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Shiyan Hengjin Induction Technology Co.,Ltd
Address:NO.6 Pulin 1st road, Pulin Industry Garden, Shiyan City, Hubei province

Shanghai Shangpin Electrical Equipment Co.,Ltd (Foreign Trade Center)
Address: Room 912,Fudan Software Park B,No.15 Changyi Road,Baoshan District, Shanghai 
Tel: +86-21-61173797
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18 Commonly Used Terms in Induction Heating Industry , Can you Speak out and Understand its Meaning?
1. Induction heating When the alternating current flows through the inductor coil, it will produce an alternating magnetic field around it. In the alternating magnetic field of the metal conductor from the magnetic field to absorb electromagnetic energy and heat, so induction heating is electromagnetic heating.

2. Current The current is an abbreviation of current intensity, which measures the amount of charge passing through the conductor cross-section per unit time, which is the rate at which the tap water flows along the pipe, in amperes (A). In induction heating applications, the current in the inductor coil is in the tens of amps to tens of thousands of amperes.

3. Voltage Voltage (potential) is the driving force of the current, from the battery, AC power, high-frequency generator. The voltage and voltage drop are similar to the pump pressure and the pressure differential across the line. The voltage is always applied across the circuit element in volts (V). The voltage across the single-turn sensor is several volts and reaches several kilovolts for the multi-turn coil of the smelting furnace.

4. Impedance impedance is the ratio of voltage and current, is one of the basic parameters of the circuit, the unit is ohm (Ω), 1Ω = 1V / A.

5. Magnetic field Magnetic field is a kind of physical field, it is distributed in the surrounding space, and with the field source changes in a timely manner, current and permanent magnets are magnetic source.

6. Magnetic lines of magnetic force lines help to observe the distribution of magnetic field, magnetic field density of the magnetic field is strong. The magnetic field lines are always closed around the source of the field, which is the same as the flow of water in a closed circular water pipe.

7. Flux (φ) Flux is a measure of the magnetic field, it is like the flow of liquid. As with the potential generating current, the magnetic potential generates a magnetic flux. The current in the coil, or rather the ampere-turns of the coil, is the magnetic potential. The flux path must be closed, in units of Weber (Wb).

8. Magnetic induction (B) It is a measure of magnetic flux density and is a vector. This is analogous to the velocity vector at a point in the flowing liquid, in units of Tesla (T).

9. Magnetic Field Strength (H) It is a measure of the strength of the magnetic potential, which is like a pressure gradient somewhere in the water. The unit is the amperes per unit length A / m.

10. Permeability For linear magnetic media, the ratio B / H has a defined value called the absolute permeability of the substance. We can define the relative permeability of the material by calibrating the air permeability to 1. The relative permeability is 1 for all non-magnetic materials. The relative permeability of ferromagnetic materials can reach tens of thousands, and its value is also affected by the magnetic field strength, which indicates that in the same magnetic flux required to reduce the situation.

11. Reluctance Reluctance resistance in the circuit, the circuit voltage (potential) of the current flow through the resistor. In a magnetic circuit, the magnetic flux generated by the ampere-turns (magnetic potential) of the coil "flows through" the magnetic reluctance of the magnetic circuit. In the case of the same magnetic flux, the magnetic circuit into the ferromagnetic material required current is small, no ferromagnetic material required current is large, or that the same current into the coil, the former generated magnetic flux , While the latter is small.

12. Magnetic Field Energy is an energy associated with a magnetic field, which is present in the space around the current carrying conductor, which is the source of the magnetic field. For alternating current, the magnetic energy is continuously converted into electrical energy in the coil circuit, and then the electrical energy is converted into magnetic energy. In each cycle of energy conversion, the conductor absorbs part of the energy. The unit of magnetic energy is Joule (J), the more commonly used unit in industrial applications is kilowatt-hour (kWh), 1 kWh = 3600000 J.

13. Apparent Power This is the product of the voltage and current in the circuit in kilovolt-amperes (kVA). For example, if the primary voltage of a transformer is 800 V and the current is 500 A, the apparent power is equal to 400 kVA. In direct current (DC), the apparent power is equal to the active power, at this time "apparent" is meaningless. In alternating current circuits (AC), especially in tank circuits of induction heating equipment, only a portion of the energy is absorbed by the workpiece when electrical energy is continually exchanged with the magnetic energy, as in the 50 Hz AC motor circuit. Absorb the same.

14. Active Power It is the amount of absorbed power per unit time (1 second), often in kilowatts (kW). Active power is always less than (at most equal to) apparent power. For example, if the voltage across the inductor is 50V and the current is 4000A, the apparent power is 200kVA. The active power absorbed by the workpiece and the sensor is 30kW (power factor is 0.15) or 80kW (power factor is 0.4).

15. Reactive power It is induction heating device, by the sensor and capacitor group composed of oscillation tank, the exchange of energy and magnetic energy when the size of the electromagnetic power. This indicates that a portion of the power supplied by the power supply is to be returned to the power supply by the tank circuit. The unit used is kVAR, which is equal to the square of the apparent power and the active power.

16. Power Factor (cosφ) It is the ratio of active power to apparent power (kW / kVA). The value represents the amount of active power absorbed in one cycle of the electromagnetic oscillation.

17. Hysteresis loss (HL) ferromagnetic material inside the magnetic molecules in the alternating magnetic field, constantly changing direction and the internal friction caused by the loss that hysteresis loss. Induction heating process, the low frequency hysteresis loss does not exceed 10%, with the frequency increases due to increased friction and wear and tear also increased. The HL value for non-magnetic materials (para magnetic and demagnetizing substances) is zero.

18. Eddy current losses Due to the coupling of magnetic fields, eddy currents are generated in the conductor when alternating magnetic fluxes pass through the cross-section of the conductor. Conductor must have a closed conductive loop will produce eddy current, the conductor will also heat. Imagine placing a thin, open-ended metal ring into an alternating magnetic field that does not generate heat even if there is voltage across the opening. It is emphasized that the relationship between hysteresis loss and eddy current loss is fixed for an induction heating device with a fixed size and frequency, but it can not separate the hysteresis heating and eddy current heating. The former only accounts for a small part of the total loss, The latter accounted for the main part.

Shiyan Hengjin induction has more than 10 years of industry experience on induction heating , the induction heating equipment for a variety of metal heat treatment, welding, melting, through heat and other thermal processing industry. Equipment imported by the European patented technology, and after upgrading, Hengjin induction has  the unique patented in heating technology.

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