Frequency selection for induction heaters is a critical design parameter that directly affects heating efficiency, depth of penetration, and the physical size of the unit. Here are some considerations for frequency selection for induction heaters:
1. Depth of penetration: Frequency is related to the depth of penetration of electromagnetic waves in a substance. Higher frequency electromagnetic waves have a shallower depth of penetration in matter, while lower frequency electromagnetic waves have a greater depth of penetration. Therefore, according to the size and shape of the target object to be heated, select the appropriate frequency to ensure more uniform heating.
2. Heating efficiency: The efficiency of electromagnetic induction heating varies with different frequencies. Generally speaking, high frequency electromagnetic field can transfer energy to the material more effectively, so under the same power, high frequency heating efficiency is higher.
3. Material Properties: The response of different materials to electromagnetic fields varies with frequency. Certain materials are easier to heat in a particular frequency range. Therefore, choosing the right frequency helps to optimise the heating effect.
4. Equipment Size: Higher frequencies typically require smaller coil and equipment sizes, which may be an advantage in some space-constrained applications. Conversely, lower frequency equipment may be larger and suitable for heating some large objects.
5. Electromagnetic interference: Electromagnetic waves of different frequencies have different propagation characteristics in space, and choosing the right frequency can reduce the possibility of electromagnetic interference and guarantee the stable operation of the equipment.
Generally speaking, the working frequency of the induction heater can be selected in the range of several hundred kilohertz to several megahertz, the actual choice will be based on the requirements of the specific application and the nature of the particular material. Detailed engineering analyses and experiments are required when selecting the frequency to ensure optimum heating effect and equipment performance.
