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The principle of induction heating
The hot forming elbow machine and pipe expanding machine are both heated by induction heating.
The principle of induction heating is to follow the three basic principles of electromagnetic induction, skin effect and heat conduction.Induction heating is illustrated by a simulated single-turn short-circuit secondary coil.Taking the heating mode of the aid as an example, the combination of the workpiece and the inductor can be seen to be a transformer with a multi-turn primary coil (inductor coil) and a single-turn short-circuit secondary coil (cylindrical workpiece). The primary coil and the secondary coil are separated from each other by a small air gap.When energized, an induced current with the same frequency and opposite direction will be generated in the workpiece, namely eddy current.When the current frequency is high, due to the surface effect, the eddy current is concentrated on the workpiece surface, resulting in "skin effect".

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