How to check the quality of iron core?

The iron core is an important part of the motor, and the core functions as the magnetic conductor of the motor. In addition to the core affecting the workmanship and insulation reliability of the motor insert, the core material and manufacturing standards also have an impact on the excitation current, iron consumption, stray losses, and other factors that affect the efficiency and temperature rise of the motor. Therefore, the manufacturing quality of iron cores should be strictly regulated. The following are the procedures for core quality inspection.

1. Dimensional and cosmetic evaluation

The appearance inspection is generally done by visual inspection to determine whether the core is neat, whether there are obvious signs of polished or repaired, whether the welds and fasteners are beautiful and firm, whether the slots are smooth and neat without sticking out of the wrong piece, whether the slots can be touched to determine whether they are inverted and blunt or sharp, etc. The core size can be measured with the corresponding gauge, and the groove size is generally tested with a special through stop slot sample rod.

2. Stacking coefficient detection 

The stacking coefficient itself is a parameter that is not very easy to measure directly and is mainly guaranteed by the stacking pressure, so the core stacking is a special process that requires special process confirmation. Once the core is manufactured, it is difficult to reproduce the stacking pressure, so there is no way to know the stacking coefficient. Although there are some indirect measurement methods in the relevant standards, such as the pinprick method, etc., but most of these measurement methods are not very reliable, measurement errors and subjective factors are large. In comparison, the weighing method is a more reliable method. When using this method should first start from the special process confirmation, first in the technical, inspection and other relevant personnel on site witness, in strict accordance with the design requirements of the material, the process and process parameters after verification of the process operation, the conditions allow more qualified samples, and then accurately weighed, the precise weight of qualified samples, later acceptance on the basis of this weight, and then given a reasonable tolerance As a discriminatory standard, the superposition coefficient of the batch of cores can be randomly or fully inspected by the weighing method.

The above is the Vshida micro-motor on the quality of the iron core how to test the explanation, I hope it will help you, for more information about the welcome to consult us at any time