Question

Which method is used to reduce eddy current losses in transformers?

Answer 1

To reduce eddy current losses in transformers, the most commonly used method is to laminate the core. Here's how it works:

1. Laminating the Core: The core of a transformer is made up of thin sheets of electrical steel, each insulated from the others. These sheets are called laminations. By using laminations instead of a solid core, the path for the eddy currents is broken up, limiting their flow.
   

1. Why Laminations Work: Eddy currents are circular currents that are induced in the core material due to the changing magnetic field. When the core is solid, these currents flow freely, causing energy loss in the form of heat. Laminating the core creates small gaps between the sheets, which reduces the area through which the eddy currents can circulate, thereby reducing the losses.
   

1. Thin Sheets: The thinner the laminations, the less area the eddy currents have to flow through, and this further reduces their impact. The insulation between the layers prevents direct conduction between the laminations, ensuring that the eddy currents cannot easily flow through the entire core.
   

In summary, lamination of the core is a key technique to reduce eddy current losses in transformers and improve their efficiency.