Electromagnetic induction heater coil selection principles

For the entire set of electromagnetic heaters, the core function of the coil is heating. This is also the significance of the development of the electromagnetic induction heating product application. If an electromagnetic heating product cannot heat or has poor heating effect due to poor coil winding, it is equivalent to building a house but not being able to live in it, building a car but not being able to drive it, or making a plate of delicious food but not being able to Eating means nothing.

Since the coil is so important, how to select the coil?

Three aspects should be considered - the wire itself, the coil winding, and the applicable site.

1. The wire itself

There are many types of wires themselves, such as high-frequency wires, mica wires, waterproof wires, silicone wires, nickel-plated wires, pure nickel wires, copper tubes, alloy wires, etc. Different types of wires are suitable for different occasions, so you should inquire carefully before purchasing. 

In addition, when selecting a coil, you must also consider its wire diameter, material, temperature and pressure resistance, etc. These are also determined by the conditions of use. In the actual selection process, you must first determine the required equipment power according to the heating requirements, and then you can know its output current value, and then determine the wire diameter and material, and then consider its temperature resistance performance based on the on-site temperature conditions, heat dissipation conditions, etc. If these factors are not taken into consideration when selecting a coil, equipment failure may easily occur, such as the coil being burned out, heating efficiency being low, and the coil not being durable. At least it may affect production, and at worst it may cause personal accidents.

2. Coil winding

On the surface, coil winding seems to be the least technical job. Isn't it just winding wires to form a coil? Who can't do this?

But in fact it is not that simple. The winding of the coil needs to take into account factors such as superposition, interference, heat dissipation, distance, and inductance matching.

Electromagnetic heaters with different powers require different coil inductances. Only when the actual inductance is consistent with the theoretical value can the power of the electromagnetic heater be maximized. For example, the theoretical inductance of a 30KW electromagnetic heater is 240μH. When the coil is wound, its power can fully reach the rated value only when the actual inductance is about 240μH. If the actual inductance is 100μH, 150μH, 300μH, or 400μH, then the actual power used by the device may be only 20KW or 15KW, and it may not even work properly or start at all.

3. Applicable scene

The wide application of electromagnetic heaters determines the complexity of their on-site use. Among the many fields of use of electromagnetic heaters, such as food, plastics, chemicals, printing, heating, and garbage disposal, the application scenarios of each industry are different. Even in the same industry, the use site of each customer is also very different. Therefore, the electromagnetic coil does not have universal applicability and is a non-standard accessory with different winding methods for different usage scenarios.

In view of this characteristic of the coil, when selecting a coil, you must first understand your application situation, so that you will not be unable to use it after buying it, or the power is low and impractical, the power consumption is too large, it is not energy-saving, and the use cost is too high. Highly inconsistent with the product description and other issues.