What is an eddy current separator and how does it work?

What is an eddy current separator and how does it work?

An eddy current separator (ECS) is a machine that uses a powerful magnetic field to separate non-ferrous metals from an input waste or ore stream. The device makes use of eddy currents to effect the separation. Non-ferrous metals typically separated by an ECS include aluminum, copper and die-cast metals.

What is eddy current examples?

Popular equipment such as stationary exercise bikes are a great example of eddy currents in action. Programming the bike to simulate an uphill climb increases the drag between the non-magnetic conductor and the permanent magnet in the bike making it more difficult to keep peddling.

Which equipment is used for separation of metallic contaminants?

Magnetic separators are available in a wide variety of designs to remove ferrous material such as nails, rust, scale, bolts, welding rod, and other contaminants from dry or liquid products.28 Sept 2012

What is eddy current in simple words?

Definition of eddy current : an electric current induced by an alternating magnetic field.

What is eddy current separator used for?

The Eddy Current Separator is used widely in the recycling industry to either recover or remove non-ferrous metals from non-metallic materials. Different designs enable the separation of small (down to 3mm) and large non-ferrous metals.

How are eddy current losses generated?

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.

Where are eddy current used?

The minor application areas where eddy currents are utilized include use in energy meters, automobile speedometers, induction alternating current (AC) motors, free-fall devices, as a way of detecting coins in vending machines, to increase temperatures uniformly in induction furnaces, and in proximity/displacement 8 Oct 2019

Where an eddy current is produce?

They can be created when a conductor is moving through a magnetic field, or when the magnetic field surrounding a stationary conductor is varying i.e. anything which results in the conductor experiencing a change in the intensity or direction of a magnetic field can produce eddy currents.

What does tramp metal mean?

Tramp metal is metallic scrap that may accidentally find its way onto conveyors and into bulk materials during the mining process. Some examples of tramp metal include bucket teeth, manganese steel mantles, bore crowns, bar scrap, chains, and tools.6 May 2018

How are the eddy current losses in the machine reduced?

Eddy current magnitude can be reduced by designing the core as a set of thin sheets or laminations, in parallel to the magnetic field. Each sheet must be insulated from its neighbours with a thin coating of varnish or oxide film. By laminating the core, the area of each section and hence the induced EMF is reduced.

How does an eddy current work?

Unlike mechanical brakes, which are based on friction and kinetic energy, eddy current brakes rely on electromagnetism to stop objects from moving. Eddy currents are created when a conductor passes through a magnetic field, which creates opposing forces that spin inside the conductor.14 Aug 2019

What is a metal separator?

Metal separator for free-fall applications. The Model FF Metal Separator is used to inspect bulk goods under free-fall conditions. It detects all magnetic and non-magnetic metal contamination (steel, aluminum, brass, stainless steel) even when enclosed in the product.

How much is an eddy current separator?

The price for a small rare earth eddy current separator for a MRF can start at $35,000, while a larger separator for more severe-duty applications can cost up to $160,000.

What is eddy current caused by?

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.Dec 2, 2021

How does an eddy current tube work?

As the magnet falls, the magnetic field around it constantly changes position. As the magnet passes through a given portion of the metal tube, this portion of the tube experiences a changing magnetic field, which induces the flow of eddy currents in an electrical conductor, such as the copper or aluminum tubing.

What is the function of magnetic separator?

A magnetic separator is a device that uses a magnet to remove impurities and other magnetic materials from metal. Magnetic separators can be used before, during and after the production of a material and can be adjusted to attract different types of magnetic materials at different intensity levels.

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