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　　Next, the medium-frequency induction furnace manufacturer will explain the operating principle of medium-frequency induction furnace equipment as well as common faults.

　　Medium-frequency induction furnace manufacturer: What is the principle behind medium-frequency induction furnace equipment?

　　You know. Medium-frequency electric furnace The principle behind the equipment? Let me tell you something about its working principle: Based on the fundamental principle of electromagnetic induction, the equipment rectifies and converts three-phase power-frequency AC current into DC current, and then further converts this DC current into an adjustable intermediate-frequency current. This intermediate-frequency current is then supplied to a load composed of capacitors and induction coils (the coils and capacitors can be connected either in parallel or in series). As a result, high-density magnetic flux lines are generated within the induction coil, which cut through the metallic material inside the coil, inducing large eddy currents in the metal.

　　This eddy current also exhibits some characteristics of medium-frequency currents: the free electrons within the metal itself flow through the resistive metal body, generating heat in the process. For example, if a metallic cylinder is placed inside an induction coil carrying a medium-frequency alternating current—without direct contact between the cylinder and the coil—the temperature of the coil itself remains quite low. Yet, the surface of the cylinder heats up rapidly to the point of turning red or even melting. The speed at which the cylinder turns red and melts can be precisely controlled by adjusting the frequency and intensity of the current. If the cylinder is positioned at the center of the coil, the temperature around the cylinder will be uniform, and its heating and melting will not produce harmful gases or intense light pollution that could harm the environment.

　　Medium-Frequency Induction Furnace Manufacturer: Common Faults and Troubleshooting Methods for Water-Cooled Cables in Medium-Frequency Furnaces

　　1. Mid-frequency furnace water-cooled cable breakage

　　The external flexible hose for the induction coil is a pressure-rated rubber hose with a pressure rating of 5 kg, internally filled with cooling water. It forms part of the load circuit and, during operation, is subjected to tensile and torsional forces. As the furnace body tilts, the hose bends and twists accordingly. After prolonged use, it tends to fracture at the flexible joint. Once the hose breaks, it becomes extremely difficult to start the medium-frequency furnace; sometimes, the furnace can still start normally, but during the energization process, the overcurrent protection will trip.

　　Handling: Due to the high current density, the water-cooled cables on medium-frequency furnaces are prone to wire breakage once they run low on water. A broken cable can lead to open-circuit conditions and false connections that are difficult to detect with standard instruments. To address this issue, shake the medium-frequency furnace, use a low-resistance meter to check the connections, or replace the water-cooled cable with a new one.

　　2. The water-cooled cable of the medium-frequency furnace was burned out.

　　Burning out the water-cooled electricity. Medium-frequency electric furnace During the cable’s operation, most of it breaks first; then, when the system is running at high power, the undamaged portion quickly burns out. At this point, the intermediate-frequency power supply generates a very high overvoltage. If the overvoltage protection is unreliable, the thyristors will be damaged. After the water-cooled cable disconnects, the intermediate-frequency power supply cannot start operating. If you repeatedly attempt to restart the system without first identifying the cause, you’re likely to damage the intermediate-frequency voltage transformer.

　　Procedure: When troubleshooting, use an oscilloscope. Clip the oscilloscope probe across the load terminals, press the start button, and observe whether a damped waveform appears.

　　That’s all for today’s explanation from the editor of the medium-frequency induction furnace manufacturer. Thank you for watching. We hope the information provided above has been helpful to you.