How to choose the number of inductor turns and the spacing of the workpiece in the induction heating furnace

How to choose the number of inductor turns and the spacing of the workpiece in the induction heating furnace
 
The shape, size, number of turns, workpiece material, coupling position of the workpiece heating part and the inductor of the induction heating furnace will affect the heating effect and the actual output power of the induction heating furnace. When inductive heating of ferromagnetic workpieces such as steel, priority is given. When using 2~4 ring inductors, when the materials with poor magnetic conductivity such as copper and aluminum are heated by induction, the number of inductor turns should be increased. Generally, the larger the diameter of the inductor, the heavier the load (larger or larger after the wall) The number of inductors is smaller. The smaller the diameter of the inductor and the lighter the load (small workpiece or thin-walled workpiece), the number of turns can be increased appropriately. In principle, the sensor can be used as long as the device can start normally. However, if you use a sensor with too many turns, the load on the device will be heavy, which will affect the service life of the device.
The distance between the induction heating furnace sensor and the workpiece should be selected according to the specific heating process. The magnetic field strength at different positions in the induction coil is different, and the field strength near the copper tube tends to be the largest. Therefore, in the process of quenching, welding, etc., When the workpiece is instantaneously heated to the quenching temperature, a smaller pitch should be selected, which is about 2~3mm. For the process of annealing, pre-heating, etc., in order to heat the workpiece evenly and slowly, a larger spacing should be selected. , greater than 10mm. When selecting the sensor spacing, factors such as heating position, workpiece pick-and-place, etc. should also be considered. The induction coil is too long, which will affect the heating effect. In heating, in principle, the workpiece should not touch the coil. But sometimes due to magnetic force or For other reasons, the workpiece may also come into contact with the sensor. When the single-turn coil is touched, it has no effect on the device. If the workpiece touches two or more turns, the sensor will be shorted to reduce the number of turns, causing the machine to pass. Flow. Therefore, it should be avoided to contact the sensor when the workpiece is heated.
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