What is Induction Heating? What is Induction Heating?

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To the everyday engineer, induction is a captivating technique of heating. Watching a piece of metal in a coil turn cherry red in a matter of seconds could be shocking to those unfamiliar with induction heating. Induction heating equipment requires an understanding of physics, electromagnetism, power electronics and process control, but the fundamental ideas behind induction heating are simple to understand.

The Fundamentals
Discovered by Michael Faraday, Induction starts with a coil of conductive material (for example, copper). As current flows by means of the coil, a magnetic field in and across the coil is produced. The ability of the of the magnetic subject to do work depends upon the coil design as well as the quantity of current flowing via the coil.

The direction of the magnetic area depends upon the direction of present circulation, so an alternating present through the coil will end in a magnetic discipline altering in direction on the identical rate as the frequency of the alternating current. 60Hz AC present will cause the magnetic discipline to switch directions 60 times a second. 400kHz AC present will cause the magnetic subject to switch 400,000 instances a second.

When a conductive materials, a work piece, is placed in a altering magnetic discipline (for instance, a subject generated with AC), voltage might be induced within the work piece (Faraday’s Law). The induced voltage will end result in the circulation of electrons: present! The present flowing by way of the work piece will go within the opposite direction as the present within the coil. This signifies that we can management the frequency of the current in the work piece by controlling the frequency of the present in the coil.

As current flows via a medium, there shall be some resistance to the movement of the electrons. This resistance shows up as heat (The Joule Heating Impact). Materials which might be more immune to the stream of electrons will give off more heat as present flows by means of them, however it is certainly potential to heat highly conductive materials (for instance, copper) utilizing an induced current. This phenomenon is critical for inductive heating.

What do we want for Induction Heating?
All of this tells us that we want basic things for induction heating to occur:

A changing magnetic area
An electrically conductive materials placed into the magnetic subject

How does Induction Heating evaluate to other heating methods?
Diagram to represent traditional heating flow
There are several methods to heat an object without induction. Among the more widespread industrial practices embrace gas furnaces, electrical furnaces, and salt baths. These methods all rely on heat transfer to the product from the heat source (burner, heating ingredient, liquid salt) by convection and radiation. Once the surface of the product is heated, the heat transfers by way of the product with thermal conduction.

Diagram to characterize induction heating circulate
Induction heated products usually are not relying on convection and radiation for the delivery of heat to the product surface. Instead, heat is generated within the surface of the product by the circulate of current. The heat from the product surface is then switchred by way of the product with thermal conduction. The depth to which heat is generated directly utilizing the induced present will depend on something called the electrical reference depth.

The electrical reference depth depends enormously on the frequency of the alternating present flowing through the work piece. Higher frequency current will end in a shallower electrical reference depth and a lower frequency present will end in a deeper electrical reference depth. This depth also is dependent upon the electrical and magnetic properties of the work piece.

For many processes melting is the first step in producing a useful product; induction melting is quick and efficient. By altering the geometry of the induction coil, induction melting furnaces can hold expenses that range in measurement from the volume of a coffee mug to hundreds of tons of molten metal. Additional, by adjusting frequency and power, firms can process virtually all metals and materials together with but not limited to: iron, metal and stainless steel alloys, copper and copper-based alloys, aluminum and silicon. Induction equipment is customized-designed for every application to ensure it is as environment friendly as possible.

A major advantage that is inherent with induction melting is inductive stirring. In an induction furnace, the metal cost material is melted or heated by present generated by an electromagnetic field. When the metal becomes molten, this subject additionally causes the tub to move. This is called inductive stirring. This constant motion naturally mixes the bathtub producing a more homogeneous mix and assists with alloying. The amount of stirring is set by the size of the furnace, the facility put into the metal, the frequency of the electromagnetic discipline and the type/quantity of metal in the furnace. The amount of inductive stirring in any given furnace may be manipulated for particular applications if required.

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What is Induction Heating? What is Induction Heating?