A large and medium-sized permanent magnet motor assembly system and assembly process using sliding bearings

Abstract

The present invention discloses an assembly system for large and medium-sized permanent magnet motors using sliding bearings. The motor comprises the following components: a rotor shaft, a permanent magnet rotor unit, a stator housing containing a stator winding, a shaft-extended end rotor bracket, a non-shaft-extended end rotor bracket, a shaft-extended end motor end cover, a non-shaft-extended end end cover, a shaft-extended end sliding bearing, and a non-shaft-extended end sliding bearing. The side of the permanent magnet rotor unit is provided with a plurality of process threaded holes in a circumferential array, and the non-shaft-extended end rotor bracket is hollowed out with a plurality of process hollowed holes along the axis, and each process hollowed hole is aligned one by one with the plurality of process threaded holes in the axial direction. The present invention effectively solves the assembly problem of medium and large permanent magnet motors using sliding bearings.

Description

Technical Field

[0001] The invention belongs to the field of motor assembly. Background Art

[0002] Because permanent magnet synchronous motors do not require electrical excitation, rotor losses are extremely low, and the motors have the characteristics of high power factor, high efficiency, and high power density. In recent years, permanent magnet motors have occupied an important position in the industrial and mining industries.

[0003] With the upgrading of technology and market demand, permanent magnet motors are becoming more and more widely used in large and medium-sized motors.

[0004] Because sliding bearings are oil-lubricated, their radial load capacity is far greater than that of rolling bearings, and they are simple to maintain. Therefore, they are often used in the bearings of medium and large motors. However, because permanent magnet motors have permanent magnets on their rotors, the stator and rotor have strong adsorption within the motor base. During traditional assembly processes, sliding bearings not only experience axial movement, making it difficult to accurately position them on the shaft, but also face difficulties in aligning the holes during the shaft drilling process. This makes it difficult to use sliding bearings in medium and large permanent magnet motors. To address this, our company has developed a sliding bearing assembly tool and process for medium and large permanent magnet motors, suitable for assembling sliding bearings in permanent magnet motors. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an assembly system and process for large and medium-sized permanent magnet motors using sliding bearings, which solves the assembly problems of medium and large permanent magnet motors based on sliding bearings.

[0006] Technical Solution: To achieve the above objectives, the present invention provides an assembly system for large and medium-sized permanent magnet motors using sliding bearings. The motor includes the following components:

[0007] Rotor shaft, permanent magnet rotor unit, stator housing containing stator winding, shaft extension end rotor bracket, non-shaft extension end rotor bracket, shaft extension end motor end cover, non-shaft extension end cover, shaft extension end sliding bearing, non-shaft extension end sliding bearing;

[0008] The side of the permanent magnet rotor unit is provided with a plurality of process threaded holes in a circumferential array, and the non-axially extended end rotor bracket is hollowed out with a plurality of process hollow holes along the axis, and each process hollow hole is aligned one by one with the plurality of process threaded holes in the axial direction;

[0009] The assembly system includes an annular locking process cover and a plurality of axial locking screws; the annular locking process cover is provided with a plurality of locking screw penetration holes; when the annular locking process cover is coaxially fixedly mounted on the outside of the non-axial extension end sealing cover, the penetration holes of the locking screws are coaxially aligned with one process hollow hole and one process threaded hole;

[0010] The axial locking screw can pass through the aligned locking screw through hole and the process hollow hole in sequence, and finally the end is locked on the process threaded hole; the axial locking screw is threaded with two nuts, and the annular locking process cover is clamped between the two nuts.

[0011] Furthermore, the end of the rotor shaft has a threaded hole for connecting a lifting ring; the assembly system also includes a lifting ring and a lifting rope.

[0012] Furthermore, the assembly system also includes an assembly base, which includes an upper flange ring body and a lower ring body, and the upper flange ring body and the lower ring body are fixedly connected by a plurality of pillars distributed in a circumferential array.

[0013] Furthermore, the assembly system also includes a guide process end cover; the guide process end cover is a rotating body structure as a whole, including an outer ring disk and an inner ring disk distributed up and down, and the inner ring of the outer ring disk and the outer ring of the inner ring disk are integrally connected through a coaxial cylindrical wall; the inner ring of the inner ring disk is coaxially fixed with an axial extension end constraint ring; the inner wall of the cylindrical wall is distributed with a number of reinforcing ribs in a circular array.

[0014] Optionally, the inner diameter of the shaft extension end restraint ring is consistent with the outer diameter of the shaft extension section of the rotor shaft and they are clearance-matched with each other.

[0015] Furthermore, an assembly process for an assembly system of a large or medium-sized permanent magnet motor using sliding bearings is characterized by:

[0016] Assembly process:

[0017] Step 1: The stator housing containing the stator winding, the shaft-end rotor bracket, and the guide process end cover are fixedly assembled from top to bottom coaxially into one body. The structure composed of the stator housing, the shaft-end rotor bracket, and the guide process end cover is recorded as a stator assembly;

[0018] Step 2: Vertically hoist the stator assembly from the previous step onto the assembly base, and coaxially connect and tighten the upper flange ring of the assembly base to the lower end of the stator assembly with bolts;

[0019] Step 3: Lift the tail end of the rotor shaft with the permanent magnet rotor unit installed, and slowly insert the permanent magnet rotor unit and the rotor shaft into the inner cavity of the stator housing from the upper end of the stator housing containing the stator winding;

[0020] During the gradual descent of the rotor shaft during the hoisting process, the shaft extension at the lower end of the rotor shaft first smoothly passes through the support ring sleeve a, whose inner diameter is significantly larger than the outer diameter of the shaft extension; then the shaft extension at the lower end of the rotor shaft continues downward to pass through the shaft extension end restraint ring, whose inner diameter is consistent with the outer diameter of the shaft extension;

[0021] After the shaft extension section at the lower end of the rotor shaft passes through the shaft extension end restraint ring, the rotor shaft and the stator housing enter a coaxial state under the restraint of the shaft extension end restraint ring;

[0022] Step 4: After the shaft extension section at the lower end of the rotor shaft passes smoothly through the shaft extension end restraint ring, the rotor pad is fixed to the lower end of the rotor shaft with a countersunk bolt;

[0023] Step 5: After the shaft extension section at the lower end of the rotor shaft successfully passes through the shaft extension end constraint ring, the rotor shaft continues to descend. Under the coaxial constraint of the shaft extension end constraint ring, the rotor shaft support section a successfully passes through the support ring sleeve a coaxially, and the stator is released from the hoisting state; the non-shaft extension end rotor bracket is coaxially assembled to the upper part of the stator housing using conventional methods, and the rotor shaft support section b passes through the support ring sleeve b, so that the stator and rotor are coaxial.

[0024] Step 6: The non-axial end cover is coaxially fixedly assembled to the upper end of the stator housing. At the same time, the annular locking process cover is coaxially fixedly installed on the upper end of the non-axial end sealing cover. At this time, the through holes of each locking screw are coaxially aligned with a process hollow hole and a process threaded hole. Then, the axial locking screw is sequentially passed through the aligned locking screw through hole and the process hollow hole, and finally the end is locked on the process threaded hole; two nuts are threaded on the axial locking screw, and the annular locking process cover is clamped between the two nuts; in this way, the rotor shaft is axially locked;

[0025] Step 7: Turn over the motor that has been axially locked in the previous step and place it horizontally on the ground.

[0026] Step 8: Remove the assembly base, guide process end cover and rotor pad; and install the shaft extension end motor end cover at the shaft extension end of the stator housing;

[0027] Then, the axial position of the rotor in the stator is adjusted axially by means of the annular locking process cover, the axial locking screw and the nut until the stator and rotor are aligned;

[0028] Step nine, remove the annular locking process cover, and then according to the conventional sliding bearing assembly process, install the shaft extension end sliding bearing and the non-shaft extension end sliding bearing on the shaft extension end motor end cover and the non-shaft extension end cover respectively, and install the upper and lower rotor bushings of the bearing, so that the shaft extension end sliding bearing and the non-shaft extension end sliding bearing are rotated and matched with the sliding bearing installation section a and the sliding bearing installation section b of the rotor shaft respectively, thereby completing the bearing assembly.

[0029] Optionally, the upper end of the shaft extension end restraint ring is coaxially provided with an annular inner edge, and the inner diameters of the shaft extension end restraint ring and the annular inner edge are both larger than the outer diameter of the shaft extension section of the rotor shaft;

[0030] The inner ring of the shaft extension end restraint ring is provided with a plurality of concentricity restraint lever units distributed in a circumferential array.

[0031] The cam is secured to the upper and lower ends of the cams and is secured to the upper and lower ends of the cams and is secured to the chassis at the bottom and the chassis at the bottom.

[0032] Beneficial effects: The present invention effectively solves the assembly problem of medium and large permanent magnet motors based on sliding bearings. During the assembly and hole matching process, the improved scheme not only has a better radial constraint effect, but also enables the shaft extension section at the lower end of the rotor shaft to pass through the shaft extension end constraint ring with a larger inner diameter more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Attachment Figure 1 The assembled motor structure;

[0034] Attachment Figure 2 Schematic diagram of the motor shaft;

[0035] Attachment Figure 3 The schematic diagram of the guide process end cover structure is as follows;

[0036] Attachment Figure 4 This is a schematic diagram of the assembly base structure;

[0037] Attachment Figure 5 It is a schematic diagram of the structure of the annular locking process cover;

[0038] Attachment Figure 6 This is a schematic diagram of “Step 1”;

[0039] Attachment Figure 7 This is a schematic diagram of “Step 2”;

[0040] Attachment Figure 8 This is a schematic diagram of “Step 3”;

[0041] Attachment Figure 9 This is a schematic diagram of “Step 4”;

[0042] Attachment Figure 10 This is a schematic diagram of “Step Five”;

[0043] Attachment Figure 11 This is a diagram of “Step 6”;

[0044] Attachment Figure 12 This is a schematic diagram of “Step 7”;

[0045] Attachment Figure 13 This is a schematic diagram of “Step 8”;

[0046] Attachment Figure 14 This is a schematic diagram of "Step Nine";

[0047] Attachment Figure 15 This is a schematic diagram of “Step 10”;

[0048] Attachment Figure 16 The diagram is a schematic diagram of the improved structure of the restraining ring at the shaft extension end;

[0049] Attachment Figure 17 For the Figure 16 "After the improvement, the shaft extension section at the lower end of the rotor shaft passes through the shaft extension end restraint ring. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the accompanying drawings.

[0051] As attached Figures 1 to 17 The assembly system for large and medium-sized permanent magnet motors using sliding bearings;

[0052] The specific structure of the assembled medium and large permanent magnet motor is as follows:

[0053] like Figure 1 and 2, including a rotor shaft 11, a permanent magnet rotor unit 13, a stator housing 6 including a stator winding 5, a shaft-end rotor bracket 3, a non-shaft-end rotor bracket 7, a shaft-end motor end cover 4, a non-shaft-end end cover 8, a shaft-end sliding bearing 1, a non-shaft-end sliding bearing 10, a shaft-end sealing cover 2, and a non-shaft-end sealing cover 9; the rotor shaft 11 includes a shaft-end section 11.1, a sliding bearing mounting section 11.2, a support section 11.6, a rotor mounting section 11.7, a support section 11.4 and a b sliding bearing mounting section 11.5 in the length direction; the permanent magnet rotor unit 13 is coaxially fixed to the rotor mounting section 11.7 of the rotor shaft 11, and the stator winding 5 is coaxially fixed to the inner wall of the stator housing 6 and has a clearance fit with the outer ring of the permanent magnet rotor unit 13; the shaft-end motor end cover 4 and the non-shaft-end end cover 8 are coaxially fixedly connected to both ends of the stator housing 6 through a flange connection structure; the shaft-end The rotor bracket 3 and the non-shaft extension end rotor bracket 7 are both rotating body structures, and are respectively fixedly installed coaxially on the inner side of the shaft extension end motor end cover 4 and the inner side of the non-shaft extension end cover 8; the inner rings of the shaft extension end rotor bracket 3 and the non-shaft extension end rotor bracket 7 are respectively coaxially fixed with a support ring sleeve 14 and b support ring sleeve 12, and the a support section 11.6 and b support section 11.4 of the rotor shaft 11 are movable through the a support ring sleeve 14 and b support ring sleeve 12 respectively; the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10 are respectively installed on the shaft extension end motor end cover 4 and the non-shaft extension end cover 8, and the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10 are respectively rotatably matched with the a sliding bearing mounting section 11.2 and b sliding bearing mounting section 11.5 of the rotor shaft 11; the shaft extension end sealing cover 2 and the non-shaft extension end sealing cover 9 are respectively sealed and installed on the upper side of the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10.

[0054] The structure of this motor is specially designed for the assembly process as follows:

[0055] The side of the permanent magnet rotor unit 13 is provided with a plurality of process threaded holes 41 in a circumferential array, and the non-axially extended end rotor bracket 7 is hollowed out with a plurality of process hollow holes 54 along the axis. Each process hollow hole 54 is aligned one by one with the plurality of process threaded holes 41 in the axial direction; the end of the rotor shaft 11 has a threaded hole for connecting the lifting ring 16.

[0056] Assembly systems for assembling the above-mentioned medium and large permanent magnet motors, such as Figure 3 、 4 、5 as shown:

[0057] The assembly structure and devices required include a lifting ring 16 , a lifting rope 15 , an assembly base 17 , a guide process end cover 18 , an annular locking process cover 43 and an axial locking screw 42 .

[0058] The assembly base 17 includes an upper flange ring body 17.1 and a lower ring body 17.2, and the upper flange ring body 17.1 and the lower ring body 17.2 are fixedly connected by a number of pillars 17.3 distributed in a circular array; the guide process end cover 18 is a rotating body structure as a whole, including an outer ring disk 18.3 and an inner ring disk 18.5 distributed up and down, and the inner ring of the outer ring disk 18.3 and the outer ring of the inner ring disk 18.5 are integrally connected through a coaxial cylindrical wall 18.4; the inner ring of the inner ring disk 18.5 is coaxially fixed with an axial extension end restraint ring 18.1; the inner wall of the cylindrical wall 18.4 is provided with a number of reinforcing ribs 18.2 distributed in a circular array.

[0059] There are several locking screw through holes 61 distributed on the annular locking process cover 43; when the annular locking process cover 43 is fixedly installed on the outside of the non-axial end sealing cover 9 through the flange coaxially, each locking screw through hole 61 is coaxially aligned with a process hollow hole 54 and a process threaded hole 41, and the axial locking screw 42 passes through the aligned locking screw through hole 61 and the process hollow hole 54 in turn, and finally the end is locked on the process threaded hole 41; two nuts 55 are threadedly fitted on the axial locking screw 42, and the annular locking process cover 43 is clamped between the two nuts 55.

[0060] The assembly system includes a version before improvement and a version after improvement. It should be noted that the version before improvement is also the invention content of this case and is not prior art.

[0061] Before the improvement, the inner diameter of the shaft extension end restraining ring 18.1 is consistent with the outer diameter of the shaft extension section 11.1 of the rotor shaft 11 and they are clearance-fitted with each other.

[0062] The assembly process of this solution is as follows: Figures 6 to 15 :

[0063] Step 1: The stator housing 6 containing the stator winding 5, the shaft-end rotor bracket 3, and the guide process end cover 18 are fixedly assembled into one piece coaxially from top to bottom by flange connection. The structure consisting of the stator housing 6, the shaft-end rotor bracket 3, and the guide process end cover 18 is recorded as a stator assembly 107.

[0064] Step 2: Place the assembly base 17 on the ground and secure it to the ground. Then, vertically lift the stator assembly 107 from the previous step onto the assembly base 17 using the lifting ring 16, lifting rope 15, and crane. Bolt the upper flange ring 17.1 of the assembly base 17 coaxially with the lower end of the stator assembly 107 and secure it securely.

[0065] Step 3: Use the lifting ring 16, lifting rope 15, and crane to lift the tail end of the rotor shaft 11 with the permanent magnet rotor unit 13 installed. Then, slowly insert the permanent magnet rotor unit 13 and the rotor shaft 11 from the upper end of the stator housing 6 containing the stator winding 5 into the inner cavity of the stator housing 6. During the lifting process, 1 mm stainless steel bars are evenly inserted in the circumferential direction between the rotor and the stator as spacers to facilitate the rotor to slide into the stator inner cavity.

[0066] As the rotor shaft 11 gradually descends during the hoisting process, the shaft extension 11.1 at the lower end of the rotor shaft 11 first smoothly passes downward through the support ring sleeve a, whose inner diameter is significantly larger than the outer diameter of the shaft extension 11.1; then the shaft extension 11.1 at the lower end of the rotor shaft 11 continues downward through the shaft extension end restraining ring 18.1, whose inner diameter is consistent with the outer diameter of the shaft extension 11.1;

[0067] After the shaft extension section 11.1 at the lower end of the rotor shaft 11 passes through the shaft extension end restraining ring 18.1, the rotor shaft 11 and the stator housing 6 enter a coaxial state under the restraint of the shaft extension end restraining ring 18.1, which is conducive to the smooth and coaxial passage of the a support section 11.6 of the rotor shaft 11 through the a support ring sleeve 14 in the subsequent steps;

[0068] During this step, since the outer diameter of the shaft extension section 11.1 at the lower end of the rotor shaft 11 is consistent with the inner diameter of the shaft extension end restraint ring 18.1, the shaft extension section 11.1 at the lower end of the rotor shaft 11 will not pass through the shaft extension end restraint ring 18.1 smoothly. Therefore, it is necessary to set at least four adjustment cables 31 at the lower part of the rotor shaft 11. The cables 31 are adjusted in various directions until the shaft extension section 11.1 at the lower end of the rotor shaft 11 passes through the shaft extension end restraint ring 18.1 smoothly. Even so, the passage process is still difficult and is prone to collision.

[0069] Step 4: After the shaft extension section 11.1 at the lower end of the rotor shaft 11 passes through the shaft extension end restraint ring 18.1 smoothly, the rotor pad 30 is fixed to the lower end of the rotor shaft 11 with a countersunk bolt to prevent the shaft extension from directly contacting the ground plane and damaging the shaft head when the rotor falls.

[0070] Step 5: After the shaft extension section 11.1 at the lower end of the rotor shaft 11 successfully passes through the shaft extension end restraint ring 18.1, the rotor shaft 11 continues to descend. Under the coaxial constraint of the shaft extension end restraint ring 18.1, the a support section 11.6 of the rotor shaft 11 successfully passes through the a support ring sleeve 14 coaxially; until the rotor pad 30 touches the ground; then the lifting ring 16 and the lifting rope 15 are used to release the stator from the lifting state; finally, the non-shaft extension end rotor bracket 7 is coaxially assembled to the upper part of the stator housing 6 using conventional methods, and the b support section 11.4 of the rotor shaft 11 is passed through the b support ring sleeve 12, so that the stator and rotor are coaxial.

[0071] Step 6: The non-axial end cover 8 is coaxially fixedly assembled to the upper end of the stator housing 6. At the same time, the annular locking process cover 43 is coaxially fixedly installed on the upper end of the non-axial end sealing cover 9. At this time, each locking screw through-hole 61 is coaxially aligned with a process hollow hole 54 and a process threaded hole 41. Then, the axial locking screw 42 is sequentially passed through the aligned locking screw through-hole 61 and the process hollow hole 54, and finally the end is locked on the process threaded hole 41; two nuts 55 are threaded on the axial locking screw 42, and the annular locking process cover 43 is clamped between the two nuts 55; in this way, the rotor shaft 11 is axially locked;

[0072] Step 7: Use a crane to turn over the motor that has been axially locked in the previous step and place it horizontally on the ground.

[0073] Step eight, remove the assembly base 17, the guide process end cover 18 and the rotor pad 30; and install the shaft end motor end cover 4 at the shaft end of the stator housing 6;

[0074] Then, the axial position of the rotor in the stator is adjusted axially by means of the annular locking process cover 43, the axial locking screw 42 and the nut 55 until the stator and rotor are aligned;

[0075] Step 9: Remove the annular locking process cover 43, and then install the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10 on the shaft extension end motor end cover 4 and the non-shaft extension end cover 8 respectively according to the conventional sliding bearing assembly process, and install the upper and lower rotor bushings of the bearings, so that the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10 are respectively rotated and matched with the sliding bearing installation section a 11.2 and the sliding bearing installation section b 11.5 of the rotor shaft 11, thereby completing the bearing assembly;

[0076] Step 10: Seal and install the shaft extension end sealing cover 2 and the non-shaft extension end sealing cover 9 on the upper side of the shaft extension end sliding bearing 1 and the non-shaft extension end sliding bearing 10 respectively, and the motor installation is completed.

[0077] In the above process, during "step three", since the outer diameter of the shaft extension section 11.1 at the lower end of the rotor shaft 11 is consistent with the inner diameter of the shaft extension end restraint ring 18.1, the shaft extension section 11.1 at the lower end of the rotor shaft 11 will not pass through the shaft extension end restraint ring 18.1 smoothly. Even if four adjustment cables 31 are used, the passing process is very difficult and is likely to cause collision. Therefore, the following improvements are made in this solution:

[0078] like Figure 16The upper end of the shaft extension restraint ring 18.1 is integrally provided with an annular inner edge 28 coaxially. To facilitate smooth passage of the shaft extension section 11.1 at the lower end of the rotor shaft 11 through the shaft extension restraint ring 18.1 in "Step 3", the inner diameters of the improved shaft extension restraint ring 18.1 and the annular inner edge 28 are significantly larger than the outer diameter of the shaft extension section 11.1 of the rotor shaft 11. This allows the shaft extension section 11.1 at the lower end of the rotor shaft 11 to smoothly pass through the shaft extension restraint ring 18.1. At the same time, to achieve coaxial restraint of the shaft extension section 11.1, the following structure is designed:

[0079] The inner ring of the shaft extension end restraint ring 18.1 is provided with a plurality of concentricity restraint lever units 23 in a circumferential array; the concentricity restraint lever unit 23 comprises an articulated shaft 29, an upper lever arm 27 and a lower lever arm 31 fixedly connected to the inner wall of the shaft extension end restraint ring 18.1 through the shaft seat 110; an articulated sleeve 300 is rotatably mounted on the outer coaxial surface of the articulated shaft 29, and the lower end of the upper lever arm 27 and the upper end of the lower lever arm 31 are fixedly connected to the articulated sleeve 300; the upper lever arm 27 and the lower lever arm 31 form an angle of less than 180° on the side close to the axis of the shaft extension end restraint ring 18.1; the upper end of the upper lever arm 27 is close to the shaft extension end restraint ring 18.1. On one side of the axis of the ring 18.1 is an upper lever restraining end 25 with a circular arc transition, and on the side of the lower end of the lower lever arm 31 close to the axis of the shaft extension restraining ring 18.1 is a lower lever restraining end 32 with a circular arc transition; the upper end of the upper lever arm 27, away from the axis of the shaft extension restraining ring 18.1, is connected to the reinforcing rib 18.2 via a tension spring 26. Under normal circumstances, under the pull of the tension spring 26, the side of the upper lever arm 27 away from the axis of the shaft extension restraining ring 18.1 is limited to contact the inner ring of the annular inner edge 28, so that the upper lever arm 27 is exactly vertical, and the lower lever arm 31 is closer to the axis of the shaft extension restraining ring 18.1 as it moves downward;

[0080] In "step three", when the shaft extension section 11.1 at the lower end of the rotor shaft 11 gradually passes downward through the shaft extension end restraint ring 18.1 with a larger inner diameter, as shown in FIG. Figure 17 The outer contour of the lower end of the shaft extension section 11.1 presses downward on each oblique lower lever arm 31, so that each lower lever arm 31 adaptively swings downward around its respective hinge axis 29 under the downward pressure of the shaft extension section 11.1; at the same time, each originally vertical upper lever arm 27 automatically swings around the hinge axis 29 in a direction toward each other;

[0081] When the shaft extension section 11.1 of the rotor shaft 11 completely passes downward through the shaft extension end restraint ring 18.1, the upper restraint end 25 and the lower restraint end 32 of each concentricity restraint lever unit 23 are just sliding tangent to the shaft extension section 11.1 of the rotor shaft 11; at this time, the upper lever arms 27 and the lower lever arms 31 are interlocked under the action of the outer cylindrical surface of the shaft extension section 11.1, so that all the concentricity restraint lever units 23 are in a completely locked state. At the same time, several completely locked concentricity restraint lever units 23 in turn implement radial constraints on the shaft extension section 11.1 of the rotor shaft 11, so that the shaft extension section 11.1 of the rotor shaft 11 coincides with the axis of the stator housing 6. This method not only has a better radial restraint effect, but also enables the shaft extension section 11.1 at the lower end of the rotor shaft 11 to pass through the shaft extension end restraint ring 18.1 with a larger inner diameter more smoothly.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An assembly system for a large or medium-sized permanent magnet motor using a sliding bearing, the motor comprising the following components: a rotor shaft (11), a permanent magnet rotor unit (13), a stator housing (6) containing a stator winding (5), a shaft-end rotor bracket (3), a non-shaft-end rotor bracket (7), a shaft-end motor end cover (4), a non-shaft-end end cover (8), a shaft-end sliding bearing (1), and a non-shaft-end sliding bearing (10); Its characteristics are: The side of the permanent magnet rotor unit (13) is provided with a plurality of process threaded holes (41) in a circumferential array, and the non-axial extension end rotor bracket (7) is hollowed out with a plurality of process hollowed holes (54) along the axis, and each process hollowed hole (54) is aligned one by one with the plurality of process threaded holes (41) in the axial direction; The assembly system comprises: an annular locking process cover (43) and a plurality of axial locking screws (42); a plurality of locking screw through holes (61) are distributed on the annular locking process cover (43); when the annular locking process cover (43) is coaxially fixedly installed on the outside of the non-axial extension end sealing cover (9), each locking screw through hole (61) is coaxially aligned with a process hollow hole (54) and a process threaded hole (41); The axial locking screw (42) can sequentially pass through the aligned locking screw through hole (61) and the process hollow hole (54), and finally the end is locked on the process threaded hole (41); two nuts (55) are threadedly matched on the axial locking screw (42), and the annular locking process cover (43) is clamped between the two nuts (55); The assembly system further comprises an assembly base (17), the assembly base (17) comprising an upper flange ring body (17.1) and a lower ring body (17.2), the upper flange ring body (17.1) and the lower ring body (17.2) being fixedly connected via a plurality of pillars (17.3) distributed in a circumferential array; The assembly system further includes a guide process end cover (18); the guide process end cover (18) is an overall rotating body structure, including an outer ring disk (18.3) and an inner ring disk (18.5) distributed up and down, the inner ring of the outer ring disk (18.3) and the outer ring of the inner ring disk (18.5) are integrally connected through a coaxial cylindrical wall (18.4); the inner ring of the inner ring disk (18.5) is fixedly provided with an axial extension end restraining ring (18.1) coaxially; the inner wall of the cylindrical wall (18.4) is provided with a plurality of reinforcing ribs (18.2) distributed in a circumferential array; The inner diameter of the shaft extension end restraining ring (18.1) is consistent with the outer diameter of the shaft extension section (11.1) of the rotor shaft (11), and they are clearance-matched with each other.

2. The assembly system for large and medium-sized permanent magnet motors using sliding bearings according to claim 1, characterized in that: The end of the rotor shaft (11) is provided with a threaded hole for connecting a lifting ring (16); the assembly system also includes a lifting ring (16) and a lifting rope (15).

3. The assembly system for large and medium-sized permanent magnet motors using sliding bearings according to claim 1, characterized in that: The upper end of the shaft extension end restraint ring (18.1) is integrally provided with an annular inner edge (28) coaxially, and the inner diameters of the shaft extension end restraint ring (18.1) and the annular inner edge (28) are both larger than the outer diameter of the shaft extension section (11.1) of the rotor shaft (11); and the inner ring of the shaft extension end restraint ring (18.1) is provided with a plurality of concentricity restraint lever units (23) distributed in a circumferential array.

4. The assembly system for large and medium-sized permanent magnet motors using sliding bearings according to claim 3, characterized in that: The concentricity constraint lever unit (23) comprises an articulated shaft (29), an upper lever arm (27) and a lower lever arm (31) which are fixedly connected to the inner wall of the shaft extension end constraint ring (18.1) through an axle seat (110); an articulated sleeve (300) is coaxially rotatably mounted on the outer side of the articulated shaft (29); the lower end of the upper lever arm (27) and the upper end of the lower lever arm (31) are fixedly connected to the articulated sleeve (300); the upper lever arm (27) and the lower lever arm (31) form an angle of less than 180° on the side close to the axis of the shaft extension end constraint ring (18.1); the upper end of the upper lever arm (27) forms an arc on the side close to the axis of the shaft extension end constraint ring (18.1). The upper constraint end (25) of the lever is a transition, and the lower end of the lower lever arm (31) is close to the axis of the shaft extension end constraint ring (18.1) on the side of the lower end of the lever arm (31) as a circular arc transition; the upper end of the upper lever arm (27) is connected to the reinforcing rib (18.2) through the pulling spring (26) on the side away from the axis of the shaft extension end constraint ring (18.1); under normal conditions, under the pulling of the pulling spring (26), the upper lever arm (27) is limited to contact the inner ring of the annular inner edge (28) on the side away from the axis of the shaft extension end constraint ring (18.1), so that the upper lever arm (27) is just vertical, and the lower lever arm (31) is closer to the axis of the shaft extension end constraint ring (18.1) as it goes downward.

5. The assembly process of an assembly system for large and medium-sized permanent magnet motors using sliding bearings according to claim 2, characterized in that: Assembly process: Step 1: The stator housing (6) containing the stator winding (5), the shaft-end rotor bracket (3) and the guide process end cover (18) are fixedly assembled from top to bottom coaxially into one body, and the structure formed by the stator housing (6), the shaft-end rotor bracket (3) and the guide process end cover (18) is recorded as a stator assembly (107); Step 2: vertically hoist the stator assembly (107) from the previous step onto the assembly base (17), and coaxially connect and tighten the upper flange ring (17.1) of the assembly base (17) and the lower end of the stator assembly (107) with bolts; Step 3: Lift the tail end of the rotor shaft (11) on which the permanent magnet rotor unit (13) has been installed, and allow the permanent magnet rotor unit (13) and the rotor shaft (11) to slowly enter the inner cavity of the stator housing (6) from the upper end of the stator housing (6) containing the stator winding (5); During the process of gradually descending the rotor shaft (11) during the hoisting process, the shaft extension section (11.1) at the lower end of the rotor shaft (11) first smoothly passes downward through a support ring sleeve (14) whose inner diameter is significantly larger than the outer diameter of the shaft extension section (11.1); then, the shaft extension section (11.1) at the lower end of the rotor shaft (11) continues downward through a shaft extension end restraining ring (18.1) whose inner diameter is consistent with the outer diameter of the shaft extension section (11.1); After the shaft extension section (11.1) at the lower end of the rotor shaft (11) passes through the shaft extension end restraining ring (18.1), the rotor shaft (11) and the stator housing (6) enter a coaxial state under the restraint of the shaft extension end restraining ring (18.1); Step 4: After the shaft extension section (11.1) at the lower end of the rotor shaft (11) passes smoothly through the shaft extension end restraining ring (18.1), the rotor pad (30) is fixed to the lower end of the rotor shaft (11) with a countersunk bolt; Step 5: After the shaft extension section (11.1) at the lower end of the rotor shaft (11) smoothly passes through the shaft extension end constraint ring (18.1), the rotor shaft (11) continues to descend, and under the coaxial constraint of the shaft extension end constraint ring (18.1), the a support section (11.6) of the rotor shaft (11) smoothly passes through the a support ring sleeve (14) coaxially, thereby releasing the stator from the hoisting state; the non-shaft extension end rotor bracket (7) is coaxially assembled on the upper part of the stator housing (6) using a conventional method, and the b support section (11.4) of the rotor shaft (11) passes through the b support ring sleeve (12), thereby making the stator and rotor coaxial; Step 6: The non-axial end cover (8) is coaxially fixedly assembled to the upper end of the stator housing (6). At the same time, the annular locking process cover (43) is coaxially fixedly installed to the upper end of the non-axial end sealing cover (9). At this time, each locking screw through hole (61) is coaxially aligned with a process hollow hole (54) and a process threaded hole (41). Then, the axial locking screw (42) is sequentially passed through the aligned locking screw through hole (61) and the process hollow hole (54), and finally the end is locked on the process threaded hole (41); two nuts (55) are threaded on the axial locking screw (42), and the annular locking process cover (43) is clamped between the two nuts (55); in this way, the rotor shaft (11) is axially locked; Step 7: Turn over the motor that has been axially locked in the previous step and place it horizontally on the ground; Step eight, remove the assembly base (17), the guide process end cover (18) and the rotor pad (30); and install the shaft extension end motor end cover (4) at the shaft extension end of the stator housing (6); Then, the axial position of the rotor in the stator is axially adjusted by the annular locking process cover (43), the axial locking screw (42) and the nut (55) until the stator and rotor are aligned; Step nine, disassemble the annular locking process cover (43), and then according to the conventional sliding bearing assembly process, install the shaft extension end sliding bearing (1) and the non-shaft extension end sliding bearing (10) on the shaft extension end motor end cover (4) and the non-shaft extension end end cover (8), and install the upper and lower rotor bushings of the bearings, so that the shaft extension end sliding bearing (1) and the non-shaft extension end sliding bearing (10) are respectively rotated with the a sliding bearing installation section (11.2) and b sliding bearing installation section (11.5) of the rotor shaft (11), thereby completing the bearing assembly.

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