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Metal Separator Working Principle
Apr 12, 2018

Metal separators use the principle of electromagnetic induction to detect metals. All metals including iron and non-ferrous metals have high detection sensitivity. Ferromagnetic metal entering the detection area will affect the magnetic field distribution of the detection area, and then affect the fixed range of magnetic flux. Non-ferromagnetic metal entering the detection area will generate eddy current effects, and will also change the distribution of the magnetic field in the detection area. Usually, the metal separator consists of two parts, namely a metal separator and an automatic rejection device, in which the detector is the core part. There are three groups of coils distributed inside the detector, namely the central transmitting coil and two equal receiving coils. The oscillator connected by the transmitting coil in the middle generates a high-frequency variable magnetic field, and the induced voltage of the receiving coils on both sides in the idle state. Before the magnetic field is disturbed, they cancel each other and reach an equilibrium state. Once metallic impurities enter the magnetic field, the magnetic field is disturbed, the balance is broken, the induced voltages of the two receiving coils cannot be cancelled, and the unsuppressed induced voltage is amplified by the control system and generates an alarm signal (metal impurities are detected. ). The system can use this alarm signal to drive automatic reject devices and the like to remove metal impurities from the production line.

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