The thermal spray of the motor iron core generally uses symmetrical nozzles on both sides, so that the powder is sprayed on both sides of the preheated workpiece. The workpiece rotates during spraying and the nozzle can be set to 4 or 8 depending on the size of the workpiece.
When sprayed, the symmetrically placed nozzles cause the powder to create a chaotic region, so that the part of the iron core that needs to be sprayed can be in uniform contact with the powder. When coating a long workpiece, the iron core can be moved parallel to the flocculation area.
The spraying equipment requires a stable powder supply system and a powder recovery device to enable the powder to be recycled, and the powder supply system must ensure stable and uniform powder discharge from the nozzle. The air flow should be small to avoid the non-uniformity of the coating caused by blowing cold workpieces. The equipment should be equipped with powder automatic metering and feeding devices.
For smaller air volume and uniform powder supply. A venturi-like cross joint powder supply system was developed. The cross joint is placed in a fluidized bed. When compressed air is introduced into the cross joint, powder in the fluidized bed is attracted from the suction tube of the joint to the nozzle due to the vacuum suction action. Through a good combination of valves, tubes, crosses, and nozzles, it is possible to achieve very stable air supply by regulating very small air flows. Thermal spraying for the insulation coating of small motor cores has the following advantages:
(a) greatly simplifies the issue of shelter protection. When spraying, the powder can be controlled not to be sprayed on the part that does not need to be powdered, and the peripheral covering jig is dispensed with.
(b) The covering effect of the corners is better than that of the fluidized bed. The coverage of the corners coated by the fluidized bed is generally about 40% to 55%, while the thermal spraying method can reach 60% or more.
(3) High production efficiency and easy realization of automated production. This method is particularly suitable for a "flat" core with a small thickness, but for a long core, the coating in the groove is not easily coated evenly.
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