Motor capable of preventing axial movement

Abstract

The utility model relates to a motor capable of preventing axial movement, which solves the problem in the prior art that a rotor shaft is easy to axially move, and adopts the technical scheme that the motor comprises an end cover, a thrust bearing arranged in the end cover, and a rotor shaft of which the outer end is connected with the thrust bearing, the motor is characterized in that a limiting adjusting assembly is arranged between the end cover and the thrust bearing, and the limiting adjusting assembly enables the thrust bearing and the rotor shaft to be matched so as to prevent the rotor shaft from axially moving. The beneficial effects of the motor are that through the arrangement of the limiting adjustment assembly, the thrust bearing and the rotor shaft form axial limiting cooperation for preventing the rotor shaft from axial movement, thereby facilitating the stabilization of the operation performance of the motor and prolonging the service life of the motor; appropriate noise of the motor can be kept, and the influence of the motor noise on the environment can be improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a motor capable of preventing axial movement. Background Art

[0002] The lower structure of existing submersible motors for wells typically includes a lower bearing seat, a lower sliding bearing, a thrust bearing seat, a thrust bearing, and an end cap for positioning the rotor shaft. Adjusting the thrust bearing's axial position, and thus the rotor shaft's axial position, is achieved via an adjusting screw, thereby improving the motor's axial assembly accuracy. However, because the adjusting screw is a single-threaded connector, it is susceptible to loosening or displacement due to external forces or vibration during use. This can cause axial movement of the rotor shaft, leading to problems such as loud operating noise, performance degradation, and even inoperability. Summary of the Invention

[0003] The purpose of the present utility model is to solve the above-mentioned problems existing in the prior art and to provide a motor with anti-axial movement. By setting a limit adjustment component, the thrust bearing and the rotor shaft form an axial limit fit to prevent the axial movement of the rotor shaft, thereby stabilizing the motor's operating performance and improving the motor's service life; it is also beneficial to maintaining the motor's appropriate noise level and improving the impact of the motor's noise on the environment.

[0004] The above technical objectives of the present invention are primarily achieved through the following technical solutions: a motor that prevents axial movement, comprising an end cap, a thrust bearing disposed within the end cap, and a rotor shaft whose outer end engages with the thrust bearing, characterized in that a limit adjustment assembly is disposed between the end cap and the thrust bearing, the limit adjustment assembly enabling the thrust bearing to engage with the rotor shaft to prevent axial movement of the rotor shaft. By providing the limit adjustment assembly, the thrust bearing and the rotor shaft form an axial limit engagement to prevent axial movement of the rotor shaft, thereby stabilizing the motor's operating performance and increasing its service life; maintaining appropriate motor noise levels, and improving the environmental impact of motor noise.

[0005] As a further improvement and supplement to the above-mentioned technical solution, the present invention employs the following technical measures: the position-limiting adjustment assembly includes an adjusting member and a position-limiting plate. The adjusting member extends through the end cap, the inner end of the adjusting member abuts against the outer end of the thrust bearing, and the position-limiting plate engages with the outer end of the adjusting member to prevent rotation and axial position-limiting engagement. The position-limiting plate is used to axially limit the position of the adjusting member against the thrust bearing, thereby relatively fixing the position of the rotor shaft and preventing axial movement of the rotor shaft.

[0006] Preferably, the cross section of the outer end of the adjusting member is non-rotating, and a limiting through hole is provided in the middle area of ​​the limiting plate. The shape of the limiting through hole matches the shape of the cross section of the outer end of the adjusting member, and the outer end of the adjusting member is inserted into the limiting through hole to form a rotation-stop fit. Non-rotating shapes include polygons such as rectangles, triangles, and pentagons, as well as ellipses, special-shaped structures with closed curves whose outer circumferences are non-circular, etc. The cross section of the outer end of the adjusting member is non-rotating, and when it cooperates with the limiting through hole on the limiting plate, a rotation-stop fit can be formed, thereby avoiding axial displacement of the adjusting member when it is affected by external forces or vibrations during the operation of the motor, thereby ensuring the stability of the thrust bearing position, and then ensuring the stable operation of the rotor shaft, and preventing axial movement.

[0007] Preferably, the middle section of the adjusting member is a threaded section that is threadedly connected to the end cap. The inner diameter of the threaded section is greater than or equal to the diameter of the circumscribed circle of the outer end of the adjusting member. The outer end of the threaded section presses against the inner end surface of the limit plate to form an axial limit fit. When the outer end of the adjusting member is restrained and axially limited by the limit plate, the adjusting member is stably fixed in the end cap and acts stably on the thrust bearing, thereby preventing axial movement of the rotor shaft.

[0008] Preferably, the inner end of the adjusting member has a convex spherical cap-shaped end surface, and the thrust bearing is provided with a recessed spherical cap-shaped groove corresponding to the adjusting member. The inner end of the adjusting member is inserted into the spherical cap-shaped groove to form a press fit. This helps absorb unexpected runout of the rotor shaft, ensuring stable operation of the rotor shaft and improving motor performance.

[0009] Preferably, the stop plate is spherically shaped, with its center located on the axis of the rotor shaft. The end cap is provided with a mounting slot, into which the stop plate is embedded, and is secured to the end cap via an axially connected connector. The spherical stop plate exerts a radial force component on the connector, thereby facilitating the connector's stable fixation of the stop plate and end cap, preventing the end cap from loosening, thereby ensuring the stability of the adjustment member's connection and further enhancing the rotor shaft's ability to prevent axial movement.

[0010] The first technical solution involved in the present utility model is that there are multiple positioning holes and they are centrally symmetrically distributed, and the fixing holes are in one or several groups. Specifically:

[0011] The limiting plate is provided with a plurality of circumferentially distributed positioning holes, and the end cap is provided with at least one group of fixing holes, each group of at least two fixing holes. The fixing holes are arranged in correspondence with the corresponding positioning holes, allowing a fixing member to pass through the positioning holes and enter the fixing holes to form a detachable fixed connection. This facilitates the insertion of the connecting member into the positioning holes and fixing holes in the appropriate positions according to actual conditions, improves the assembly accuracy of the adjusting member, and further improves the axial assembly accuracy of the thrust bearing and the rotor shaft, thereby also helping to improve the ability of the rotor shaft to prevent axial movement.

[0012] Preferably, the positioning holes are n waist-shaped holes distributed symmetrically around the center, with the angle between adjacent positioning holes being α. Each group of fixing holes is composed of m circular threaded holes, with the angle between adjacent fixing holes in each group being β. The connecting member is a screw or bolt with a single thread. When the connecting member is adjusted from one fixing hole to an adjacent fixing hole, the rotation angle of the limit plate is |α-β| / 2. The axial adjustment distance of the adjusting member is d = S*(|α-β| / 2) / 360, where S is the lead of the adjusting member. Determining the axial adjustment distance determines the assembly accuracy of the adjusting member, thereby determining the axial assembly accuracy of the thrust bearing and the rotor shaft, which is beneficial for determining the accuracy of the rotor shaft's anti-axial movement.

[0013] The second technical solution of the present invention is that the positioning holes are arranged in one or several groups, and the fixing holes are arranged in a centrally symmetrical manner. In other words, the difference between the first technical solution and the second technical solution lies in the difference in the arrangement of the positioning holes and the fixing holes. Specifically:

[0014] At least one group of positioning holes is provided on the limiting plate, and each group of positioning holes is at least two waist-shaped holes. A plurality of circumferentially distributed fixing holes are provided on the end cover, and the fixing holes are provided corresponding to the corresponding positioning holes, so that the fixing parts pass through the positioning holes and enter the fixing holes to form a detachable fixed connection.

[0015] Preferably, each group of positioning holes is n waist-shaped holes and is centrally symmetrically distributed, the angle between adjacent positioning holes in each group is α, the fixing holes are m circular threaded holes that are centrally symmetrically distributed, the angle between adjacent fixing holes is β, the connecting member is a screw or bolt with a single thread, when the connecting member is adjusted from one fixing hole to an adjacent fixing hole, the rotation angle of the limit plate is |α-β| / 2, the axial adjustment distance of the adjusting member d=S*(|α-β| / 2) / 360, and S is the lead of the adjusting member.

[0016] The present invention has the following beneficial effects: 1. By providing a limit adjustment assembly, the thrust bearing and the rotor shaft form an axial limit fit, preventing axial movement of the rotor shaft, thereby stabilizing the motor's operating performance and increasing its service life; maintaining a suitable motor noise level, and improving the environmental impact of the motor noise. 2. The limit plate radially stops the adjustment member from rotating and axially preventing the adjustment member from thrusting, effectively limiting the thrust bearing in the axial direction, thereby keeping the rotor shaft relatively fixed and preventing axial movement of the rotor shaft. 3. The limit plate is spherical, not flat. The connecting member securing the limit plate to the end cap is subjected to radial force from the limit plate, ensuring a stable fixation to the end cap and preventing loosening, thereby ensuring that the limit adjustment assembly effectively limits the thrust bearing in the axial direction. 4. Positioning holes and fixing holes are respectively provided on the limit plate and the end cap, and there are at least two configuration options for the positioning holes and fixing holes, facilitating adjustment of the connecting member's fixed position based on the position of the thrust bearing after the adjustment member adjusts the thrust bearing. 5. The arrangement of the positioning holes and the fixing holes is conducive to ensuring the adjustment accuracy of the adjusting parts and the fixed connection accuracy of the connecting parts, which is ultimately beneficial to the assembly accuracy of the rotor shaft, which is conducive to reducing the possibility of rotor shaft movement and reducing vibration and noise during motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a sectional partial structure of the utility model.

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0019] Figure 3 It is a partial structural diagram of the utility model.

[0020] Figure 4 yes Figure 3 Schematic diagram of a local explosion structure.

[0021] Figure 5 yes Figure 3 Schematic diagram of the partial explosion structure of another structure.

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the limiting plate involved in the utility model.

[0023] Figure 7 It is a structural schematic diagram of the limiting plate involved in the utility model.

[0024] Figure 8 This is another structural schematic diagram of the limiting plate involved in the utility model.

[0025] Figure 9This is a schematic diagram of the first structure of the end cover involved in the utility model.

[0026] Figure 10 This is a second structural schematic diagram of the end cover involved in the present utility model.

[0027] Figure 11 This is a third structural schematic diagram of the end cover involved in the utility model.

[0028] In the figure: 1. End cover; 2. Thrust bearing; 3. Rotor shaft; 4. Adjusting part; 5. Limiting plate; 6. Outer end; 7. Limiting through hole; 8. Threaded section; 9. Inner end; 10. Mounting slot; 11. Positioning hole; 12. Fixing hole; 13. Connecting part. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0030] Example 1: A motor that prevents axial movement includes an end cover 1, a thrust bearing 2 arranged in the end cover 1, and a rotor shaft 3 whose outer end is matched with the thrust bearing 2.

[0031] The difference between this technical solution and the prior art is that a limit adjustment component is provided between the end cover 1 and the thrust bearing 2 , and the limit adjustment component enables the thrust bearing 2 to cooperate with the rotor shaft 3 to prevent the rotor shaft 3 from axial movement.

[0032] This technical solution provides a limit adjustment component to form an axial limit fit between the thrust bearing 2 and the rotor shaft 3, which is used to prevent the rotor shaft 3 from axial movement, thereby stabilizing the motor's operating performance and improving the motor's service life; it is also beneficial to maintaining appropriate motor noise and improving the impact of motor noise on the environment.

[0033] Next, the above technical solution will be described in detail:

[0034] The limit adjustment assembly includes an adjustment member 4 and a limit plate 5. The adjustment member 4 extends through the end cap 1. The inner end 9 of the adjustment member 4 presses against the outer end of the thrust bearing 2. The limit plate 5 cooperates with the outer end of the adjustment member 4 to prevent rotation and axial position. The limit plate 5 is used to axially limit the adjustment member 4 against the thrust bearing 2, thereby relatively fixing the position of the rotor shaft 3 and preventing axial movement of the rotor shaft 3.

[0035] In actual application, the cross section of the outer end 6 of the adjusting member 4 is non-rotatable, and a limiting through hole 7 is provided in the middle area of ​​the limiting plate 5. The shape of the limiting through hole 7 is adapted to the cross section of the outer end 6 of the adjusting member 4, and the outer end 6 of the adjusting member 4 is inserted into the limiting through hole 7 to form a non-rotatable fit. Non-rotatable shapes include polygons such as rectangles, triangles, and pentagons, as well as ellipses, special-shaped structures with closed curves whose outer circumferences are non-circular, etc. In this embodiment, the cross section of the outer end 6 of the adjusting member 4 is rectangular or square, and the limiting through hole 7 is a corresponding rectangle or square. The cross section of the outer end 6 of the adjusting member 4 is non-rotatable, and when matched with the limiting through hole 7 on the limiting plate 5, a non-rotatable fit can be formed, thereby preventing the adjusting member 4 from axial displacement when affected by external forces or vibrations during the operation of the motor, thereby ensuring the stable position of the thrust bearing 2, and then ensuring the stable operation of the rotor shaft 3, and preventing axial movement.

[0036] In practice, the middle section of the adjusting member 4 is a threaded section 8, which is threadedly connected to the end cap 1. The inner diameter of the threaded section 8 is greater than or equal to the diameter of the circumscribed circle of the outer end 6 of the adjusting member 4. The outer end 6 of the threaded section 8 presses against the inner end 9 of the stop plate 5 to form an axial stop. When the outer end 6 of the adjusting member 4 is stopped and axially restrained by the stop plate 5, the adjusting member 4 is stably fixed in the end cap 1 and acts stably on the thrust bearing 2, thereby preventing axial movement of the rotor shaft 3.

[0037] In actual use, the inner end 9 of the adjusting member 4 is a convex spherical cap-shaped end surface, and the thrust bearing 2 is provided with a recessed spherical cap-shaped groove corresponding to the adjusting member 4. The inner end 9 of the adjusting member 4 is inserted into the spherical cap-shaped groove to form a press fit. This helps to absorb unexpected runout of the rotor shaft 3, ensuring stable operation of the rotor shaft 3 and improving motor performance.

[0038] In actual use, the stop plate 5 is spherically shaped, with its center located on the axis of the rotor shaft 3. The end cap 1 is provided with a mounting slot 10, into which the stop plate 5 is inserted and secured to the end cap 1 via an axially connected connector 13. The spherical stop plate 5 exerts a radial force on the connector 13, thereby stabilizing the connection between the stop plate 5 and the end cap 1, preventing the end cap 1 from loosening. This ensures the connection stability of the adjustment member 4 and further helps prevent axial movement of the rotor shaft 3.

[0039] The first technical solution involved in the present utility model is that the positioning holes 11 are multiple and centrally symmetrically distributed, and the fixing holes 12 are one or several groups. Specifically:

[0040] The limiting plate 5 is provided with a plurality of circumferentially distributed positioning holes 11. The end cap 1 is provided with at least one set of fixing holes 12, each set of at least two fixing holes 12. The fixing holes 12 are arranged in correspondence with the corresponding positioning holes 11, allowing a fixing member to pass through the positioning holes 11 and into the fixing holes 12 to form a detachable fixed connection. This facilitates the insertion of the connecting member 13 through the positioning holes 11 and fixing holes 12 in the appropriate positions according to actual conditions, thereby improving the assembly accuracy of the adjusting member 4, thereby improving the axial assembly accuracy of the thrust bearing 2 and the rotor shaft 3, and thus improving the ability of the rotor shaft 3 to prevent axial movement.

[0041] In practical applications, the positioning holes 11 are n waist-shaped holes distributed symmetrically around the center, with the angle between adjacent positioning holes 11 being α. Each group of fixing holes 12 is composed of m circular threaded holes, with the angle between adjacent fixing holes 12 in each group being β. The connecting member 13 is a screw or bolt with a single thread. When the connecting member 13 is adjusted from one fixing hole 12 to an adjacent fixing hole 12, the rotation angle of the limit plate 5 is |α-β| / 2. The axial adjustment distance of the adjusting member 4 is d = S*(|α-β| / 2) / 360, where S is the lead of the adjusting member 4. Determining the axial adjustment distance determines the assembly accuracy of the adjusting member 4, thereby determining the axial assembly accuracy of the thrust bearing 2 and the rotor shaft 3, which facilitates determining the accuracy of the rotor shaft 3 in preventing axial movement.

[0042] In practical applications, such as Figure 7 As shown, the positioning holes 11 can be 12 waist-shaped holes distributed symmetrically around the center, and the angle between adjacent positioning holes 11 is 30°.

[0043] like Figure 8 As shown, the positioning holes 11 can be 8 waist-shaped holes distributed symmetrically around the center, and the angle between adjacent positioning holes 11 is 45°.

[0044] like Figure 9 As shown, two groups of fixing holes 12 (such as threaded holes) are provided on the end cover 1, and each group is provided with three positioning holes 11. Figure 10 As shown, Figure 9 The difference shown is that the two groups of positioning holes 11 are set at different positions, and the angle between the two groups of positioning holes 11 is 125 degrees. Figure 11 As shown, 9 fixing holes 12 are evenly distributed on the end cover 1 in a centrally symmetrical manner, and the angle between adjacent fixing holes 12 is 40°. Regardless of the number of positioning holes 11 on the limiting plate 5, you can choose Figures 9-11 The end cover 1 of any one of the solutions shown is matched.

[0045] Specifically: Figure 7As shown, there are 12 positioning holes 11 distributed at equal angles, so the angle between each positioning hole 11 is 30°, the adjustment error is equivalent to the maximum error of the limit plate 5 is 15°, the minimum axial adjustment spacing of the adjusting part 4 (adjusting screw) is d, the lead S of the adjusting part 4 (the adjusting screw is a single-thread or double-thread thread), then d=S*15 / 360, so that the adjustment error of the adjusting part 4 can be accurately controlled.

[0046] like Figure 9 As shown, corresponding to the fixing holes 12 on the end cover 1, the fixing holes 12 are symmetrically arranged in two groups, with three fixing holes 12 in each group, and the angle between two adjacent fixing holes 12 is 20°. At this time, the minimum adjustable angle of the limit plate 5 is 10°, and the maximum error of the corresponding limit plate 5 is 5°, then d=S*5 / 360, so the adjustment error of the adjustment member 4 can also be accurately controlled.

[0047] If there are multiple groups of fixing holes 12, the groups are not distributed at equal angles, such as Figure 10 As shown, there are two groups of fixing holes 12, each group is provided with three fixing holes 12, and the angle between the two groups is 125°. If the angle of one group of fixing holes 12 is set to 0° (based on the center of the fixing hole 12 in the middle position), and the angle of the other group is 125° (4*30°+5°), then the limit plate 5 has two groups with two minimum adjustable angles of 10°, and the angle difference between the two groups can be adjusted to 5°, then the maximum error of the corresponding limit plate 5 is 2.5°, then d=S*2.5 / 360, in this way, the adjustment error of the adjustment member 4 can be further accurately controlled.

[0048] Such as 8 and Figure 11 As shown, if the adjustment holes are eight adjustment holes that are evenly distributed and symmetrically distributed along the center, and the fixing holes 12 are nine adjustment holes that are evenly distributed and symmetrically distributed along the center, then the minimum adjustable angle of the limit plate 5 is 5°, and the corresponding maximum error adjustment value of the limit plate 5 is 2.5°. At this time, d=S*2.5 / 360. In this way, the adjustment error of the adjustment member 4 can be controlled more accurately.

[0049] Furthermore, the angle between two adjacent positioning holes 11 is β, the number of positioning holes 11 is n, and n*A=360; similarly, the angle between two adjacent groups of fixing holes 12 is α, the maximum number of groups of fixing holes 12 is M, and the number of fixing holes 12 in each group is m, M*m*B=360, then the least common multiple of αβ is C=m*β, as Figure 7-Figure 9 As shown, 60°=3*20°; at this time, the minimum adjustable angle of the limit plate 5 is |α-β|, and the corresponding maximum error of the limit plate 5 is |AB| / 2, so d=S*(|AB| / 2) / 360.

[0050] Example 2: The second technical solution of the present invention is that the positioning holes 11 are arranged in one or several groups, and the fixing holes 12 are arranged in a plurality of groups and are centrally symmetrically distributed. In other words, the difference between the first technical solution (i.e., the solution disclosed in Example 1) and the second technical solution lies in the difference in the arrangement of the positioning holes 11 and the fixing holes 12. Specifically:

[0051] At least one group of positioning holes 11 is provided on the limiting plate 5, and each group of positioning holes 11 is at least two waist-shaped holes. A plurality of circumferentially distributed fixing holes 12 are provided on the end cover 1, and the fixing holes 12 are provided corresponding to the corresponding positioning holes 11, so that the fixing parts pass through the positioning holes 11 and enter the fixing holes 12 to form a detachable fixed connection.

[0052] In actual application, each group of the positioning holes 11 is n waist-shaped holes and is centrally symmetrically distributed. The angle between adjacent positioning holes 11 in each group is α. The fixing holes 12 are m circular threaded holes that are centrally symmetrically distributed. The angle between adjacent fixing holes 12 is β. The connecting member 13 is a screw or bolt with a single thread. When the connecting member 13 is adjusted from one fixing hole 12 to an adjacent fixing hole 12, the rotation angle of the limit plate 5 is |α-β| / 2, and the axial adjustment distance d of the adjusting member 4 is d=S*(|α-β| / 2) / 360, where S is the lead of the adjusting member 4.

[0053] For Example 2, the principles of examples of relevant parameters of the positioning hole 11 and the fixing hole 12 are the same as those of Example 1. To avoid redundancy, the corresponding examples are omitted in this embodiment.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are possible in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor with an anti-axial movement function, comprising an end cover (1), a thrust bearing (2) disposed in the end cover (1), and a rotor shaft (3) whose outer end is engaged with the thrust bearing (2), characterized in that A limit adjustment component is provided between the end cover (1) and the thrust bearing (2), and the limit adjustment component enables the thrust bearing (2) to form an axial limit fit with the rotor shaft (3) to prevent the rotor shaft (3) from axial movement.

2. The motor with anti-axial movement according to claim 1, characterized in that The limit adjustment assembly comprises an adjustment member (4) and a limit plate (5); the adjustment member (4) passes through the end cover (1); the inner end (9) of the adjustment member (4) presses against the outer end of the thrust bearing (2); the limit plate (5) and the outer end (6) of the adjustment member (4) are rotationally fixed and axially limited.

3. The motor with anti-axial movement according to claim 2, characterized in that The cross section of the outer end (6) of the adjusting member (4) is non-rotatable, and a limiting through hole (7) is provided in the middle area of ​​the limiting plate (5). The shape of the limiting through hole (7) is adapted to the cross section of the outer end (6) of the adjusting member (4), and the outer end (6) of the adjusting member (4) is inserted into the limiting through hole (7) to form a rotation-stopping fit.

4. The motor with anti-axial movement according to claim 3 is characterized in that The middle section of the adjusting member (4) is a threaded section (8), which is threadedly connected to the end cover (1). The inner diameter of the threaded section (8) is greater than or equal to the diameter of the circumscribed circle of the outer end (6) of the adjusting member (4). The outer end of the threaded section (8) presses against the inner end surface of the limiting plate (5) to form an axial limiting fit.

5. The motor with anti-axial movement according to claim 4 is characterized in that The inner end (9) of the adjusting member (4) is a convex spherical crown end surface, and the thrust bearing (2) is provided with a concave spherical crown groove corresponding to the position of the adjusting member (4). The inner end (9) of the adjusting member (4) is inserted into the spherical crown groove to form a press fit.

6. The motor with anti-axial movement function according to any one of claims 2 to 5, characterized in that The limiting plate (5) is in the shape of a spherical cap, with its center located on the axis of the rotor shaft (3); the end cover (1) is provided with a mounting groove (10); the limiting plate (5) is embedded in the mounting groove (10) and is fixed to the end cover (1) via an axially connected connector.

7. The motor with anti-axial movement according to claim 6, characterized in that The limiting plate (5) is provided with a plurality of circumferentially distributed positioning holes (11), and the end cover (1) is provided with at least one group of fixing holes (12), each group of the fixing holes (12) having at least two fixing holes. The fixing holes (12) are provided in correspondence with the corresponding positioning holes (11), so as to allow a fixing member to pass through the positioning hole (11) and enter the fixing hole (12) to form a detachable fixed connection.

8. The motor with anti-axial movement according to claim 7, characterized in that The positioning holes (11) are n waist-shaped holes and are centrally symmetrically distributed. The angle between adjacent positioning holes (11) is α. Each group of fixing holes (12) is m circular threaded holes. The angle between adjacent fixing holes (12) in each group is β. The connecting member (13) is a screw or bolt with a single thread. When the connecting member (13) is adjusted from one fixing hole (12) to an adjacent fixing hole (12), the rotation angle of the limiting plate (5) is |α-β| / 2. The axial adjustment distance d of the adjusting member (4) is S*(|α-β| / 2) / 360, and S is the lead of the adjusting member (4).

9. The motor with anti-axial movement according to claim 6, characterized in that At least one group of positioning holes (11) is provided on the limiting plate (5), and each group of positioning holes (11) is at least two waist-shaped holes. A plurality of circumferentially distributed fixing holes (12) are provided on the end cover (1), and the fixing holes (12) are provided correspondingly to the corresponding positioning holes (11), so as to allow a fixing member to pass through the positioning hole (11) and enter the fixing hole (12) to form a detachable fixed connection.

10. The motor with anti-axial movement according to claim 9, characterized in that Each group of positioning holes (11) is n waist-shaped holes and is centrally symmetrically distributed. The angle between adjacent positioning holes (11) in each group is α. The fixing holes (12) are m circular threaded holes that are centrally symmetrically distributed. The angle between adjacent fixing holes (12) is β. The connecting member (13) is a screw or bolt with a single thread. When the connecting member (13) is adjusted from one fixing hole (12) to an adjacent fixing hole (12), the rotation angle of the limiting plate (5) is |α-β| / 2. The axial adjustment distance d of the adjusting member (4) is S*(|α-β| / 2) / 360, and S is the lead of the adjusting member (4).

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