Medium frequency melting furnace
in the sensor must be used in the design of the electromagnetic effect, so commonly used in electromagnetic effect in the intermediate frequency furnace design, then what kind of?
Intermediate frequency electric furnace beginners in the design of the sensor coil encounter these problems will not clear, small make up a list in the intermediate frequency furnace commonly used four electromagnetic effect.
Four kinds of medium frequency melting furnace used electromagnetic effect and skin effect (1
Also called surface effect)
: when the medium frequency power supply electric current through a conductor, the conductor surface current density is big, the farther the smaller the current density at the centre of the phenomenon;
2, proximity effect: two current of the conductor at the same time, the direction of the medium frequency power supply current flows from the outer edge of the two conductors, the minimum current density on the surface of the conductor adjacent;
Conversely, if the current in the opposite direction, current flows from the inside of the two conductors, the current density on the surface of the adjacent conductors.
This kind of phenomenon be proximity effect of high frequency current.
The higher the frequency, the closer two conductors by, proximity effect is more significant.
3, annular effect (
Also called circle effect or circulation effect)
: the high frequency current on a cylindrical shape, round ring or helical cylindrical tubular parts, large current density distribution of cylindrical (
Circular ring or helical cylindrical tube)
The inside of the parts, namely the current density is big, the inside of the ring this phenomenon is called ring effect.
4, sharp-angled effect: the Angle (
Edges and corners)
Put load circular or irregular shape of the parts of the sensor, if the height of the parts less than the height of sensors, induction heating, the load Angle position or angular part of the parts, because of the large eddy current intensity heating is intense, raise the temperature in a very short time, and cause overheating, this phenomenon is called Angle effect.
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