The frequency of induction heating systems varies depending on the specific application and the size of the workpiece being heated. Here are the key frequencies mentioned in the references:
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High-Frequency Induction Heating: This system operates at a frequency of 100～500 kHz, suitable for smelting small amounts of precious metals (1-5 kg) and for hardening small to medium-sized parts with an effective hardening depth of 0.5-2 mm. This is ideal for parts like small module gears and medium-sized shafts that require a thin hardened layer.
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Medium Frequency Electric Induction Furnace: This type of furnace, used for a variety of applications including melting, heating, and heat treating, operates at a frequency range of 150-8000 Hz. This medium frequency range is suitable for a broader set of applications compared to high-frequency systems, including larger workpieces and deeper hardening requirements.
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Medium Frequency Induction Heating Power Supply: This system typically operates between 1kHz and 10kHz. It is used for larger tempering, quenching, and heating applications, suitable for large-size workpieces like large diameter thick wall pipes and large workpieces requiring deep heat penetration.
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Super Audio Frequency Induction Heating Power Supply: Although the specific frequency range for super audio frequency systems is not detailed in the provided text, it is typically higher than medium frequency but lower than high frequency, often used for applications requiring intermediate heat penetration depths.
In summary, the frequency of induction heating systems can range from 100 kHz for high-frequency applications involving small parts with shallow hardening depths, to 1-10 kHz for medium frequency applications involving larger and thicker workpieces, up to 8000 Hz for medium frequency induction furnaces used in melting and broader heat treatment processes. The choice of frequency is critical as it determines the depth of heat penetration and the suitability for different types and sizes of workpieces.
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