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Transformer core is laminated to reduce
Hysteresis loss
Eddy current loss
Copper loss
All of the above
Eddy current loss
Transformer cores are laminated to reduce eddy current losses. Lamination involves using thin sheets of silicon steel insulated from each other, which restricts the path of circulating eddy currents.
Transformer cores are laminated to reduce eddy current losses. Lamination involves using thin sheets of silicon steel insulated from each other, which restricts the path of circulating eddy currents.
PeтАЛ=KeтАЛBm2тАЛf2t2V тАФ formula for eddy current loss
PhтАЛ=KhтАЛBm1.6тАЛfV тАФ formula for hysteresis loss
According to Faraday's law, a time-varying magnetic flux induces an EMF in the core material. Because the core is a conductor, this EMF drives eddy currents that cause I2R power loss and heating. By laminating the core into thin layers and insulating them with varnish, the electrical resistance of the eddy current paths is significantly increased, thereby reducing the current magnitude.
Eddy current loss is directly proportional to the square of the lamination thickness (t2).
Silicon steel is used for the core to also minimize hysteresis loss.
Laminations are insulated using thin varnish or oxide layers.
The core is oriented parallel to the magnetic flux to minimize reluctance.
Increased transformer efficiency
Reduced operating temperature
Increased manufacturing cost
Slightly increased volume and weight of the core
Power transformers
Distribution transformers
Inductors and Chokes
Silicon steel is typically used to ensure low hysteresis loss and high permeability.
Option A (Hysteresis loss) is reduced by using high-grade silicon steel, not lamination.
Option C (Copper loss) is reduced by increasing the cross-sectional area of the conductor windings.
B is correct тАФ Lamination breaks the conducting path of eddy currents, significantly reducing the I2R losses induced within the magnetic core.
Always remember that lamination targets eddy currents, while material selection (Silicon Steel) targets hysteresis losses.