Whether you are acknowledge with induction heating or it&#;s the first time that you get in touch with this technology, this following article is going to offer some frequently asked questions about induction heating so that help you have a general idea about it.
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What is induction heating?
The heating method known as induction heating occurs when an electrically conductive material is placed in a varying magnetic field. Induction heating is a rapid form of heating in which a current is induced directly into the part being heated. In this way, induction heating is a non-contact form of heating.
Is it possible to braze glass or ceramics with induction?
Yes, of course. If you want to work with glass or ceramics, then a compact vacuum furnace is a great solution for brazing. You&#;ll get quick, clean heat with very precise temperature control.
What makes up a typical induction heating system?
A typical induction heating system consists of the induction heating power supply, an induction heating coil, and a water-cooling source, which cools the coil and several internal components inside the power supply. The induction heating power supply sends alternating current through the induction coil, thus generating a magnetic field. When a work piece is placed within the coil and enters the magnetic field, eddy currents are induced within the work piece, generating precise and localized heat without any physical contact between the induction coil and the work piece.
What is an induction heating coil (inductor)?
The varying magnetic field required for induction heating is developed in the induction heating coil via the flow of AC (alternating current) in the coil. The coil can be made in many shapes and sizes to custom fit a specific application. The coils can range from tiny coils made of copper tubing used for precise heating of extremely small parts in applications such as soldering and ferrule heating to large coil assemblies of copper tubing used in applications such as strip metal heating and pipe heating.
Questions about induction heating
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Metallus
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Aug 17,
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Induction heating
In summary, the conversation discusses the basics of induction heating and how it works. The process involves passing alternating current through a hollow coil of copper, generating a magnetic field that heats a conductive material placed inside the coil. The discussion also touches on the use of a cooling fluid to keep the coil cool and the effect of the insulator between the coil and the heated material. The conversation also explores the safety concerns of putting a hand or finger into a powered coil and the role of frequency in induction heating. There are also hobbyist sites and videos available for those interested in making their own induction heaters.
Metallus
Hi there,
I'm a material chemist, currently working on ceramics. I know the very basics of physics, but I have many doubts about electromagnetism.
How does induction heating exactly work? I understand that you use a hollow coil of copper with a cooling fluid circulating inside, through which you pass alternate current at high frequency. This generates a (oscillating?) magnetic field that points towards the center of the coil (according to right hand rule). If you put an object inside, called susceptor, it gets heated.
1) Why does this happen? What happens exactly at a microscopic level in the susceptor to justify the generation of heat? I always imagine alternating two magnets on a rod of iron and I can't fathom how this would heat it.
2) Does this work with any object or just metals/graphite and why? What would happen if I put, eg, my hand inside an induction coil powered to heat graphite at C? What if I put an insulator?
3) I am amazed that the coil can heat graphite to C without melting, considering that copper melts at C. Yes, there is a cooling fluid circulating, but considering the graphite die is usually 1cm away from the coil, that seems really insane cooling. Or am I underestimating the effect of the insulator between the coil and the graphite die?
Thanks
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The material being heated needs to be conductive, the changing magnetic field creates eddy-currents in the material and the current creates the heat. Your thinking is correct about the magnets and a piece of Iron, but it needs to be a changing Magnetic field. - Example, if you look at the core of a transformer, it is assembled of laminated (insulated) steel plates, to reduce these currents in the core.
The coil does not need coolant flowing in it to make the effect work, it is only to keep the coil cool. To generate the strong magnetic field, the coil needs a lot of current.
Metallus
I understood that the coolant was for the joule effect, but if the material that is being heated is very close to the coil and it reaches °C, isn't there the possibility of the coil "softening" with just the radiation from that body? °C at 1 cm distance seem quite a lot to dissipate.
Also, if the material needs only be conductive, I assume I could safely put my finger inside a powered coil (granted I don't directly touch the coil and get shocked). Is that right or I'll still get "warmed"?
jim hardy
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Metallus said:
Also, if the material needs only be conductive, I assume I could safely put my finger inside a powered coil (granted I don't directly touch the coil and get shocked). Is that right or I'll still get "warmed"?
@Metallus
Test that with a hot dog before inserting your finger.
Metallus
jim hardy said:
@Metallus
Test that with a hot dog before inserting your finger.
Not planning of actually doing it :D, don't worry. I would be more scared of accidentally touching the coil and getting electrocuted, beside the fact that the coil itself heats up on its own. Just curious about what the effects would be on a human.
Not planning of actually doing it :D, don't worry. I would be more scared of accidentally touching the coil and getting electrocuted, beside the fact that the coil itself heats up on its own. Just curious about what the effects would be on a human.
jim hardy
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Metallus said:
Why does this happen? .
Induction 'induces' current in the material to be heated. That current generates heat by simple I2 X Resistance of the material in the magnetic field.
It needn't be high frequency but it's way more practical to use it .
That's because
rate of change of flux is what 'induces' and you well know that
dsin(ωt) = ωcos(ωt) . So raising ω let's you use smaller transformer and wire.There are plenty of hobbyist sites making induction heaters. Modern "Inverter" microwave oven power supplies are a popular power source, they rewind the high frequency SMPS power supply transformer to give low voltage high current. Youtube will show you fun hobbyist videos.
Induction 'induces' current in the material to be heated. That current generates heat by simple IX Rof the material in the magnetic field.It needn't be high frequency but it's way more practical to use it .That's becauseof flux is what 'induces' and you well know thatsin(ωt) = ωcos(ωt) . So raising ω let's you use smaller transformer and wire.There are plenty of hobbyist sites making induction heaters. Modern "Inverter" microwave oven power supplies are a popular power source, they rewind the high frequency SMPS power supply transformer to give low voltage high current. Youtube will show you fun hobbyist videos.
FAQ: Questions about induction heating
What is induction heating?
Induction heating is a method of heating an electrically conductive material by using an alternating magnetic field. This is achieved by placing the material in an induction coil, which generates the magnetic field. As the material is heated, its electrical resistance increases, causing it to produce heat.
How does induction heating work?
Induction heating works by using the principle of electromagnetic induction. When an alternating current is passed through an induction coil, it generates a changing magnetic field. This magnetic field then induces an electrical current in the material placed in the coil, causing it to heat up.
What are the advantages of induction heating?
Induction heating has several advantages, including high energy efficiency, fast heating speeds, and precise temperature control. It also allows for localized heating, making it ideal for heating specific areas of a material. Induction heating is also a clean and environmentally friendly method of heating, as it does not produce any harmful emissions.
What materials can be heated using induction heating?
Induction heating can be used to heat a wide range of electrically conductive materials, including metals such as iron, steel, copper, and aluminum. It can also be used for non-metallic materials like graphite and some plastics, as long as they have a conductive coating.
What are the common applications of induction heating?
Induction heating is commonly used in various industries, including automotive, aerospace, and manufacturing. It is often used for heating and melting metals in foundries and for heat treatment processes such as annealing, hardening, and tempering. It is also used for brazing, soldering, and bonding in the electronics industry.
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