A reducer-integrated semi-direct drive permanent magnet motor device for oil pumping units

Abstract

The present invention relates to a semi-direct-drive permanent magnet motor device integrated with a reducer for an oil pumping unit, comprising a motor and a reducer, wherein an intermediate shaft transition cover plate and an input shaft transition cover plate are fixed on the reducer housing, the input shaft transition cover plate extends beyond the edge of the reducer housing, and the extending portion is fixed to the motor housing by bolts; a connecting plate extending beyond the edge of the motor housing is also fixed to the motor, the connecting plate and the intermediate shaft transition cover plate are also fixed by bolts, the input shaft of the reducer is movably connected to the rotor of the motor through a coupling, the coupling comprises a disc, a tapered bushing and a cylindrical flat key, the tapered bushing is connected to the input shaft of the reducer by a key, the cylindrical flat key is slidably arranged on the outside of the tapered bushing, and the disc sleeve is arranged on the outside of the tapered bushing. The present invention enables the motor to be installed conveniently, stably and firmly, and the movable connection through the coupling ensures the transmission of torque and can adapt to the working conditions of axial stringing of the reducer input shaft and bending and deformation of the shaft head of the input shaft.

Description

Technical Field

[0001] The present invention belongs to the field of petroleum lifting machinery, and in particular relates to a speed reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit. Background Art

[0002] Currently, the most common type of oilfield pumping equipment is the walking beam pump, which has been used worldwide for over a century. Although this structure is durable and sturdy, with the main components of the drive structure being a conventional motor + pulley reduction + reducer reduction, and the final output to the crankshaft, it also has the following disadvantages: low transmission efficiency, easy belt breakage and slippage, the reducer input shaft is prone to bending due to improper installation, and the pulley transmission element is an exposed rotating part, resulting in poor safety. In recent years, the more energy-efficient and safer semi-direct drive walking beam pump has emerged. It removes the conventional motor + pulley reduction mechanism and replaces it with a permanent magnet motor. However, some problems have also arisen. Although the pulley problem of the previous structure has been solved, there are some problems with the installation process of the permanent magnet motor and the reducer input shaft, as well as the torque transmission process during operation. A semi-direct drive device with a new process structure is urgently needed.

[0003] While current semi-direct-drive motors offer many advantages, securing these circular motors to pumping units while ensuring torque transmission remains a common challenge. Previously, the reducer's input shaft was mounted on a pulley, eliminating the need for precise coaxiality between the pulley shaft and the reducer input shaft. This coaxiality issue was naturally addressed by the belt. However, with circular motors now mounted directly to the reducer's input shaft, ensuring coaxiality is crucial. Furthermore, existing commercially available machines typically utilize on-site hot work, where a mounting base for the circular motor is welded onto the existing reducer base and then secured. This poses a safety hazard due to the potential presence of natural gas near the pumping unit. Furthermore, the welded base, unheated, can significantly deform over time, leading to poor coaxiality between the motor shaft and the reducer input shaft. Finally, welded bases are difficult to precisely control, requiring extensive post-installation adjustments for height and angle to ensure proper coaxiality between the motor shaft and the reducer input shaft. This increases installation costs and places higher demands on the installer's skills. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a semi-direct drive permanent magnet motor device integrated with a reducer for an oil pumping unit. The motor and reducer in the device are easy to install, have a firm structure, and can meet the coaxiality accuracy requirements of the motor and reducer.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] The transmission mechanism that this invention relates to is that this transmission mechanism is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that the transmission mechanism of this invention is that

[0007] As a preferred solution: the upper and lower parts of the connecting plate are respectively fixed with an upper reinforcement mounting seat and a lower reinforcement mounting seat, and the reducer housing is also provided with an output shaft protrusion, and the upper and lower reinforcement mounting seat are respectively fixed to the upper and lower surfaces of the output shaft protrusion by bolts.

[0008] As a preferred solution: the upper reinforcement mounting seat and the lower reinforcement mounting seat are both composed of two plates welded perpendicularly to each other.

[0009] As a preferred solution: the coupling includes a disc, a tapered sleeve and a cylindrical flat key, the tapered sleeve is connected to the input shaft of the reducer through a key, the cylindrical flat key is slidably arranged on the outside of the tapered sleeve, the disc is sleeved on the outside of the tapered sleeve, and the disc is fixed to the rotor, an inner groove is provided on the inner wall of the disc, and the cylindrical flat key is arranged in the inner groove of the disc.

[0010] As a preferred solution: the depth of the inner groove of the disc is greater than the height of the cylindrical flat key protruding from the outer wall of the tapered sleeve.

[0011] As a preferred solution: there are multiple cylindrical flat keys, which are evenly spaced along the outer circumference of the tapered sleeve, and the number and position of the inner grooves of the disc match the number and position of the cylindrical flat keys.

[0012] As a preferred solution: the outer wall of the tapered sleeve is provided with an external keyway for installing a cylindrical flat key, and the inner hole of the tapered sleeve is a tapered hole for matching the taper of the input shaft of different reducers.

[0013] As a preferred solution: a positioning sleeve is further sleeved on the input shaft of the reducer, and the positioning sleeve is fixed to the housing of the reducer. An annular step surface is also provided on the middle of the back side of the motor, and the end of the positioning sleeve abuts against the annular step surface.

[0014] As a preferred solution: a sealing ring is provided between the positioning sleeve and the input shaft transition cover plate, and a skeleton oil seal is provided between the positioning sleeve and the input shaft of the reducer.

[0015] As a preferred solution, a crank is fixed to the output shaft of the reducer, and a photoelectric sensor for detecting the crank's operating angle is also fixed to the motor via a bracket. The addition of a photoelectric sensor mounted on the motor detects the crank's rotational position to determine the height of the sucker rod, thereby enabling accurate intelligent operation.

[0016] As a preferred solution: the motor is in the shape of a flat disc, and a motor front cover and a motor rear cover are respectively provided at the front and rear of the motor, and a coupling cover is also provided on the motor front cover at the input shaft of the reducer.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention utilizes an intermediate shaft transition cover plate and an input shaft transition cover plate, so that the motor can be conveniently, stably and firmly installed on site by means of bolts without ignition. The motor and the reducer input shaft are movably connected via a coupling, which not only ensures the transmission of torque but also can adapt to the working conditions of axial stringing of the reducer input shaft and bending deformation of the input shaft head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the fixed structure of the motor and reducer of the present invention (front and side view);

[0022] Figure 3 Schematic diagram of the fixing structure of the motor and reducer of the present invention (back side);

[0023] Figure 4 Schematic diagram of the cross-sectional structure of the connection between the motor and the reducer of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the reducer of the present invention;

[0025] Figure 6 It is a schematic diagram of the fixing structure of the motor, the intermediate shaft transition cover plate, and the input shaft transition cover plate of the present invention;

[0026] Figure 7 This is a schematic structural diagram of the front side of the motor of the present invention;

[0027] Figure 8 Schematic diagram of the overall structure of the coupling of the present invention;

[0028] Figure 9 It is a front structural schematic diagram of the coupling of the present invention;

[0029] Figure 10 It is a side structural schematic diagram of the coupling of the present invention;

[0030] Figure 11 It is a structural schematic diagram of the tapered sleeve and cylindrical flat key of the present invention;

[0031] Figure 12 It is a schematic diagram of the side structure of the tapered sleeve and the cylindrical flat key of the present invention;

[0032] Figure 13 It is a schematic diagram of the end face structure of the tapered shaft sleeve and the cylindrical flat key of the present invention.

[0033] The accompanying drawings are marked as follows: 1. Motor; 11. Upper reinforced mounting seat; 12. Lower reinforced mounting seat; 13. Lifting ring; 14. Junction box; 15. Bracket; 16. Photoelectric sensor; 17. Motor front cover; 18. Coupling cover; 19. Motor rear cover; 110. Motor stator; 111. Motor rotor; 2. Reducer; 21. Input shaft transition cover; 22. Intermediate shaft transition cover; 23. Output shaft boss; 24. Output shaft; 25. Positioning sleeve; 26. Input shaft; 31. Disc; 32. Tapered sleeve; 33. Disc inner groove; 34. Cylindrical flat key; 35. Inner keyway; 36. Outer keyway; 4. Crank. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0041] like Figures 1 to 5As shown, a semi-direct drive permanent magnet motor device with an integrated reducer for an oil pumping unit includes a motor 1 and a reducer 2, wherein the reducer 2 is provided with an input shaft 26, an intermediate shaft and an output shaft 24, and the motor 1 is provided with a stator 110 and a rotor 111. An intermediate shaft transition cover plate 22 and an input shaft transition cover plate 21 are fixed to the housing of the reducer 2, and the input shaft transition cover plate 21 extends beyond the edge of the reducer 2 housing, and the extending portion is fixed to the housing of the motor 1 by bolts; a connecting plate extending beyond the edge of the motor 1 housing is also fixed to the motor 1, and the connecting plate is also fixed to the intermediate shaft transition cover plate 22 by bolts, and the input shaft 26 of the reducer 2 is movably connected to the rotor 111 of the motor 1 through a coupling.

[0042] The input shaft transition cover plate 21 consists of an integrally formed square plate and a trapezoidal plate. One side of the square plate shares a common base with the upper base of the trapezoidal plate. The trapezoidal plate extends beyond the upper and lower sides of the square plate, located outside the reducer, and is bolted to the motor. The square plate is bolted to the reducer 2 and has a central through-hole. The intermediate shaft transition cover plate 22 consists of a regular octagonal connecting plate and two triangular connecting ears extending from two sides of the connecting plate. The upper and lower connecting ears are bolted to the connecting plate of the motor. The connecting plate is also bolted to the reducer.

[0043] The intermediate shaft transition cover 22 and input shaft transition cover 21 of the reducer use non-standard transition pressure cover plates. This plate is processed with different sizes of input shaft and intermediate shaft bearing pressure cover fixing holes for different reducers to fix the non-standard transition pressure cover plates on the reducer housing. At the same time, the input shaft transition cover 21 has through holes for screws to fix relative to the back of the motor end cover, and the intermediate shaft transition cover 22 has threaded holes for screws to fix relative to the front of the motor end cover.

[0044] The upper and lower portions of the connecting plate are secured with an upper reinforcement mount 11 and a lower reinforcement mount 12, respectively. Each of these mounts is composed of two plates welded perpendicularly to each other. The reducer 2 housing is also provided with an output shaft projection 23, with the upper and lower reinforcement mounts 11 and 12 secured to the upper and lower surfaces of this projection 23 via bolts. This structure utilizes the same screws used to secure the upper cover and base of conventional pumping unit reducers, securing the upper and lower reinforcement mounts 11 and 12. This ensures both the horizontal and vertical screw fixation of the motor and reducer, further enhancing the motor's securement and ensuring long-term reliability.

[0045] like Figure 6 and Figure 7As shown, the motor 1 is in the shape of a flat disc, and is provided with a front motor cover 17 and a rear motor cover 19 at the front and rear of the motor 1, respectively. A coupling cover 18 is also provided on the front motor cover 17 at the input shaft 26 of the reducer 2. The crank 4 is fixed to the output shaft 24 of the reducer 2, and a photoelectric sensor 16 for detecting the operating angle of the crank 4 is also fixed to the motor 1 via a bracket 15.

[0046] The motor 1 adopts a permanent magnet disc motor and is equipped with a frequency converter drive. The frequency converter and the photoelectric sensor 16 can realize an intelligent oil production process, that is, changing the up and down running speed of the sucker rod to achieve a fast pumping and slow release effect to improve the pump efficiency and reduce the pump leakage rate. The photoelectric sensor 16 added to the motor is used as a calibration for each operation process.

[0047] The side of the motor 1 is also provided with a lifting ring 13 and a terminal box 14. The terminal box is arranged on the side to facilitate operations such as wiring and maintenance; and the setting of the lifting ring makes it more convenient to lift the motor.

[0048] like Figures 8 to 13 As shown, the coupling includes a disc 31, a tapered sleeve 32, and a cylindrical key 34. The tapered sleeve 32 is connected to the input shaft 26 of the reducer 2 via a key. The cylindrical key 34 is slidably arranged on the outside of the tapered sleeve 32. The disc 31 is sleeved on the outside of the tapered sleeve 32, and the disc 3 is fixed to the rotor 111. The inner wall of the disc 3 is provided with a disc inner groove 33, and the cylindrical key 34 is arranged in the disc inner groove 33. The bottom direction of the cylindrical key can move back and forth on the sleeve, and the cylindrical outer surface of the cylindrical key can rotate in the keyway groove of the disc, so that a small range of axial play and bending of the reducer input shaft can be allowed.

[0049] The depth of the disc's inner groove 33 is greater than the height of the cylindrical key 34 protruding from the outer wall of the tapered sleeve 32. A clearance of 6 mm is provided between the cylindrical key 34 and the inner wall of the disc's inner groove 33. This reserved clearance is sufficient to correct for any deviation in the input shaft. Furthermore, the axial sliding of the cylindrical key and the circumferential rotation of the tapered sleeve resolve coupling drive issues caused by input shaft bending.

[0050] There are multiple cylindrical flat keys 34 , which are evenly spaced along the outer circumference of the tapered sleeve 32 . The number and position of the inner grooves 33 of the disc match the number and position of the cylindrical flat keys 34 .

[0051] The outer wall of the tapered sleeve 32 is provided with an external keyway 36 for receiving a cylindrical flat key 34. The inner hole of the tapered sleeve 32 is a tapered hole designed to match the taper of the input shaft 26 of different reducers 2. The inner wall of the tapered hole is also provided with an internal keyway 35. The input shaft 26 of the reducer 2 also has a transmission keyway. The flat key is positioned within the accommodation space formed by the internal keyway 35 and the transmission keyway, enabling torque transmission between the tapered sleeve 32 and the input shaft 26.

[0052] A positioning sleeve 25 is also mounted on the input shaft 26 of the reducer 2. The positioning sleeve 25 is fixed to the housing of the reducer 2. An annular step surface is also provided in the middle of the back of the motor 1, with the end of the positioning sleeve 25 abutting against the annular step surface. A sealing ring is provided between the positioning sleeve 25 and the input shaft transition cover 21, and a skeleton oil seal is provided between the positioning sleeve 25 and the input shaft 26 of the reducer 2.

[0053] The positioning sleeve added in this application has an outer diameter at one end that matches the input shaft hole of the reducer, and an outer diameter at the other end that matches the inner hole of the rear end cover shaft of the motor, so that the coaxiality of the reducer input shaft and the motor shaft is ensured.

[0054] The motor rear cover 19 in the present application is an integrated structure of the end cover and the shaft. The rotor is rotatably connected to the shaft of the motor rear cover 19 through a bearing. The integrated structure of the end cover and the shaft can ensure that the coaxiality transmitted by the positioning sleeve can be transferred to the motor rotor with the maximum accuracy, thereby reducing the coaxiality error between the motor rotor and the reducer input shaft to a minimum. At the same time, the flatness of the end face of the reducer input shaft transition cover 21 is used to ensure the verticality requirement between the motor rear cover 19 and the reducer input shaft.

[0055] The semi-direct drive motor in this application is directly installed on site without any damage from the delivery status, without any hot work. The specific installation steps are as follows:

[0056] 1. First remove the original bearing glands of the reducer's input shaft and intermediate shaft;

[0057] 2. Install the positioning sleeve into the shaft hole of the input shaft (used to position the input shaft transition cover 21 and the coaxiality of the motor rear cover 19);

[0058] 3. Install the intermediate shaft transition cover 22 and the input shaft transition cover 21 in place (using the fixing screw holes and end faces of the original reducer bearing gland);

[0059] 4. Use the lifting ring to hoist the motor, slowly align the inner hole of the motor rear cover 19 with the positioning sleeve, and use screws to fix the reducer and the motor from the front and back of the motor respectively.

[0060] 5. Fix the horizontal base plates of the upper and lower reinforcement mounting seats 11 and 12 to the output shaft protrusion 23 of the reducer with screws, and fix the vertical plates of the upper and lower reinforcement mounting seats 11 and 12 to the motor rear cover 19.

[0061] 6. Adjust the front and rear position of the photoelectric sensor 16 on the motor so that it can just sense the crank of the pumping unit without interfering with the rotation of the crank.

[0062] In summary, the present application has the following obvious advantages: 1. The change in the motor fixing method enables non-destructive installation on site without the need for hot work. 2. The coaxiality of the motor installation can be quickly positioned and installed by relying on the pre-processed positioning sleeve, without the need for long-term adjustment of the motor height and angle, which reduces the requirements for the installer and facilitates quick assembly and disassembly. 3. Using the diameter and end face of the bearing hole of the reducer input shaft and the intermediate shaft, the new intermediate shaft transition cover 22 and input shaft transition cover 21 are reinstalled to fix the motor, and the upper and lower reinforcement mounting seats are added to fix the motor together to ensure sufficient installation strength. 4. The new disc sleeve coupling is used to transmit torque, which can meet the axial stringing of the reducer input shaft and the bending of the shaft head; 5. A photoelectric sensor is added to detect the crank operating angle to calibrate the actual height of the sucker rod to display intelligent oil production.

[0063] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0064] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A semi-direct drive permanent magnet motor device integrated with a reducer for an oil pumping unit, comprising a motor (1) and a reducer (2), wherein the reducer (2) is provided with an input shaft (26), an intermediate shaft, and an output shaft (24), and the motor (1) is provided with a stator (110) and a rotor (111), characterized in that: The reducer (2) housing is fixed with an intermediate shaft transition cover (22) and an input shaft transition cover (21), the input shaft transition cover (21) exceeds the edge of the reducer (2) housing, and the exceeding portion is fixed to the housing of the motor (1) by bolts; the motor (1) is also fixed with a connecting plate that exceeds the edge of the motor (1) housing, the connecting plate and the intermediate shaft transition cover (22) are also fixed by bolts, and the input shaft (26) of the reducer (2) is movable with the rotor (111) of the motor (1) through a coupling. The coupling comprises a disc (31), a tapered sleeve (32) and a cylindrical flat key (34), the tapered sleeve (32) and the input shaft (26) of the reducer (2) are connected via a key, the cylindrical flat key (34) is slidably arranged on the outside of the tapered sleeve (32), the disc (31) is sleeved on the outside of the tapered sleeve (32), and the disc (31) is fixed to the rotor (111), an inner disc groove (33) is provided on the inner wall of the disc (31), and the cylindrical flat key (34) is arranged in the inner disc groove (33); An upper reinforcement mounting seat (11) and a lower reinforcement mounting seat (12) are fixed to the upper and lower parts of the connecting plate, respectively. An output shaft protrusion (23) is also provided on the housing of the reducer (2). The upper reinforcement mounting seat (11) and the lower reinforcement mounting seat (12) are fixed to the upper and lower surfaces of the output shaft protrusion (23) by bolts, respectively. The upper reinforcement mounting seat (11) and the lower reinforcement mounting seat (12) are both composed of two plates welded perpendicularly to each other.

2. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: The depth of the inner groove (33) of the disc is greater than the height of the cylindrical flat key (34) protruding from the outer wall of the tapered sleeve (32).

3. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: There are multiple cylindrical flat keys (34) that are equidistantly spaced along the outer circumferential surface of the tapered sleeve (32), and the number and position of the disc inner grooves (33) match the number and position of the cylindrical flat keys (34).

4. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: The outer wall of the tapered sleeve (32) is provided with an outer keyway (36) for mounting a cylindrical flat key (34), and the inner hole of the tapered sleeve (32) is a tapered hole for matching the taper of the input shaft (26) of different reducers (2).

5. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: A positioning sleeve (25) is also sleeved on the input shaft (26) of the reducer (2), and the positioning sleeve (25) is fixed to the housing of the reducer (2). An annular step surface is also provided on the middle of the back side of the motor (1), and the end of the positioning sleeve (25) abuts against the annular step surface.

6. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 5, characterized in that: A sealing ring is provided between the positioning sleeve (25) and the input shaft transition cover (21), and a skeleton oil seal is provided between the positioning sleeve (25) and the input shaft (26) of the reducer (2).

7. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: The output shaft (24) of the reducer (2) is fixed with a crank (4), and a photoelectric sensor (16) for detecting the operating angle of the crank (4) is also fixed to the motor (1) via a bracket (15).

8. The reducer-integrated semi-direct drive permanent magnet motor device for an oil pumping unit according to claim 1, characterized in that: The motor (1) is in the shape of a flat disc, and a motor front cover (17) and a motor rear cover (19) are provided at the front and rear of the motor (1), respectively. A coupling cover (18) is also provided on the motor front cover (17) at the input shaft (26) of the reducer (2).

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