Paint dripping method for motor stator

Abstract

The invention relates to a paint dripping method for a motor stator, which comprises the following steps of: S1, arranging the motor stator in a manner that the axis and the horizontal plane form a certain angle, keeping the motor stator to rotate around the axis, and enabling the crown end to be higher than the welding end; s2, insulating paint is dripped to the bottom of the inner circle of the crown end, and meanwhile insulating paint is dripped to the bottom of the inner circle of the welding end; s3, insulating paint is dropped to the part, located on one side of the crown end and extending out of the winding groove, of the insulation paper; s4, dropping insulating paint to the junction of the insulating paper and the crown end, and dropping insulating paint to the top of the outer circle of the crown end at the same time; s5, insulating paint is dripped to the bottom of the inner circle of the crown end, and meanwhile insulating paint is dripped to the top of the outer circle of the crown end; and S6, the motor stator is placed in the horizontal direction, the motor stator is kept to rotate around the axis, and meanwhile insulating paint is dripped to the top of the outer circle and the bottom of the inner circle of the crown end and the bottom of the outer circle and the bottom of the inner circle of the welding end. The paint hanging amount and the insulating paint filling rate of the motor stator after paint dripping can be improved, and the NVH of the motor is improved.

Description

Technical Field

[0001] The invention relates to the field of electric motors, and in particular to a paint dripping method for a motor stator. Background Art

[0002] After the winding of the motor stator is completed, the winding needs to be soaked in insulating paint. The purpose of this is to drive out the moisture contained in the stator and fill all the pores around the copper wires with insulating paint. This can not only improve the insulation strength, PDIV and moisture resistance of the stator, but also improve the heat resistance and heat dissipation of the winding. It can also improve the mechanical properties, chemical stability, thermal conductivity and heat dissipation effect of the winding insulation and delay aging. The quality of the motor stator varnish directly affects the temperature rise and service life of the motor. The methods of impregnating the winding with insulating paint mainly include dipping, dripping and dipping, each with its own advantages. Regardless of the method, the existing method of impregnating the winding with insulating paint has the problems of poor penetration effect, poor filling rate, easy dripping and waste of insulating paint, long processing time, and uneven insulating paint. Therefore, there is an urgent need for a motor stator dripping method that can solve the above problems. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an object of the present invention is to provide a method for dripping paint on a motor stator (100), wherein the motor stator (100) comprises a stator core (10), a winding (20) and an insulating paper (30), wherein the stator core (30) has a plurality of winding slots (11), the winding (20) comprises a plurality of wires (201) passing through the winding slots (11), the plurality of wires (201) forming a crown end (21) on one side of the stator core (10) and a welding end (22) on the other side of the stator core (20), the insulating paper (30) being arranged in the winding slots (11) and separating the wires (201) from the winding slots (11), and the method for dripping paint is characterized in that it comprises the following steps: S1: arranging the motor stator (100) with its axis at a certain angle to a horizontal plane and keeping the motor stator (100) rotating around its own axis, the crown end (21) higher than the welding end (22); S2: dripping insulating paint onto the inner circle bottom of the crown end (21), and also dripping insulating paint onto the inner circle bottom of the welding end (22); S3: dripping insulating paint onto the portion of the insulating paper (30) located on one side of the crown end (21) and extending from the winding groove (11); S4: dripping insulating paint onto the portion where the insulating paper (30) and the crown end (21) meet, and also dripping insulating paint onto the outer circle top of the crown end (21); S5: dripping insulating paint onto the inner circle bottom of the crown end (21), and also dripping insulating paint onto the outer circle top of the crown end (21); S6: placing the motor stator (100) in a manner in which the axis is parallel to the horizontal plane and keeping the motor stator (100) rotating around the axis, and simultaneously dripping insulating paint onto the outer circle top and inner circle bottom of the crown end (21), and the outer circle bottom and inner circle bottom of the welding end (22).

[0005] The paint dripping process for a motor stator provided by the present invention has the effect of increasing the paint amount and insulating paint filling rate of the motor stator, effectively controlling the number of paint nodules formed on the surface of the motor after the paint dripping is completed, and avoiding excessive gel time and surface cracks.

[0006] In some embodiments, the motor stator (100) is preheated before dripping insulating paint onto the motor stator (100), and the preheating temperature is 80°C-120°C. If the preheating temperature before dripping paint is too low, the viscosity of the insulating paint is high, and the insulating paint cannot fully penetrate into the surface of the motor stator. If the preheating temperature is too high, the insulating paint will gel prematurely and cannot fully penetrate into the stator. If the temperature is too high or the paint is gelled too high, paint nodules may be formed on the surface of the stator core.

[0007] In some embodiments, the flow rate of the insulating varnish on the motor stator (100) is controlled by changing the angle between the axis of the motor stator (100) and the horizontal plane in any one of steps S2 to S5, wherein the inclination angle between the axis of the motor stator (100) and the horizontal plane in steps S2 to S5 is between 5° and 20°. If the inclination angle of the motor stator is too small, the insulating varnish is not significantly affected by gravity when the inclination is set. If the inclination angle is too large, the insulating varnish flows too fast due to the influence of gravity and flows away from the iron core before entering the stator, resulting in paint on places on the iron core where the insulating varnish is not expected.

[0008] In some embodiments, in steps S2 to S6, the motor stator (100) maintains a uniform rotation speed between 10rpm-30rpm. If the rotation speed is too low, the centrifugal force is small, and the insulating paint gels before falling off in large quantities. If the rotation speed is too high, the centrifugal force is large, causing the insulating paint gel to be thrown out.

[0009] In some embodiments, the insulating paint is dripped at a uniform speed in steps S2 to S6, and the paint delivery speed is between 0.1g / s-0.3g / s. If the paint delivery speed is too fast, the paint will not have time to enter the gap of the stator and will flow away. If the paint delivery speed is too slow, the paint dripping time needs to be extended to meet the requirement of completely covering the area where the paint needs to be dripped.

[0010] In some embodiments, in steps S2 to S6, when a paint dripping gun is used to deliver paint and insulating paint is dripped onto the crown end (21) or the welding end (22), the distance between the nozzle of the paint dripping gun (22) and the nearest end face of the motor stator (100) in the axial direction of the motor stator (100) is between 5 mm and 25 mm.

[0011] In some embodiments, when dripping paint onto the inner circle bottom of the crown end (21) in step S2, the nozzle of the paint dripping gun is 5 mm-15 mm away from the end face of the stator core close to the crown end in the axial direction of the motor stator.

[0012] In some embodiments, when insulating paint is dripped onto the junction of the insulating paper (30) and the crown end (21) in step S4, the nozzle of the paint dripping gun is 10 mm-15 mm away from the end face of the stator core (10) on the side close to the crown end (21) in the axial direction of the motor stator (100); when insulating paint is dripped onto the outer circle of the crown end (21), the nozzle is 15 mm-25 mm away from the end face of the stator core (100) on the side close to the crown end (21) in the axial direction of the motor stator (100).

[0013] In some embodiments, when dripping insulating paint onto the inner and outer circles of the crown end (21) in step S5, the distance between the nozzle and the end surface of the motor stator close to the crown end (21) in the axial direction of the motor stator is between 10 mm and 15 mm and between 15 mm and 25 mm respectively.

[0014] In some embodiments, when insulating paint is dripped onto the inner and outer circles of the crown end (21) in step S6, the distances between the nozzle and the end surface of the motor stator (100) close to the crown end (21) in the axial direction of the motor stator (100) are between 15 mm and 20 mm and between 15 mm and 25 mm, respectively; and when insulating paint is dripped onto the inner and outer circles of the welding end (22), the distances between the nozzle and the end surface of the motor stator (100) close to the welding end (22) in the axial direction of the motor stator (100) are between 10 mm and 20 mm and between 15 mm and 25 mm, respectively.

[0015] First, drip paint on the inner circle of the winding end at the higher end (crown end) of the motor stator, close to the stator core, then drip insulating paint on the part of the winding close to the stator core and the insulating paper exposed from the winding slot, and then drip paint on the winding end and between the wire and the insulating paper. This can ensure that the insulating paint fully penetrates into the stator core. In the subsequent paint dripping steps, gradually move away from the stator core and approach the winding end, which is conducive to the winding end being covered with sufficient insulating paint. At the same time, dripping paint on the end of the winding away from the stator core increases the area of ​​the winding that receives the insulating paint, preventing the insulating paint from flowing away before it completely enters the stator.

[0016] In some embodiments, the motor stator (100) is heated by placing an induction heating coil on the inner circumference of the motor stator (100) or inputting current into the winding (20), so that the insulating paint is gelled.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Further features and advantages of the invention are apparent from the following description, which explains the invention in more detail based on an embodiment in conjunction with the drawings.

[0019] Figure 1 is a schematic diagram of the paint dripping position of the motor stator at an inclined angle of 7° according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of another paint dripping position of a motor stator at an inclined angle of 7° according to an embodiment of the present invention;

[0021] Figure 3is a schematic diagram of the paint dripping position of the motor stator at an inclined angle of 14° according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the paint dripping position of the motor stator at an inclined angle of 10° according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the paint dripping position of the motor stator when it is set horizontally according to an embodiment of the present invention

[0024] Figure 6 is a three-dimensional diagram of a motor stator provided according to an embodiment of the present invention;

[0025] Figure 7 This is an enlarged view of part A;

[0026] Figure 8 This is an enlarged view of part B;

[0027] Fig. 9 It is an enlarged view of part C;

[0028] Fig.10 This is an enlarged view of the D section;

[0029] Fig.11 It is a relationship diagram between the inclination angle of the motor stator and the filling rate of the insulating paint of the motor stator after dripping the paint;

[0030] Fig.12 It is a relationship diagram between the preheating temperature and the filling rate of the insulating paint of the motor stator after dripping the paint;

[0031] Fig.13 This is a graph showing the relationship between the rotation speed and the filling rate of the insulating paint on the motor stator after the paint is dripped;

[0032] Fig.14 It is a graph showing the relationship between the inclination angle of the motor stator and the amount of paint on the motor stator after dripping paint;

[0033] Fig.15 This is the relationship between the preheating temperature and the amount of paint on the motor stator after dripping paint;

[0034] Fig.16 It is a graph showing the relationship between the rotation speed and the amount of paint on the motor stator after paint dripping;

[0035] Description of reference numerals:

[0036] 100-Motor stator

[0037] 10-stator core, 11-winding slot;

[0038] 20-winding, 201-conductor, 21-crown end, 22-welding end;

[0039] 30-insulating paper;

[0040] A1-Drop paint gun, A2-Drop paint gun, A3-Drop paint gun, A4-Drop paint gun; DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used herein are only for the purpose of illustration and are not intended to limit the present invention.

[0042] Embodiment 1:

[0043] The purpose of the present invention is to provide a paint dripping method for a motor stator, wherein the motor stator 100 comprises a stator core 10, a winding 20 and an insulating paper 30, wherein the stator core 30 has a plurality of winding slots 11, and the winding 20 comprises a plurality of wires 201 passing through the winding slots 11, wherein the plurality of wires 201 form a crown end 21 on one side of the stator core 10 and a welding end 22 on the other side of the stator core 20, wherein the insulating paper 30 is arranged in the winding slot 11 and separates the wire 201 from the winding slot 11, and the paint dripping method is characterized in that it comprises the following steps: S1: the motor stator 100 is arranged with its axis at a certain angle to the horizontal plane and the motor stator 100 is kept rotating around its own axis, and the crown end 21 is higher than the welding end 22. The connecting end 22; S2: dripping insulating paint to the inner circle bottom of the crown end 21, and also dripping insulating paint to the inner circle of the welding end 22; S3: dripping insulating paint to the portion of the insulating paper 30 located on one side of the crown end 21 and extending from the winding groove 11; S4: dripping insulating paint to the portion of the insulating paper 30 that intersects with the crown end 21, and also dripping insulating paint to the outer circle of the crown end 21; S5: dripping insulating paint to the inner circle bottom of the crown end 21, and also dripping insulating paint to the outer circle top of the crown end 21; S6: placing the motor stator 100 horizontally and keeping the motor stator 100 rotating around its own axis, and at the same time dripping insulating paint to the outer circle top and inner circle bottom of the crown end 21, and the outer circle bottom and inner circle bottom of the welding end 22.

[0044] The winding 20 is formed by a wire 201 passing through the winding slot 11. The wire 201 is first formed by a paint film removal process before being inserted into the winding slot 11, and is formed into a U shape by splitting, punching and bending. The two legs of the U-shaped wire are inserted from different winding slots 11, and the legs of multiple wires form a welding end on one side of the stator core, and the bottom of the U-shaped wire forms a crown end on the other side. In the embodiment of the present invention, insulating paint is first dripped on one side of the crown end and then on the welding end. The stator core is a hollow cylinder, and the winding slots 11 are arranged in the circumferential direction of the stator. The shape of the winding 20 can be understood as a hollow cylinder with an inner circle and an outer circle. When dripping paint on the outer circle of the end of the winding, the nozzle of the paint dripping gun is located above the winding, and the top of the outer circle of the stator winding is selected to drip paint. When dripping paint on the inner circle of the end of the winding, the nozzle of the paint dripping gun is located at the bottom of the inner circle of the winding to drip paint.

[0045] When dripping insulating paint onto the motor stator 100, the axis of the motor stator 100 is generally tilted to a certain angle with the horizontal plane, which is called the working tilt angle. This method of dripping paint is called the tilt method, which can speed up the flow and penetration speed of the insulating paint. When the working tilt angle is small, the flow and penetration speed of the insulating paint is slow, which can prevent the dripping time from being too short and causing poor filling. For windings with thin wire diameters, long iron cores, and high slot filling rates, the workpiece tilt angle should be larger but not too large, otherwise the winding end will contain too little paint, resulting in poor surface coverage.

[0046] When dripping paint, first drip it at a certain angle to allow the paint to penetrate quickly. When the lower part begins to flow full, quickly lay the workpiece flat and then drip a certain amount of paint. This will make the paint evenly distributed and shorten the paint dripping time.

[0047] Dripping paint onto the inner and outer circles of the crown end 21 and the welding end 22 of the winding 20 can fill the insulating paint between the wires 201, and dripping paint on the part of the insulating paper 30 exposed from the winding groove 11 can fill the gap between the insulating paper 30 and the winding groove 11. At the same time, the insulating paint can form an insulating paint layer between the stator core 10 punchings, and dripping paint at the junction of the insulating paper 30 and the wire 201 can fill the gap between the wire 201 and the insulating paper 30. The insulating paint strengthens the connection force between the stator core 10 punchings, improves the stator stiffness, and thus improves the motor NVH.

[0048] The motor stator 100 is tilted in a manner that the crown end 21 is higher than the welding end 22. Considering that it takes a certain amount of time for the insulating paint to penetrate from the outside of the stator to the inside, the insulating paint is dripped onto the crown end 21 first. Figures 1 to 6As shown, the crown end includes the bend at the bottom of the U-shaped wire, which has a stronger ability to store insulating paint than the structure of the welding end. Under the same dripping conditions, if the insulating paint is dripped on the welding end, it is easy for the insulating paint to drip and flow from the motor stator before entering the stator. After tilting the paint dripping, the insulating paint on the motor stator will flow down due to gravity. Therefore, it is necessary to set the motor stator horizontally and add a certain amount of insulating paint at both ends of the winding to ensure that there is enough insulating paint at both ends of the winding and the insulating paint fully penetrates into the stator.

[0049] In some embodiments, the motor stator 100 is preheated before dripping the insulating paint, and the preheating temperature is 80° C.-120° C. If the preheating temperature in the paint dripping method is too low, the viscosity of the insulating paint is large, and the insulating paint cannot fully penetrate into the surface of the motor stator. If the preheating temperature is too high, the insulating paint will gel in advance and cannot fully penetrate into the stator. If the temperature is too high or too high after gelling, paint nodules may form on the surface of the stator core.

[0050] In some embodiments, the flow rate of the insulating varnish on the stator is controlled by changing the inclination angle between the axis of the motor stator and the horizontal plane in any step from step S2 to step S5, wherein the inclination angle between the axis of the motor stator and the horizontal plane in steps S2 to step S5 is between 5° and 20°. Generally, the inclination angle of the motor stator in steps S2 and S3 is smaller than the inclination angle of the motor stator in steps S4 and S5 to ensure that the insulating varnish flows from the crown end to the welding end through the motor stator during the dripping process from the crown end. In addition, if the inclination angle of the motor stator is too small, the insulating varnish is not significantly affected by gravity when the inclination is set, and if the inclination angle is too large, the insulating varnish flows too fast due to the influence of gravity, and flows away from the iron core before entering the stator, resulting in paint on the iron core where the insulating varnish is not expected.

[0051] In some embodiments, in steps S2 to S6, the motor stator 100 keeps rotating at a constant speed, and the speed is between 10rpm and 30rpm. If the speed is too low, the centrifugal force is small, and the insulating paint drips a lot before gelling. If the speed is too high, the centrifugal force is large, causing the insulating paint to be thrown out before gelling.

[0052] In some embodiments, the paint is uniformly delivered in step S2 to step S6, and the paint delivery speed is between 0.1g / s-0.3g / s. The paint delivery speed of the paint dripping gun is obtained based on experience and calculation. If the paint delivery speed is too fast, the paint will flow away before it can enter the gap of the stator. If the paint delivery speed is too slow, the paint dripping time needs to be extended to meet the requirement of completely covering the paint dripping area. The paint dripping time of the motor at each tilt angle is determined by the paint delivery speed and the required paint dripping amount. The paint dripping time is inversely proportional to the paint delivery speed and proportional to the paint dripping amount. The total paint delivery amount is calculated in advance and allocated to each step. The paint delivery time of each step is calculated according to the paint delivery amount and the paint delivery speed, and whether each step is completed is confirmed according to the paint dripping time. At present, a metering pump is generally used to control the paint dripping amount, so that each workpiece can get the same amount of paint to ensure the quality of the workpiece dripping. After the paint dripping amount is determined, the paint dripping speed is determined by experiment. Even if the dripped paint can be absorbed without losing speed, the paint dripping time can be obtained after the paint dripping amount and the paint dripping speed are determined.

[0053] In some embodiments, in steps S2 to S6, a paint dripping gun is used to deliver paint. When dripping insulating paint onto the crown end 21 or the welding end 22, the nozzle of the paint dripping gun 22 is 5mm-25mm away from the end face of the motor stator 100 closest to the motor stator 100 in the axial direction of the motor stator 100. When dripping paint onto the inner circle bottom of the crown end 21 in step S2, the nozzle of the paint dripping gun is 5mm-15mm away from the end face of the stator core close to the crown end in the axial direction of the motor stator. When dripping insulating paint onto the junction of the insulating paper 30 and the crown end 21 in step S4, the nozzle of the paint dripping gun is 10mm-15mm away from the end face of the stator core 10 close to the crown end 21 in the axial direction of the motor stator 100. When dripping insulating paint onto the outer circle of the crown end 21, the nozzle is 15mm-25mm away from the end face of the stator core 100 close to the crown end 21 in the axial direction of the motor stator 100. When dripping insulating paint onto the inner and outer circles of the crown end 21 in step S5, the distances of the nozzle from the end face of the motor stator close to the crown end 21 in the axial direction of the motor stator are 10mm-15mm and 15mm-25mm respectively. When dripping insulating paint onto the inner and outer circles of the crown end 21 in step S6, the distances of the nozzle from the end face of the motor stator 100 close to the crown end 21 in the axial direction of the motor stator 100 are 15mm-20mm and 15mm-25mm respectively, and when dripping insulating paint onto the inner and outer circles of the welding end 22, the distances of the nozzle from the end face of the motor stator 100 close to the welding end 22 in the axial direction of the motor stator 100 are 10mm-20mm and 15mm-25mm respectively. The position of the nozzle of the paint gun from the stator end face in the axial direction of the stator needs to be determined according to the size of the stator. In this embodiment, the stator core is cylindrical as a whole, with an outer diameter between 160mm-400mm and a length between 50mm-200mm. The parameters not described in detail are generally determined according to the needs of on-site production, and the parameter values ​​that meet the actual production needs can be obtained through repeated tests and verification.

[0054] In some embodiments, the insulating paint is gelled by placing an induction heating coil on the inner circumference of the motor stator 100 or inputting current into the winding 20 to heat the motor stator 100. If the gelling temperature is too low, gelling will not occur or the gelling time will be too long, which is not conducive to mass production. If the temperature is too high, gelling will be too fast, cracks will appear in the local insulating paint, and the gelling time and production efficiency will be affected.

[0055] The present invention provides a paint dripping method for a motor stator, which first drips paint on the inner circle of the winding end of the higher end of the motor stator (the higher end in this embodiment is the crown end) near the stator core, first drips insulating paint on the crown end (the left end of the winding near the stator core) and the part of the insulating paper exposed from the winding groove, and then drips paint on the junction of the crown end (the left end of the winding) and the insulating paper. Even if the gap between the insulating paper and the winding groove is small, the insulating paint can fully penetrate into the stator core. In the subsequent paint dripping steps, the paint gradually moves away from the stator core and approaches the winding end, which is conducive to the winding end being covered with sufficient insulating paint. At the same time, paint is dripped on the end of the winding away from the stator core, which increases the area of ​​the winding that receives the insulating paint, preventing the insulating paint from flowing away before it completely enters the stator.

[0056] like Figures 1 to 5 As shown in the figure, the paint dripping process of the motor stator is as follows:

[0057] The motor stator is tilted to 7°, the rotation speed is 15rpm, the nozzle of the paint gun A1 drips paint on the inner circle of the crown end at a distance of 15mm from the stator end face on the axis, and the paint delivery speed is 0.2g / s. At the same time, the paint gun B1 drips insulating paint to the bottom of the inner circle of the welding end, and the paint delivery speed is 0.2g / s;

[0058] The tilt angle is 7°, the rotation speed is 15rpm, and the paint gun A1 drips insulating paint onto the insulating paper with the winding groove exposed on one side of the stator crown end, and the paint delivery speed is 0.3g / s;

[0059] The inclination angle is 14°, the rotation speed is 20rpm, and the paint dripping gun A1 drips insulating paint at the junction of the crown end and the insulating paper. The paint delivery speed is 0.25g / s. The nozzle of the paint dripping gun A1 is 10mm away from the stator end face on the crown end side in the axial direction of the stator; the paint dripping gun A2 drips paint on the outer circle top of the stator left end winding. The paint delivery speed is 0.25g / s. The nozzle of the paint dripping gun A2 is 15mm away from the stator end face on the crown end side in the axial direction of the stator;

[0060] The tilt angle is 10°, the rotation speed is 20rpm, the paint dripping gun A1 drips paint at the bottom of the inner circle of the crown end, the paint delivery speed is 0.15g / s, and the nozzle of the paint dripping gun A1 is 10mm away from the stator end face on the crown end side in the axial direction of the stator. The paint dripping gun A2 drips paint at the top of the outer circle of the crown end at a paint delivery speed of 0.15g / s, and the nozzle of the paint dripping gun A2 is 15mm away from the stator end face on the crown end side in the axial direction of the stator;

[0061] The motor stator is placed horizontally with a rotation speed of 25 rpm. Paint dripping gun A1 drips paint at the bottom of the inner circle of the crown end at a paint delivery speed of 0.15 g / s. The nozzle of paint dripping gun A1 is 20 mm away from the stator end face on the crown end side in the axial direction of the stator; paint dripping gun A2 drips paint at the top of the outer circle of the crown end at a paint delivery speed of 0.1 g / s. The nozzle of paint dripping gun A2 is 25 mm away from the stator end face on the crown end side in the axial direction of the stator; paint dripping gun B1 drips paint at the bottom of the inner circle of the welding end at a paint delivery speed of 0.15 g / s. The nozzle of paint dripping gun B1 is 20 mm away from the stator end face on the welding end side in the axial direction of the stator; paint dripping gun B2 drips paint at the top of the outer circle of the welding end at a paint delivery speed of 0.1 g / s. The nozzle of paint dripping gun B2 is 25 mm away from the stator end face on the welding end side in the axial direction of the stator.

[0062] Place the induction heating coil on the inner ring of the stator, induction heat the motor stator to 150°C, keep it for 5 minutes, so that the insulating paint gels; transfer the stator to a 160°C environment and keep it for 0.5 hours for curing.

[0063] It should be noted that Figures 1 to 5 It is only used to show the stator tilt angle, rotation speed, paint delivery speed and paint dripping position of the paint dripping process. It is not the structure of the winding end when the paint is actually dripped. In the actual production process, the welding points at the welding end of the winding are welded before dripping paint.

[0064] like Figures 7 to 10 Shown are enlarged views of parts A, B, C and D, where the enlarged view of part A shows that the nozzle of the A1 paint dripping gun is located at the inner circle of the stator crown end close to the stator end face and dripping insulating paint, the enlarged view of part B shows that the nozzle of the B1 paint dripping gun is located at the bottom of the stator welding end and dripping insulating paint, the enlarged view of part C shows that the nozzle of the A1 paint dripping gun is located at the part of the insulating paper on one side of the motor stator crown end that is exposed from the winding slot and dripping insulating paint, and the enlarged view of part D shows that the nozzle of the A1 paint dripping gun is located at the junction of the crown end and the insulating paper and dripping insulating paint.

[0065] The equipment used in the stator dripping paint in this embodiment are all existing technologies. For example, when dripping paint, a structure similar to a chuck clamp can be used to fix the motor stator and realize the tilting setting of the motor stator. The paint dripping gun, oven, etc. are all existing technologies and will not be repeated here.

[0066] The filling rate of insulating paint refers to the ratio of the volume of the gap between the conductor and the stator core in the motor stator filled with insulating paint to the volume of the total gap between the conductor and the stator core. The amount of paint applied is the weight of the motor stator after paint dripping minus the weight of the motor stator before paint dripping.

[0067] like Fig.11As shown in the figure, when the inclination angle of the motor stator is greater than 5°, the filling rate of the insulating varnish increases significantly, and the filling rate is about 88% at 5°. It reaches a peak at 10°, and the filling rate is about 89%. It shows a downward trend after being higher than 15°, and the filling rate is about 88% at 15°.

[0068] like Fig.12 As shown in the figure, when the preheating temperature is lower than 120℃, the filling rate of the motor stator insulating paint increases with the increase of temperature, reaching the maximum value at the preheating temperature of 120℃, with the filling rate of 92%. When the preheating temperature is higher than 120℃, the amount of paint hanging decreases significantly. When the preheating temperature is 80°, the filling rate is about 89%, and when the preheating temperature is 100°, the filling rate is about 91%.

[0069] like Fig.13 The figure shows the relationship between the rotation speed and the filling rate. When the rotation speed is 10rpm, the filling rate is about 89%. When the rotation speed is 20rpm, the filling rate reaches a peak of 90%. When the rotation speed is 30rpm, the filling rate is about 88%. Fig.16 In the relationship diagram between the rotation speed and the amount of paint, when the rotation speed is greater than 30rpm, the filling rate and the amount of paint are obviously reduced, so the preferred range of the rotation speed in this embodiment is 10rpm-30rpm.

[0070] like Fig.14 The figure shows the relationship between the preheating temperature and the amount of paint. When the preheating temperature is 80°, the amount of paint is 106g. When the preheating temperature is 100°, the amount of paint is 112g. Then, it reaches a peak of about 113g at 120°. Fig.14 The relationship between the preheating temperature and the filling rate is shown in FIG. 1 . When the preheating temperature is greater than 120°, the amount of paint applied and the filling rate decrease significantly. Therefore, the preferred range of the preheating temperature in this embodiment is 80°-120°.

[0071] like Fig.15 The figure shows the relationship between the amount of paint hanging and the tilt angle. When the tilt angle is 5°, the amount of paint hanging is 107g. When the motor tilt angle is 10°, the amount of paint hanging is the largest, at this time the amount of paint hanging is 110g. When the tilt angle is 20°, the amount of paint hanging is 108g. Fig.11 Regarding the relationship between the inclination angle and the filling rate, when the inclination angle exceeds 15°, although the amount of paint hanging does not decrease significantly, the filling rate decreases significantly, so the preferred range of the motor stator in this embodiment is 5°-15°.

[0072] like Fig.16 It is shown that when the rotation speed is 5rpm, the amount of paint hanging is 107g. As the rotation speed increases, the amount of paint hanging also increases. The amount of paint hanging reaches the maximum at the rotation speed of 20rpm, which is 112g. When the rotation speed is 30rpm, the amount of paint hanging is 106g.

[0073] Therefore, a motor stator paint dripping method provided in an embodiment of the present invention can increase the amount of paint applied to the motor stator after paint dripping and the insulating paint filling rate, thereby improving the NVH of the motor.

[0074] Embodiment 2:

[0075] The purpose of this embodiment is to provide a paint dripping method for a motor stator. The process steps are substantially the same as those in Embodiment 1. The difference is that in this embodiment, the parameters of the motor stator inclination angle, rotation speed, paint delivery speed, preheating temperature, and the distance between the paint dripping gun nozzle and the motor stator end face in the axial direction are selected differently, as follows:

[0076] Set the motor stator to an angle of 5° and a rotation speed of 10 rpm. Use a paint gun A1 to drip paint on the inner circle of the crown end at a distance of 15 mm from the stator end face on the axis. The paint delivery speed is 0.2 g / s. At the same time, use a paint gun B1 to drip insulating paint on the bottom of the inner circle of the welding end. The paint delivery speed is 0.2 g / s.

[0077] The paint gun A1 drips insulating paint onto the insulating paper with exposed winding grooves on the crown end of the stator at an inclination angle of 5° and a rotation speed of 10 rpm. The paint delivery speed is 0.3 g / s.

[0078] The inclination angle is 10°, the rotation speed is 15rpm, and the paint dripping gun A1 drips insulating paint at the junction of the crown end and the insulating paper. The paint delivery speed is 0.2g / s, and the nozzle of the paint dripping gun A1 is 15mm away from the stator end face on the crown end side in the axial direction of the stator; the paint dripping gun A2 drips paint on the outer circle top of the crown end. The paint delivery speed is 0.2g / s, and the nozzle of the paint dripping gun A2 is 15mm away from the stator end face on the crown end side in the axial direction of the stator;

[0079] The tilt angle is 10°, the rotation speed is 15rpm, the paint dripping gun A1 drips paint at the bottom of the inner circle of the crown end, the paint delivery speed is 0.15g / s, and the nozzle of the paint dripping gun A1 is 15mm away from the stator end face on the crown end side in the axial direction of the stator. The paint dripping gun A2 drips paint at the top of the outer circle of the crown end at a paint delivery speed of 0.1g / s, and the paint dripping gun A2 is 20mm away from the stator end face on the crown end side in the axial direction of the stator;

[0080] The motor stator is placed horizontally with a rotation speed of 20rpm. Paint dripping gun A1 drips paint on the inner circle bottom of the crown end at a paint delivery speed of 0.1g / s. The nozzle of paint dripping gun A1 is 20mm away from the stator end face on the crown end side in the axial direction of the stator; paint dripping gun A2 drips paint on the outer circle top of the crown end at a paint delivery speed of 0.1g / s. The nozzle of paint dripping gun A2 is 25mm away from the stator end face on the crown end side in the axial direction of the stator; paint dripping gun B1 drips paint on the inner circle bottom of the welding end at a paint delivery speed of 0.1g / s. The nozzle of paint dripping gun B1 is 20mm away from the stator end face on the welding end side in the axial direction of the stator; paint dripping gun B2 drips paint on the outer circle top of the welding end at a paint delivery speed of 0.1g / s. The nozzle of paint dripping gun B2 is 25mm away from the stator end face on the welding end side in the axial direction of the stator.

[0081] The values ​​of the preheating temperature, rotation speed, inclination angle and paint delivery speed in the embodiment of the present invention are also within the preferred range in Example 1. Therefore, a motor stator paint dripping method provided in this embodiment can also increase the amount of paint applied and the insulating paint filling rate of the motor stator after paint dripping, and improve the NVH of the motor.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A paint dripping method for a motor stator, the motor stator (100) comprising a stator core (10), a winding (20) and an insulating paper (30), the stator core (30) having a plurality of winding slots (11), the winding (20) comprising a plurality of wires (201) passing through the winding slots (11), the plurality of wires (201) forming a crown end (21) on one side of the stator core (10) and a welding end (22) on the other side of the stator core (20), the insulating paper (30) being arranged in the winding slots (11) and separating the wires (201) from the winding slots (11), the paint dripping method being characterized by comprising the following steps: S1: The motor stator (100) is arranged so that its axis forms a certain angle with the horizontal plane and the motor stator (100) is kept rotating around its own axis, and the crown end (21) is higher than the welding end (22); S2: dripping insulating paint onto the inner circle bottom of the crown end (21), and also dripping insulating paint onto the inner circle bottom of the welding end (22); S3: dripping insulating varnish onto a portion of the insulating paper (30) located on one side of the crown end (21) and extending out of the winding groove (11); S4: dripping insulating paint onto the junction of the insulating paper (30) and the crown end (21), and also dripping insulating paint onto the outer dome of the crown end (21); S5: dripping insulating paint onto the inner circle bottom of the crown end (21), and also dripping insulating paint onto the outer circle top of the crown end (21); S6: The motor stator (100) is placed in a manner such that the axis is parallel to the horizontal plane and the motor stator (100) is kept rotating around the axis, and at the same time, insulating paint is dripped onto the outer circular top and inner circular bottom of the crown end (21) and the outer circular bottom and inner circular bottom of the welding end (22).

2. A paint dripping method for a motor stator according to claim 1, characterized in that: Before dripping insulating paint onto the motor stator (100), the motor stator (100) is preheated, with the preheating temperature being 80° C.-120° C.

3. The paint dripping method for a motor stator according to claim 2, characterized in that: The flow rate of the insulating varnish on the motor stator (100) is controlled by changing the angle between the axis of the motor stator (100) and the horizontal plane in any one of steps S2 to S5, wherein the inclination angle between the axis of the motor stator (100) and the horizontal plane in steps S2 to S5 is between 5° and 20°.

4. The paint dripping method for a motor stator according to claim 2, characterized in that: In steps S2 to S6, the motor stator (100) keeps rotating at a constant speed, with the rotation speed being between 10 rpm and 30 rpm.

5. The paint dripping method for a motor stator according to claim 2, characterized in that: When dripping insulating paint in step S2 to step S6, the paint is delivered at a uniform speed, and the paint delivery speed is between 0.1g / s-0.3g / s.

6. The paint dripping method for a motor stator according to claim 2, characterized in that: In step S2 to step S6, when insulating paint is dripped onto the crown end (21) or the welding end (22) using a paint dripping gun, the distance between the nozzle of the paint dripping gun (22) and the nearest end face of the motor stator (100) in the axial direction of the motor stator (100) is between 5 mm and 25 mm.

7. A paint dripping method for a motor stator according to claim 6, characterized in that: When dripping paint onto the inner circle bottom of the crown end (21) in step S2, the nozzle of the paint dripping gun is 5 mm to 15 mm away from the end face of the stator core close to the crown end in the axial direction of the motor stator.

8. The paint dripping method for a motor stator according to claim 7, characterized in that: When dripping insulating paint onto the junction of the insulating paper (30) and the crown end (21) in step S4, the nozzle of the paint dripping gun is at a distance of 10 mm to 15 mm from the end face of the stator core (10) on the side close to the crown end (21) in the axial direction of the motor stator (100); and when dripping insulating paint onto the outer circle of the crown end (21), the nozzle is at a distance of 15 mm to 25 mm from the end face of the stator core (100) on the side close to the crown end (21) in the axial direction of the motor stator (100).

9. A paint dripping method for a motor stator according to claim 8, characterized in that: When dripping insulating paint onto the inner and outer circles of the crown end (21) in step S5, the distances of the nozzle from the end surface of the motor stator close to the crown end (21) in the axial direction of the motor stator are 10 mm-15 mm and 15 mm-25 mm respectively.

10. A paint dripping method for a motor stator according to claim 9, characterized in that: When the insulating paint is dripped onto the inner and outer circles of the crown end (21) in step S6, the distances between the nozzle and the end surface of the motor stator (100) close to the crown end (21) in the axial direction of the motor stator (100) are 15 mm-20 mm and 15 mm-25 mm respectively, and when the insulating paint is dripped onto the inner and outer circles of the welding end (22), the distances between the nozzle and the end surface of the motor stator (100) close to the welding end (22) in the axial direction of the motor stator (100) are 10 mm-20 mm and 15 mm-25 mm respectively.

Images