Stator welding spot protection structure and motor thereof

Abstract

The invention discloses a stator welding spot protection structure and a motor thereof, the stator welding spot protection structure comprises a stator core, an insulation frame, a PCB, a protection cover and a stator winding wound on the insulation frame, a plurality of pin columns with jacks are arranged in the insulation frame at intervals, pins are correspondingly inserted in the jacks, the PCB is lapped on the upper surfaces of the pin columns, and the protection cover is arranged on the upper surface of the PCB. The stator winding is provided with a contact pin and is provided with a through hole through which the contact pin passes, the stator winding, the contact pin and the PCB are welded to form a conduction welding point, the protection cover covers the PCB, the protection cover is provided with an accommodating cavity with a bottom opening, and the accommodating cavity is filled with sealing insulation glue capable of covering the conduction welding point. A plurality of glue injection notches communicated with the containing cavity are distributed in the side face of the insulating frame at intervals. Most of the designed welding spot protection structures are manufactured through automatic equipment, the labor intensity of workers and the requirement for working skills are greatly reduced, and the purposes of low cost, high production efficiency and stable quality can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors for household appliances such as electric fans, range hoods, air purifiers, and bathroom heaters, and specifically relates to a stator welding point protection structure and a motor thereof. Background Art

[0002] With the sharp rise in copper prices, the cost pressure in the motor industry is increasing. In order to further develop motors that meet the energy-saving and consumption-reducing needs of the industry, motor manufacturers have to consider the motor materials. The iron core has a great impact on the performance, so it is not considered. In order to minimize the impact on the performance indicators of the motor and reduce the cost, the motor winding can only be replaced from copper enameled wire to aluminum enameled wire or copper-clad aluminum enameled wire. Because some chemical and physical properties of aluminum in aluminum enameled wire or copper-clad aluminum enameled wire determine that the welding of aluminum enameled wire or copper-clad aluminum enameled wire is very critical. If the welding is not done well, it will directly affect the product quality of the motor.

[0003] The aluminum wire or copper-clad aluminum wire motors used in existing electric fans, range hoods, air purifiers, bathroom heaters and other household appliances are generally distributed windings with conventional iron shell structures. The stator wiring method is that the enameled round wire is wound around the pins, and then connected by tinning (soldering), and then the solder joints are sealed and protected with heat shrink tubes. The entire production process is cumbersome and the production efficiency is low. The production process is all manually operated, which requires high labor intensity and work skills of the staff. At the same time, the scrap rate of the manual operation process is high, resulting in high production costs for the product. At the same time, it is difficult to ensure the quality of the solder joints at the connection of aluminum enameled wires or copper-clad aluminum enameled wires, which makes the connection points prone to oxidation, wire breakage and other defects, resulting in no power supply and short life. Summary of the invention

[0004] The purpose of the present invention is to provide a stator welding point protection structure and a motor thereof in order to solve the above-mentioned problem.

[0005] The technical solution adopted by the present invention is as follows:

[0006] According to a first aspect of the present invention, a stator solder joint protection structure comprises a stator core, an insulating frame, a PCB board, a protective cover and a stator winding wound on the insulating frame, wherein a plurality of pin posts with plug holes are arranged at intervals in the insulating frame, and pins are correspondingly plugged into the plug holes. The PCB board is overlapped on the upper surface of the pin posts and is provided with through holes for the pins to pass through. The stator winding, the pins and the PCB board are welded to form conductive solder joints. The protective cover is arranged outside the PCB board, and the protective cover has a accommodating cavity with a bottom opening, and the accommodating cavity is filled with a sealing insulating glue that can cover the conductive solder joints.

[0007] In a preferred embodiment, a plurality of glue injection notches communicating with the accommodating cavity are spaced apart on the side surface of the insulating frame, and the glue injection notches are located below the protective cover.

[0008] In a preferred embodiment, the side wall of the protective cover protrudes inward to form a plurality of limiting bosses, and the PCB board is provided with notches that meet the requirements of being engaged with the limiting bosses.

[0009] In a preferred embodiment, the inner walls on both sides of the protective cover are provided with a plurality of undercuts that are snapped into the back of the PCB board, and the back of the protective cover protrudes downward to form a support column that abuts against the front of the PCB board.

[0010] In a preferred embodiment, the insulating frame is nested on the stator core, and the insulating frame is made of a material with insulation, pressure resistance and heat resistance properties.

[0011] In a preferred embodiment, the protective cover is made of a material having transparent, insulating, pressure-resistant and heat-resistant properties.

[0012] In a preferred embodiment, the PCB board is provided with a plurality of positioning holes along its length direction, and the pin column is integrally provided with a positioning column capable of penetrating the positioning holes.

[0013] A second aspect of the present invention is a motor, comprising a stator welding point protection structure as described above.

[0014] In summary, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: most of the stator welding point protection structure is manufactured by automatic equipment, which greatly reduces the labor intensity and work skill requirements of the staff, and can achieve low cost, high production efficiency and stable quality. The stator welding point is completely wrapped in the protective cover by the sealing insulating glue, which not only completely isolates the welding point from the external air and prevents the welding point from oxidation, but also enhances the connection reliability of the welding point, improves the hidden dangers of broken wires and loose connection, and ensures product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of the present invention as a whole;

[0016] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the exploded three-dimensional structure of the present invention as a whole viewed from another angle;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the protective cover in the present invention.

[0019] Markings in the figure: 1- stator core, 2-insulating frame, 21-pin column, 211-positioning column, 22-glue injection notch, 3-pin, 4-stator winding, 5-PCB board, 51-notch, 6-protective cover, 61-limiting boss, 62-support column, 63-undercut, 7-sealing insulating glue, 8-conduction solder joint. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Reference Figure 1-4 A stator solder joint protection structure comprises a stator core 1, an insulating frame 2, a PCB board 5, a protective cover 6 and a stator winding 4 wound on the insulating frame 2, wherein a plurality of pin posts 21 with plug holes are arranged at intervals in the insulating frame 2, and pins 3 are correspondingly plugged into the plug holes, the PCB board 5 is overlapped on the upper surface of the pin posts 21, and is provided with through holes for the pins 3 to pass through, the stator winding 4, the pins 3 and the PCB board 5 are welded to form a conductive solder joint 8, the protective cover 6 is arranged outside the PCB board 5, the protective cover 6 has a receiving cavity with a bottom opening, and the receiving cavity is filled with a sealing insulating glue 7 that can cover the conductive solder joint 8, the stator winding 4 is wound on the insulating frame 2 with the pins 3 inserted, and its head is fixedly wound on the pins 3, and then the surface of the stator winding 4 wound on the pins 3 is removed by a device Paint leather, and place the PCB board 5 with welded power line leads on the pin column 21, and weld the three together through welding equipment to achieve electrical connection between the stator winding 4 and external components, install the protective cover 6 on the welded PCB board 5, turn the stator through the turning device, and inject sealing insulating glue 7 into the accommodating cavity through the glue injection machine, so that the sealing insulating glue 7 completely covers the position of the conductive solder joint 8 and makes it completely solidified in the protective cover 6. This not only completely isolates the connection point from the external air, but also strengthens the connection reliability of the connection point, improves the hidden dangers of broken wires and looseness at the connection, and ensures product quality. Secondly, most of the production is completed by automatic equipment, which greatly reduces the labor intensity and work skill requirements of the staff, and can achieve low cost, high production efficiency and stable quality.

[0022] The stator winding 4 is formed by winding aluminum enameled wire or copper-clad aluminum enameled wire.

[0023] It should be mentioned that the above-mentioned welding equipment, glue injection equipment, flipping equipment, etc. are all existing and well-known technologies and will not be described in detail here.

[0024] In one embodiment, a plurality of glue injection notches 22 connected to the accommodating cavity are spaced apart on the side of the insulating frame 2, and the glue injection notches 22 are located below the protective cover 6. A glue injection machine can inject the sealing insulating glue 7 into the accommodating cavity from the plurality of glue injection notches 22 on the insulating frame 2. Since there is a certain distance between the glue injection notches 22, the uniformity of the filling of the sealing insulating glue 7 can be ensured.

[0025] Reference Figure 4 As shown, the side wall of the protective cover 6 protrudes inward to form a plurality of limiting bosses 61, and the PCB board 5 is provided with a notch 51 that meets the requirements of the limiting boss 61. During assembly, the limiting boss 61 of the protective cover 6 is clamped on the notch 51 of the PCB board 5, which can prevent the protective cover 6 from rotating in a circle and play an auxiliary positioning role for the protective cover 6. There is at least one limiting boss 61, and the specific number is not limited here.

[0026] In one embodiment, the inner walls on both sides of the protective cover 6 are provided with a plurality of undercuts 63 which are snapped onto the back side of the PCB board 5. The back side of the protective cover 6 protrudes downward to form a support column 62 which abuts against the front side of the PCB board 5. The support column 62 is supported on the front side of the PCB board 5, and the undercuts 63 are snapped onto the back side of the PCB board 5 to ensure that the protective cover 6 can be stably fixed on the PCB board 5. Preferably, there are 4 undercuts 63 and 2 support columns 62, but these are not limited.

[0027] In one embodiment, the insulating frame 2 is nested on the stator core 1. The insulating frame 2 is made of a material with insulation, pressure resistance and heat resistance properties, and can insulate the stator winding 4 wound on the insulating frame 2. The insulating frame 2 is preferably made of nylon material, but can also be other materials with insulation, pressure resistance and heat resistance properties.

[0028] In one embodiment, the protective cover 6 is made of a material with transparent, insulating, pressure-resistant and heat-resistant properties. The protective cover 6 is preferably made of transparent nylon material, which facilitates monitoring of the filling and solidification of the sealing insulating glue 7 inside the protective cover 6 to ensure that the connection point is completely isolated from the external air.

[0029] In one embodiment, the PCB board 5 is provided with a plurality of positioning holes along its length direction, and the pin column 21 is integrally provided with a positioning column 211 that can penetrate the positioning hole. Through the cooperation between the positioning hole and the positioning column 211, the PCB board 5 can be stably fixed on the pin column 21.

[0030] An embodiment of the present invention further provides a motor, comprising a rotor (not shown) and a stator welding point protection structure as described above.

[0031] In summary, most of the above stator welding point protection structures are manufactured by automatic equipment, which greatly reduces the labor intensity and work skill requirements of the staff, and can achieve low cost, high production efficiency and stable quality. The stator welding point is completely covered in the protective cover 6 by the sealing insulating glue 7, which not only completely isolates the welding point from the external air and prevents the welding point from oxidation, but also enhances the connection reliability of the welding point to ensure product quality.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator welding point protection structure, characterized in that: It includes a stator core, an insulating frame, a PCB board, a protective cover and a stator winding wound on the insulating frame, wherein a plurality of pin posts with sockets are arranged at intervals in the insulating frame, and pins are correspondingly plugged into the sockets. The PCB board is overlapped on the upper surface of the pin posts and is provided with through holes for the pins to pass through. The stator winding, the pins and the PCB board are welded to form conductive solder joints. The protective cover is arranged outside the PCB board, and the protective cover has a accommodating cavity with a bottom opening, and the accommodating cavity is filled with sealing insulating glue that can cover the conductive solder joints.

2. A stator welding point protection structure according to claim 1, characterized in that: A plurality of glue injection notches communicated with the accommodating cavity are distributed at intervals on the side surface of the insulating frame, and the glue injection notches are located below the protective cover.

3. A stator welding point protection structure according to claim 1, characterized in that: The side wall of the protective cover protrudes inward to form a plurality of limiting bosses, and the PCB board is provided with notches that meet the requirements of being engaged with the limiting bosses.

4. A stator welding point protection structure as claimed in claim 1, characterized in that: The inner walls on both sides of the protective cover are provided with a plurality of undercuts which are clamped on the back of the PCB board, and the back of the protective cover protrudes downward to form a supporting column which abuts against the front of the PCB board.

5. A stator welding point protection structure according to claim 1, characterized in that: The insulating frame is nested on the stator core, and the insulating frame is made of a material with insulating, pressure-resistant and heat-resistant properties.

6. A stator welding point protection structure according to claim 1, characterized in that: The protective cover is made of a material with transparent, insulating, pressure-resistant and heat-resistant properties.

7. A stator welding point protection structure according to claim 1, characterized in that: The PCB board is provided with a plurality of positioning holes along its length direction, and the pin column is integrally provided with a positioning column capable of penetrating the positioning holes.

8. A motor, characterized in that: It comprises a stator welding point protection structure as claimed in any one of claims 1 to 7.

Images