What is a key purpose of toroid cores in transformers?

The key purpose of toroid cores in transformers is to concentrate magnetic flux. Toroidal transformers utilize a donut-shaped core made from a magnetic material, allowing the magnetic field generated by the winding to closely follow the path of the core. This design maximizes magnetic coupling between the primary and secondary windings, resulting in improved efficiency and performance of the transformer.

When the magnetic core effectively contains and directs the magnetic flux, it minimizes losses that can occur due to leakage. By concentrating the magnetic flux, toroidal cores can produce higher induction and support greater power transfer in a more compact form than traditional laminated cores, enhancing the overall effectiveness of the transformer in electrical applications.