The structure and working principle of high-frequency electromagnetic induction heating system
The electromagnetic induction heating system consists of two parts: the electromagnetic controller and the induction heating coil.
The electromagnetic controller is the core part of the high-frequency electromagnetic induction heating system. It includes the chassis, rectifier system, inverter system, trigger control system, protection system, monitoring system and cooling system.
The AC power supply rectifies, filters, and inverts the industrial frequency AC power into high-frequency AC power through various major systems in the electromagnetic induction controller. It is then connected to the electromagnetic induction heating coil to generate an alternating electromagnetic field. The alternating magnetic field then passes through the insulation material. Indirectly acts on the barrel screw, causing the barrel screw body to heat up quickly.
Conditions for use of high-frequency electromagnetic induction heaters
1. Input power supply: AC 220V+15%, frequency 50Hz~60Hz single phase or AC380V+15%, frequency 50Hz~60Hz three-phase four-wire system;
2. Output power: 1KW--60KW various specifications (including single-phase and three-phase controllers);
3. Rated power: 90%-110% of nominal value (setting);
4. Ambient temperature: 0-20℃~50℃;
5. Relative humidity: ≤85%;
6. Installation and debugging of high-frequency electromagnetic induction heater.
The installation of high-frequency electromagnetic induction heating system is roughly divided into two major processes:
Part - is the correct winding production of electromagnetic induction coil:
Use high-temperature wires that meet certain temperature resistance and wire diameter requirements to be wound on the heated body to form a coil with appropriate inductance. Note: the coil should be kept 10-15mm away from the surface of the metal material and parallel to the surface of the metal material. , can't exchange high and low cross, otherwise it will affect the heating effect; after winding the coil, use an inductance meter to measure the inductance of the coil, so that the inductance matches the inductance index of the corresponding control cabinet. The output extension wire of the induction coil should be twisted into a twist, and then connected into the high-frequency output terminal during the control period.
The second part is the correct connection of the electromagnetic induction coil, thermocouple and electromagnetic induction controller. Use AC 380v power supply. The power incoming line adopts a three-phase four-wire system and is connected to the corresponding: L1, L2, L3 and N in the chassis ( (Except for low-power single-phase controllers), the induction coils are connected to the corresponding high-frequency output wiring respectively. The specific wiring methods are divided into the following two types:
Method 1: The power frequency AC power can be directly input into the corresponding terminal in the electromagnetic induction heating controller, and then the output pile head of the controller can be correctly connected to the induction coil and thermocouple on the barrel. In this method, electromagnetic induction The controller acts as an independent control, monitoring, execution, and protection function.
Method 2: If the control system of the original equipment is a temperature controller plus contactor control, and the heater of the original equipment is a high-frequency heating modified from a conventional heating coil, the series connection method can be used, that is, the power supply is directly input. to the electromagnetic induction controller, and use the original temperature controller to directly control the entire electromagnetic induction controller. In this case, the wiring method is as follows.
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