1.What is the concept of induction heating ? 
The application principle of the induction  melting  furnace is in the case of induction heating, the metal is placed in the region of the strong magnetic field passing through the alternating current coil. When the alternating current is passed through the coil, the alternating magnetic field in the size and direction is generated inside the coil. When the alternating magnetic field cuts the metal body placed in the magnetic field of the inductor, it induces an induced current (eddy current) in its surface layer. These eddy currents can heat the metal.

2. Induction heating systems need to have those parts of the concept

Consisting essentially of an induction heating system comprising an intermediate frequency power source , the induction coil and the workpiece depending on the heating object, the induction coil made into different shapes. Connected to the coil and the power supply to the coil to provide alternating current through the coil of the alternating current Produces a magnetic field that alternates through the workpiece, which causes the workpiece to create eddy currents for heating.

3. What is the main purpose of induction heating?

Induction heating is mainly used for metal thermal processing, heat treatment, welding and melting, and is also suitable for many other fields of packaging and curing.

4. What is the concept of the object of induction heating ? What are the different concepts of heating effect for different materials?

The heating object should be a conductor with a certain magnetic permeability. Because of the different magnetic permeability of the medium, the heating effect is different. Therefore, when heating, the magnetic metal such as steel and iron can be rapidly heated in a short time, while copper and aluminum are heated. Relatively slow. For example: medium frequency diathermy

5. What is the concept of skin effect ?

The skin effect of the medium frequency electric furnace is also called the surface effect. In the induction heating, the penetration depth of the current depends on the current frequency, the resistivity of the workpiece and the magnetic permeability. When the resistivity and permeability of the material are constant, the frequency of the heating current is higher. High, the current on the workpiece tends to the surface of the workpiece, and the penetration depth of the current is shallower.

6. Why is the concept that the input power is lower than the output power among the rated parameters of the equipment?

This is because the two methods of measurement are different. The input power is measured by the active power of the public frequency state device. The output power is measured by the peak-to-peak value of the oscillation power in the high-frequency state.