Motor capable of automatically aligning and axially moving and mounting structure of motor and speed reducer

Abstract

The utility model relates to a self-aligning axially-moving motor and a mounting structure of the motor and a decelerator, the motor comprises a housing, a stator and a rotor, the stator is fixed in the housing, the rotor is arranged in the stator, the rotor and the housing are rotatably connected through a bearing A, a self-aligning soft sleeve is arranged between the bearing A and the housing, and the self-aligning soft sleeve is sleeved on the housing. The rotor is further provided with a shaft taper sleeve used for being in transmission connection with the input shaft of the speed reducer, and the shaft taper sleeve is in clearance fit with the rotor and / or the input shaft of the speed reducer and is in transmission through a key groove structure. According to the utility model, the self-aligning soft sleeve is arranged, when the speed reducer bearing and the motor bearing are over-positioned, the self-aligning soft sleeve is extruded and deformed, so that the stable and high-precision coaxiality of the motor rotor and the speed reducer input shaft is ensured, the service life of the motor is greatly prolonged, and the conical shaft sleeve is in clearance fit with the rotor and / or the speed reducer input shaft; the axial movement between the input shaft of the speed reducer and the rotor can be realized, the motor rotor is protected from interference with other parts, and the performance of the motor can be prevented from being reduced.

Description

Technical Field

[0001] This utility model belongs to the field of oil lifting machinery technology, and in particular relates to a multi-bearing over-positioning automatic self-aligning axially driven motor. Background Technology

[0002] Currently, the semi-direct drive retrofit of nodding donkey machines has been widely applied. The flat permanent magnet motor is directly fixed on the input shaft of the reducer. There are two common motor structures: one is that the motor is equipped with bearings for easy, safe and quick fixing and disassembly; the other is that no bearings are installed between the motor stator and rotor. The stator and rotor are shipped separately. During on-site installation, the motor stator is fixed to the outer end face of the input bearing chamber of the reducer, and the motor rotor is fixed separately on the input shaft of the reducer.

[0003] There are two existing semi-direct drive structures, each with its own advantages and disadvantages. The first type, with a bearing motor, is convenient for on-site installation. The high overlap of the motor stator and rotor prevents the motor performance degradation caused by the rotor's movement due to the input shaft of the reducer. It also avoids interference between the motor rotor and other parts. However, due to the over-alignment problem between the motor bearing and the two bearings on the input shaft of the reducer, and because the reducer bearing is much larger than the motor bearing, the motor bearing will be damaged due to the over-alignment problem after a short period of operation, affecting production or even causing the motor to burn out.

[0004] While the second design eliminates the bearing, thus avoiding bearing over-alignment issues, it introduces other problems. For instance, the separate stator and rotor design makes the motor components susceptible to damage during transportation and disassembly due to the motor's production, testing, and on-site installation and disassembly. Additionally, the presence of magnets on the rotor makes it easy for metal parts to enter and damage the motor during assembly and disassembly. Furthermore, when the reducer input shaft vibrates, the motor rotor also vibrates synchronously, potentially causing interference between the motor rotor and other parts. The reduced overlap between the motor rotor and stator also affects motor performance, effectively lowering motor power. In high-load environments, prolonged overload operation can shorten the motor's lifespan or even burn out the stator. Utility Model Content

[0005] To solve the above-mentioned technical problems, the first objective of this utility model is to provide an automatically self-aligning axially movable motor with stable structure, good performance, and long service life; the second objective of this utility model is to provide an installation structure for the motor and the reducer.

[0006] To achieve the first objective of the above-mentioned utility model, the present utility model adopts the following technical solution:

[0007] The self-aligning axially movable motor includes a housing, a stator, and a rotor. The stator is fixed inside the housing, and the rotor is disposed inside the stator. The rotor and the housing are rotatably connected by a bearing A. A self-aligning soft sleeve is also provided between the bearing A and the housing. The rotor is also provided with a tapered sleeve for transmission connection with the input shaft of a reducer. The tapered sleeve has a clearance fit with the rotor and / or the input shaft of the reducer and is transmitted through a keyway structure.

[0008] As a preferred embodiment: the housing includes a casing and an end cover that are fixed to each other. The end cover is provided with a bearing chamber. The bearing A is embedded in the bearing chamber, and a limiting cover plate A is fixed to the end face of the bearing chamber. A limiting cover plate B is provided on the end face of the rotor. The limiting cover plate A and the limiting cover plate B press against the two ends of the bearing A respectively, so that the bearing A does not move axially.

[0009] As a preferred embodiment: the tapered bushing has a tapered hole, the input shaft of the reducer is inserted into the tapered hole, and it is interference-fitted with the tapered bushing for transmission.

[0010] As a preferred embodiment: the tapered bushing is provided with a tapered hole, and the side wall of the tapered hole is also provided with an inner keyway. The reducer input shaft is inserted into the tapered hole, and the reducer input shaft is provided with spline A. The reducer input shaft and the tapered bushing are connected by the cooperation of spline A and the inner keyway.

[0011] As a preferred embodiment: the tapered bushing is cylindrical in shape, and an external keyway is provided on the outer side of the tapered bushing. The tapered bushing is embedded in the rotor, and a spline B is provided on the rotor. The rotor and the tapered bushing are driven by the cooperation of the external keyway and the spline B.

[0012] As a preferred embodiment, the thickness of the self-aligning sleeve is less than the gap between the stator and the rotor.

[0013] As a preferred embodiment: at least one of the two sides of the rotor along the axial direction is provided with a convex ring, and the housing is provided with a position sensor for measuring the position change of the convex ring during rotation.

[0014] As a preferred embodiment, there are multiple position sensors, and the centers of the multiple position sensors coincide with the center A of the stator.

[0015] As a preferred embodiment: a flat disc encoder is fixed on the housing, and an encoder code disk that cooperates with the flat disc encoder is provided on the rotor.

[0016] To achieve the second objective of the above-mentioned utility model, the present utility model adopts the following technical solution:

[0017] A motor and reducer mounting structure includes a motor and a reducer fixed on a mounting bracket. The input shaft of the reducer is rotatably connected to the mounting bracket via a bearing B. The motor is an auto-aligning axially movable motor as described in any of the above descriptions.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model features a bearing between the motor rotor and the housing, making motor production and on-site installation convenient and quick. Simultaneously, a self-aligning sleeve is installed between the rotor and the housing. When over-alignment occurs between the reducer bearing and the motor bearing, the self-aligning sleeve undergoes compression deformation, ensuring a stable and high-precision coaxial alignment between the motor rotor and the reducer input shaft. This protects the motor bearing from strain and significantly extends the motor's lifespan, allowing the motor bearing to operate under normal loads and, with routine maintenance, meet actual usage requirements.

[0020] The tapered bushing of this invention has a clearance fit with the rotor and / or the input shaft of the reducer, which allows for axial movement between the input shaft of the reducer and the rotor. This axial movement will not cause the motor rotor to move axially, thus protecting the motor rotor from interference with other parts. In addition, it can also prevent the motor performance from deteriorating due to axial misalignment of the stator and rotor. Attached Figure Description

[0021] The accompanying drawings, which form 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 thereof.

[0022] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the tapered bushing of this utility model.

[0024] The attached figures are labeled as follows: 11. Housing; 12. End cover; 121. Limiting cover plate A; 122. Limiting cover plate B; 2. Stator; 3. Rotor; 30. Bearing A; 31. Self-aligning soft sleeve; 32. Convex ring; 4. Tapered shaft sleeve; 40. Fit clearance; 41. Tapered hole; 42. Inner keyway; 43. Outer keyway; 5. Reducer input shaft; 51. Bearing B; 6. Controller box; 61. Encoder cable; 62. Position sensor cable; 7. Position sensor; 81. Encoder code disk; 82. Flat disc encoder; 9. Mounting bracket. Detailed Implementation

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] like Figure 1 and Figure 2 As shown, a multi-bearing over-positioning self-aligning axially movable motor includes a housing, a stator 2, and a rotor 3. The stator 2 is fixed inside the housing, and the rotor 3 is disposed inside the stator 2. The rotor 3 and the housing are rotatably connected by a bearing A30. The housing includes a casing 11 and an end cover 12 that are fixed to each other. A bearing chamber is provided inside the end cover 12. The bearing A30 is embedded in the bearing chamber, and a limiting cover plate A121 is fixed to the end face of the bearing chamber. A limiting cover plate B122 is provided on the end face of the rotor 3. The limiting cover plate A121 and the limiting cover plate B122 respectively press against the two ends of the bearing A30, so that the bearing A30 does not move axially.

[0033] The motor is equipped with bearings. By using a limiting cover plate and screws to limit the bearings and the motor rotor, the axial movement of the motor stator and rotor is restricted, preventing the rotor from moving in the bearings within the motor. This greatly facilitates motor production, testing, and on-site installation, and also protects the motor from damage caused by friction and impact during transportation due to the absence of bearings.

[0034] After the motor of this utility model is equipped with a bearing, and the bearing of the reducer is also installed, due to machining errors and installation errors, the bearing will be over-aligned. This will inevitably lead to the rapid damage of the weak bearing after a period of operation, which will seriously affect the operation of the equipment. Therefore, a self-aligning soft sleeve 31 is provided between the bearing A30 of the motor and the housing. The self-aligning soft sleeve 31 is fitted on the outer ring of the bearing A30, and the outer wall is interference-fitted with the inner wall of the bearing housing. The material of the self-aligning soft sleeve 31 is a relatively soft metal ring such as aluminum or copper. The thickness of the self-aligning soft sleeve 31 is less than the gap X between the stator 2 and the rotor 3. The common value of X is 2mm.

[0035] The material and thickness of the self-aligning sleeve 31 are precisely designed and tested to determine its specifications and dimensions. This ensures that after the motor is installed and running, because the bearing model of the reducer is much larger than that of the motor bearing, over-alignment will occur. As a result, the self-aligning sleeve 31 will be squeezed by the input shaft of the reducer, making the motor rotor and the input shaft of the reducer form a stable and high-precision coaxial shape. This protects the motor bearing from being strained and greatly improves the motor's lifespan, allowing the motor bearing to operate under normal loads. With regular maintenance, the lifespan meets the actual usage requirements.

[0036] The rotor 3 is also provided with a tapered sleeve 4 for transmission connection with the input shaft 5 of the reducer. The tapered sleeve 4 is clearance-fitted with the rotor 3 and / or the input shaft 5 of the reducer, and is transmitted through a keyway structure.

[0037] The tapered bushing 4 has a tapered hole 41 inside, and the reducer input shaft 5 is inserted into the tapered hole 41 and is interference-fitted with the tapered bushing 4 for transmission. To further ensure the stability of power transmission, an inner keyway 42 is also provided on the side wall of the tapered hole 41. The reducer input shaft 5 is inserted into the tapered hole 41 and has a spline A on it. The reducer input shaft 5 and the tapered bushing 4 are transmitted through the cooperation of the spline A and the inner keyway 42.

[0038] The tapered bushing 4 is cylindrical in shape, and an external keyway 43 is provided on the outer side of the tapered bushing 4. The tapered bushing 4 is embedded in the rotor 3, and a spline B is provided on the rotor 3. The rotor 3 and the tapered bushing 4 are driven by the cooperation of the external keyway 43 and the spline B. A fitting gap 40 is formed between the tapered bushing 4 and the inner hole of the motor rotor.

[0039] This invention relates to a method for transitional installation between the motor rotor and the reducer input shaft via a tapered bushing. The inner bore of this tapered bushing is a tapered hole that matches the original reducer input shaft size, while the outer ring is a straight shaft design that provides a clearance fit with the inner bore of the motor rotor and allows axial movement within the rotor's inner bore. This tapered bushing has an axial through-cut for tensioning and securing the motor shaft and reducer input shaft. The inner tapered hole and outer straight shaft of the tapered bushing effectively fix the reducer input shaft while preventing any movement of the reducer input shaft from affecting the axial dimensions of the motor rotor. This ensures safe, stable, and high-performance motor operation even when the reducer input shaft moves erratically, a common issue in field operations.

[0040] A flat disc encoder 82 (encoder chip) is fixed on the housing and is fixed to the limiting cover plate A121. The rotor 3 is provided with an encoder code disk 81 that cooperates with the flat disc encoder 82. Because the motor is equipped with bearings, it ensures that there is no axial movement after the rotor and stator are installed, ensuring effective encoder sensing. An encoder is installed inside the motor, enabling the motor to stop at "0" speed. This facilitates alignment with the suspension device during on-site installation and can also be used to calibrate leaks in metering equipment pipelines.

[0041] The rotor 3 of this invention has a raised ring 32 on at least one of its two axial sides. The housing is provided with a position sensor 7 for measuring the position change of the raised ring 32 during rotation. There are at least three position sensors 7, and the centers of the three position sensors 7 coincide with the center A of the stator 2.

[0042] A controller box 6 is also provided on one side of the housing, and a controller is installed inside the controller box 6. The flat disc encoder 82 and the position sensor 7 are connected to the controller through encoder line 61 and position sensor line 62, respectively. The controller calculates the rotation center B of the rotor 3 based on the detection information of multiple position sensors 7. When the position difference between the center B and the center A is greater than or equal to the gap between the stator 2 and the rotor 3, the controller controls the motor to stop and generates an alarm message. The user can promptly detect and handle the problem, while effectively protecting the motor from damage. The above-mentioned controller's calculation of rotor eccentricity using position sensors and its closed-loop control of the motor using encoders are existing motor control technologies and will not be elaborated further here.

[0043] A motor and reducer mounting structure includes a motor and a reducer fixed on a mounting bracket 9. The input shaft 5 of the reducer is rotatably connected to the mounting bracket 9 via a bearing B51. The motor is a multi-bearing, self-aligning, axially movable motor as described in any of the above descriptions.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit 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 shall still fall within the scope of the technical solution of the present invention.

Claims

1. An automatic alignment axial displacement motor comprising a housing, a stator (2) and a rotor (3), said stator (2) being fixed in the housing, said rotor (3) being arranged in the stator (2) and being rotatably connected to the housing by means of a bearing A (30), characterized in that: The bearing A (30) is further provided with a self-aligning sleeve (31) between the bearing A (30) and the shell, and the rotor (3) is further provided with a shaft taper sleeve (4) for transmission connection with the reducer input shaft (5), the shaft taper sleeve (4) is matched with the rotor (3) and / or the reducer input shaft (5) with a gap, and is driven by the structure of the key groove.

2. The automatically aligned axial-float motor of claim 1, wherein: The shell includes a casing (11) and an end cover (12) fixed to each other, the end cover (12) is provided with a bearing chamber, the bearing A (30) is embedded in the bearing chamber, and the end face of the bearing chamber is fixedly provided with a limiting cover plate A (121), the end face of the rotor (3) is provided with a limiting cover plate B (122), and the limiting cover plate A (121) and the limiting cover plate B (122) are respectively pressed on both ends of the bearing A (30), so that the bearing A (30) has no axial movement.

3. The self-aligning axial-play electric motor according to claim 1, characterized in that: The taper sleeve (4) is provided with a tapered hole (41) therein, and the reducer input shaft (5) is inserted into the tapered hole (41) and is in interference fit transmission with the taper sleeve (4).

4. The self-aligning axial-play electric motor according to claim 1, characterized in that: The taper sleeve (4) is provided with a tapered hole (41) therein, and the taper sleeve (4) is provided with an inner key groove (42) on the side wall of the tapered hole (41), the reducer input shaft (5) is inserted into the tapered hole (41), the reducer input shaft (5) is provided with a spline A, and the reducer input shaft (5) is in transmission with the taper sleeve (4) through the cooperation of the spline A and the inner key groove (42).

5. The self-aligning axial-play electric motor according to claim 1, characterized in that: The taper sleeve (4) is in a cylindrical shape as a whole, and the taper sleeve (4) is further provided with an outer key groove (43) on the outside, the taper sleeve (4) is embedded in the rotor (3), the rotor (3) is further provided with a spline B, and the rotor (3) is in transmission with the taper sleeve (4) through the cooperation of the outer key groove (43) and the spline B.

6. The automatically aligned axial-float motor of claim 1, wherein: The thickness of the self-aligning sleeve (31) is less than the gap between the stator (2) and the rotor (3).

7. The self-aligning axial-play electric motor according to claim 1, characterized in that: At least one of the two side faces of the rotor (3) in the axial direction is provided with a ring of convex rings (32), and the shell is provided with a position sensor (7) for measuring the position change amount of the convex ring (32) during rotation.

8. The automatically aligned axial-float motor of claim 6, wherein: The position sensor (7) is a plurality of position sensors (7), and the centers of the plurality of position sensors (7) coincide with the center A of the stator (2).

9. The automatic aligning axially-floatable electric motor according to claim 1, characterized in that: The shell is fixed with a flat disc encoder (82), and the rotor (3) is provided with an encoder disc (81) matched with the flat disc encoder (82).

10. An installation structure of a motor and a speed reducer, comprising a motor and a speed reducer fixed to a mounting frame (9), an input shaft (5) of the speed reducer being rotatably connected to the mounting frame (9) through a bearing B (51), characterized in that: The motor is the automatic self-aligning axial movement motor according to any one of claims 1 to 9.

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