What Is Eddy Current? - Fixanswer - Get your knowledge fix!

Eddy currents are named so

because the current looks like eddies or whirlpools

. When a conductor is placed in the changing magnetic field, the induced current in the conductor is termed as Eddy currents.

What is eddy current used for?

Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for

flaw detection, material and coating thickness measurements

, material identification and establishing the heat treatment condition of certain materials.

What are eddy currents in simple words?

Eddy currents are currents

which circulate in conductors like swirling eddies in a stream

. They are induced by changing magnetic fields and flow in closed loops, perpendicular to the plane of the magnetic field.

What is difference between eddy current and induced current?

The main difference between eddy current and induced current is that induced current refers to

currents flowing in coils of wire in a closed circuit

whereas eddy current refers to loops of currents flowing within pieces of larger conductors due to electromagnetic induction.

How can we reduce eddy current?

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.

Why is eddy current bad?

Eddy current can

result in the loss of electrical energy in the form of heat

. There will be a magnetic flux leakage in induction coils due to eddy current.

What are the disadvantages of eddy current?

Method restricted to conductive materials.
Inspection of ferromagnetic materials can be impacted by magnetic permeability.
Depth of inspection (penetration) is limited.
Skill and training required is more extensive than other techniques.
Surface finish and roughness may interfere.

What are two uses of eddy current?

Induction furnace (heating effect of eddy current)
Dead-beat galvanometer (electromagnetic damping)
Electric brakes, induction motors,

Is eddy current useful?

Eddy currents. An eddy current is a current set up in a conductor in response to a changing magnetic field. … Because of the tendency of eddy currents to oppose, eddy currents cause a loss of energy. Eddy currents

transform more useful forms of energy

, such as kinetic energy, into heat, which isn’t generally useful.

What is the principle of eddy current test?

Eddy current testing uses the principle of

electromagnetic induction to detect flaws in conductive materials

. An excitation coil carrying current is placed in proximity to the component to be inspected.

What causes an eddy?

Eddies form

when a bend in a surface ocean current lengthens and eventually makes a loop

, which separates from the main current. … These are eddies. In this image, surface water is colored depending on its temperature. Cooler water is shown with blue and purple and orange and yellow show warmer water.

What is mean by eddy current loss?

Eddy current loss is

conductive I2R loss produced by circulating currents induced in response to AC flux linkage, flowing against the internal resistance of the core

.

How do you determine eddy current?

Using your right hand palm rule. Fingers point into the page since magnetic field is into the page, and palm points to the left….so your

thumb points up

. Now eddy currents whirl around in a circle, so imagine the current like a circle. Your thumb pointing up means that the current is going anticlockwise.

How does lamination reduce Eddy currents?

As 4 laminations are stacked together, hence the cross-sectional area of each lamination perpendicular to the magnetic field will become (A/4). Thus, the flux linking through each lamination will be Ø = BA/4. … Thus the

use of thin lamination

reduces the Eddy Current Loss.