A motor stator vacuum rotary potting system and method

Abstract

The present invention discloses a motor stator vacuum rotary potting system, comprising a vacuum tank, a supporting platform, a rotating core, a rotary sealing joint, a rocker arm, a discharge joint, a connecting hose, a lighting device and a monitoring device. The invention also discloses a potting method, wherein after the vacuum tank is evacuated, a rotary potting device is adopted to transport the potting glue to the end of the motor stator. The present invention has a simple principle and low cost, and makes up for the shortcomings of uneven distribution of static potting at the end and poor fluidity of high thermal conductivity potting glue, and is suitable for end potting of various types of motors.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a motor stator vacuum rotary potting system and a potting method thereof. Background Art

[0002] In current motor design, the loss of motor end windings is relatively high. The commonly used end cooling method is forced air cooling. Although it can directly cool the heat-generating components of the motor, the cooling efficiency of air cooling is limited. For high-power density and ultra-high-power density motors, especially the motor winding ends, it cannot achieve the required cooling effect.

[0003] To address the heat dissipation issue of motor end windings, many small motors currently use end potting to reduce the conduction thermal resistance between the end windings and the water-cooled base. Due to process and cost issues, end potting is rarely used in medium and large motors. With the introduction of better solutions for end cooling, end potting is increasingly being used in high-power density and ultra-high-power density motors.

[0004] For example, in invention patent ZL202010873064.8, a complete set of stator water cooling solutions is proposed for high-power, high-power density motors. High-thermal-conductivity silicone grease is poured into the end cavity formed between the end inner cover, the end outer cover and the integrated bracket. This can effectively reduce the temperature of the end winding, protect the end winding, and improve the reliability of the motor stator. However, traditional potting methods have problems such as poor fluidity of the high-thermal-conductivity silicone grease potting glue and long process time. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned technology, one of the purposes of the present invention is to provide a motor stator vacuum rotary potting system to solve the problems of uneven static potting, poor fluidity of high thermal conductivity potting glue, and long process time, effectively improve the heat dissipation and protection performance of the motor end, increase the reliability of large and medium-sized motor stators, and extend the life of the motor.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a motor stator vacuum rotary potting system, including a vacuum tank and a support platform arranged in the vacuum tank and composed of multiple metal tubes and flat plates welded together. The vacuum tank is a tank body with a vacuum pumping device, which is used to evacuate the air before potting. A rotating core driven by a motor is fixed on the support platform, and a rotary sealing joint and a rocker arm are provided on the rotating core. A connecting hose connected to the rotary sealing joint and a metal discharge joint led out from the non-metallic connecting hose are fixed on the rocker arm. The end of the rocker arm is provided with a lighting device and a monitoring device for illuminating and monitoring the discharge port of the discharge joint.

[0007] The vacuum tank of the motor stator vacuum rotary potting system can adopt the VPI paint dipping tank in the motor industry, and can also be customized according to the size of the potting motor stator.

[0008] The motor stator vacuum rotary potting system has a rotating core composed of a drive motor, a gear transmission structure and a fixed structure, and the drive motor realizes the start and stop, rotation, reversal, speed change and other functions of the rocker arm.

[0009] The motor stator vacuum rotary potting system has a rotary sealing joint comprising a moving end connected to a discharge joint and a static end connected to a potting machine or an outlet of a potting glue container.

[0010] In the motor stator vacuum rotary potting system, the rocker arm is fixed to the rotating core through a pressure plate, and a metal flat plate is arranged at the end of the rocker arm, and the lighting device and the monitoring device are fixed through the flat plate.

[0011] A second object of the present invention is to provide a motor stator vacuum rotary potting method, the steps of which are as follows:

[0012] a. Before potting, fix the rotating core to the support platform, fix the rotary sealing joint and rocker arm to the rotating core, then connect the moving end of the rotary sealing joint to the discharge joint with a connecting hose, and connect the static end of the rotary sealing joint to the potting machine or the potting glue container outlet with a connecting hose. The connecting hose should be securely fixed along the way to ensure that it does not interfere with the rotating rocker arm. Finally, securely fix the lighting device and monitoring device on both sides of the flat plate at the end of the rocker arm;

[0013] b. After the potting system is installed, check and confirm that all equipment is in good condition, close the sealing cover of the vacuum tank, turn on the vacuum device of the vacuum tank, stop vacuuming after reaching the specified vacuum degree P1, and maintain the vacuum degree P1 for time t1;

[0014] c. Turn on the motor to drive the rotating core and use the lighting device and monitoring device to observe whether the rotation state is normal, the change of the liquid level and whether there is any glue leakage;

[0015] d. Discharge the material at the preset discharging speed and perform rotary potting of the motor stator; if there is no abnormality, maintain vacuum potting until the specified position; if there is an abnormality, the control button of the rotating core can be used to pause the rotation of the rotating core and find the cause;

[0016] e. After potting is completed, maintain the specified vacuum time t2 to ensure that all internal air escapes;

[0017] f. Gradually pressurize the vacuum tank until the internal pressure is P2 and maintain the pressure for time t3 to ensure that the surface liquid level is flush;

[0018] g. After gradually releasing the pressure in the vacuum tank to normal pressure, open the sealing cover, dismantle the potting system piece by piece in the reverse order of installation, and steadily lift the potting motor out of the vacuum tank;

[0019] h. According to the curing temperature requirements, move the potted motor to the oven platform for heating and curing or leave it to cure at room temperature.

[0020] Compared with the prior art, the above technical solution conceived by the present invention has the following technical effects:

[0021] 1. The present invention adopts vacuum rotary potting technology, which can effectively avoid the internal porosity of the potting compound caused by the presence of air during the potting process, thereby reducing the end thermal resistance and improving the heat dissipation efficiency of the end water cooling system;

[0022] 2. The present invention overcomes the problems of uneven static potting and poor fluidity of high thermal conductivity potting glue. It has a simple principle, good adaptability to motor size, good processability and low cost.

[0023] 3. The present invention realizes visual operation and full process monitoring of potting in a vacuum environment by adding lighting devices and monitoring devices to the potting system, effectively overcoming the blind operation defect of potting in a vacuum environment in the past. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 Schematic diagram of the rotary potting system of the present invention;

[0026] Figure 3 This is a schematic structural diagram of the rotating core of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the rotary sealing joint of the present invention.

[0028] The figures are marked as follows: 1—vacuum tank, 2—support platform, 3—rotating core, 3.1—driving motor, 3.2—gear transmission structure, 3.3—fixed structure, 4—rotating sealing joint, 4.1—moving end, 4.2—static end, 5—rocker arm, 6—discharge joint, 7—connecting hose, 8—lighting device, 9—monitoring device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1 、 Figure 2As shown, the present invention discloses a motor stator vacuum rotary potting system, comprising a vacuum tank 1 and a support platform 2 arranged in the vacuum tank 1 and composed of multiple metal pipes and flat plates welded together. The vacuum tank 1 is a tank body with a vacuum pumping device, which is used to evacuate the air before potting. The vacuum tank 1 can adopt the VPI varnishing tank in the motor industry, and can also be customized according to the size of the potting motor stator. The support platform 2 is used to fix the entire device including the rotating core 3, the rocker arm 5, the discharge joint 6, etc., and can also support the potting motor stator as needed. The design of the support platform 2 is based on the inner and outer diameters and axial length of the motor stator to be potted. The height of the supporting platform 2 is determined by the degree of the potting motor stator, and its height is adapted to the height of the potting motor stator: when the inner diameter of the potting motor stator is ≥1000mm, the supporting platform 2 is placed in the center of the potting motor stator, and its height is flush with the end of the potting motor stator; when the inner diameter of the potting motor stator is 500mm≤and <1000mm, the potting motor stator is placed on the supporting platform 2, and the height of the rotating core 3 is adapted to the axial length of the potting motor stator. A rotating core 3 driven by a motor is fixed on the supporting platform 2, and a rotating sealing joint 4 and a rocker arm 5 are provided on the rotating core 3. The rotating core 3 is driven by the motor to drive the rocker arm 5 to rotate, and the rotating sealing joint 4 is A rotary joint with a dynamic seal is used to connect dynamic and static pipes. A connecting hose 7 connected to the rotary seal joint 4 and a metal discharge joint 6 led out of the non-metallic connecting hose 7 are fixed on the rocker arm 5. The rocker arm 5 is used to fix the discharge joint 6 and the connecting hose 7 to achieve synchronous rotation with the rotating core 3. The discharge joint 6 is used to achieve uniform discharge in the potting area. According to the size of the potting area, it can be designed in various forms, such as tubular, flat, etc., to achieve uniform potting. The connecting hose 7 is used between the dynamic end 4.1 of the rotary seal joint 4 and the discharge joint 6, and the static end 4.2 of the rotary seal joint 4 and the potting machine or The connection between the outlets of the potting glue container, wherein the rocker arm 5 is fixed to the rotating core 3 by a pressure plate, and a metal flat plate is arranged at the end of the rocker arm 5, which is used to fix the lighting device 8 and the monitoring device 9, and is used for lighting and monitoring the discharge port of the discharge joint 6. The length of the rocker arm 5 is determined according to the stator size of the potting motor so that the discharge port of the discharge joint 6 is located in the radial middle position of the potting area. The lighting device 8 and the monitoring device 9 are respectively arranged on both sides of the flat plate at the end of the rocker arm 5, and can be powered by a 220V power supply or a mobile power supply. When powered by a 220V power supply, the rotating core 3 needs to be equipped with a corresponding power supply slip ring.

[0032] Reference Figure 3 As shown, the rotating core 3 of the present invention is composed of a driving motor 3.1, a gear transmission structure 3.2 and a fixed structure 3.3. The driving motor 3.1 realizes the start and stop, rotation, reversal, speed change and other functions of the rocker arm 5.

[0033] Reference Figure 4As shown, the rotary sealing joint 4 of the present invention includes a dynamic end 4.1 connected to the discharge joint 6 and a static end 4.2 connected to the potting machine or the potting glue container outlet, and has a dynamic sealing structure inside for connecting dynamic and static pipes to ensure that there is no leakage during the potting process.

[0034] The present invention discloses a motor stator vacuum rotary potting method, which comprises the following steps:

[0035] a. Before potting, secure the rotating core 3 to the supporting platform 2, secure the rotary sealing joint 4 and rocker arm 5 to the rotating core 3, then connect the moving end 4.1 of the rotary sealing joint 4 to the discharge joint 6 with a connecting hose 7. Connect the static end of the rotary sealing joint 4 to the potting machine or the outlet of the potting glue container with a connecting hose 7. Securely secure the connecting hose 7 along the way to ensure that it does not interfere with the rotating rocker arm 5. Finally, securely secure the lighting device 8 and monitoring device 9 to both sides of the flat plate at the end of the rocker arm 5.

[0036] b. After the potting system is installed, check and confirm that all equipment is in good condition, close the sealing cover of vacuum tank 1, turn on the vacuum device of vacuum tank 1, stop vacuuming after reaching the specified vacuum degree P1, and maintain the vacuum degree P1 for time t1.

[0037] c. Turn on the motor to drive the rotating core 3 to rotate, and use the lighting device 8 and the monitoring device 9 to observe whether the rotation state is normal, the change of the liquid level and whether there is any glue leakage.

[0038] d. Discharge the material at the preset discharge speed and perform rotary potting of the motor stator; if there is no abnormality, maintain vacuum potting until the specified position; if there is an abnormality, the control button of the rotating core 3 can be used to pause the rotation of the rotating core 3 to find the cause.

[0039] e. After potting is completed, maintain the specified vacuum time t2 to ensure that all internal air escapes.

[0040] f. Gradually increase the pressure to P2 inside the vacuum tank 1 and maintain the pressure for t3 to ensure that the surface liquid level is level.

[0041] g. Gradually release the pressure in the vacuum tank 1 to normal pressure and then open the sealing cover. Take the opposite steps to the installation to dismantle the potting system piece by piece and lift the potting motor out of the vacuum tank 1 steadily.

[0042] h. According to the curing temperature requirements, move the potted motor to the oven platform for heating and curing or leave it to cure at room temperature.

[0043] In this embodiment, the vacuum tank 1 adopts a VPI paint dipping tank used in the motor industry.

[0044] In Example 1, since the diameter of the potting motor stator is relatively large, the potting motor stator is placed at the bottom of the vacuum tank 1, and the support platform is placed in the center of the potting motor stator, and its height is flush with the end of the potting motor stator.

[0045] In Example 2, the inner diameter of the potted motor stator is placed on the support platform, and the height of the rotating core is adapted to the axial length of the potted motor stator.

[0046] In this embodiment, the rotating core 3 is composed of a driving motor 3.1, a gear transmission structure 3.2 and a fixed structure 3.3, which can realize remote start and stop, reverse rotation and speed regulation within the range of 60-240s per revolution, with 10 adjustable gears.

[0047] In this embodiment, the rotary sealing joint 4 includes a moving end and a static end, and has a dynamic sealing structure inside for connecting the moving and static pipes to ensure that there is no leakage during the potting process.

[0048] In this embodiment, the lighting device 8 and the monitoring device 9 are powered by a mobile power supply, and the power supply time is longer than the process time.

[0049] In this embodiment, the vacuum degree P1 is 50-100 Pa, and the time t1 is 1 hour; the vacuum degree of 20 Pa is maintained for 0.5 hours; the pressure is gradually increased until the internal pressure P2 of the vacuum tank is 0.2 MPa, and the pressure is maintained for 1 hour.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A potting method for a motor stator vacuum rotary potting system, characterized in that: The potting system includes a vacuum tank (1) and a support platform (2) arranged in the vacuum tank (1), wherein the vacuum tank (1) is a tank body with a vacuum pumping device, a rotating core (3) driven by a motor is fixed on the support platform (2), a rotating sealing joint (4) and a rocker arm (5) are arranged on the rotating core (3), the rotating sealing joint (4) includes a moving end (4.1) connected to a discharge joint (6) and a static end (4.2) connected to the potting glue, a connecting hose (7) connected to the rotating sealing joint (4) and a metal discharge joint (6) led out of the non-metallic connecting hose (7) are fixed on the rocker arm (5), a lighting device (8) and a monitoring device (9) are arranged at the end of the rocker arm (5), the rocker arm (5) is fixed to the rotating core (3) through a pressure plate, and the lighting device (8) and the monitoring device (9) are fixed at the end of the rocker arm (5) through a flat plate; the steps are as follows: a. Fix the rotating core (3) to the supporting platform (2), fix the rotating sealing joint (4) and the rocker arm (5) to the rotating core (3), then connect the moving end (4.1) of the rotating sealing joint (4) to the discharge joint (6) with a connecting hose (7), connect the static end (4.2) of the rotating sealing joint (4) to the outlet of the potting machine or the potting glue container with a connecting hose (7), and finally fix the lighting device (8) and the monitoring device (9) on both sides of the flat plate at the end of the rocker arm (5); b. Close the sealing cover of the vacuum tank (1), start the vacuum pumping device of the vacuum tank (1), stop vacuuming after reaching the specified vacuum degree P1, and maintain the vacuum degree P1 for a time period of t1; c. Turn on the motor to drive the rotating core (3) to rotate, and observe whether the rotation state is normal, the change of the liquid level and whether there is any glue leakage through the lighting device (8) and the monitoring device (9); d. Discharging, rotating and potting the motor stator end, maintaining vacuum potting until the designated position; e. After potting is completed, maintain the specified vacuum time t2 to ensure that all internal air escapes; f. gradually pressurize the vacuum tank (1) until the internal pressure reaches P2, and maintain the pressure for t3 to ensure that the surface liquid level is flush; g. After gradually releasing the pressure in the vacuum tank (1) to normal pressure, open the sealing cover, dismantle the potting system piece by piece in the reverse order of the installation, and steadily lift the potting motor out of the vacuum tank (1).

2. The potting method of a motor stator vacuum rotary potting system according to claim 1, characterized in that: The vacuum tank (1) is a VPI paint dipping tank.

3. The potting method of a motor stator vacuum rotary potting system according to claim 1, characterized in that: The rotating core (3) is composed of a driving motor (3.1), a gear transmission structure (3.2) and a fixed structure (3.3).

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