1. PouringWhen pouring, place the stator vertically on the paint dripping tray with one end of the winding facing upward, and use a paint pot or paint brush to pour paint on the upper end of the winding. When the winding gap is filled with paint and begins to seep out from the gap at the other end, turn the stator over and pour paint on the winding at the other end until it is fully poured.
2. Drip leaching
①Formula. 6101 epoxy resin (mass ratio), 50% tung oil maleic anhydride.
②Preheating: Heat the winding for about 4 minutes, and control the temperature between 100 and 115°C (measured with a spot thermometer), or place the winding in a drying furnace and heat it for about 0.5 hours.
③Drip. Place the motor stator vertically on the paint tray, and start dripping paint manually when the motor temperature drops to 60-70℃. After 10 minutes, turn the stator over and drip paint on the other end of the winding until it is thoroughly soaked.
④Curing. After dripping, the winding is energized for curing, and the winding temperature is maintained at 100-150°C; the insulation resistance value is measured until it is qualified (20MΩ), or the winding is placed in a drying furnace for heating at the same temperature for about 2 hours (depending on the size of the motor), and it is taken out of the oven when the insulation resistance exceeds 1.5MΩ.
3. Roller paintThis method is suitable for the varnishing of medium-sized motors. When rolling the paint, pour the insulating paint into the paint tank, place the rotor in the paint tank, and the paint surface should immerse the rotor winding for more than 200mm. If the paint tank is too shallow and the area of the rotor winding immersed in the paint is small, the rotor should be rolled several times, or the paint should be applied with a brush while the rotor is rolled.
4. ImmersionWhen repairing small and medium-sized motors in batches, the windings can be immersed in paint. When immersing, first put a proper amount of insulating paint into the paint can, then hang the motor stator in, so that the paint liquid submerges the stator by more than 200mm. When the paint liquid penetrates all the gaps between the windings and the insulating paper, the stator is lifted up and the paint is dripped. 0.3~0.5MPa pressure is added during the immersion.
5. Vacuum pressure immersionThe windings of high-voltage motors and small and medium-sized motors with high insulation quality requirements can be subjected to vacuum pressure dipping. During dipping, the stator of the motor is placed in a closed paint container and moisture is removed using vacuum technology. After the windings are dipped in paint, a pressure of 200 to 700 kPa is applied to the paint surface to allow the paint liquid to penetrate into all gaps in the windings and deep into the pores of the insulating paper.
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Company Name: Anhui Mingteng Permanent-Magnetic Machinery & Electrical Equipment Co., Ltd.
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Country: China
Website: https://www.mingtengmotor.com/