There is an equation that gives you what the optimal or the optimal frequency is.
There is an equation that gives you what the optimal or the optimal frequency is. Running below that threshold you will not be able to utilize the entire heating efficiency of the setup. But running above that threshold, you are not really sacrificing a whole lot.
Induction heating power supplies typically come in a band of frequency. A typical frequency on a power supply might vary from 15 to 40 kHz for example. A 15 kHz frequency is the threshold you could run the process at 18, 20, and 25, all the way up to 40 without having any detrimental effect. But if the threshold frequency was 40 kHz and you're trying to run at 20 kHz, then you would not be able to heat it as effectively. The efficiency goes down, which means that you have to pump in a lot more energy into the power supply to get the same amount of heat. Typically, the important thing to remember is you need to be past the critical frequency threshold. If you're above that critical frequency threshold, you're able to run the process without any issues.