A detection method for coil damage

Abstract

The invention discloses a coil damage detection method, which comprises winding an enameled wire to be detected into a coil; connecting the coil to a detection power source and energizing the coil to generate heat; The thermal image of the coil; judge the damage position of the coil according to the thermal image; if the thermal image presents the same color, there is no damage to the coil; if the thermal image presents different colors, then The position of the different colors is determined as the damage position of the coil; not only the operation is convenient, the detection is more accurate, and the scope of application is wider, but also, no chemical reagent or mechanical contact is required to avoid secondary damage to the coil.

Description

technical field [0001] The invention relates to the technical field of coil detection, in particular to a detection method for coil damage. Background technique [0002] At present, a large number of inductive devices, such as transformers and inductors, are used in the motherboards of household appliances such as air conditioners, and a certain proportion of these devices will fail in actual production and use. After preliminary test and analysis, it is found that the failure of transformers, choke coils and other components is related to the insufficient withstand voltage between turns caused by the damage of enameled wires. Among them, the integrity of the paint film of the enameled wire has a certain influence on the reliability of transformers and inductance devices. [0003] Therefore, the application of enameled wire in electrical equipment needs to ensure its insulation performance. However, in the process of making enameled wires into products or semi-finished pro...

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Problems solved by technology

[0008] For example, Chinese invention patent CN 104111275B discloses a method for detecting damage to the insulation layer on the exposed surface of a coil, which includes a detection power supply, a conductive clip, and a conductive bristle bundle. It is connected with a conductive bristle bundle. During detection, the charged bristle bundle is used to brush the coil to be detected. If there is a damaged point in the coil, the damaged point will contact the bristle bundle and cause a sparking phenomenon; on the one hand, this method uses the bristle bundle It is easy to cause damage to the coil; on the other hand, this method judges whether it is damaged by whether it is ignited, which has certain potential safety hazards.

[0009] In summary, the above detection methods all produce chemical or mechanical contact to the coil, which is likely to cause secondary damage to the coil; moreover, the operation methods are more complicated and the detection efficiency is low

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