Specializing in Induction Heating Technologies

Induction Heating


A conductive work piece (such as a steel bar) placed in the copper coil is rapidly heated to high temperatures by induced currents from the highly concentrated magnetic field.

A source of high frequency electricity (high frequency power supply) is used to drive a large alternating current through an induction coil. In induction heating this is known as the “work coil”.


The passage of current through this induction heating coil generates a very intense and rapidly changing magnetic field in the space in the work coil. The work piece to be heated is placed in this intense alternating magnetic field.


The alternating magnetic field induces a current flow in the conductive work piece. The arrangement of the work coil and the work piece can be thought of as an electrical transformer. The work coil is like the primary where electrical energy is fed in, and the work piece is like a single turn secondary that is short-circuited. This causes tremendous currents to flow through the work piece. These are known as “eddy currents” which generates high levels of I²R losses in work piece causing temperature to rise. In addition to this, the high frequency used in induction heating also has a phenomenon known as “skin effect". This skin effect forces the alternating current to flow in a thin layer towards the surface of the work piece. The skin effect increases the effective resistance of the metal to the passage of high level of current. Therefore it greatly increases the heating effect of the induction heater caused by the current induced in the work piece.