of times the transformer undergoes periodic changes during operation. The unit is Hertz (Hz), abbreviated as Hertz, which is also commonly used in kilohertz (kHz), megahertz (MHz), or GHz; According to the nature of the needle usage of the skeleton, it can be further divided into two types: direct insertion skeleton (DIP) and SMD skeleton.
1. What is a transformer skeleton
(Image from the internet)
2. Transformer skeleton classification
1. Divided by phase number:
1) Single phase transformer: used for single-phase loads and three-phase transformer groups. 2) Three phase transformer: used for raising and lowering voltage in three-phase systems.
2. Classified by cooling method:
1) Dry type transformer: It relies on air convection for cooling and is generally used for small capacity transformers such as local lighting and electronic circuits.
2) Oil immersed transformer: It relies on oil as the cooling medium, such as oil immersed self cooling, oil immersed air cooling, oil immersed water cooling, forced oil circulation, etc.
3. Classified by purpose:
1) Power transformer framework: used for voltage rise and drop in transmission and distribution systems.
2) Instrument transformers: such as voltage transformers, current transformers, measuring instruments, and relay protection devices.
3) Test transformer: capable of generating high voltage and conducting high voltage tests on electrical equipment.
4) Special transformers: such as furnace transformers, rectifier transformers, adjustment transformers, etc.
4. Classified by winding form:
1) Dual winding transformer: used to connect two voltage levels in the power system.
2) Three winding transformer: generally used in power system regional substations, connecting three voltage levels.
3) Autotransformer: used to connect power systems with different voltages. It can also be used as a regular step-up or step-down transformer.
5. According to the form of iron core:
1) Core transformer framework: used for high-voltage power transformers.
2) Shell type transformer: used for special transformers with high current, such as furnace transformers and welding transformers; Or power transformers for electronic instruments, televisions, radios, etc.
3. Transformer skeleton function
The main functions of the skeleton in transformers are as follows:
1. Provide space for winding the copper wires in the transformer,
2. Fix the magnetic core in the transformer.
3. The wire slot in the skeleton provides a path for the winding of the transformer during production.
4. The metal pins in the skeleton are the pillars wrapped with copper wires of the transformer; After soldering, it is connected to the PCB board and plays a conductive role in the operation of the transformer.
5. The convex, concave, or chamfered points in the skeleton can determine the placement direction or pin order of the transformer during use.