Bobbin

A bobbin is a form that holds wire while an electrical coil is being wound. It is also known as a coil former. The wire is wrapped around the bobbin to create a coil with a set size and shape.

The bobbin provides physical support for the wire. It helps keep the winding in place during production and after the coil is finished. Many bobbins have a center section where the wire is wound. They may also have raised flanges on one or both ends. These flanges help keep the wire inside the winding area.

Some bobbins include pins, terminals, or other features for electrical connections. These parts make it easier to connect the finished coil to other parts of a device.

Bobbin size can affect the finished coil. Important measurements include the inside diameter, outside diameter, width, flange size, and available winding space. These dimensions affect how much wire can fit on the bobbin and how the completed coil fits inside the product.

Bobbin material is also important. Many bobbins used for electrical coils are made from insulating materials. These materials may need to handle heat, electrical stress, and normal forces during use. Unlike a supply spool that only stores wire, a coil bobbin usually remains part of the finished component. It continues to support the winding after production.