Proximity effect - current in same direction

Autor/Urheber:

Chetvorno

Shortlink:

https://dewiki.de/b/371de8

Quelle:

Wikimedia Commons

Größe:

987 x 817 Pixel (33267 Bytes)

Beschreibung:

Diagram of two adjacent wires carrying an alternating (AC) electric current (I, red arrows) in the same direction, showing the origin of proximity effect. Proximity effect is a redistribution of current in a AC current-carrying conductor, due to currents induced by the time varying magnetic field of an adjacent conductor from Faraday's law of induction. In parallel wires carrying current in the same direction it causes the current to concentrate on the far side of the conductor, away from the neighboring conductor. It is caused by the magnetic field (B, green arrows) of the adjacent wire.

The drawing shows the currents and magnetic field at a point in the AC cycle when the current is increasing. The time varying magnetic field from the lefthand wire passes through the righthand wire, creating circular eddy currents (E) in the wire. During the part of the AC cycle when the current is increasing the eddy currents circle in a clockwise direction as shown, increasing the current density on the right side of the wire (2) and decreasing the density on the left side (1). The resulting current density profile is shown by the red arrows, and color gradient on the cross section of the wire (3), with blue indicating lower current density, and green, yellow, and red progressively greater current density. During the other half of the cycle while the current is decreasing, the eddy currents are in a counterclockwise direction, reversing the current.

The current distribution illustrated by the color gradient is just a hand-drawn approximation, not an exact calculation of the current density.

Lizenz:

CC0

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