What is the reason that the insulating varnish flakes off after the motor winding is dipped in paint?
Dip paint, is an important part of the winding insulation process, dip paint winding, after the necessary drying process, through the insulating varnish so that the electromagnetic wire and other materials, bonding, curing as a whole, so as to ensure that the winding insulation and mechanical properties in line with the requirements.
However, in the actual operation process, from time to time, the insulating varnish flakes off, that is, the insulating varnish bonding and fusion is not good.
About this problem, in the motor surface spraying process will also be encountered, the more common is the casting surface of the antirust paint and spray surface paint reaction, blistering and flaking; and motor winding dipping paint drying, the insulating paint is in a brittle state, that is, it is very easy to be separated from the winding, the winding naturally can not become a solid whole.
In addition to the quality of the insulating varnish itself, the manufacturing process of some bad conditions, may also lead to insulating varnish can not be attached, such as the operation process of oily substances contaminated to the winding, this problem and the motor surface sticking to the surface of the grease, the surface of the varnish can not be adhered to the situation is similar.
Those who have been involved in the inspection and treatment of motors with winding faults can find that the insulating varnish is crispy when the winding is burnt locally or in its entirety because of electrical faults, which shows that high temperature is an important factor leading to the flaking of the insulating varnish.
In the actual operation of the motor, when the motor winding temperature rise is high, it will lead to the deterioration of all the insulating materials of the motor winding, after the insulating varnish is brittle, the winding will be loose, and the overall insulating performance deteriorates at the same time, the motor will also vibrate and noise when running, which seriously affects the reliability of the motor.
Therefore, for the dipping paint process control of the winding, on the one hand, to ensure that the dipping paint process of the motor meets the requirements and is strictly enforced, and on the other hand, to ensure that the related process meets the requirements, especially for the application of the temperature rise level of control and consideration.
