Question

The transformer core is laminated in order to

• A. minimize eddy current loss
• B. reduce copper loss
• C. reduce cost
• D. reduce hysteresis loss

Hint:

Different losses have different fixes:
Eddy current loss $\rightarrow$ Lamination
Hysteresis loss $\rightarrow$ Using soft iron core
Copper loss $\rightarrow$ Using thick wires

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A transformer core is subjected to a varying magnetic field, which induces currents within the bulk of the core material. These are called eddy currents.

Step 2: Detailed Explanation:
Eddy currents flow in circular loops within the conductor and cause significant energy loss in the form of heat (Joule heating).
1. To reduce this, the core is not made of a single solid block but of many thin sheets (laminations) insulated from each other.
2. These laminations break the large circular paths of eddy currents into much smaller ones, increasing the effective resistance and drastically reducing the magnitude of the currents.
3. This process minimizes the energy lost as heat due to eddy currents.

Step 3: Final Answer:
Lamination is done to minimize eddy current loss.