Induction Furnace Eddy Current

Induction Furnace Eddy Current

Induction Furnace Eddy Current effect

Using enough power to generate a large eddy current in the conductor, current in the conductor can generate heat, causing the metal to be heated or even melted. So induction furnaces were made to smelt metals. In an induction furnace electric diagram, there is a high-power power supply that generates high-frequency current and a coil that generates an alternating magnetic field. A crucible made of refractory material (such as ceramics) is placed in the middle of the coil to hold the metal to be melted. Eddy current induction heating is widely used, such as smelting metal with high-frequency induction furnaces, plasticizing with a high-frequency plastic hot press, and using an eddy current thermal therapy system for treatment. It is often used in induction hardening, induction annealing, and other methods in metal materials science. To improve the surface hardness and wear resistance of the workpiece.

Advantages of Induction Furnace Heating:

1. Non-contact heating, the heat source, and the heated object can not be in direct contact

2. High heating efficiency and fast speed can reduce surface oxidation

3. Easy to control temperature and improve processing accuracy

4. Local heating can be realized

5. Automatic control can be realized

6. It can reduce land occupation, heat radiation, noise, and dust. The steel disc rotates in the magnetic field of the body magnet, which will arouse an eddy current in the steel disc. The eddy current interacts with the magnetic field to generate a dynamic damping force, thus providing braking torque. This braking method is often used in damping braking of electric meters, eddy current brakes of high-speed locomotive braking, etc.

Detection

Induction Furnace  Eddy Effect

The eddy current metal detector has a detection coil through which an alternating current of a certain frequency flows, and the alternating magnetic field generated by the coil excites an eddy current in the metal object, and the equivalent resistance and inductance of the concealed metal object will also be reflected into the detection coil, changing Metal objects can be detected by detecting the magnitude and phase of the coil current. Eddy-current metal detectors can be used to detect guns in luggage bags, landmines buried on the ground, the thickness of metal coatings, etc.

Of course, in production and life, sometimes the eddy current effect must be avoided. For example, the iron core of the motor and transformer will generate an eddy current when it is working, which will increase energy consumption and cause the transformer to heat up. To reduce the eddy current, the method that can be adopted is to change the whole iron core into an iron core laminated with thin sheets, weaken the loop resistance and reduce heat loss.