Insulation Of Round Enameled Copper Wire

The insulation performance of enameled wire is related to temperature!

Let me talk about the state of polymer materials first-the paint film of the Round Enameled Copper Wire is a polymer material:

As the temperature increases, the polymer will experience three states of matter: glassy, highly elastic, and viscous fluid state. The physical properties of the three states are as follows:

Glassy state: rigid solid

High elasticity: rubber-like solid, good elasticity

Viscous flow state: fluid with fluidity

In the test of enameled wire, there is a property called softening breakdown (a similar test in the United States is called thermoplastic flow), which is mainly to assess the high temperature that the enameled wire paint film can withstand. If it exceeds a certain temperature, the paint film will soften into a viscous fluid state-it can flow like syrup.

After the enameled wire is used (wound into a motor or transformer, etc.), there is a certain stress or pressure between the wires. If the temperature of the paint film is very high, the paint film is in a viscous state. The paint film between one of the pressure paint films and the paint film will be forced to flow in other directions due to pressure, resulting in thinning of the insulating layer, resulting in insulation decline.

If the temperature drops again, the paint film will drop from a viscous flow state to a highly elastic state, and then return to a glass state, thereby recovering better insulation properties. However, there may also be a certain degree of decline. The main reason is that the pressure causes the paint film to flow, which makes the paint film eccentric and thins the insulation thickness.

Another prerequisite is that the insulation is not damaged under high temperature conditions, that is, there is no breakdown. If the insulation has been damaged, the damaged point remains irreversible after the temperature drops.

Motor enameled wire (among which: B; F grade commonly used)

1. Acetal enameled wire; Class E

2. Polyester enameled wire: Class B

3. Modified polyester enameled wire: Class F

4. Modified polyester imine enameled wire: Class H

5. Amide-imide enameled wire: Grade C

Different insulation grades represent different insulation materials of the motor, and the difference in heat resistance is also the allowable temperature rise. For example: Class B temperature rise allows 80K; Class F allows 100K; Class H allows 125K (all measured by resistance method). At present, the A.E level has been basically eliminated.
The effects of Rectangular Enameled Copper Wire and Round Enameled Copper Wire are the same, and the judgment situation can also be applied to the same situation.

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