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What exactly is eddy current?
Definition of technological terms Chinese name: Vortex flow English name: Vortex flow; Eddy current Other names: Convolutional flow Definition 1: A flow in which the particle velocity forms a small mass that rotates, i.e. the angular velocity is not equal to zero. Discipline: Geography (first level discipline); Definition 2 of Hydrology (Secondary Discipline): Induced current in a material circulating along a closed path. Discipline: Electric Power (First Level Discipline); Definition 3 of General Theory (Secondary Discipline): Vortex currents induced in a conductor due to changes in the time or space (or both) of the magnetic field. Discipline: Mechanical Engineering (First Level Discipline); Testing machine (second level discipline); Non destructive testing instrument - Magnetic particle testing machine (Level 3 discipline) Definition 4: Fluid micro clusters have rotating flow. Discipline: Water Conservancy Technology (First level Discipline); Hydraulics, River Dynamics, Coastal Dynamics (Secondary Disciplines); Hydraulics (Water Conservancy) (Third Level Discipline) This content has been approved and published by the National Science and Technology Terminology Review Committee. When the current in a coil changes over time, electromagnetic induction will generate induced current in another nearby coil. In fact, any conductor near this coil will generate induced current. If we use a graph to represent such induced current, it looks like a vortex in water, so we call it eddy current induced. The principle of eddy current phenomenon in the catalog is eddy current loss, eddy current detection and other editing. Eddy current phenomenon is shown in Figure 4.7-1. When a coil is wound around a conductor and an alternating current is applied to the coil, the coil generates an alternating magnetic field. Due to the fact that the conductor in the middle of the coil can be equivalent to a closed circuit in the circumferential direction, the magnetic flux in the closed circuit is constantly changing. Therefore, induced electromotive force and induced current are generated in the circumferential direction of the conductor. The direction of the current rotates along the circumferential direction of the conductor, like a vortex in a circle. Therefore, this phenomenon of electromagnetic induction inside the entire conductor to generate induced current is called eddy current phenomenon. The longer the outer circumference of the conductor, the higher the frequency of the alternating magnetic field, and the greater the eddy current. Eddy currents inside conductors can also generate heat. If the resistivity of the conductor is low, the eddy currents are strong and the heat generated is significant. The principle of this paragraph is the current induced inside a conductor by electromagnetic induction. Also known as Foucault current. A conductor moving in a magnetic field, or a conductor stationary but with a time-varying magnetic field, or both situations occurring simultaneously, can cause relative cutting between magnetic field lines and the conductor. According to the law of electromagnetic induction, an induced electromotive force is generated in a conductor, which drives current. The distribution of current caused in this way in the conductor varies with the surface shape of the conductor and the distribution of magnetic flux, and its path often resembles a vortex in water, hence it is called eddy current. Edd