Winding, in the context of lighting, consists of coiling a conductive wire (generally copper) around a magnetic core to form a coil. This action, called winding, is an essential element of many electrical components used in lighting systems, such as transformers, ballasts, and inductors.

Winding plays a crucial role in the management of electrical energy in a light fixture. It allows:

• Voltage transformation: Transformers, composed of windings, step down or step up the electrical voltage to adapt to the needs of different lamps.
• Current limitation: Inductors, also composed of windings, limit the intensity of the electrical current, thereby protecting electronic components.
• Creating magnetic fields: These magnetic fields are used to generate light in certain lamps (discharge lamps).

Different types of windings are found in the lighting industry:

• Primary and secondary windings: In transformers, the primary winding receives the electrical energy and the secondary winding delivers it at a different voltage.
• High-frequency windings: Used in switching power supplies for LEDs, they operate at high frequencies to reduce the size of components.
• Filtering windings: They serve to filter harmonics and interference present in the electrical current.

The manufacturing of coils requires great precision and specific know-how. The main challenges are:

• Winding quality: Irregular winding can degrade the performance of the coil.
• Joule effect losses: The electrical resistance of the wire generates energy losses in the form of heat.
• Stray magnetic fields: These fields can interfere with the operation of other components.

To guarantee the quality of a winding, it is essential to:

• Use high-quality materials.
• Comply with dimensional tolerances.
• Carry out rigorous quality controls.
• Optimize the winding design.

In addition to these factors, it is also important to choose the right winding process. There are different types of machines and methods for carrying out winding, each with its own advantages and limitations.

The most commonly used method is continuous or series winding. This method consists of continuously winding the wire around the core until the desired number of turns is reached. This allows for a very regular and precise winding, but it can be a fairly slow process.

Another common method is layer winding.