laminated iron(steel) core : 적층 철(강철) 코어

[석수]

'적층철'은 산업 현장이나 전기·전자 부품(예: 변압기, 모터 등)에서 얇은 철판을 여러 겹으로 쌓아 만든 것을 뜻하며, 한자로는 積層鐵이라고 씁니다.

積 (쌓을 적): 쌓다
層 (층 층): 층
鐵 (쇠 철): 쇠 (또는 철)

'층층이 쌓은 쇠(철)'라는 뜻

A laminated iron core is an assembly of thin electrical-grade steel sheets (laminations) stacked together to form the magnetic core in transformers, motors, and inductors.

https://youtu.be/ir2WyQ9NEs4?si=Mi0anNre5aC3m4XO

Each sheet is coated with an insulating varnish or oxide to prevent electrical contact with adjacent sheets.


https://youtu.be/3XBRO4Mo1fI?si=oeKATU2RBiqrnLLi

Why Laminated Cores?

In devices powered by alternating current (AC), changing magnetic fields induce unwanted swirling currents within the metal core, known as eddy currents. Because these currents flow through a resistive material, they generate excessive heat and waste energy.

Stacking thin, insulated laminations effectively cuts off the physical pathways for these eddy currents to circulate. Because the current paths are forced to be narrow, energy losses and heat generation are drastically reduced, dramatically increasing the device's efficiency and lifespan.

Key Benefits

Reduced Eddy Currents: Limits current flow to the thickness of a single sheet.Lower Hysteresis Loss: Uses specialized silicon steel that requires less energy to magnetize and demagnetize.

Minimized Heat: Less energy is wasted as heat, protecting delicate coil windings from thermal damage.


Typical ApplicationsTransformers: Used in power distribution grids and electronic equipment to efficiently step voltage up or down.

Electric Motors: Prevents core losses in the stators and rotors of AC motors.

Inductors / Chokes: Helps smooth out pulsating currents in power supplies and audio equipment.

For a clear visual breakdown of how eddy currents form in solid blocks vs. laminated sheets:


https://youtu.be/HkI4sKfwcFU?si=SaupsoOFIBxeCqPZ