Today, stator impregnation machines are in great demand in the engine manufacturing industry. Initially developed in the late 1970s, these machines were manufactured to serve a wide range of electric motor manufacturers, especially in sectors such as servo, industrial alternator, aerospace, induction, fractional, and brushed / brushless stepper and universal motors. brushes. One of the most popular methods in the industry today is drip impregnation which is used for both rotors and stators.

With the drip impregnation method, the stator windings and armature components are coated with epoxy resin. The process begins with preheating the windings and dispensing a calculated amount of resin. It is then heated to a certain temperature to “cure” the resin.

Manufacturing involves positioning and clamping components horizontally on self-centering mandrels. The mandrels continuously rotate the components on their central axis as they are transported through the different steps of the drip impregnation process. The process includes component preheating, epoxy resin dripping, gelling, and polymerization to cure the resin and finally cool. Rotation speed depends on factors such as component size, process requirements, etc. Speed ​​plays an important role since it is what decides the good penetration of the resin. The whole process is controlled electronically. The dripping and gelling phases play a crucial role and therefore special attention should be paid to this process.

The impregnation area is composed of more than one deception station that has a series of drippers strategically aligned in the areas to be impregnated for greater precision. There are many pumps that force the resin flow through the drippers. The fundamental principle of application is through the capillary principle. Stator impregnation machines are designed for precise control while impregnating the resin in terms of volume, rotation speed of parts, time and temperature. This allows maximum precision in the application of the resin and ensures optimal absorption. The capillary principle also ensures the least resin waste during the drip impregnation process.

The drip method is generally used in all products where thermodynamic stress is of great importance. The main advantages of this system are high-quality impregnation, no need to rework after completion of the process, extremely high bond strength, high productivity, and shorter processing time. The resins used can be without or with monomers.

The machines are designed to be easy to use, flexible and environmentally friendly, with the utmost importance being placed on safety and reliability. The design of the heating system ensures energy-saving performance by the machine. The PLC controls all the impregnation parameters. When different products need to be impregnated, specific parameters can be set for each component based on the following factors:

• Rotation speed required for the specific component

• Drip time depending on the season

• Resin pump speed

• Position of the drippers in different stations

An ideal drip system should be able to function optimally when using any type of coating material. Some of the different coating materials used are traditional polyester, epoxy resin, solvent-free polyester or epoxy-phenolic resins, etc.