An electric motor that is easy to disassemble and repair

Abstract

The present invention relates to an electric motor that is easy to disassemble and maintain, and the electric motor that is easy to disassemble and maintain includes a casing, a stator core, a fixed key and a pressure plate, the stator core includes an iron core body, a front stator pressure ring and a rear stator pressure ring, the stator core is clearance-matched with the inner wall of the casing, the inner wall of the casing is provided with a positioning platform protruding along the radial direction and a first positioning groove extending along the axial direction, the front stator pressure ring is provided with a second positioning groove, the fixed key is inserted into the first positioning groove and the second positioning groove, the pressure plate is fixed to the casing, the front and rear ends of the fixed key are pressed on the pressure plate and the stator core respectively, and the rear end of the rear stator pressure ring is pressed on the positioning platform. The electric motor that is easy to disassemble and maintain provided by the present invention can realize the disassembly and separation of the stator and the casing without damaging the stator and the casing, thereby facilitating the disassembly and maintenance of the motor.

Description

Technical Field

[0001] The present invention generally relates to the technical field of large-scale mining motors, and more particularly to a motor that is easy to disassemble and repair. Background Art

[0002] Existing large-scale mining motors offer advantages such as simple structure, reliable operation, low losses, and high efficiency, making them widely used in large mines. A mining motor generally consists of a housing, a stator mounted within the housing, and a rotor. The stator of the motor needs to be fixedly assembled with the housing. Currently, there are two methods for assembling the stator and housing: shrink fit and external nailing. The shrink fit method heats the housing, causing the inner wall to expand, and then inserts the stator. This creates an interference fit between the stator and housing. The external nailing method places the stator in the housing and then bolts it to the outer wall of the housing to secure the relative position between the stator and housing. The bolts are then welded to the housing to prevent loosening.

[0003] Although the above two assembly methods can effectively fix the relative position between the stator and the casing, when the stator or casing is damaged during the operation of the motor and needs to be replaced, or when the stator is not properly shrink-fitted during the shrink-fit process and needs to be reinstalled, it is difficult to repair the motor. There is a high probability that both the stator and the casing will be damaged, and other unstable conditions may also occur during use after the repair. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric motor that is easy to disassemble and repair. When the stator or the casing is damaged, the stator and the casing can be disassembled and separated without damaging the other component, thereby facilitating the disassembly and maintenance of the motor.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an electric motor that is easy to disassemble and maintain, including a casing, a stator core installed on the casing, a fixing key and a pressure plate, the stator core including a core body and a front stator pressure ring and a rear stator pressure ring fixedly installed on the front and rear ends of the core body respectively, the stator core is gap-fitted with the inner wall of the casing, a radially protruding positioning platform and an axially extending first positioning groove are provided on the inner wall of the casing, a second positioning groove is provided on the front stator pressure ring, the fixing key is inserted into the first and second positioning grooves, the pressure plate is fixed on the casing, the front and rear ends of the fixing key are respectively pressed on the pressure plate and the stator core, and the rear end of the rear stator pressure ring is pressed on the positioning platform.

[0006] In one embodiment, the first positioning groove and / or the second positioning groove is a wedge-shaped groove.

[0007] In one embodiment, a depth of the second positioning groove along the axial direction of the front stator pressing ring is less than a thickness of the front stator pressing ring.

[0008] In one embodiment, a through slot is provided on the stator core and is arranged along the axial direction of the stator core. The through slot penetrates the stator core from front to back, and the through slot passes through the second positioning slot.

[0009] In one embodiment, there are multiple fixing keys, and the multiple fixing keys are evenly distributed around the axis of the stator core. Each of the fixing keys is inserted into one of the first positioning slots and one of the second positioning slots.

[0010] In one embodiment, the fixing key is a double-wedge fixing key.

[0011] In one embodiment, the number of the fixed keys is 16.

[0012] In one embodiment, an annular groove is formed at the junction of the front end surface and the inner wall of the housing, and the pressure plate is fixed on the annular groove.

[0013] In one embodiment, the pressing plate is fixed to the annular groove by bolts, and the bolts are fixed to the pressing plate by spot welding.

[0014] In one embodiment, a junction between the front end surface of the front stator pressure ring and the inner wall is an inclined surface, and a junction between the rear end surface of the rear stator pressure ring and the inner wall is an inclined surface.

[0015] The present invention is different from the prior art in that the motor provided by the present invention is easy to disassemble and maintain by opening a second positioning groove on the front stator pressure ring of the stator core, opening a first positioning groove on the inner wall of the casing, and inserting a fixing key into the first positioning groove and the second positioning groove. The fixing key simultaneously connects the casing and the stator core that is gap-fitted with the casing, thereby achieving circumferential fixation of the stator core on the casing; at the same time, a pressure plate is fixed on the casing, and the front and rear ends of the fixing key are pressed on the rear surface of the pressure plate and the front end of the stator core respectively, and the rear end of the stator core is pressed on the positioning platform fixed on the casing, thereby achieving axial fixation of the stator core. Therefore, the stator core can be fixedly installed in the casing through the above structure. When the stator core or casing is damaged and needs to be replaced, the pressure plate can be first removed from the casing, and then the fixing key can be pulled out from the first positioning groove and the second positioning groove, so that the stator core can be easily separated from the casing. Therefore, the motor provided by the present invention, which is easy to disassemble and maintain, can realize the disassembly and separation of the stator and the casing without damaging the stator and the casing, thereby facilitating the disassembly and maintenance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 is a cross-sectional view of an electric motor that is easy to disassemble and maintain according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Magnified view at point A in the middle;

[0019] Figure 3 yes Figure 1 Magnified view at point B in the middle;

[0020] Figure 4 yes Figure 1 Enlarged view at center C;

[0021] Figure 5 yes Figure 1 A front view of the motor shown for easy disassembly for maintenance, with the front end cover not visible;

[0022] Figure 6 yes Figure 1 The schematic diagram of the structure of the front stator pressing ring of the motor shown is easy to disassemble and maintain;

[0023] Figure 7 yes Figure 6 Magnified view at point D in the middle;

[0024] Figure 8 yes Figure 6 A front view of the front stator pressing ring is shown;

[0025] Figure 9 yes Figure 1 A front view of the pressure plate of the motor shown for easy disassembly and maintenance;

[0026] Figure 10 It is a structural diagram of a double wedge fixed key;

[0027] Description of reference numerals:

[0028] 1- housing; 11- positioning platform; 2- stator core; 21- core body; 22- front stator pressure ring; 23- rear stator pressure ring; 24- second positioning slot; 25- through slot; 3- fixing key; 4- pressure plate; 5- rotor core; 6- rotating shaft; 71- front end cover; 72- rear end cover; 73- front bearing; 74- rear bearing; 75- front bearing outer cover; 76- front bearing inner cover; 77- rear bearing outer cover; 78- rear bearing inner cover; 8- junction box. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0030] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0031] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] In the present invention, some directional words are defined. In the absence of any contrary explanation, the directional words used, such as "up, down, front, and back", refer to the motor provided by the present invention, which is easy to disassemble and maintain, under normal use conditions and are consistent with the attached Figure 1 The up, down, left, and right directions shown in the figure are consistent. "Inside" and "outside" refer to the inside and outside relative to the motor. These directional words are used for ease of understanding and do not constitute a limitation on the scope of protection of the present invention.

[0033] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0034] Appropriate reference Figure 1As shown, the basic embodiment of the electric motor provided by the present invention, which is easy to disassemble and maintain, includes a casing 1, a stator core 2 installed on the casing 1, a fixing key 3 and a pressure plate 4. The casing 1 can adopt various existing motor casings. The stator core 2 is installed inside the casing 1, and there is a gap fit between the stator core 2 and the inner wall of the casing 1 to facilitate the disassembly and assembly of the stator core 2. The stator core 2 includes a core body 21 and a front stator pressure ring 22 and a rear stator pressure ring 23 fixedly installed at the front and rear ends of the core body 21 respectively. The front stator pressure ring 22 and the rear stator pressure ring 23 are both annular and fixedly connected to the core body 21 by common fixing methods such as bolts.

[0035] The inner wall of the housing 1 is provided with a positioning platform 11 protruding in a radial direction (perpendicular to the axis of the housing) and a first positioning groove extending in an axial direction (the axis of the housing). The positioning platform 11 is located at the rear end of the inner wall of the housing 1. The positioning platform 11 can be formed on the inner wall of the housing 1 by machining or fixed to the inner wall of the housing 1 by welding or other methods. The positioning platform 11 is preferably in the shape of a circular ring and has a rectangular cross-section. The first positioning groove is located at the front end of the inner wall of the housing 1 and is in the shape of an elongated strip. It can be formed by machining on the inner wall of the housing 1.

[0036] refer to Figure 1 、 Figure 6 、 Figure 7 As shown, a second positioning groove 24 is provided on the front stator pressure ring 22. The second positioning groove 24 is located on the front end surface of the front stator pressure ring 22. Figure 1 、 Figure 2 、 Figure 4 As shown, the fixing key 3 is inserted into the first positioning groove and the second positioning groove 24, that is, a part of the fixing key 3 is located in the first positioning groove, and the other part is located in the second positioning groove 24, so that the stator core 2 and the housing 1 are circumferentially fixed by the fixing key 3 to limit the rotation of the stator core 2 in the housing 1. It should be noted that Figure 1 The cutting position is not the middle position of the fixed key 3, and Figure 1 The fixed key 3 shown in FIG is a double wedge fixed key, so Figure 1 、 Figure 2 、 Figure 4 Only a portion of the fixed key 3 is shown in FIG. Figure 1 The dissected position does not pass through the first positioning groove, so the first positioning groove is not shown, and the second positioning groove 24 is partially shown.

[0037] refer to Figure 1 As shown, the pressing plate 4 is fixed on the housing 1, referring to Figure 2 、 Figure 4As shown, the front and rear ends of the fixed key 3 are pressed on the pressure plate 4 and the stator core 2 respectively. Figure 3 As shown, at the same time, the rear end of the rear stator pressure ring 23 is pressed on the positioning platform 11, that is, the rear end of the stator core 2 is pressed on the front end surface of the positioning platform 11. Therefore, through the mutual cooperation of the fixing key 3, the pressure plate 4 and the positioning platform 11, the stator core 2 can be axially fixed in the housing 1 to limit the axial displacement of the stator core 2 in the housing 1.

[0038] When the motor provided by the above basic embodiment is used and is easy to disassemble and repair, if the stator or the housing outlet is damaged, the front cover 71 and the rear cover 72 of the motor can be removed first, and then the pressure plate 4 can be removed from the housing 1, and then the fixing key 3 can be pulled out from the first positioning groove and the second positioning groove 24. Since the fixing key 3 is removed, the axial constraint and circumferential constraint of the stator core 2 are removed, and at the same time, there is a clearance fit between the stator core 2 and the housing 1, so the stator core 2 can be easily removed from the housing 1; when installing a new stator core, the stator core 2 can be removed from the housing 1. When inserting the stator core 2 or the housing 1, first insert the stator core 2 into the housing 1 from the front opening of the housing 1, and press the rear end of the stator core 2 against the front end surface of the positioning platform 11, while keeping the first positioning groove and the second positioning groove 24 opposite each other, then insert the rear end of the fixing key 3 into the first positioning groove, and push it backward along the first positioning groove until the rear end of the fixing key 3 is inserted into the second positioning groove 24, then press the pressure plate 4 against the front end surface of the fixing key 3, and fix the pressure plate 4 to the housing 1, thereby completing the assembly of the stator core 2 and the housing 1. Therefore, compared with the prior art that requires the destruction of the housing or stator core for disassembly and assembly, the motor that is easy to disassemble and maintain provided by the above embodiment can achieve disassembly and assembly of the stator and the housing without damaging the stator and the housing, thereby facilitating the disassembly and maintenance of the motor.

[0039] In the present invention, the fixing key 3 can realize the circumferential fixation of the stator core 2 and the housing 1. The fixing key 3 and the first positioning groove and the second positioning groove 24 matched therewith can adopt various appropriate shapes. For example, the cross-sectional shape of the fixing key 3 is rectangular, and the first positioning groove and the second positioning groove 24 are also rectangular grooves. In one embodiment, referring to Figure 6 、 Figure 7 and Figure 8 As shown, the second positioning groove 24 is a wedge-shaped groove, or the first positioning groove is also a wedge-shaped groove. When the first positioning groove or the second positioning groove 24 is a wedge-shaped groove, the corresponding portion on the fixed key 3 is also the same wedge shape. In one embodiment, the first positioning groove and the second positioning groove 24 are both wedge-shaped grooves, correspondingly, as shown in FIG. Figure 10 As shown, the fixed key 3 is also a double-wedge fixed key. Figure 7 、 Figure 8As shown, the wedge-shaped groove refers to a groove with a trapezoidal cross-section, a large groove bottom width, and a small groove opening width. By setting the first positioning groove and the second positioning groove 24 as wedge-shaped grooves, when the fixing key 3 is inserted into the first positioning groove and the second positioning groove 24, the wedge-shaped inclined surface of the fixing key 3 mates with the wedge-shaped inclined surfaces of the first positioning groove and the second positioning groove 24. Therefore, while the two inclined surfaces of the wedge-shaped groove are used to achieve circumferential fixation of the stator core 2, the stator core 2 can also be radially fixed. Therefore, the requirements for the assembly gap between the stator core 2 and the housing 1 can be reduced, thereby reducing the production cost of the motor. At the same time, the wedge-shaped inclined surface of the fixing key 3 mates with the wedge-shaped inclined surface of the first positioning groove and / or the second positioning groove 24, which can also reduce the shear force on the fixing key 3, making the connection more stable.

[0040] like Figure 7 、 Figure 8 As shown, in the present invention, in one embodiment, the depth of the second positioning groove 24 along the axial direction of the front stator pressure ring 22 is less than the thickness of the front stator pressure ring 22, that is, the second positioning groove 24 does not penetrate the front stator pressure ring 22 in the axial direction of the front stator pressure ring 22. By setting the axial depth of the second positioning groove 24 along the front stator pressure ring 22 to be less than the thickness of the front stator pressure ring 22, when the inner side of the rear end of the fixing key 3 is inserted into the second positioning groove 24, the rear end of the fixing key 3 is pressed on the front stator pressure ring 22, which can ensure that the front stator pressure ring 22 is firmly fixed to the stator core body 21, and can also prevent the fixing key 3 from directly contacting the stator core body 21 and damaging the stator core body 21.

[0041] In the present invention, in order to facilitate the removal of the fixing key 3, it is further preferred that the stator core 2 is provided with a through slot 25 arranged along the axial direction of the stator core 2, and the through slot 25 passes through the stator core 2 from front to back, that is, the through slot 25 is formed on the front stator pressure ring 22, the stator core body 21 and the rear stator pressure ring 23. Figure 7 As shown, the through slot 25 passes through the second positioning slot 24. When repairing the motor, first remove the front cover 71 and the rear cover 72 mounted on the housing 1. Then, a tool (such as a push rod with a rectangular cross section) is inserted into the through slot 25 from the rear end and pushed forward to eject and remove the fixing key 3 installed in the first positioning slot and the second positioning slot 24.

[0042] In the present invention, in order to better fix the stator core 2 on the housing 1, preferably, as Figure 5 As shown, the number of the fixed keys 3 is multiple, and the multiple fixed keys 3 are evenly distributed around the axis of the stator core 2, as shown in FIG. Figure 6 、 Figure 8As shown, a plurality of second positioning grooves 24 are also evenly distributed on the front stator pressure ring 22; similarly, a plurality of first positioning grooves are also evenly distributed on the inner wall of the casing 1, and the number of first positioning grooves and second positioning grooves 24 is the same, and each of the fixing keys 3 is inserted into one of the first positioning grooves and one of the second positioning grooves 24. Preferably, the number of the first positioning grooves, the second positioning grooves 24 and the fixing keys 3 are the same. In the present invention, by providing a plurality of fixing keys 3 evenly distributed around the stator core 2, the stator core 2 can be fixed to the casing 1 at multiple points in the circumferential direction, thereby improving the fixing reliability between the stator core 2 and the casing 1. In the present invention, preferably, the number of the fixing keys 3 is 16.

[0043] In order to facilitate the fixing of the pressing plate 4, in a preferred embodiment of the present invention, as Figure 1 、 Figure 4 As shown, an annular groove is provided at the junction of the front end surface and the inner wall of the housing 1, and the pressing plate 4 is fixed on the annular groove. Figure 9 As shown, the pressing plate 4 is annular in shape and has a plurality of mounting holes formed therein. Correspondingly, a plurality of threaded holes are formed in the annular groove. The pressing plate 4 is fixed to the annular groove by bolts, and the bolts are spot-welded to the pressing plate 4. In this embodiment, the pressing plate 4 is fixed to the housing 1 by bolts, and the bolts are spot-welded to the pressing plate 4. This prevents the bolts from loosening and affecting the stability of the motor. Furthermore, when repairing the motor, the stator core 2 can be disassembled by simply destroying the pressing plate 4. This ensures stable operation of the motor while facilitating maintenance and reducing maintenance costs.

[0044] like Figure 6 、 Figure 7 As shown, in the present invention, the junction between the front end face of the front stator pressing ring 22 and the inner wall is an inclined surface, and the junction between the rear end face of the rear stator pressing ring 23 and the inner wall is an inclined surface. By providing the above-mentioned inclined surfaces on both the front stator pressing ring 22 and the rear stator pressing ring 23, damage to components such as the windings can be avoided during assembly of the motor.

[0045] The present invention is described in detail below with reference to a preferred embodiment of the present invention.

[0046] like Figure 1 As shown, the present embodiment provides an electric motor that is easy to disassemble and maintain, including a housing 1, a stator core 2 mounted on the housing 1, a rotor core 5, a rotating shaft 6, a front end cover 71, a rear end cover 72, a front bearing 73, a rear bearing 74, a front bearing outer cover 75, a front bearing inner cover 76, a rear bearing outer cover 77, a rear bearing inner cover 78, a junction box 8, a fixing key 3 and a pressure plate 4.

[0047] The stator core 2 includes a core body 21 and a front stator pressing ring 22 and a rear stator pressing ring 23 fixedly mounted on the front and rear ends of the core body 21 by bolts. The stator core 2 is fitted with a small gap between the inner wall of the housing 1. The inner wall of the housing 1 is provided with a positioning platform 11 protruding in the radial direction and a first positioning groove extending in the axial direction. Figure 3 As shown, the positioning platform 11 is annular and has a rectangular cross-section, and is welded to the rear end of the inner wall of the housing 1. The number of the first positioning grooves is 16, which are evenly distributed around the axis of the housing 1. Figure 6-8 As shown, the front stator pressing ring 22 is provided with second positioning grooves 24. The depth of the second positioning grooves 24 along the axial direction of the front stator pressing ring 22 is less than the thickness of the front stator pressing ring 22. There are 16 second positioning grooves 24, which are evenly distributed around the axis of the stator core 2. Both the first positioning grooves 24 and the second positioning grooves 24 are wedge-shaped grooves.

[0048] like Figure 10 As shown, the fixing key 3 is a double wedge fixing key, that is, the cross section of the fixing key 3 is composed of two wedge shapes with opposite small ends. Figure 5 As shown, the number of the fixed keys 3 is 16. Figure 2 As shown, the rear end of each fixed key 3 is inserted into a second positioning groove 24 on the front stator pressure ring 22, and is inserted into a first positioning groove on the housing 1. Figure 4 As shown, an annular groove is provided at the junction of the front end surface and the inner wall of the housing 1, and the pressing plate 4 is fixed on the annular groove. Figure 9 As shown, the pressing plate 4 is annular, with multiple mounting holes opened on the pressing plate 4 and multiple threaded holes opened on the annular groove. The pressing plate 4 is fixed to the annular groove by bolts, and the bolts are spot-welded to the pressing plate 4.

[0049] like Figure 2 and Figure 4 As shown, the front and rear ends of the fixed key 3 are pressed on the pressure plate 4 and the stator core 2 respectively, as shown in FIG. Figure 3 As shown, the rear end of the rear stator pressing ring 23 is pressed on the positioning platform 11 .

[0050] like Figure 1As shown, the front end cover 71 and the rear end cover 72 are fixedly mounted on the front end and the rear end of the casing 1 by bolts, the front bearing inner cover 76 and the rear bearing inner cover 78 are fixedly mounted on the front end cover 71 and the rear end cover 72, the rotating shaft 6 is rotatably mounted on the front bearing inner cover 76 and the rear bearing inner cover 78 through the front bearing 73 and the rear bearing 74, the front bearing outer cover 75 is mounted on the front bearing inner cover 76, the rear bearing outer cover 77 is mounted on the rear bearing inner cover 78, the rotor core 5 is fixedly mounted on the rotating shaft 6, and the terminal box 8 is fixedly mounted on the casing 1.

[0051] When assembling the various components of the above-mentioned motor, the stator core 2 can be first inserted into the casing 1, and the outer wall of the rear stator pressure ring 23 of the stator core 2 contacts the positioning platform 11 on the casing 1. There is a small gap between the outer wall of the stator core 2 and the inner wall of the casing 1. Then, the double wedge fixing key 3 is inserted into the first positioning groove on the inner wall of the motor casing 1 until the insertion end is inserted into the second positioning groove 24 of the front stator pressure ring 22, thereby achieving circumferential fixation of the stator core 2. Then, the pressure plate 4 is installed, and the bolts are passed through the mounting holes of the pressure plate 4 and fastened to the threaded holes on the annular groove of the casing 1. Then, the bolts are spot welded to fix them, and finally, the rotating shaft 6 and each end cover are installed.

[0052] When the above-mentioned motor is working, the rotor rotates and the stator core 2 is circumferentially fixed by the double wedge fixing key 3, so that the rotor and the stator will not rotate relative to each other, and the positioning platform 11 and the pressure plate 4 in the casing 1 can realize the axial fixation of the stator core 2, so that the entire motor can achieve smooth rotation.

[0053] The motor provided by the present invention is easy to disassemble and repair. If the housing 1 or the stator core 2 is damaged during installation or use of the motor, the stator core 2 can be disassembled and separated from the housing 1 without damaging the other component, thereby realizing convenient and quick maintenance of the motor. This can save maintenance time and maintenance costs, thereby reducing the chance of the motor being scrapped.

[0054] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes, and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in practicing the present invention, various alternatives to the embodiments of the present invention described herein may be employed. The appended claims are intended to define the scope of protection of the present invention and therefore cover modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. An electric motor that is easy to disassemble and repair, characterized in that , comprising a housing (1), a stator core (2) mounted on the housing (1), a fixing key (3) and a pressure plate (4), wherein the stator core (2) comprises a core body (21) and a front stator pressure ring (22) and a rear stator pressure ring (23) respectively fixedly mounted on the front and rear ends of the core body (21), the stator core (2) is clearance-matched with the inner wall of the housing (1), the inner wall of the housing (1) is provided with a positioning platform (11) protruding in the radial direction and a first positioning groove extending in the axial direction, and the front stator pressure ring (22) is provided with a second positioning groove (24), The fixing key (3) is inserted into the first positioning groove and the second positioning groove (24), the pressure plate (4) is fixed on the housing (1), the front and rear ends of the fixing key (3) are pressed on the pressure plate (4) and the front stator pressure ring (22) respectively, and the rear end of the rear stator pressure ring (23) is pressed on the positioning platform (11), wherein the stator core (2) is provided with a through groove (25) arranged along the axial direction of the stator core (2), the through groove (25) penetrates the stator core (2) from front to back, and the through groove (25) passes through the second positioning groove (24).

2. The motor that is easy to disassemble and maintain according to claim 1, characterized in that: The first positioning groove and / or the second positioning groove (24) is a wedge-shaped groove.

3. The motor that is easy to disassemble and maintain according to claim 1, characterized in that: The depth of the second positioning groove (24) along the axial direction of the front stator pressing ring (22) is less than the thickness of the front stator pressing ring (22).

4. The motor that is easy to disassemble and maintain according to any one of claims 1 to 3, characterized in that: There are multiple fixing keys (3), and the multiple fixing keys (3) are evenly distributed around the axis of the stator core (2), and each fixing key (3) is inserted into one of the first positioning slots and one of the second positioning slots (24).

5. The motor that is easy to disassemble and maintain according to claim 4, characterized in that: The fixed key (3) is a double-wedge fixed key.

6. The motor that is easy to disassemble and maintain according to claim 4, characterized in that: The number of the fixed keys (3) is 16.

7. The motor that is easy to disassemble and maintain according to claim 1, characterized in that: An annular groove is provided at the junction of the front end surface and the inner wall of the casing (1), and the pressing plate (4) is fixed on the annular groove.

8. The motor that is easy to disassemble and maintain according to claim 7, characterized in that: The pressure plate (4) is fixed to the annular groove by means of bolts, and the bolts are fixed to the pressure plate (4) by spot welding.

9. The motor that is easy to disassemble and maintain according to claim 1, characterized in that: The junction between the front end face of the front stator pressing ring (22) and the inner wall is an inclined surface, and the junction between the rear end face of the rear stator pressing ring (23) and the inner wall is an inclined surface.

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