Transformer Core Loss Calculator

Transformer core loss is the power wasted as heat in the magnetic core during AC operation — a critical factor in transformer efficiency and thermal design. The Transformer Core Loss Calculator uses the Steinmetz equation to break down losses by their physical cause. Enter your Maximum Flux Density (Bmax), Operating Frequency, core geometry (Effective Core Area, Effective Path Length, Stack Height), and Core Material Type with its loss coefficients to get Total Core Loss, split into Hysteresis Loss and Eddy Current Loss, plus Loss Density (W/kg) and Core Volume.

T

Peak magnetic flux density in Tesla

Hz

AC frequency in Hertz

cm²

Cross-sectional area of the magnetic core

cm

Mean magnetic path length

cm

Height of the laminated core stack

Material-specific hysteresis loss coefficient

Material-specific eddy current loss coefficient

mm

Thickness of individual laminations

Results

Total Core Loss

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Hysteresis Loss

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Eddy Current Loss

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Loss Density

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Core Volume

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Frequently Asked Questions

What is the difference between hysteresis and eddy current losses?

Hysteresis losses occur due to the cyclic magnetization and demagnetization of the core material, proportional to frequency. Eddy current losses are caused by circulating currents induced in the conductive core material, proportional to the square of frequency.

How does lamination thickness affect core losses?

Thinner laminations reduce eddy current losses by limiting the path for circulating currents. However, thinner laminations increase manufacturing costs and may require more insulation material.

What is the typical range for maximum flux density in transformers?

For power transformers, Bmax typically ranges from 1.0 to 1.8 Tesla. Higher flux densities allow smaller cores but increase losses and may lead to saturation.

How do I determine the hysteresis and eddy current coefficients?

These coefficients are material-specific and usually provided by the core material manufacturer. They can also be determined experimentally through loss measurements at different frequencies and flux densities.

Why are transformer cores laminated?

Lamination breaks up the eddy current paths, significantly reducing eddy current losses. Each thin lamination is insulated from adjacent ones to prevent current flow between layers.

How does operating frequency affect core losses?

Hysteresis losses increase linearly with frequency, while eddy current losses increase with the square of frequency. At higher frequencies, eddy current losses become dominant.

What factors determine the effective core area and path length?

Effective core area is the cross-sectional area of the magnetic path, while effective path length is the average length of the magnetic flux path through the core. These depend on the core geometry and design.