The structure of the medium frequency iron coreless induction furnace (see Figure 1) mainly consists of three parts:

1. Induction coil (wound by water-cooled copper tube)

2. Crucible (usually made of refractory materials)

3. Furnace charge (can (for fragments of various metal materials)

The basic principle of the medium frequency ironless induction furnace is a type of air core transformer. The induction coil is equivalent to the primary winding of the transformer, and the metal charge inside the crucible is equivalent to the secondary winding (ie load) of the transformer. When the primary winding The medium-frequency current (200Hz-8000Hz) passing through the medium frequency current (200Hz-8000Hz) generates magnetic force lines to cut the secondary winding under the action and response of the electromagnetic field, causing the charge to generate an induced electric potential and causing an induced current (called eddy current) in the surface perpendicular to the axis of the induction coil. This causes the charge itself to heat up and melt the metal