Thermosetting electromagnetic coil for refueling equipment 210D-8

What are the common electromagnetic coil test items?

The test items of electromagnetic coil mainly include electrical strength, resistance measurement, turn-to-turn, temperature rise, high and low temperature, long-term electrification, salt spray and so on.

1. Electrical strength test:

Electrical strength test is also called withstand voltage test.

2, turn to turn:

A intersecting circumference formed by a copper wire is called a turn, an independent individual formed by multiple turns is called a circle, and the circle is also called an inter-turn.

3, high and low temperature test:

It is used to confirm the adaptability of products in storage, transportation and use under the conditions of temperature, humidity and climate.

4, salt spray test:

It is an environmental test to evaluate the corrosion resistance of products or metal materials by artificially simulating salt spray environmental conditions created by salt spray test equipment.

Why high-frequency inductance coil usually passes through the conductor with multi-strand insulated wire alternating current, the current density of each part is uneven, the current density inside the conductor is small, and the current density outside the conductor is large, which is called skin effect. The higher the frequency of alternating current, the more obvious the skin effect is, and the frequency is high enough to think that the current completely flows through the conductor surface. Therefore, in high-frequency AC circuits, it is necessary to consider the influence of skin effect. For example, the coil on the radio magnetic antenna is wound with multiple insulated wires, and the outdoor antenna of TV is made of metal tube with larger diameter instead of metal rod, all of which are examples to increase the surface area of conductor and overcome the unlucky influence caused by skin effect.