Paint dripping curing method for insulating paint of flat wire motor

Abstract

The invention discloses a paint dripping and curing method for insulating paint of a flat wire motor, which belongs to the technical field of motor stator manufacturing and comprises the steps of material loading preparation, preheating treatment, positioning and painting, synchronous paint dripping at multiple paint dripping ports, paint dripping at two ends of the flat wire motor, preliminary curing of gel, complete curing of the insulating paint and cooling completion. The insulating paint and the flat wire motor are heated to the same temperature range, so that the insulating paint has sufficient flowability, bubbles in the paint dripping process can be smoothly discharged, cold paint is prevented from directly falling onto the flat wire motor, and the phenomenon that in the traditional paint dripping process, part of the contact surface of the insulating paint and the flat wire motor is not damaged is avoided. And since the temperature difference generation part and area are solidified in advance, bubbles cannot be discharged smoothly.

Description

Technical Field

[0001] The invention belongs to the technical field of motor stator manufacturing, and in particular relates to a method for dripping and curing insulating paint of a flat wire motor for coating a flat wire in a slot body of the flat wire motor with insulating paint. Background Art

[0002] The coils of flat wire motors need to withstand a certain voltage when working. In order to prevent short circuits between coils or between coils and iron cores, which may lead to motor failure, insulating paint coating can form a uniform thin insulating layer, effectively isolating the external medium and improving the insulation performance of the motor. The motor is a high-voltage device. If the coil insulation is poor or damaged by moisture, resulting in insulation breakdown, it may cause serious safety accidents. Insulating paint coating can effectively improve the voltage resistance of the coil and reduce the risk of insulation breakdown.

[0003] Existing new energy vehicle motors primarily use insulating paper to insulate the flat wire windings from the stator core slots. This paper is then impregnated with insulating varnish, which cures to secure the flat wires and create a strong overall structure. However, as the varnish drips, it gradually seeps into the slots through capillary action. As the slot fill rate increases, the gaps within the core slots decrease. While theoretically increasing the capillary penetration effect of the impregnating varnish increases, the shrinking gaps can easily lead to localized blockages due to paint turbulence, microgels, and other factors. This prevents the effective removal of air from the slots, resulting in a decrease in the fill rate.

[0004] In the prior art, the Chinese invention patent with application publication number CN117748868B discloses a paint dripping machine and a paint dripping method for flat wire motor assembly, which relate to the technical field of new energy flat wire motor assembly. The paint dripping machine and the paint dripping method for flat wire motor assembly include a base, a pressing and rotating mechanism for pressing the stator and driving the stator to rotate, a tilting drive mechanism for driving the tilting angle of the pressing and rotating mechanism, and a paint dripping mechanism for dripping paint on the stator on the pressing and rotating mechanism. The pressing and rotating mechanism is movably connected to the output end of the tilting drive mechanism; the pressing and rotating mechanism is rotatably mounted on the base; the pressing and rotating mechanism has a pressing component for pressing the stator, which is movably abutted against the outer wall of the stator; the pressing and rotating mechanism is automatically realized by adopting the pressing and rotating mechanism, meeting the stator limit and angle rotation requirements; the stator is pressed and fixed by adopting the pressing component, which can be applicable to stators with different inner diameters and has a wide range of applications.

[0005] For example, the invention patent with application publication number CN118300300A discloses a method for implementing the winding structure of a flat wire motor, which relates to the technical field of flat wire motors. A winding structure of a flat wire motor, wherein the copper wire welding end of the motor stator is twisted and then the copper wire is cut on the outside of the insulating paint. After cutting, the two copper wire ends at the joint are in the same plane and the sides are in contact with each other, and then the two cut copper wires are welded at the ends to be welded into one; the copper wire after welding is insulated by dripping paint; its main implementation process includes stator core wiring, insulation paper insertion, hairpin wire insertion into the core, copper wire expansion, copper wire twisting, copper wire welding, dripping paint coating insulation, electrical testing, and stator assembly offline.

[0006] However, during the motor insulation varnishing process, bubbles still remain between the slots and flat wires in the motor stator. Furthermore, the insulating varnish coating around the flat wires in the slots is uneven, affecting the quality of the flat wire motor. Therefore, the quality of the insulating varnish coating around the flat wires in the motor stator needs to be further improved to meet the high quality requirements of new energy vehicle motors. Summary of the Invention

[0007] The purpose of the present invention is to overcome the technical problems in the prior art such as the easy generation of bubbles during the coating process of the insulating varnish for flat wire motors, which leads to gaps between the insulating paper and the flat wire, thereby affecting the quality of the flat wire motor, and to provide a dripping paint curing method for the insulating varnish for flat wire motors that can effectively eliminate the gaps between the insulating paper and the flat wire.

[0008] In order to solve the above technical problems, the present invention provides a method for curing the dripping paint of the flat wire motor insulating paint, the method comprising the following steps: Step 1, loading preparation: Install the assembled flat wire motor on the rotary drive device and perform a fixation and rotation test to ensure that the flat wire motor can rotate at a uniform speed on the rotary drive device; Step 2, preheating treatment: The entire flat wire motor and the rotary drive device are moved to the preheating furnace by a moving device for uniform heating to reach a preset heating temperature, and the insulating paint is heated to above the dripping temperature; the flat wire motor is driven by the conveyor device into the preheating furnace, and the preheating furnace heats the flat wire motor. In order to ensure the fluidity of the insulating paint on the surface of the flat wire motor and reduce bubbles during the curing process of the insulating paint, the flat wire motor needs to be preheated before dripping the paint. The preheating is usually carried out in the form of a preheating furnace. The conveyor device drives the flat wire motor into the preheating furnace in sequence to ensure that the surface of the flat wire motor is evenly heated, which is conducive to the surface accepting the insulating paint; Step 3, Positioning and Painting: After preheating, the flat wire motor is transported to the paint dripping station by the conveyor. The tilt control device tilts one end of the flat wire motor and the rotary drive device to a predetermined angle so that the flat wire end of the flat wire motor is in the loading area of ​​the paint dripping equipment. The position of the flat wire motor is detected by a distance sensor. After confirming that there is no deviation, the paint dripping equipment is started and the heated insulating paint is added to the material box of the paint dripping equipment. At the same time, a heat preservation device is installed in the material box to keep the insulating paint at the dripping temperature. Step 4, synchronous paint dripping from multiple paint dripping ports: the paint dripping equipment is designed with 2-4 paint dripping ports, while ensuring that the paint dripping process is synchronized and accurate; since the flat wires of the flat wire motor are staggered, there are gaps between the flat wires, and multiple paint dripping ports are set at different positions to ensure that the insulating paint is evenly and completely coated, and each paint dripping port includes an outer diameter paint dripping port and an inner diameter paint dripping port, which correspond to the outer diameter area and inner diameter area of ​​the flat wire of the flat wire motor respectively. The rotary drive device is started to drive the flat wire motor to rotate, so that the insulating paint is evenly dripped on the inner and outer surfaces of one end of the flat wire of the flat wire motor, and the insulating paint flows from the inner and outer sides of the flat wire of the flat wire motor into the slot body of the flat wire motor, covers the outer surface of the flat wire in the slot body of the flat wire motor and fills the gap between the flat wire and the slot body, until the insulating paint flows out from the other end, the paint dripping port stops dripping, and the insulating paint flows from the inner and outer sides of the flat wire of the flat wire motor into the slot body of the flat wire motor, covers the outer surface of the flat wire in the slot body of the flat wire motor and fills the gap between the flat wire and the slot body; Step 5: Paint is dripped on both ends of the flat wire motor. The tilt control device tilts the other end of the entire flat wire motor and the rotation drive device to a predetermined angle. The tilt angle is changed and step 4 is repeated to drip paint on the outer diameter and inner diameter of the flat wire at the other end of the flat wire motor until the entire flat wire motor is painted. Step 6, preliminary curing of the gel: After the paint dripping operation is completed, the mobile device moves the flat wire motor to the gel area. In the gel area, a dehumidifier is used to reduce the humidity to below the predetermined humidity. The flat wire motor is then heated by a heating device to reach the gel temperature, causing the insulating paint to quickly enter a gel state, and a preliminary insulating paint base layer is formed on the contact surface between the insulating paint and the flat wire coil. The heating device heats the flat wire motor, causing the insulating paint to quickly enter a gel state, and a preliminary insulating paint base layer is formed. Step 7, complete curing of the insulating paint: After the gel step is completed, the flat wire motor is sent to the curing area by a moving device, and the temperature is increased in the curing area to reach the curing temperature, so that the insulating paint is completely cured on the basis of the insulating paint base to form an insulating layer; Step 8, Cooling Complete: After the insulating varnish has cured, the flat-wire motor is moved to a cooling zone via a mobile device. Within the cooling zone, the motor is rapidly cooled to a safe operating temperature through natural cooling or forced air cooling. After cooling is complete, the motor is ready for subsequent processing or packaging for shipment. Natural cooling significantly increases the fill rate within the motor's flat-wire slots, reduces the gaps between the flat wire and the insulating paper, and prevents the formation of bubbles in the insulating varnish, thereby improving product quality and reducing operating noise.

[0009] As a further improvement measure of the present invention, in the above step 2, after the flat wire motor enters the preheating furnace, the temperature of the flat wire motor is raised to 70-120° C., and the preheating time is 40-70 minutes.

[0010] As a further improvement measure of the present invention, in the above-mentioned step 2, the insulating varnish is heated to a dripping temperature of 70-100°C. At the same time, the insulating varnish is preheated to a temperature close to that of the flat wire motor, so that the temperature difference between the insulating varnish and the flat wire coil is small when they come into contact, and the insulating varnish flows smoothly. This avoids the temperature difference between the two, which may cause a large temperature difference in some areas during the flow of the insulating varnish, causing bubbles to form inside and preventing them from flowing out smoothly, thereby reducing the quality of the insulating varnish.

[0011] As a further improvement measure of the present invention, in the above step 3, when the flat wire motor is located at the paint dripping station, the above predetermined angle is 5-15 degrees.

[0012] As a further improvement measure of the present invention, in the above step 4, the outer diameter paint dripping port and the inner diameter paint dripping port of each paint dripping port are synchronously and symmetrically arranged on both sides of the flat wire coil, and the paint dripping ports are arranged in a centrally symmetrical manner.

[0013] As a further improvement measure of the present invention, in the above step 4, the rotation driving device sets the rotation speed of the flat wire motor to 8-15 rad / min.

[0014] As a further improvement measure of the present invention, in the above steps 4 and 5, the temperature of the flat wire motor is maintained at 75° C.-115° C., and the flat wire motor is heated and supplemented with temperature after the paint dripping at one end of the flat wire motor is completed.

[0015] As a further improvement measure of the present invention, in the above step 6, the gelling temperature of the gelling zone is set to 115° C.-145° C., the gelling time is 4-10 minutes, and the above predetermined humidity is 50%.

[0016] As a further improvement measure of the present invention, in the above-mentioned step 7, the above-mentioned curing temperature is 160° C.-180° C., and the curing time is 55-95 minutes.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention heats the insulating paint and the flat wire motor to the same temperature range, so that the insulating paint has sufficient fluidity, so that bubbles in the paint dripping process can be discharged smoothly, avoiding directly dropping cold paint onto the flat wire motor, and avoiding the problem that in the traditional paint dripping process, some contact surfaces of the insulating paint and the flat wire motor are partially solidified in part and area due to temperature difference, thereby causing bubbles to be unable to be discharged smoothly; 2. The present invention adopts a complete process flow of preheating, paint dripping, gelling and curing to ensure sufficient filling and uniform coating of the insulating paint, further improving product quality; 3. The design of multiple paint dripping ports realizes comprehensive, efficient and uniform coating of the flat wire motor, significantly improving the coating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0020] Example 1: Figure 1 As shown, this embodiment details a method for curing the insulating varnish of a flat wire motor. This method ensures that the insulating varnish is evenly coated and completely cured on the flat wire motor by precisely controlling the parameters of each step, thereby improving product quality. The specific implementation steps are as follows: Step 1: Loading Preparation. The assembled flat wire motor is mounted on the rotary drive unit and tested for fixation and rotation. First, a pneumatic clamp is used to secure the motor flange to ensure accurate axial and radial positioning. Next, a low-speed rotation test is initiated at 10±2 rad / min, with the speed stability monitored using an encoder. Finally, after confirming the absence of abnormal vibration, the system automatically records the motor ID information and uploads it to the database. These steps ensure that the flat wire motor rotates at a constant speed on the rotary drive unit, providing a stable foundation for subsequent paint application.

[0021] Step 2: Preheating. To ensure the fluidity of the insulating varnish on the flat-wire motor surface and reduce bubbles during the curing process, the flat-wire motor must be preheated before coating. This is typically done in a preheating oven. A moving device moves the entire flat-wire motor and the rotary drive unit into the preheating oven for uniform heating. The preheating time is 40 minutes, raising the flat-wire motor temperature to 70°C. This ensures uniform heating of the motor surface, facilitating the absorption of the insulating varnish. Simultaneously, the insulating varnish is heated to a coating temperature of 70°C, close to the temperature of the flat-wire motor. This minimizes the temperature difference between the insulating varnish and the flat-wire coil, ensuring smooth coating flow. This operation increases the surface temperature of the flat-wire motor, enhances the fluidity of the insulating varnish, and reduces bubbles during curing.

[0022] Step 3: Positioning and Painting. After preheating, the flat wire motor is transported by the conveyor to the paint dispensing station. A tilt control device tilts one end of the flat wire motor and the rotary drive device to a predetermined angle of 5 degrees, placing the flat wire end of the flat wire motor in the loading area of ​​the paint dispensing equipment. A distance sensor detects the position of the flat wire motor. Once the motor is properly positioned, the paint dispensing equipment is activated and heated insulating paint is added to the paint dispensing equipment's material bin. An insulation device is installed inside the bin to maintain the insulating paint at the desired temperature.

[0023] Step 4: Synchronous paint dripping from multiple paint dripping ports. The paint dripping equipment is designed with two paint dripping ports. Because the flat wire motor's flat wires are staggered, gaps exist between them. Multiple paint dripping ports are located at different locations to ensure uniform and complete coating of the insulating paint. Each port includes an outer diameter paint dripping port and an inner diameter paint dripping port, corresponding to the outer and inner diameter regions of the flat wire motor's flat wires, respectively. The outer and inner diameter paint dripping ports of each paint dripping port are synchronously and symmetrically positioned on either side of the flat wire coil. The paint dripping ports are arranged in a centrally symmetrical manner, ensuring a synchronized and precise paint dripping process. The rotary drive device is activated, driving the flat wire motor at a speed of 8 rad / min. Insulating paint drips evenly onto the inner and outer surfaces of one end of the flat wire motor's flat wire. The insulating paint flows from the inner and outer sides of the flat wire motor into the slot body, coating the outer surface of the flat wire within the slot body and filling the gap between the flat wire and the slot body until the insulating paint flows out of the other end, at which point the paint dripping port stops dripping. During the paint dripping process, the temperature of the flat wire motor is maintained at 75°C, and the flat wire motor is heated and supplemented after the paint dripping at one end of the flat wire motor is completed.

[0024] Step 5: Paint both ends of the flat wire motor. The tilt control device tilts the other end of the flat wire motor and the rotary drive device to a predetermined angle of 5 degrees. Repeat the paint-painting operation in step 4 to paint the outer and inner diameters of the flat wire at the other end of the flat wire motor until the entire flat wire motor is painted.

[0025] Step 6: Initial gel curing. After the paint application is complete, the mobile device moves the flat wire motor to the gelling area. A dehumidifier is used to reduce the humidity to 50% for four minutes. The flat wire motor is then heated to a gelling temperature of 115°C, causing the insulating paint to quickly gel and forming a preliminary base coat on the contact surface between the paint and the flat wire coil. This heating process causes the insulating paint to quickly gel, initially forming a base coat.

[0026] Step 7: The insulating paint is completely cured. After the gel step is completed, the flat wire motor is sent to the curing area by a mobile device, and heated in the curing area to reach a curing temperature of 160°C and a curing time of 55, so that the insulating paint is completely cured on the basis of the insulating paint base to form an insulating layer.

[0027] Step 8: Cooling is complete. After the insulating varnish has cured, the flat wire motor is moved to a cooling zone using a mobile device. Within the cooling zone, the motor is rapidly cooled to a safe operating temperature through natural cooling or forced air cooling. After cooling is complete, the motor is processed or packaged for shipment. Natural cooling significantly increases the fill rate within the motor's flat wire slots, reduces gaps between the flat wire and the insulating paper, and prevents the formation of bubbles in the insulating varnish, thereby improving product quality and reducing operating noise.

[0028] Example 2: This example describes in detail a method for curing the insulating varnish of a flat-wire motor. This method ensures that the insulating varnish is evenly coated and completely cured on the flat-wire motor by precisely controlling the parameters of each step, thereby improving product quality. The specific implementation steps are as follows: Step 1: Loading Preparation. Select a small flat wire motor and install the assembled motor on the rotary drive unit for mounting and rotation testing. First, use a pneumatic clamp to secure the motor flange end to ensure accurate axial and radial positioning. Measurements show a maximum axial positioning error of ±0.04mm and a maximum radial positioning error of ±0.02mm. Next, initiate a low-speed rotation test, setting the speed to 10 rad / min. A high-precision encoder is used to continuously monitor the speed for 10 minutes, ensuring that the speed fluctuation is within ±0.4 rad / min. Speed ​​stability is also verified using the encoder. Finally, after confirming the absence of abnormal vibration, the system automatically records the motor ID information and uploads it to the database. These steps ensure that the flat wire motor rotates at a constant speed on the rotary drive unit, providing a stable foundation for subsequent paint application.

[0029] Step 2: Preheating. Use a mobile device to move the flat wire motor and rotary drive unit to a preheating furnace for uniform heating. The preheating furnace uses infrared heating. Raise the flat wire motor to 90°C at a rate of 8°C / min for 55 minutes. Simultaneously, heat the insulating varnish to 87°C, maintaining a ±3°C temperature differential with the flat wire motor. During the preheating process, monitor the temperature every 5 minutes using an infrared thermometer.

[0030] Step 3: Positioning and Painting. After preheating, the flat wire motor is transported by a conveyor to the paint dispensing station. A tilt control device tilts one end of the flat wire motor and the rotary drive unit to 10 degrees, positioning the flat wire end of the motor within the paint dispensing equipment's loading area. A high-precision distance sensor detects the flat wire motor's position. Once the motor is properly positioned, the paint dispensing equipment is activated and heated insulating paint is added to the paint dispensing equipment's feed tank. An insulation device is installed within the tank to maintain the insulating paint's temperature at 85°C ± 2°C.

[0031] Step 4: Paint is dripped synchronously from multiple paint dripping ports. The paint dripping equipment is designed with three paint dripping ports to ensure a synchronized and precise paint dripping process. Each paint dripping port includes an outer diameter paint dripping port and an inner diameter paint dripping port, corresponding to the outer and inner diameter areas of the flat wire motor, respectively. The outer diameter paint dripping port has a diameter of 2 mm, and the inner diameter paint dripping port has a diameter of 1 mm. The paint dripping ports are arranged symmetrically. The rotary drive device is activated to drive the flat wire motor at a speed of 10 rad / min. The flow rate of the outer diameter paint dripping port is controlled at 15 ml / min, and the flow rate of the inner diameter paint dripping port is controlled at 8 ml / min. Insulating paint drips synchronously from the paint dripping ports, evenly covering the inner and outer surfaces of one end of the flat wire motor and flowing into the tank. During the paint dripping process, the flat wire motor temperature is monitored every minute with an infrared thermometer to maintain a temperature of 85°C. After paint dripping is completed on one end, the flat wire motor is heated for a supplementary temperature of 6 minutes.

[0032] Step 5: Paint both ends of the flat wire motor. Use the tilt control device to tilt the other end of the flat wire motor and the rotary drive device to 8 degrees. Repeat the paint-painting process in Step 4, painting the outer and inner diameters of the flat wire on the other end of the flat wire motor until the entire motor is painted. Maintain the flat wire motor temperature at 95°C during the paint-painting process. After painting one end of the flat wire motor, heat the motor to compensate for the temperature increase.

[0033] Step 6: Initial gel curing. After the paint application is complete, the mobile device moves the flat wire motor to the gelling area. A dehumidifier is used to reduce the humidity in the gelling area to 50%. A heating device is used to raise the temperature of the flat wire motor to a gelling temperature of 120°C at a rate of 6°C / min. The gelling time is set to 8 minutes, allowing the insulating paint to quickly gel and initially form a base coat of insulating paint on the contact surface between the insulating paint and the flat wire coil.

[0034] Step 7: Completely cure the insulating varnish. After the gelling step is complete, the mobile device moves the flat wire motor into the curing zone, where the temperature is raised to 170°C at a rate of 4°C / min. The curing time is set to 70 minutes, allowing the insulating varnish to completely cure on top of the base coat, forming an insulating layer.

[0035] Step 8: Cooling is complete. After the insulating varnish has cured, the mobile device moves the flat wire motor to the cooling area. Natural cooling is used, and after 40 minutes of cooling at an ambient temperature of 25°C, the temperature drops to 52°C. After cooling, testing shows a 4% gap between the flat wire and the insulating paper, and operating noise is 46dB, meeting product quality requirements. The motor is then packaged and shipped.

[0036] Example 3: This example describes in detail a method for curing the insulating varnish of a flat-wire motor. This method ensures that the insulating varnish is evenly coated and completely cured on the flat-wire motor by precisely controlling the parameters of each step, thereby improving product quality. The specific implementation steps are as follows: Step 1: Loading Preparation. A large flat wire motor is selected and assembled, mounted on a rotary drive unit for mounting and rotation testing. First, the motor flange is secured with a pneumatic clamp to ensure accurate axial and radial positioning. Measurements show a maximum axial positioning error of ±0.06mm and a maximum radial positioning error of ±0.04mm. Next, a low-speed rotation test is initiated, setting the speed to 12 rad / min. A high-precision encoder is used to continuously monitor the speed for 10 minutes, ensuring that the speed fluctuation is within ±0.5 rad / min. Speed ​​stability is also verified using the encoder. Finally, after confirming the absence of abnormal vibration, the system automatically records the motor ID information and uploads it to a database. These steps ensure that the flat wire motor rotates at a constant speed on the rotary drive unit, providing a stable foundation for subsequent paint application.

[0037] Step 2: Preheating. Use a mobile device to move the flat wire motor and rotary drive unit to a preheating furnace for uniform heating. The preheating furnace uses a combination of hot air circulation and electric heating. The flat wire motor is heated to 105°C at a rate of 12°C / min for 70 minutes. Simultaneously, the insulating varnish is heated to 100°C, with the temperature difference between the insulating varnish and the flat wire motor controlled within ±5°C. During the preheating process, the temperature is monitored every three minutes using an infrared thermometer.

[0038] Step 3: Positioning and Painting. After preheating, the conveyor transports the flat wire motor to the paint dispensing station. The tilt control device then tilts one end of the flat wire motor and the rotary drive unit to 15 degrees, aligning the flat wire end of the motor with the paint dispensing equipment's loading area. A high-precision distance sensor detects the flat wire motor's position, confirming no deviation, and then activates the paint dispensing equipment. The heated insulating paint is added to the paint dispensing equipment's feed bin, where an insulation device maintains the paint dispensing temperature at 105°C ± 2°C.

[0039] Step 4: Paint is dripped synchronously from multiple paint dripping ports. The paint dripping equipment is designed with four paint dripping ports to ensure a synchronized and precise paint dripping process. Each paint dripping port includes an outer diameter paint dripping port and an inner diameter paint dripping port, corresponding to the outer and inner diameter areas of the flat wire motor, respectively. The outer diameter paint dripping port has a diameter of 4mm, and the inner diameter paint dripping port has a diameter of 2.5mm. The paint dripping ports are arranged symmetrically. The rotary drive device is activated to drive the flat wire motor at a speed of 15 rad / min. The flow rate of the outer diameter paint dripping port is controlled at 25 ml / min, and the flow rate of the inner diameter paint dripping port is controlled at 12 ml / min. Insulating paint drips synchronously from the paint dripping ports, evenly covering the inner and outer surfaces of one end of the flat wire motor and flowing into the tank. During the paint dripping process, the flat wire motor temperature is monitored every minute with an infrared thermometer and maintained at 115°C. After paint dripping is completed on one end, the flat wire motor is heated for a supplementary temperature of 8 minutes.

[0040] Step 5: Paint both ends of the flat wire motor. Use the tilt control to tilt the other end of the flat wire motor and the rotary drive unit to 12 degrees. Repeat the paint-painting process in Step 4, applying paint to the outer and inner diameters of the flat wire on the other end of the motor until the entire motor is painted. Maintain the flat wire motor temperature at 110°C during the paint-painting process. After painting one end of the motor, heat the motor to compensate for the temperature increase.

[0041] Step 6: Initial gel curing. After the paint application is complete, the mobile device moves the flat wire motor to the gelling area. A dehumidifier is used to reduce the humidity in the gelling area to 50%. A heating device is used to raise the temperature of the flat wire motor to a gelling temperature of 135°C at a rate of 8°C / min. The gelling time is set to 10 minutes, allowing the insulating paint to quickly gel and initially form a base coat of insulating paint on the contact surface between the insulating paint and the flat wire coil.

[0042] Step 7: The insulating varnish is completely cured. After the gelling step is complete, the mobile device transports the flat-wire motor into the curing zone. The temperature in the curing zone is raised to 175°C at a heating rate of 5°C / min. The curing time for large flat-wire motors is set at 85 minutes.

[0043] Step 8: Cooling is complete. After curing, the mobile device moves the flat wire motor to the cooling area. Forced air cooling is employed using an axial flow fan at a speed of 4.5 m / s. After 28 minutes of cooling, the temperature drops to 53°C. Post-cooling testing reveals a 4.5% air gap between the flat wire and the insulating paper, and an operating noise level of 48 dB, meeting product quality requirements. The motor then proceeds to subsequent processing steps.

[0044] The present invention heats the insulating paint and the flat wire motor to the same temperature range, so that the insulating paint has sufficient fluidity, so that bubbles in the paint dripping process can be discharged smoothly, avoiding the direct drop of cold paint onto the flat wire motor, and avoiding the problem that in the traditional paint dripping process, part of the contact surface of the insulating paint and the flat wire motor is partially and regionally solidified in advance due to the temperature difference, thereby preventing the bubbles from being discharged smoothly; a complete process flow of preheating, paint dripping, gelling and curing is adopted to ensure sufficient filling and uniform coating of the insulating paint, further improving product quality; a design of multiple paint dripping ports is adopted to achieve comprehensive, efficient and uniform coating of the flat wire motor, significantly improving the coating effect.

[0045] The above describes the embodiments of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. A person skilled in the art may make several modifications and improvements without departing from the present invention, and these should also be considered to fall within the scope of protection of the present invention.

Claims

1. A method for curing the insulating paint of a flat wire motor, characterized by: The method comprises the following steps: Step 1, loading preparation: Install the assembled flat wire motor on the rotary drive device and perform a fixation and rotation test to ensure that the flat wire motor can rotate at a uniform speed on the rotary drive device; Step 2, preheating treatment: Move the entire flat wire motor and rotary drive device to the preheating furnace by a moving device, heat them evenly to the preset heating temperature, and heat the insulating paint to above the dripping temperature; Step 3, Positioning and Painting: After preheating, the flat wire motor is transported to the paint dripping station by the conveyor. The tilt control device tilts one end of the flat wire motor and the rotary drive device to a predetermined angle so that the flat wire end of the flat wire motor is in the loading area of ​​the paint dripping equipment. The position of the flat wire motor is detected by a distance sensor. After confirming that there is no deviation, the paint dripping equipment is started and the heated insulating paint is added to the material box of the paint dripping equipment. At the same time, a heat preservation device is installed in the material box to keep the insulating paint at the dripping temperature. Step 4, synchronous paint dripping from multiple paint dripping ports: The paint dripping equipment is designed with 2-4 paint dripping ports, ensuring that the paint dripping process is synchronized and accurate; each paint dripping port includes an outer diameter paint dripping port and an inner diameter paint dripping port, which correspond to the outer diameter area and inner diameter area of ​​the flat wire of the flat wire motor respectively. The rotary drive device is started to drive the flat wire motor to rotate, so that the insulating paint is evenly dripped on the inner and outer surfaces of one end of the flat wire of the flat wire motor. The insulating paint flows from the inner and outer sides of the flat wire of the flat wire motor into the slot body of the flat wire motor, covers the outer surface of the flat wire in the slot body of the flat wire motor and fills the gap between the flat wire and the slot body, until the insulating paint flows out from the other end and the paint dripping port stops dripping; Step 5: Paint is dripped on both ends of the flat wire motor. The tilt control device tilts the other end of the entire flat wire motor and the rotation drive device to a predetermined angle. The tilt angle is changed and step 4 is repeated to drip paint on the outer diameter and inner diameter of the flat wire at the other end of the flat wire motor until the entire flat wire motor is painted. Step 6: Initial gel curing: After the paint dripping operation is completed, the mobile device moves the flat wire motor to the gel area. In the gel area, a dehumidifier is used to reduce the humidity to below the predetermined level. The flat wire motor is then heated by a heating device to reach the gel temperature, causing the insulating paint to quickly enter a gel state, and forming a preliminary insulating paint base layer on the contact surface between the insulating paint and the flat wire coil. Step 7, complete curing of the insulating paint: After the gel step is completed, the flat wire motor is sent to the curing area by a moving device, and the temperature is increased in the curing area to reach the curing temperature, so that the insulating paint is completely cured on the basis of the insulating paint base to form an insulating layer; Step 8, cooling completion: After the insulating varnish is cured, the flat wire motor is moved to the cooling area by a mobile device. In the cooling area, the flat wire motor is quickly cooled to a safe operating temperature through natural cooling or forced air cooling. After cooling is completed, the flat wire motor is processed in subsequent steps or packaged for shipment.

2. The method for curing the insulating varnish of a flat wire motor according to claim 1, characterized in that: In the step 2, after the flat wire motor enters the preheating furnace, the temperature of the flat wire motor is raised to 70-120° C., and the preheating time is 40-70 minutes.

3. The method for curing the insulating varnish of a flat wire motor according to claim 2, characterized in that: In the step 2, the insulating varnish is heated to a dripping temperature of 70-100°C.

4. The method for curing the insulating varnish of a flat wire motor according to claim 3, characterized in that: In step 3, when the flat wire motor is located at the paint dripping station, the predetermined angle is 5-15 degrees.

5. The method for curing the insulating varnish of a flat wire motor according to claim 4, characterized in that: In step 4, the outer diameter paint dripping port and the inner diameter paint dripping port of each paint dripping port are synchronously and symmetrically arranged on both sides of the flat wire coil, and the paint dripping ports are arranged in a centrally symmetrical manner.

6. The method for curing the insulating varnish of a flat wire motor according to claim 5, characterized in that: In the step 4, the rotation driving device sets the rotation speed of the flat wire motor to 8-15 rad / min.

7. The method for curing the insulating varnish of a flat wire motor according to claim 6, characterized in that: In step 4 and step 5, the temperature of the flat wire motor is maintained at 75° C.-115° C., and the flat wire motor is heated and compensated for the temperature after the paint dripping at one end of the flat wire motor is completed.

8. The method for curing the insulating varnish of a flat wire motor according to claim 7, characterized in that: In step 6, the gelling temperature of the gelling zone is set to 115° C.-145° C., the gelling time is 4-10 minutes, and the predetermined humidity is 50%.

9. The method for curing the insulating varnish of a flat wire motor according to claim 8, characterized in that: In step 7, the curing temperature is 160° C.-180° C., and the curing time is 55-95 minutes.

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