induction heating is the process of heating a metal (an electrically conducting object) by electromagnetic induction, through heat generated in the object by eddy currents (see Faraday’s law of induction).
An induction heater is generally built with a solenoid (a coil of the appropriate size) where an high frequency alternate current can give rise to a magnetic field.
The magnetic field penetrates the object, generating electric currents inside the conductor called eddy currents. The eddy currents flowing through the resistance of the metal body that is placed near the solenoid (even better if immersed into) and because of effect Joule, it dissipate energy in the form of heat, so the metal body can heat without any physical contact. The equipment that powering it is a generator of Medium or High Frequency. The power and the frequency of current used depend on the geometry of the body to be heated, its size, material type, coupling (between the work coil and the object to be heated), temperature to be achieved, time of heating and the penetration depth.
An important feature of the induction heating process is that the heat is generated inside the object itself, instead of by an external heat source via heat conduction.
Thus objects can be very rapidly heated.
In addition there need not be any external contact, which can be important where contamination is an issue. Induction heating is used in many industrial processes, such as heat treatment in metallurgy, in the semiconductor industry, and to melt refractory metals which require very high temperatures.
Benefits of Induction heating:
- Energy Savings: The energy is channeled only to the material, without dispersion in the environment;
- High speed: The heating is instantaneous when processing;
- Accuracy of temperature: The Manager is a digital microprocessor;
- Accuracy in the zone of heating: The inductor was designed using mathematical models;
- Quality Process: Management HMI (Human Machine Interface) ensures repeatability of the process;
- Safety and security: No fire and no fuel is used;
- Protecting the environment: No gas is burned and no gas is emitted.