Enameled wire is the most widely used electromagnetic wire in the production of low-voltage products. A key performance requirement of this electromagnetic wire is the continuity of the paint film, which means checking the number of pinholes in the paint film under a certain length. When checking the number of pinholes, use a professional paint film continuity tester. The fewer the number of pinholes, the better the integrity of the paint film of the electromagnetic wire.
The detection of pinhole defects adopts the principle of high-pressure leakage. The electromagnetic wire is contacted with a concave wheel that is applied with high voltage in a semi-enveloping manner. When the thickness of the paint film is insufficient or there are serious bare copper defects, the instrument will record the specific Number of defects.
The causes of this defect can basically be divided into two categories. One is the unsuitability of the copper material, that is, the molded wire core has more burrs, which may be caused by the raw material itself or the drawing process; the other reason may be It is caused by uneven painting, impurities in the paint, the quality of the paint itself, and drying after painting.
As a motor manufacturer, you should pay special attention to this performance, because this defect can easily lead to inter-turn faults in the motor, seriously affecting the service life of the motor.