First slide

Electrical machines and devices

Question

We can reduce eddy currents in the core of transformer

Moderate

A

By increasing the number of turns in secondary coil
B

By taking laminated core
C

By making step-down transformer
D

By using a weak ac at high potential

Solution

Eddy current magnitude can be reduced by designing the core as a set of thin sheets or laminations, in parallel to the magnetic field. Each sheet must be insulated from its neighbours with a thin coating of varnish or oxide film. By laminating the core, the area of each section and hence the induced EMF is reduced

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