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1. Influence of power frequency on electrical efficiency : Under the same conditions, as the power efficiency increases, the electrical efficiency rises from low. When the power frequency increases to a certain value, the electrical efficiency reaches a maximum value. As the power efficiency continues to increase, the electrical efficiency remains the same and is at its maximum. The electrical efficiency at this time is the theoretical limit of induction heating, which is 86.5%, that is, the current in the layer of penetration depth δ2 is all converted into heat for heating the metal. This can be seen. The electrical efficiency of any sensor will not reach the ratio. Therefore, when selecting the power efficiency from the induction heating efficiency, it is not necessary to pursue an excessive power supply frequency. Usually when the electrical efficiency reaches 75%~50%, it can be used as the basis for selecting the power frequency.
2. Influence of power frequency on thermal efficiency: Under the same conditions, the thermal efficiency decreases with the increase of the power frequency. Because as the power frequency increases, the skin effect of the current increases, the metal surface temperature rises faster, the relative heat loss increases, and the thermal efficiency decreases. It is advantageous to select a lower frequency power supply for heating from the thermal efficiency of induction heating.
3. Influence of power frequency on total efficiency: The relationship between the overall power frequency and the electrical efficiency and thermal efficiency can be influenced by the total efficiency. The relationship between power efficiency and total efficiency becomes the main basis for selecting the power frequency. When the total efficiency reaches 70%~75%, the power frequency corresponding to D2/δ2=3~5 is a suitable choice. Usually, the power frequency corresponding to the Curie point (800°C) is determined according to the diameter of the heated steel. .
In summary, the main condition for selecting the power frequency is its relationship with the heating efficiency. Only the steel diameter and the power supply frequency satisfy the condition of D2=(3~5)δ2, and the highest total efficiency and the appropriate power frequency can be obtained.
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