What is the purpose of laminating the transformer core?

• A. To Decrease Weight
• B. To Reduce Eddy Currents
• C. To Improve Heat Conduction
• D. To Increase Magnetic Leakage

Answer: (B)

Laminating the transformer core mainly aims to cut down eddy currents. When the core is exposed to the changing magnetic field of AC operation, circulating currents would flow in loops inside a solid piece of metal, wasting power as heat. By using many thin sheets of insulated steel stacked together, those current paths become tiny and stay confined within each sheet, thanks to the insulating layer between laminations. This dramatically increases the resistance to those currents and reduces their magnitude, so less energy is lost as heat and the transformer runs cooler and more efficiently. The lamination also helps with material choice (silicon steel) and thickness sizing to optimize loss reduction for the operating frequency. It doesn’t primarily change weight or heat conduction, and its main benefit is minimizing eddy-current losses.