Induction heating works because there is an alternating electrical current which is applied to the primary of a transformer, as that creates an alternating magnetic field. Faraday's Law states if the secondary of the transformer is located within the magnetic field, an electric current is induced. In this post, we'll dig into the theory behind Faraday's Law of Induction, as it's important to understanding the theory of induction heating.
In this blog post we'll provide a quick overview of the basics of induction heating. When current is passed through an inductor, a magnetic field is created around that wire. With an AC circuit the magnetic field will collapse and change polarity, as the current changes polarity. When a second conductor is placed in the alternating magnetic field, an alternating current will be generated in the second conductor. The current in this second conductor is proportional to the current in the first conductor and the inverse of the square of the distance between the two conductors.
An company came to THE LAB at Ambrell needing to insert brass threaded inserts into seven locations on a plastic thermostat housing. THE LAB determined that an Ambrell EASYHEATTM 3.5 kW induction heating system would be the right solution for their heat staking application. Three different coils for varying patterns were designed by Ambrell's team of applications engineers and used during testing.