What is eddy current in simple words?
Definition of eddy current : an electric current induced by an alternating magnetic field.
What is eddy current and how it is produced?
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 causes eddy current?
Causes of Eddy Currents When a conductor travels through a magnetic field or when the magnetic field around a stationary conductor changes, eddy currents are produced. Eddy currents can thus be generated anytime the intensity or direction of a magnetic field changes in a conductor.
What is eddy current and its uses?
Eddy currents are current loops formed over conductor surfaces due to changing magnetic flux. They are useful in induction heating, levitating, electromagnetic damping, and electromagnetic braking. They can be minimized by adding slots in the conductor surface & laminating. Created by Mahesh Shenoy.
What is eddy current in 12th physics?
Eddy currents are induced currents in the body of conductor when subjected to changing magnetic flux. They are also known as Foucault current after the name of the scientist Foucault. They are known as eddy currents as they are in the pattern of eddiesin the water.
What are eddy currents give two important properties of these currents?
Properties. Eddy currents in conductors of non-zero resistivity generate heat as well as electromagnetic forces. The heat can be used for induction heating. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect.
What are the effects of eddy current?
Thus, eddy currents occur in the stator and rotor cores of electric motors and generators, in transformers, metallic recording heads (used in magnetic recording), and the like. These eddy currents can produce undesirable effects such as power loss, heating, and—in magnetic recording—degradation in performance.
Where are eddy currents used?
Induction furnace. Electromagnetic brakes. Speedometers.
What is eddy current formula?
Next, the eddy current flowing in each ring is obtained by solving a complex matrix equation of the form [X] [I] = [V] where X is the impedance matrix, I is the eddy current matrix, and V is the induced voltage matrix.
How can eddy current be avoided?
How to minimize the eddy current?
- The resistance of the core should be increased.
- In transformers, the thin sheets of steel in the core should be insulated from each other by a thin layer of varnish.
- As the laminations are thin, they will have relatively high resistance.
What are the advantages of eddy currents?
The two advantages of eddy current in practical applications are: Sensitivity to surface defects: Able to detect defects of 0.5mm in length under favourable conditions. Accurate conductivity measurements: Dedicated conductivity measurement instruments operate using eddy currents.
Why do eddy current losses occur?
Eddy current losses are the result of Farady’s law, which states that, “Any change in the environment of a coil of wire will cause a voltage to be induced in the coil, regardless of how the magnetic change is produced.” Thus, when a motor core is rotated in a magnetic field, a voltage, or EMF, is induced in the coils.