Auxiliary tool for assembling stator and rotor of large permanent magnet motor

Abstract

The invention discloses a large permanent magnet motor stator and rotor combination auxiliary tool which comprises an air bag, a pipeline, a control device, a monitoring device and a fluid supply device, the air bag is arranged between a stator and a rotor and used for bearing magnetic attraction force of the rotor, and the pipeline is connected with the air bag, the monitoring device and the fluid supply device. The pressure in the air bag is maintained and monitored and adjusted in real time. According to the invention, the flexible air bag design is adopted, so that the motor assembling device can be suitable for assembling motors with different air gaps, a plurality of air bags are combined for use, the rotor position can be accurately adjusted according to pressure, air pressure is released after assembling is completed, and the air bags can be conveniently drawn out.

Description

Technical Field

[0001] This invention belongs to the field of motor assembly technology, specifically relating to an auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor. Background Technology

[0002] Because the rotor of a permanent magnet motor has strong magnetism, when the stator and rotor are assembled with magnets, even a slight eccentricity of the rotor will cause it to attract to the stator core. In particular, the magnetic attraction force of large permanent magnet motors can even reach hundreds of tons. Once attracted, they are difficult to separate, and forced installation will cause strong friction between the inner wall of the stator and the surface of the rotor, resulting in damage.

[0003] To prevent direct adsorption between the stator and rotor, large permanent magnet motors typically have multiple 0.5mm or 1mm thick copper shims placed between the stator and rotor during magnetized assembly to ensure proper clearance between them.

[0004] To facilitate rotor entry, the total thickness of the copper shims must be less than the air gap between the stator and rotor. Since the rotor cannot be precisely controlled at the center of the stator, it will inevitably be attracted to the stator through the copper shims.

[0005] Since the surfaces of the stator and rotor are not smooth, when the rotor is forced to slide down by external pressure and fully enters the stator cavity, the copper gaskets may be scraped off and accumulate in the air gap between the stator and rotor, making it difficult to remove the copper gaskets, or copper fragments may remain in the air gap between the stator and rotor. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor, thereby solving the problem of assembling the stator and rotor of a large permanent magnet motor.

[0007] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: an auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor, comprising several air bladders and a monitoring device and a fluid supply device connected to the air bladders respectively through pipes, and a control device connected to the monitoring device and the fluid supply device. The air bladders are evenly distributed along the circumference on a circumferential surface adapted to the inner wall of the stator. Each air bladder has one or more sealed chambers formed by a pressure plate of non-magnetic material and a flexible skirt with a certain deformation and extension capacity. The control device monitors the air pressure in each sealed chamber through the monitoring device, adjusts the pressure in each sealed chamber through the fluid supply device, and changes the thickness of the air bladders by simultaneously controlling the inflation and deflation of multiple air bladders.

[0008] The auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor described above uses gas as its fluid.

[0009] The aforementioned auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor uses a non-conductive liquid as its fluid.

[0010] The aforementioned auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor has an air bladder divided into multiple independent sealed chambers, which are connected to a monitoring device and a fluid supply device via pipelines. The air pressure of each independent chamber can be controlled independently.

[0011] The aforementioned auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor has a smooth surface on its pressure plate.

[0012] The aforementioned auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor has fixing holes on its pressure plate and / or flexible skirt.

[0013] The beneficial effects of this invention are as follows: This invention uses an airbag instead of copper gaskets, allowing the rotor's eccentricity direction to be determined by internal pressure (air pressure), and the rotor's center position to be adjusted by regulating the internal pressure. The airbag's flexible design on both sides allows it to be used with permanent magnet motors with different air gaps. The airbag of this invention provides both support and flexibility, preventing metal fragments from being generated by rotor scraping. After the stator and rotor are assembled, the airbag pressure can be released, facilitating the complete removal of the airbag. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram illustrating how the present invention is used;

[0016] Figure 3 This is a cross-sectional view of the airbag of the present invention;

[0017] Figure 4 This is a schematic diagram of a single airbag of the present invention.

[0018] The reference numerals for each figure are as follows: 1—stator, 2—airbag, 21—pressure plate, 22—flexible skirt, 23—fixing hole, 3—rotor, 4—pipeline, 5—control device, 61—monitoring device, 62—fluid supply device. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the directional terms such as "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0021] Example 1

[0022] This invention discloses an auxiliary tooling for assembling the stator and rotor of a large permanent magnet motor, such as... Figure 1 and Figure 2 As shown, it includes a stator 1, an air bladder 2, a rotor 3, a pipe 4, a control device 5, a monitoring device 61, and a fluid supply device 62. In this embodiment, the pipe 4 is an air pipe, and the fluid supply device 62 is an inflation device.

[0023] The airbag 2 is placed inside the stator 1. The air tube connects the airbag 2, the monitoring device 61, the inflation device, and the control device 5. Multiple airbags 2 are evenly arranged along the circumferential surface of the stator 1, which is adapted to the inner wall surface of the stator 1. The airbags 2 are controlled by the control device 5 via the air tube, the monitoring device 61, and the inflation device.

[0024] like Figure 3 and Figure 4 As shown, the airbag 2 includes a pressure plate 21 made of non-magnetic material and a flexible skirt 22 with a certain deformation and extension capacity. The flexible skirt 22 is arranged on both sides. The surface of the pressure plate 21 is smooth and will not damage the inner wall of the stator 1. The pressure plate 21 and the flexible skirt 22 form a sealed air cavity. The thickness of the airbag 2 can be changed by inflating and deflating. The airbag 2 is fixed to the stator 1 by bolts or cables through fixing holes 23.

[0025] The control device 5 monitors the air pressure of each airbag 2 through the monitoring device 61, adjusts the air pressure of each airbag 2 through the inflation device, and changes the thickness of the airbag 2 by simultaneously controlling the inflation and deflation of multiple airbags 2.

[0026] During assembly and use, the airbags 2 are evenly arranged along the inner wall of the stator 1, and the rotor 3 is slowly pushed into the stator 1. Based on the theoretically calculated magnetic attraction force, the airbags 2 are inflated with gas and a certain pressure is maintained. During the rotor 3's entry into the stator 1, the monitoring device 61 monitors the gas pressure changes of each airbag 2 in real time to determine the rotor 3's eccentricity. The inflation and deflation of the inflation device is used to adjust the gas pressure of each airbag 2 in real time, ensuring that the rotor 3 enters the stator 1 along the centerline as much as possible. After assembly, the gas inside the airbags 2 is released, and then all airbags 2 are extracted, completing the stator-rotor assembly.

[0027] In this embodiment, there are a total of 8 airbags 2, and each airbag 2 is connected to the monitoring device 61 and the inflation device through an air tube.

[0028] Example 2

[0029] The difference from Embodiment 1 is that the fluid is a non-conductive liquid. That is, the gas in the airbag 2, pipe 4, monitoring device 61, and fluid supply device 62 is replaced with a non-conductive liquid.

[0030] Example 3

[0031] The difference from Embodiment 1 is that the airbag can be divided into multiple independent sealed chambers, and each independent sealed chamber is independently connected to the monitoring device 61 and the inflation device through an air tube, so that the control device 5 can independently control the air pressure.

[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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large permanent magnet motor stator-rotor assembly auxiliary tool, characterized in that: The application relates to a kind of air bags (2) and the monitoring device (61) and fluid supply device (62) connected by pipeline (4) respectively, and further comprising control device (5) connected with monitoring device (61) and fluid supply device (62), the air bag (2) is uniformly distributed on the circumference of the inner wall of stator (1), the air bag (2) has one or more closed chambers formed by pressure plate (21) of non-magnetic material and flexible skirt (22) connection, control device (5) monitors the air pressure in each closed chamber through monitoring device (61), adjusts the pressure in each closed chamber through fluid supply device (62), and changes the thickness of air bag (2) by simultaneously controlling the fluid charging and discharging of multiple air bags (2).

2. A kind of large permanent magnet motor stator-rotor combined auxiliary tooling according to claim 1, characterized in that, The fluid is a gas.

3. The auxiliary tool for assembling the stator and rotor of a large permanent magnet motor according to claim 1, characterized in that, The fluid is a non-conductive liquid.

4. A kind to be combined with the auxiliary tooling of large permanent magnet motor stator-rotor according to claim 1 or 2 or 3, with the characteristics that, Each independent closed chamber in the air bag (2) is connected with monitoring device (61) and fluid supply device (62) through pipeline (4).

5. A large permanent magnet motor stator-rotor assembly auxiliary tooling according to claim 4, characterized in that, The surface of the pressure plate (21) is smooth.

6. A large permanent magnet motor stator-rotor assembly auxiliary tooling according to claim 5, characterized in that, The pressure plate (21) or / and flexible skirt (22) is provided with a fixing hole (23).

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