Eddy Current
Circulating currents induced in conductive materials by changing magnetic fields, causing energy losses in transformers.
Eddy currents are circulating currents induced in conductive materials by changing magnetic fields. Occur in core laminations, windings, structural parts.
Core losses proportional to lamination thickness squared, frequency, flux density. Thin laminations (0.23-0.35mm) interrupt paths. Combined with hysteresis loss = total core loss.
In structural parts, cause stray losses contributing to load loss. Minimized through shielding.
QDTB minimizes losses through optimized step-lap core construction, thin laminations, and structural shielding.
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Related Terms
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
Hysteresis Loss
Energy lost in core steel from repeated reversal of magnetic domains each AC cycle, a component of core loss.
More Terms Starting with “E”
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
EMF (Electromotive Force)
The voltage generated by electromagnetic induction in a transformer winding, proportional to flux change and turns.
Excitation Current
Current drawn by transformer primary when energized with no load, consisting of magnetizing and core-loss components.
EV Charging Transformer
A transformer for EV charging stations handling harmonic-rich loads and variable power demands.
More in “Electrical Fundamentals”
Apparent Power (kVA)
The total power in an AC circuit combining real (active) and reactive power, measured in kilovolt-amperes (kVA).
EMF (Electromotive Force)
The voltage generated by electromagnetic induction in a transformer winding, proportional to flux change and turns.
Excitation Current
Current drawn by transformer primary when energized with no load, consisting of magnetizing and core-loss components.
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