The furnace’s magnetic field is guided by the short-circuit ring fitted above the
Active coil, and by the yokes extending radially around the coil. As a result,
Only a weak magnetic stray field can form near the furnace. Measurements
Conducted on several OTTO JUNKER furnace installations to determine the
Electromagnetic field strength in the operator area have demonstrated that
These fields are weak indeed and remain for below the permitted limits/11/.
This is the result of optimized equipment design and dimensioning. Particularly of the yokes, in terms of each furnace’s specific power rating and operating
Frequency. The operation of coreless induction furnaces without short-circuit
Ring and yokes is not acceptable because the resulting strong magnetic fields
would pose excessive health hazards.