What Is a Vortex?

Eddy Current (also known as Foucault current [1]) was discovered by French physicist Leon Foucault in 1851. It is because a moving magnetic field intersects with a metal conductor, or is caused by a moving metal conductor intersecting a magnetic field perpendicularly. In short, it is caused by the electromagnetic induction effect. This action generates a current circulating in the conductor.

As shown on the right

Foucault current

Energy loss due to eddy currents when a conductor moves in a non-uniform magnetic field or in a magnetic field that changes over time. Eddy currents are the currents induced in a conductor under the conditions described above. This current forms a closed current line in the conductor, which is called eddy current (also known as Foucault current).

2. Generate eddy current

Eddy currents are also generated in conductors placed in a magnetic field that changes over time, such as the core of a transformer, which has a magnetic flux that changes with time. It generates an induced electromotive force on the secondary side and an induced electromotive force in the core. vortex. These eddy currents heat the core and consume electrical energy, which is undesirable. However, in an induction heating device, a metal workpiece can be heat-treated by using eddy current.

3. Eddy current suppression

Large conductors that move in a magnetic field or are in a changing magnetic field must generate induced electromotive forces, form eddy currents, and cause large eddy current losses. In order to reduce eddy current loss, the core is often

In fluid mechanics and hydraulics, eddy current means that at least one of the rotational angular velocity vectors of a fluid is not zero, and is also called a swirling flow, that is, a fluid particle or a fluid micelle rotates around its own axis during the movement. Generally, when a vortex is generated, there will be another corresponding vortex. This is one of the reasons that the aircraft generally fly in the professional academia.