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Demands Made on the Enameled Wire and Methods of Testing


Test the finished product line with a fair amount of pe […]

Test the finished product line with a fair amount of performance. The uniformity of the enamel layer is very important for the enameled wire for winding applications: the enamel can not show any unevenness or dents, and the thickness must be evenly coated around the copper. Such enameled wires tend to use horizontal machines to make thin enameled wires, one wire per wire, multiple vertical wires for thick wires, and one or more wires at a time.

A vertical machine enamels 16 wires at a time, each wire coated with 6 layers of paint. There are six X16 = 96 slits on the inclined wall of the paint can at the bottom of the machine. Through this slit, the enameled wire is drawn through a roller onto the furnace. A small part of the enamel layer mechanical, electrical and chemical properties are also very important. In these regards, we will mention some of the methods described in the Standard Specification for Enamel Testing.

By passing the wire through the conductive liquid, holes and other large defects in the insulator are detected while voltage is applied between the core and the liquid of the enameled wire. The circuit also contains a resistor, a neon light and a counter. The uniform thickness of the enamel layer is not only related to the insulation resistance, but also due to the fact that some winding methods require very constant enameled wire diameters (with a standard deviation of less than 2%). A fairly straightforward method to test the thickness of the enameled wire is not discussed here. In order to check the lamellar structure of the enamel insulation layer simply and quickly, the wire is placed in a reagent capable of dissolving enamel and placed at an angle of 45 ° for about 1 minute. The oblique cross-section of the enamel is then seen on the wire and the layers clearly visible with the aid of the magnifying glass.

Breakdown voltage is especially important in terms of the electrical properties of the enamel. This can be determined, for example, by winding a length of wire on a polished steel cylinder and applying a gradually increasing voltage between the wire core and the cylinder. Others want to understand the electrical properties of insulation resistance and dielectric loss.