Induction heaters have experienced rapid growth in Western society. What was originally a restricted technology that used to be used commercially and in industrial applications is now the number one way in which the majority of households cook their meals. This has sparked widespread adoption of induction cookers, at such a pace that the former leaders of the market are being challenged by a number of new and innovative technologies that promise to make things even better for consumers.
I have always been fascinated by the idea of an induction heater . Since I was a youngster, I could see a bright future ahead in terms of cheaper and cleaner energy.
How to build a induction heater
Induction heaters are a great way to heat up your workshop without adding a lot of extra heat to the room. They are also very useful when you need to work with metal, wood or other materials that require high temperatures. In this article we’ll show you how to build one using simple materials and tools.
Induction heating is based on electromagnetic induction — the production of an electromotive force (EMF) in a conductor by a changing magnetic field in the conductor itself. It works by utilizing two types of coils: primary and secondary. The primary coil is placed around the material that needs to be heated and generates an alternating current through it. This current then passes through the secondary coil which has been tuned so that it resonates at the same frequency as the primary coil — creating an alternating magnetic field that induces currents in itself too. These currents create their own magnetic fields which interact with those from the primary coil — producing heat in the process (the secondary coils are also known as “work coils”).
The induction heater is a device that heats metal objects using an electric current. It consists of two parts: a copper coil, and a magnet. The copper coil is placed around the object to be heated, while the magnet passes through it.
A current is passed through the copper coil, generating an electromagnetic field. This field causes an induced current in the object being heated, which produces heat as it flows through resistance.
To build one yourself you will need:
-copper wire (approx 2mm diameter)
-a 1 Hp inverter to power it
The induction heater coil is made from a steel pipe with a diameter of 10–20 mm. The pipe must be thick enough to withstand the heat it will generate and heavy enough to maintain its shape during operation.
The diameter of the pipe should be at least three times larger than the diameter of the magnetron tube. This ensures that there is enough metal in contact with the magnetron tube so that it will heat up quickly, but not so large that it takes too long for the metal to heat up.
Copper tubing or metal rods can be used as well, but these will be much more expensive than steel pipes. Copper tubing is a good choice if you want to make a short demonstration model, since it can easily be bent into shape and soldered together. The problem with copper tubing is that it tends to expand when heated and then contract again when cooled down, which makes it harder to get an accurate measurement when making measurements on an actual device later on.
A coil of wire wound around a ferromagnetic core can be used to generate very high localized magnetic fields. This is the principle behind induction heating.
Induction heating is a method of heating a conductive material using a high frequency alternating current (AC) passed through an induction coil. The alternating magnetic field generated by the current induces eddy currents in the conductive material, which create their own magnetic field and thereby heat up the material. Induction heating is used in soldering, brazing and smelting processes where heat is required at a specific point or location.
The basic idea behind induction heating is that an electromagnet can be constructed by winding wire around a ferromagnetic core such as iron or steel, so that when current flows through the wire it creates an electromagnetic field around it. When this electromagnet is placed near another piece of iron or steel, which has its own inherent magnetic properties, it will cause eddy currents to flow within this second piece of material due to Faraday’s law of induction (i.e., whenever there is a change in magnetic flux density through a loop, an electric current will flow). These eddy currents will create their own magnetic field which opposes the primary field created by
Induction heating is a form of electric resistance heating. Unlike other forms of electrical heating, such as resistance or radiant, induction heating does not directly heat the material being worked. Instead, it uses electromagnetic energy to create eddy currents in the material, which in turn generates heat by friction.
Induction heating is widely used for industrial processes and manufactured goods, including metal shaping and welding, brazing and soldering, plastic injection molding, melting and casting of metals and glass, semiconductor processing and many other applications. It can also be used for nonindustrial purposes such as cooking utensils such as frying pans and waffle irons.