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As we all know, when converting electrical energy, we always rely on devices like transformers and adapters. But how are these components actually made? Let's break it down.

The transformer bobbin, also known as the coil former or frame, is the main structural component of a transformer.

Here is the full description:

act on ：

Provide winding space: Provides space for the copper wire in the transformer to wind, ensuring the winding can be arranged orderly, enabling the transformer to achieve normal electromagnetic conversion function.

Fixed magnetic core: The magnetic core of the transformer is fixed in the appropriate position to ensure the integrity and stability of the magnetic circuit, and to prevent the magnetic core from displacement during the operation of the transformer.

The designed wire routing path: The wire grooves in the bobbin provide the path for the transformer to wind the wire, so that the copper wire can be wound on the bobbin accurately according to the design requirements.

Electrical connection implementation: The metal pins in the bobbin act as support pillars for the transformer's copper wire winding. After soldering, they connect to the PCB board, enabling electrical conduction during transformer operation and establishing the electrical link between the transformer and external circuits.Such as，Motorcycle drive power supply PQ20 transformer bobbin.

Determine the installation direction and pin sequence: The protrusions, recesses, or chamfers on the bobbin determine the transformer's placement direction or pin sequence during use, ensuring proper installation on the circuit board.

classify ：

Magnetic core models include EI, EE, EF, EPC, ER, RM, PQ,PM and UU, with each type further classified by core size (e.g., EE5, EE8, EE13).

By shape: it can be divided into vertical and horizontal.For example, the EF20 LED lighting driver transformer bobbin.

According to the working frequency, it is divided into high-frequency bobbin and low-frequency bobbin. The high-frequency bobbin is suitable for transformers with high working frequency, while the low-frequency bobbin is suitable for transformers with low working frequency.

Pin types are classified as DIP (Direct Insert Pin) and SMD (Surface Mount Device) for their application: DIP pins are inserted into circuit board sockets, while SMD components are surface-mounted and soldered directly onto the board.Take the EE10 notebook computer power switch transformer bobbin as a reference.

Materials: High-strength insulating materials such as epoxy resin and polyimide are typically used. These materials not only provide excellent mechanical strength to withstand the weight of windings and electromagnetic forces, but also offer superior insulation properties to effectively prevent current leakage and short circuits.

The production process typically involves mold design and manufacturing, injection molding, and burr removal. Mold design must meet customer specifications by considering dimensions, structure, and demolding requirements. Injection molding involves injecting molten material into the mold cavity and allowing it to solidify upon cooling. Burr removal specifically targets bakelite-type bobbins to eliminate surface defects formed during the molding process.

Choosing a transformer bobbin based on specific application requirements is paramount. So, do you now have a deeper understanding of transformer bobbins? If you have any product-related questions, please feel free to contact us at any time.

Email: sales008@mycoiltech.com

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Name：Alex~Mycoiltech