Micro motors, characterized by their small size and high power output, find widespread applications in household appliances, automotive, medical devices, and various other fields. To enhance the performance and lifespan of micro motors, a core coating process is employed. Here, we outline the core coating process for conventional direct current (DC) micro motors:
1. Pre-treatment: The surface of the core must undergo cleaning and phosphating processes to ensure coating adhesion and corrosion resistance. The cleaning solution consists of deionized water and 4% sodium hydroxide, with an immersion time of 30 minutes. The phosphating solution is a mixture of 1% phosphoric acid and 2% hydrofluoric acid, with an immersion time of 5 minutes.
2. Primer Coating: Select an epoxy primer suitable for DC micro motors. Apply the coating evenly using an automated coating machine, with a thickness ranging from 15μm to 20μm. Cure the primer in an oven for 1 hour at 120°C.
3. Intermediate Coating: Utilize an epoxy amine-acid modified substance with improved adhesion properties. Add curing agent and diluent, mix thoroughly, and spray using a spray gun. The thickness should also be 15μm to 20μm. Cure the intermediate coating in an oven for 1 hour at 120°C.
4. Final Coating: Employ epoxy resin coatings designed to enhance adhesion and wear resistance, similar to the intermediate coating. The thickness remains between 15μm and 20μm. Cure the final coating in an oven for 1 hour at 120°C.
5. Inspection: Conduct tests for coating thickness, adhesion, electrical insulation properties, and other parameters. Once the coatings pass inspection, proceed with tailored cup treatment.
The above-described process is for the core coating of DC micro motors. Depending on the motor's specific model, industry requirements, and application, there may be variations in coating formulation, thickness, curing times, and temperatures. Micro motors produced in factories undergo core coating processes that significantly improve motor performance, extending motor lifespan by up to 20%, and expanding the market scale.
Please note that this process may vary for different motor models and industry requirements.