Permanent magnet motor suitable for oilfield pumping equipment

Abstract

The utility model relates to permanent magnet motor technical field, concretely relates to a kind of permanent magnet motor suitable for oilfield pumping equipment, including speed reducer, the input end of speed reducer is fixedly connected with input shaft, the outside of one end of input shaft is fixedly connected with shaft sleeve, the outer wall of shaft sleeve is fixedly connected with rotor iron core, the outer wall of rotor iron core is fixedly connected with multiple equidistance evenly distributed permanent magnet, the outer wall of speed reducer near input shaft is fixedly connected with mounting flange, the side wall of mounting flange is provided with front end cover, and the side wall of front end cover is provided with machine shell.Compared with prior art, after the structure design of increasing air gap is used, even if slight axial displacement or radial swing occurs in the running process of rotor iron core, the interference between permanent magnet and stator iron core can be effectively avoided, and the reliability and adaptability of motor under high impact, high vibration working condition are improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a permanent magnet motor suitable for oilfield pumping equipment. Background Technology

[0002] With the continuous development of the petroleum industry, the automation and intelligence of oilfield pumping equipment are constantly improving, placing higher demands on the reliability, efficiency, energy saving, and ease of maintenance of drive motors. In recent years, permanent magnet motors have gradually been applied in petroleum machinery equipment due to their advantages such as high power density, high efficiency, low loss, and simple structure. Disc-type permanent magnet motors, as a new type of permanent magnet motor, have advantages such as flat size, short axial length, small moment of inertia, and fast response speed. They are particularly suitable for applications with limited space and high torque output requirements, thus showing good application prospects in equipment such as pumping units. However, existing permanent magnet motors generally adopt a structural design with a small air gap between the rotor and stator, for example, an air gap set to within 1mm, to improve magnetic flux density and motor efficiency. However, in the oilfield well environment, this type of small air gap design has certain limitations and risks.

[0003] Oilfield pumping operations take place in a complex and harsh environment. Equipment is often affected by multiple factors such as mud and sand erosion, strong vibration, mechanical impact, and drastic temperature changes. Under such conditions, the motor rotor may experience slight wobble or axial movement during operation. If the air gap between the stator and rotor is set too small, it will significantly increase the risk of them rubbing against each other, which can easily lead to equipment damage or even motor shutdown, seriously affecting the continuity of pumping operations and the safety of on-site operation. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a permanent magnet motor suitable for oilfield pumping equipment, so as to solve the problem that if the air gap between the stator and rotor is set too small, it will significantly increase the risk of collision between the two, which can easily cause equipment damage or even motor shutdown, seriously affecting the continuity of pumping operations and the safety of on-site operation.

[0005] Based on the above objectives, this utility model provides a permanent magnet motor suitable for oilfield pumping equipment, including a reducer. An input shaft is fixedly connected to the input end of the reducer. A bushing is fixedly connected to the outer side of one end of the input shaft. A front end cover is fixedly connected to the outer wall of the bushing. Multiple equidistant and evenly distributed permanent magnets are fixedly connected to the outer wall of the front end cover. A mounting flange is fixedly connected to the outer wall of the reducer near the input shaft. A stator core is fixedly connected to the side wall of the mounting flange. A housing is provided on the side wall of the stator core. A rear end cover is provided on the side of the housing away from the front end cover. A stator outer shell is fixedly connected to the inner wall of the housing. Multiple equidistant and evenly distributed stator cores are fixedly connected to the inner wall of the stator outer shell. Winding wires are sleeved on the outer wall of the stator cores. An air gap of 2mm is formed between the permanent magnets and the stator cores. A connecting mechanism is provided between the bushing and the outer wall of the input shaft.

[0006] Preferably, the connecting mechanism includes a first positioning groove formed on the top of the inner wall of the bushing, a corresponding groove formed at one end of the input shaft near the bushing, a second positioning pin fixedly connected to the inner wall of the corresponding groove, a keyway hole formed on the outer wall of the bushing, one end of the outer wall of the keyway hole communicating with the side wall of the bushing, a second positioning groove formed on the inner wall of the rotor core, and a first positioning pin inserted between the opposite surfaces of the keyway hole and the second positioning groove.

[0007] Preferably, the second positioning groove between the corresponding groove and the inner wall of the first positioning groove are mutually adapted.

[0008] Preferably, a positioning block is fixedly connected to the side wall of the housing, the side wall of the positioning block is provided with a positioning hole, and a positioning post is fixedly connected to the side wall of the front cover, one end of the positioning post passing through the positioning hole.

[0009] Preferably, a plurality of equally spaced and uniformly distributed limiting bolts are threaded between the side wall of the bushing and the side wall of the rotor core.

[0010] Preferably, the end of the second positioning slightly away from the reducer is shaped as a first arc-shaped portion, and the end of the first positioning slightly closer to the reducer is shaped as a second arc-shaped portion.

[0011] Preferably, the top of the housing is provided with two lifting rings for suspending the housing.

[0012] The beneficial effects of this utility model are:

[0013] 1. This permanent magnet motor, suitable for oilfield pumping equipment, significantly improves the operational stability of the equipment under complex working conditions by setting the air gap between the rotor core and stator core to 2mm, which is larger than the traditional design. Due to the harsh environment of oilfield well sites, which are often accompanied by ground subsidence, structural vibration, and slight shaft oscillation, the small air gap in the traditional design can easily cause the permanent magnets on the rotor to come into contact or rub against the stator core, leading to motor damage or shutdown. With the structural design of increasing the air gap, even if the rotor core experiences slight axial displacement or radial oscillation during operation, interference between the permanent magnets and the stator core can be effectively avoided. This improves the reliability and adaptability of the motor under high impact and high vibration conditions, ensures continuous and stable power output of the pumping equipment, extends the service life of the equipment, and reduces the frequency of on-site maintenance.

[0014] 2. This permanent magnet motor, suitable for oilfield pumping equipment, achieves precise positioning between the input shaft and the bushing through the cooperation of a first locating groove and a corresponding groove, and a second locating pin in the axial direction. A stable connection between the bushing and the rotor core is achieved through the first locating pin inserted between the keyway hole and the second locating groove. Furthermore, circumferential fixing by multiple limiting bolts effectively prevents rotational loosening or offset. The first and second arc-shaped parts in the structure not only improve alignment accuracy but also make the installation process smoother, reducing assembly difficulty and damage risk. The overall structure achieves multiple positioning and reliable fastening in the axial, radial, and circumferential directions, significantly improving the transmission stability and operational safety between the motor and the reducer, providing strong support for the efficient and long-term operation of the motor.

[0015] 3. This permanent magnet motor, suitable for oilfield pumping equipment, features a tapered structure between the threaded section and the bolt head. This allows the bolt to automatically align itself when the motor is installed and screwed into the threaded hole on the mounting flange. One end of the bolt has an outer diameter of 22mm, which transitions into the 22mm threaded hole on the mounting flange, preventing gaps and effectively improving connection accuracy. While tightening the connection, the bolt also acts as a locating pin, ensuring precise positioning between the front cover and the mounting flange. This prevents structural loosening and displacement caused by axial torque during motor operation, improving the overall stability and reliability of the connection between the motor and the reducer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the input shaft and lifting ring of this utility model;

[0019] Figure 3 This is a three-dimensional exploded view of the internal structure of the casing of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the first and second positioning pins of this utility model;

[0021] Figure 5 This is a three-dimensional cross-sectional view of the connection between the input shaft and the bushing of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the stator shell and permanent magnet of this utility model;

[0023] Figure 7 This is a schematic diagram of the bolt hole and bolt three-dimensional structure of this utility model.

[0024] The diagram is marked as follows:

[0025] 1. Reducer; 2. Input shaft; 3. Bushing; 4. Rotor core; 5. Permanent magnet; 6. Front cover; 7. Housing; 8. Rear cover; 9. Stator housing; 10. Stator core; 11. Winding wire; 12. First positioning groove; 13. Corresponding groove; 14. First positioning pin; 15. Keyway hole; 16. Second positioning groove; 17. Second positioning pin; 18. Limit bolt post; 19. First arc-shaped part; 20. Second arc-shaped part; 21. Lifting ring; 22. Positioning block; 23. Positioning hole; 24. Positioning post; 25. Mounting flange; 26. Air gap; 27. Threaded hole; 28. Bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] like Figures 1 to 7 As shown, a permanent magnet motor suitable for oilfield pumping equipment includes a reducer 1. An input shaft 2 is fixedly connected to the input end of the reducer 1. A bushing 3 is fixedly connected to the outside of one end of the input shaft 2. A rotor core 4 is fixedly connected to the outer wall of the bushing 3. A plurality of equidistant and uniformly distributed permanent magnets 5 are fixedly connected to the outer wall of the rotor core 4. A mounting flange 25 is fixedly connected to the side wall of the reducer 1 near the outer wall of the input shaft 2. A front end cover 6 is fixedly connected to the side wall of the mounting flange 25. A housing 7 is provided on the side wall of the front end cover 6. A rear end cover 8 is provided on the side of the housing 7 away from the front end cover 6. A stator housing 9 is fixedly connected to the inner wall of the housing 7. A plurality of equidistant and uniformly distributed stator cores 10 are fixedly connected to the inner wall of the stator housing 9. A winding 11 is sleeved on the outer wall of the stator core 10. An air gap 26 is formed between the permanent magnets 5 and the stator cores 10. The air gap 26 formed between the permanent magnets 5 and the stator cores 10 is 2mm. A connecting mechanism is provided between the bushing 3 and the outer wall of the input shaft 2.

[0029] During operation, when the oil pumping equipment needs to be started, the permanent magnet motor is started. The electrical energy is first transmitted to the winding 11 inside the stator core 10. After the winding 11 is energized, a rotating magnetic field is formed inside the stator core 10. This rotating magnetic field passes through the air gap 26 and acts on multiple permanent magnets 5 fixed on the rotor core 4. Under the interaction of the magnetic fields, the permanent magnets 5 are driven by electromagnetic force to generate torque, thereby driving the rotor core 4 to rotate. The rotor core 4 drives the input shaft 2 to rotate synchronously through the bushing 3 fixedly connected to its outer wall. The input shaft 2 then transmits the power to the reducer 1. After reduction, a smooth low-speed high-torque power is output for the use of the oil pumping equipment. During the entire operation, the air gap 26 between the motor rotor and the stator is set to 2mm.

[0030] Compared to traditional designs, it has a larger spacing, which can effectively prevent the permanent magnet 5 from contacting and rubbing against the stator core 10 even if the rotor swings slightly or moves axially in the complex and vibrating environment of the oilfield well site, thus ensuring the stable operation of the equipment for a long time.

[0031] The stator core 10, winding 11, permanent magnet 5 and other components are all enclosed and installed inside the housing 7. They are precisely connected to the positioning block 22 and positioning hole 23 through the front cover 6, rear cover 8 and positioning column 24, ensuring the overall structure is stable and easy to disassemble and maintain. At the same time, the permanent magnet motor does not require a base or welding. It can be directly fixed to the oil pumping equipment with external bolts, which greatly reduces the risk of fire and the burden of safety management at the construction site.

[0032] Further, see attached document. Figure 2 and Figure 5 As shown, the connecting mechanism includes a first positioning groove 12 opened on the top of the inner wall of the bushing 3, a corresponding groove 13 opened at the end of the input shaft 2 near the bushing 3, a second positioning pin 14 fixedly connected to the inner wall of the corresponding groove 13, a keyway hole 15 opened on the outer wall of the bushing 3, one end of the outer wall of the keyway hole 15 communicating with the side wall of the bushing 3, a second positioning groove 16 opened on the inner wall of the rotor core 4, a first positioning pin 17 inserted between the opposite faces of the keyway hole 15 and the second positioning groove 16, a plurality of equally spaced and evenly distributed limiting bolt posts 18 threaded between the side wall of the bushing 3 and the side wall of the rotor core 4, the second positioning pin 14 between the inner walls of the corresponding groove 13 and the first positioning groove 12 are mutually adapted, the end of the second positioning pin 14 away from the reducer 1 is shaped as a first arc-shaped part 19, and the end of the first positioning pin 17 near the reducer 1 is shaped as a second arc-shaped part 20.

[0033] First, the bushing 3 is fitted onto one end of the input shaft 2, so that the first positioning groove 12 on the top of the inner wall of the bushing 3 is aligned with the corresponding groove 13 on the input shaft 2. The second positioning pin 14, which is fixed to the inner wall of the corresponding groove 13, is inserted into the first positioning groove 12 to achieve preliminary positioning and ensure axial connection stability. Then, the rotor core 4 is fitted onto the outer wall of the bushing 3. The first positioning pin 17 is hammered into the keyway hole 15 on the outer wall of the bushing 3, so that one end of it is embedded in the second positioning groove 16 on the inner wall of the rotor core 4, and the other end forms a positioning fit with the opposite surface of the keyway hole 15.

[0034] Next, the bushing 3 and the side wall of the rotor core 4 are connected by threads using multiple evenly distributed equidistant limiting bolts 18 to further enhance their circumferential fixing ability. Among them, the end of the second positioning pin 14 away from the reducer 1 is set as the first arc-shaped part 19, which facilitates alignment with the inner wall of the first positioning groove 12 during installation. The end of the first positioning pin 17 close to the reducer 1 is set as the second arc-shaped part 20, which makes the installation and insertion process smoother. The whole process ensures multiple positioning and stable installation in the axial, radial and circumferential directions, providing a reliable guarantee for the efficient transmission between the motor and the reducer.

[0035] Further, see attached document. Figure 3 As shown, a positioning block 22 is fixedly connected to the outer wall of the housing 7, and a positioning hole 23 is opened on the side wall of the positioning block 22. A positioning post 24 is fixedly connected to the side wall of the front cover 6, and one end of the positioning post 24 passes through the positioning hole 23.

[0036] The continuous rotation of the rotor core 4 exerts a reaction force in the opposite direction on the fixed front cover 6, rear cover 8, and housing 7. If the front cover 6 and rear cover 8 are only fixed to the housing 7 with bolts, the bolts may loosen after long-term operation, which will affect the overall stability and safety of the motor. By setting a positioning block 22 on the top of the housing 7 and opening a positioning hole 23, the positioning post 24 on the front cover 6 and rear cover 8 can be inserted into it, thus forming a multi-point rigid limiting structure. This can effectively counteract the shear stress impact of the counter torque generated by the rotation of the rotor core 4 on the bolts, enhance the anti-rotation performance of the structure, prevent the front cover 6, rear cover 8, and housing 7 from loosening, and improve the long-term operational reliability and structural safety of the equipment.

[0037] Further, see attached document. Figure 1 As shown, the top of the housing 7 is provided with two lifting rings 21 for lifting the housing 7, which facilitates the hoisting of the motor during construction or maintenance and avoids tilting or damage to the equipment caused by manual handling.

[0038] Further, see attached document. Figure 3 and Figure 7 As shown, the side wall of the mounting flange 25 is provided with a plurality of equally spaced threaded holes 27. Each of the plurality of equally spaced threaded holes 27 is threaded with a bolt 28. The bolts 28 pass through the threaded holes 27 and are threaded to the front end cover 6 and the reducer 1, respectively. One end of the bolt 28 is shaped as a conical surface. The inner wall of the threaded hole 27 and the outer wall of the bolt 28 are adapted to each other.

[0039] By setting a conical structure between the threaded section and the bolt head of bolt 28, bolt 28 can automatically align itself when the motor is installed and screwed into the threaded hole 27 on the mounting flange 25. One end of bolt 28 has an outer diameter of 22mm and transitions to the 22mm threaded hole 27 on the mounting flange 25 to avoid gaps and effectively improve connection accuracy. While tightening the connection, bolt 28 also acts as a positioning pin, enabling precise positioning between the front cover 6 and the mounting flange 25. This prevents structural loosening and displacement caused by axial torque during motor operation and improves the overall stability and reliability of the connection between the motor and the reducer 1.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0041] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A permanent magnet motor suitable for oilfield pumping equipment, comprising a reducer (1), characterized in that: The input end of the reducer (1) is fixedly connected to an input shaft (2), and a bushing (3) is fixedly connected to the outside of one end of the input shaft (2). A rotor core (4) is fixedly connected to the outer wall of the bushing (3), and a plurality of equidistant and uniformly distributed permanent magnets (5) are fixedly connected to the outer wall of the rotor core (4). A mounting flange (25) is fixedly connected to the side wall of the reducer (1) near the outer wall of the input shaft (2). A front end cover (6) is fixedly connected to the side wall of the mounting flange (25), and a housing (7) is provided on the side wall of the front end cover (6). 7) A rear end cover (8) is provided on the side away from the front end cover (6). A stator housing (9) is fixedly connected to the inner wall of the housing (7). A plurality of stator cores (10) are fixedly connected to the inner wall of the stator housing (9). A winding (11) is sleeved on the outer wall of the stator core (10). An air gap (26) is formed between the permanent magnet (5) and the stator core (10). The air gap (26) formed between the permanent magnet (5) and the stator core (10) is 2mm. A connecting mechanism is provided on the outer wall of the bushing (3) and the input shaft (2).

2. A permanent magnet motor suitable for oilfield pumping equipment according to claim 1, characterized in that, The connecting mechanism includes a first positioning groove (12) opened on the top of the inner wall of the bushing (3), a corresponding groove (13) opened at one end of the input shaft (2) near the bushing (3), a second positioning pin (14) fixedly connected to the inner wall of the corresponding groove (13), a keyway hole (15) opened on the outer wall of the bushing (3), one end of the outer wall of the keyway hole (15) communicating with the side wall of the bushing (3), a second positioning groove (16) opened on the inner wall of the rotor core (4), and a first positioning pin (17) inserted between the opposite surfaces of the keyway hole (15) and the second positioning groove (16).

3. A permanent magnet motor suitable for oilfield pumping equipment according to claim 2, characterized in that, The second positioning pin (14) between the inner wall of the corresponding groove (13) and the first positioning groove (12) are mutually adapted.

4. A permanent magnet motor suitable for oilfield pumping equipment according to claim 1, characterized in that, The side wall of the housing (7) is fixedly connected to a positioning block (22), and the side wall of the positioning block (22) is provided with a positioning hole (23). The side wall of the front cover (6) is fixedly connected to a positioning post (24), and one end of the two positioning posts (24) passes through the positioning hole (23).

5. A permanent magnet motor suitable for oilfield pumping equipment according to claim 2, characterized in that, Multiple equidistant and evenly distributed limiting bolt columns (18) are threaded between the side wall of the bushing (3) and the side wall of the rotor core (4).

6. A permanent magnet motor suitable for oilfield pumping equipment according to claim 2, characterized in that, The end of the second positioning slightly (14) that is further away from the reducer (1) is shaped as a first arc-shaped part (19), and the end of the first positioning slightly (17) that is closer to the reducer (1) is shaped as a second arc-shaped part (20).

7. A permanent magnet motor suitable for oilfield pumping equipment according to claim 1, characterized in that, The top of the housing (7) is provided with two lifting rings (21) for lifting the housing (7).

8. A permanent magnet motor suitable for oilfield pumping equipment according to claim 1, characterized in that, The mounting flange (25) has multiple equally spaced threaded holes (27) on its side wall. Each of the multiple equally spaced threaded holes (27) is threaded with a bolt (28). The bolts (28) pass through the threaded holes (27) and are threaded onto the front cover (6) and the reducer (1). One end of the bolt (28) is shaped as a conical surface. The inner wall of the threaded hole (27) and the outer wall of the bolt (28) are adapted to each other.

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