Method for assembling rotor of long-shaft permanent magnet motor

Abstract

The invention relates to the technical field of motor assembly, in particular to a long-shaft permanent magnet motor rotor assembly method, which comprises the steps of S1, mounting a rotor shaft sleeve front tool on a rotor shaft; s2, a spigot ring base is installed on a spigot ring of the motor shell, and a rotor shaft sleeve rear tool is installed on the spigot ring base; s3, the spigot ring base is fixed to the motor spigot ring through a fastener, and the rotor shaft sleeve rear tool is fixed to the spigot ring base; and S4, pushing the rotor shaft into the stator inner ring. According to the invention, the problem that the motor is damaged due to long-time and long-distance sliding friction caused by mutual adsorption of the rotor and the inner ring of the stator due to magnetic attraction force when the rotor of the long-axis permanent magnet motor is assembled can be solved.

Description

Technical Field

[0001] This application relates to the technical field of motor assembly, and in particular to a method for assembling a rotor of a long-shaft permanent magnet motor. Background Technology

[0002] In long-shaft permanent magnet motor systems used in high-end equipment, rotor assembly processes face a series of severe challenges. Because the magnets of permanent magnet motor rotors typically adopt surface-mount or embedded array structures and use permanent magnet materials with high magnetic energy product, such as neodymium iron boron or samarium cobalt, when the radial air gap between the rotor containing the magnets and the inner ring of the stator is reduced to a certain critical distance, an extremely strong nonlinear magnetic attraction force will be generated between them, which can reach hundreds or even thousands of Newtons.

[0003] This magnetic attraction causes the rotor to spontaneously shift towards the inner wall of the stator during assembly, resulting in large-area mechanical collisions and friction between the motor rotor and the inner ring of the stator. Especially during the assembly of long-shaft motors, the greater rotor length exacerbates the assembly difficulty due to the coupling effect of its flexible deformation and magnetic attraction. Specifically, the rotor's bending deformation under gravity coupled with the magnetic attraction creates complex mechanical behavior. Specific problems include: 1. Risk of mechanical damage: Due to magnetic attraction, the rotor is prone to prolonged and long-distance sliding friction with the inner wall of the stator during assembly. This friction can lead to microscopic scratches on the surface of the stator silicon steel sheets, localized peeling of the permanent magnet coating, and wear stripes on the shaft surface. These damages significantly alter the electromagnetic symmetry of the motor, causing distortion of the air gap magnetic field and severely affecting the motor's electromagnetic performance and mechanical lifespan.

[0004] In high-speed motors, such assembly damage can also cause dynamic imbalance. The centrifugal force caused by uneven mass distribution can intensify the vibration of the motor during operation, and may even lead to serious faults such as bearing failure or rotor rubbing, resulting in catastrophic consequences.

[0005] 2. Low assembly efficiency: Traditional assembly methods rely on experience, requiring operators to repeatedly adjust the rotor position using levers, shims, and other auxiliary tools to avoid the influence of magnetic attraction. Due to the lack of effective positioning and guiding devices, the assembly of a single motor can take several hours or even longer, severely impacting production cycle time and making it difficult to guarantee consistent assembly quality. Summary of the Invention

[0006] To address the problem of motor damage caused by mutual attraction and prolonged, long-distance sliding friction between the rotor and stator inner rings due to magnetic attraction during the assembly of a long-shaft permanent magnet motor rotor, this application provides a method for assembling a long-shaft permanent magnet motor rotor.

[0007] The technical solution for assembling a long-shaft permanent magnet motor rotor provided in this application is as follows: A method for assembling a long-shaft permanent magnet motor rotor includes S1. Installing a rotor bushing front fixture onto a rotor shaft. The rotor bushing front fixture includes a first outer ring, a front end indicator structure, and a first inner contact block. The front end indicator structure includes a plurality of annularly arranged front-end algae-based mechanoluminescent sensors. One end of each front-end algae-based mechanoluminescent sensor is connected to the first outer ring, and the other end is connected to the first inner contact block. The end of the first inner contact block away from the front-end algae-based mechanoluminescent sensor is used to contact the rotor shaft. S2. Installing a stop ring base on a stop ring on a motor housing, and installing a rotor bushing rear fixture on the stop ring base. The rotor bushing rear fixture includes a second outer ring, a rear end indicator structure, and a rear end indicator structure. The rear-end indicator structure includes a plurality of annularly arranged rear-end algae-based mechanoluminescent sensors. One end of each rear-end algae-based mechanoluminescent sensor is connected to the second outer ring, and the other end is connected to the second inner contact block. The end of the second inner contact block away from the rear-end algae-based mechanoluminescent sensor is used to contact the rotor. S3. The stop ring base is fixed to the motor stop ring with fasteners, and the rotor shaft sleeve is fixed to the stop ring base with a tooling. S4. The rotor shaft is pushed into the stator inner ring, and the rotor shaft position is adjusted according to the luminous position and luminous intensity of the front-end indicator structure. The rotor shaft angle is adjusted according to the luminous position and luminous intensity of the rear-end indicator structure.

[0008] By adopting the above technical solution, the front tooling of the rotor bushing, the base of the stop ring, and the rear tooling of the rotor bushing are used to form a front and rear support structure. During assembly, this avoids long-term, long-distance sliding friction between the rotor and the inner wall of the stator due to magnetic attraction, solving problems such as scratches on the surface of the stator silicon steel sheets, peeling of the permanent magnet coating, and wear on the surface of the shaft, thus protecting the electromagnetic performance and mechanical life of the motor. At the same time, the rotor shaft position is adjusted according to the luminous position and intensity of the front-end indicator structure, and the rotor shaft angle is adjusted according to the luminous position and intensity of the rear-end indicator structure, ensuring that the rotor and stator maintain a safe distance during assembly and do not have direct contact. This makes the assembly operation more convenient, faster, and more controllable, improving production efficiency and optimizing the production cycle. The alkaloid-based mechanoluminescent sensor can operate normally without the influence of the strong magnetic field inside the motor, and its internal mechanoluminescent material can support the continuous operation of the alkaloid-based mechanoluminescent sensor for at least five months.

[0009] Optionally, the rotor shaft is fixedly connected to the rotor, and the rotor shaft has multiple rotor shaft segments. In S1, the front tooling of the rotor shaft sleeve cooperates with one of the two rotor shaft segments closest to the rotor that is closest to the output end.

[0010] By adopting the above technical solution, the installation position of the rotor bushing front tooling can be determined, and it can work together with other components in subsequent steps to improve the innovative front and rear double support structure.

[0011] Optionally, the motor housing has two stop rings, and in step S2, the stop ring base is mounted on either of the two stop rings.

[0012] By adopting the above technical solution, not only can the installation location be flexibly selected, but the front and rear double support structure can also play a better role.

[0013] Optionally, one end of the first outer ring is provided with a tapered guide portion, and the end of the rotor shaft sleeve front tooling with the tapered guide portion in S1 faces the output end of the rotor shaft.

[0014] By adopting the above technical solution, the function of the tapered guide is to smoothly correct the rotor shaft through the sliding contact of the tapered surface when the rotor shaft begins to enter the inner hole of the tooling or the inner ring of the stator after the rotor shaft begins to enter the rotor shaft sleeve, so as to reduce the initial misalignment.

[0015] Optionally, in S4, the output end of the rotor shaft is pushed in from one side of the tooling after the rotor shaft sleeve is installed on the motor housing.

[0016] By adopting the above technical solution, the rotor shaft is pushed into the output end from the side where the rotor bushing is installed on the motor housing. The front rotor bushing tooling provides front support, and the combination of the stop ring base and the rear rotor bushing tooling provides rear support, forming a double support structure. This avoids long-term, long-distance sliding friction between the rotor and the stator inner wall during assembly due to strong magnetic attraction. It solves problems such as scratches on the stator silicon steel sheet surface, peeling of permanent magnet coating, and wear on the shaft surface caused by traditional assembly methods, effectively protecting the electromagnetic performance and mechanical life of the motor. At the same time, it ensures that the rotor and stator maintain a safe distance throughout the assembly process, without direct contact, making the assembly operation more convenient, faster, and more controllable, significantly improving production efficiency and optimizing production cycle.

[0017] Optionally, the inner diameter of the tapered guide is larger than the diameter of the rotor shaft segment it mates with, forming a clearance fit. The inner diameter of the space enclosed by the plurality of first inner contact blocks matches the diameter of the rotor shaft segment it mates with. The outer diameter of the first outer ring is larger than the rotor outer diameter and smaller than the stator inner diameter.

[0018] By adopting the above technical solution, the tapered guide part and the rotor shaft section form a clearance fit, which facilitates loading and unloading. The inner diameter of the space enclosed by the first inner contact block matches the diameter of the rotor shaft section it mates with, which can trigger the front algae-based force-luminescent sensor of the front-end indicator structure when the rotor shaft position shifts. The outer diameter of the first outer ring is between the outer diameter of the rotor and the inner diameter of the stator. During the process of the rotor pushing the inner ring of the stator, it can keep the rotor and the inner ring of the stator at a distance, avoid the rotor and the stator being attracted and collided due to the attraction of the magnet, prevent long-distance and long-term friction damage between the rotor and the inner ring of the stator, and protect the electromagnetic performance and mechanical life of the motor. At the same time, it allows the rotor and the stator to maintain a safe distance during assembly, making the assembly operation more convenient, faster and more controllable, and improving production efficiency. After the push-in and subsequent installation and fixing are completed, the tapered guide part and the rotor shaft section form a clearance fit, and the design of the outer diameter of the first outer ring being between the outer diameter of the rotor and the inner diameter of the stator also makes it easy for relevant personnel to remove the front tooling of the rotor shaft sleeve and reuse it.

[0019] Optionally, the outer diameter of the first outer ring is smaller than the inner diameter of the space enclosed by the plurality of second inner contact blocks, and the inner diameter of the space enclosed by the plurality of second inner contact blocks matches the rotor diameter.

[0020] By adopting the above technical solution, it is ensured that the tooling before the rotor bushing can pass smoothly through the tooling after the rotor bushing, and that even if the rotor is deflected during the process of the rotor pushing the inner ring of the stator, the rotor will preferentially abut against the inner diameter of the space enclosed by multiple second inner contact blocks, thereby keeping the first outer ring of the rotor and the inner ring of the stator at a distance, avoiding the rotor from being attracted and colliding with the inner ring of the stator due to the attraction of the magnet. At the same time, after the rotor abuts against the second inner contact block, it will trigger the corresponding rear algae-based mechanoluminescence sensor of the second inner contact block. The operator can adjust the rotor shaft angle by means of auxiliary tools through the luminescence position and luminescence intensity.

[0021] Optionally, the base of the stop ring is made of stainless steel, and the fastener includes a first fastening bolt, which passes through the base of the stop ring and is connected to the stop ring.

[0022] By adopting the above technical solution, a stainless steel stop ring base is used, which is safe, reliable, and can be reused for a long time. The first fastening bolt passes through the stop ring base and connects it to the stop ring, ensuring the stability of the stop ring base and providing a foundation for the tooling after the rotor bushing is installed.

[0023] Optionally, the outer diameter of the second outer ring matches the inner diameter of the stop ring. One end of the second outer ring is provided with a connecting outer edge. The fastener also includes a second fastening bolt, which passes through the connecting outer edge and the stop ring base in sequence and is connected to the stop ring.

[0024] By adopting the above technical solution, the outer diameter of the second outer ring matches the inner diameter of the stop ring, allowing the second outer ring to be positioned on the stop ring base. Connecting the outer edge and the stop ring base with the second fastening bolts sequentially increases the overall strength of the rear support, ensuring that the rotor bushing tooling will not shift or fall off during rotor shaft insertion, thus improving assembly stability. Simultaneously, this connection method makes the disassembly, replacement, and maintenance of the rotor bushing tooling more convenient and faster, reducing maintenance costs and installation / disassembly time.

[0025] Optionally, the first inner contact block, the second inner contact block, the first outer ring, and the second outer ring are all made of transparent nylon.

[0026] By adopting the above technical solutions, the transparent material makes it easy for staff to observe the propulsion status and position of the rotor shaft, as well as the illumination of the front and rear indicator structures; the nylon material has good wear resistance and self-lubricating properties, which can reduce the frictional resistance between the tooling and the rotor and between the tooling and the stator, and avoid scratching the rotor and stator surfaces.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. It avoids sliding friction between the rotor and stator, solving problems such as scratches on the surface of the stator silicon steel sheets, peeling of the permanent magnet coating, and wear on the shaft surface, thus protecting the electromagnetic performance and mechanical life of the motor; 2. It ensures that the rotor and stator maintain a safe distance and do not come into direct contact during assembly. The illumination of the front and rear indicator structures guides workers to adjust the rotor shaft position and angle in a timely manner, reducing the increase in magnetic attraction caused by the shrinkage of the radial air gap. This solves the problem of long assembly time for a single motor under traditional assembly methods, improving production efficiency and optimizing production cycle. 3. The multi-level fixing method ensures the stability of the tooling system and guarantees assembly quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the long-shaft permanent magnet motor during assembly, provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1-front tooling for rotor bushing; 101-first outer ring; 102-first inner contact block; 103-front-end algae-based mechanoluminescent sensor; 2-stop ring base; 3-rear tooling for rotor bushing; 301-second outer ring; 302-second inner contact block; 303-rear-end algae-based mechanoluminescent sensor; 304-connecting outer edge; 4-rotor; 5-stator. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0031] This application discloses an assembly method for a long-shaft permanent magnet motor rotor 4.

[0032] The assembly method for the rotor of a long-shaft permanent magnet motor includes the following steps.

[0033] The long-shaft permanent magnet motor rotor assembly method provided in this application includes: S1. Install the rotor shaft sleeve front fixture 1 onto the rotor shaft; S2. Install the stop ring base 2 on the stop ring of the motor housing, and install the rotor shaft sleeve tooling 3 on the stop ring base 2; S3. Fix the stop ring base 2 to the motor stop ring with fasteners, and fix the rotor shaft sleeve rear tooling 3 to the stop ring base 2; S4. Push the rotor shaft into the inner ring of stator 5.

[0034] Multiple steps were carried out in an orderly manner, forming a complete assembly process that ensured the stable and efficient installation of the long-shaft permanent magnet motor rotor during assembly, avoiding damage to the inner rings of rotor 4 and stator 5 caused by magnetic attraction. Because each step was interconnected, the tooling was prepared in advance, allowing the subsequent installation of rotor 4 to be carried out under the constraint and protection of the tooling, reducing the impact of magnetic attraction and ensuring the assembly quality and service life of the motor.

[0035] like Figure 1 As shown, specifically, the rotor shaft is fixedly connected to the rotor 4. The rotor shaft has multiple rotor shaft segments. When installing the rotor shaft sleeve pre-tool 1, it is fitted with the one closest to the output end of the two rotor shaft segments closest to the rotor 4. The rotor shaft sleeve pre-tool 1 plays a crucial role, acting as a protective ring for the rotor 4 during assembly. The rotor shaft sleeve pre-tool 1 includes a first outer ring 101, a front end indicator structure, and a first inner contact block 102. The front end indicator structure includes multiple annularly arranged front-end algae-based mechanoluminescent sensors 103. One end of each front-end algae-based mechanoluminescent sensor 103 is connected to the first outer ring 101, and the other end is connected to the first inner contact block 102. The connection method can be adhesive or snap-fit. The front-end algae-based mechanoluminescent sensor 103 can emit light when subjected to pressure, and the light intensity is proportional to the received pressure. The end of the first inner contact block 102 away from the front-end algae-based mechanoluminescent sensor 103 is used to contact the rotor shaft.

[0036] The inner diameter of the tapered guide section is larger than the diameter of the rotor shaft section it mates with, forming a clearance fit. This design allows the rotor shaft sleeve front tool 1 to fit onto the rotor shaft without being too tight, making installation or disassembly difficult. The outer diameter of the first outer ring 101 is larger than the outer diameter of the rotor 4 but smaller than the inner diameter of the stator 5. In this way, when the rotor shaft is pushed into the inner ring of the stator 5, the rotor shaft sleeve front tool 1 can form a safe distance limit between the rotor 4 and the inner ring of the stator 5, preventing the rotor 4 from directly contacting the inner ring of the stator 5. The inner diameter of the space enclosed by the multiple first inner contact blocks 102 matches the diameter of the rotor shaft segment that it cooperates with. This allows the rotor shaft to trigger the front-end algae-based force-luminescent sensor 103 through the first inner contact blocks 102 when the rotor shaft is displaced. This enables the operator to determine the specific direction of the rotor shaft displacement by observing the luminous position and intensity of the front-end indicator structure, and to make fine adjustments with auxiliary tools. This ensures that the radial air gap between the inner ring of the rotor 4 and the inner ring of the stator 5 is more evenly distributed around the circumference within the safe distance limit, reducing the impact of magnetic attraction.

[0037] like Figure 1 As shown, specifically, the motor housing has two stop rings, one of which is selected to install the stop ring base 2. The stop ring base 2 serves as a mounting carrier, connecting the motor housing and the rotor bushing tooling 3. The stop ring base 2 is made of stainless steel, which has good strength and can ensure that it will not be easily damaged during assembly, thus providing stable support for the rotor 4. The fasteners used to fix the stop ring base 2 include a first fastening bolt (not shown in the figure), which passes through the stop ring base 2 and connects to the stop ring, fixing the stop ring base 2 to the stop ring on the motor housing and preventing it from loosening during assembly. The fasteners used to fix the rotor bushing tooling 3 also include a second fastening bolt (not shown in the figure), which passes through the outer edge 304 and the stop ring base 2 in sequence and connects to the stop ring. This multi-stage fixing method ensures the stability of the rotor bushing tooling 3 installation.

[0038] like Figure 1 As shown, specifically, after the stop ring base 2 is installed, the rotor bushing rear fixture 3 is installed. The rotor bushing rear fixture 3 includes a second outer ring 301, a rear end indicator structure, and a second inner contact block 302. The rear end indicator structure includes multiple rear end algae-based mechanoluminescent sensors 303 arranged in a ring. One end of the rear end algae-based mechanoluminescent sensor 303 is connected to the second outer ring 301, and the other end is connected to the second inner contact block 302. The connection method can be adhesive or snap-fit. The rear end algae-based mechanoluminescent sensor 303 can emit light when subjected to pressure, and the light intensity is proportional to the pressure received. The end of the second inner contact block 302 away from the rear end algae-based mechanoluminescent sensor 303 is used to contact the rotor 4.

[0039] The outer diameter of the second outer ring 301 matches the inner diameter of the stop ring, and one end of the second outer ring 301 is provided with a connecting outer edge 304. The tooling 3 behind the rotor shaft sleeve not only supports the rotor 4, but the inner diameter of the space enclosed by multiple second inner contact blocks 302 matches the diameter of the rotor 4. This allows the rotor shaft to trigger the rear algae-based force-luminescent sensor 303 through the second inner contact blocks 302 when an angular displacement occurs. This allows the operator to determine the specific direction of the rotor shaft angular displacement by observing the luminous position and intensity of the rear indicator structure, and to make fine adjustments with auxiliary tools. This ensures that the radial air gap between the rotor 4 and the inner ring of the stator 5 is more evenly distributed circumferentially within the safe distance limit, reducing the impact of magnetic attraction.

[0040] In actual operation, if both the front-end and rear-end indicator structures emit light simultaneously, the angle is first fine-tuned based on the rear-end indicator structure. After the angle fine-tuning is completed, the position is fine-tuned based on the front-end indicator structure. If the rear-end indicator structure indicates an angle deviation at this point, the angle is fine-tuned again based on the rear-end indicator structure. It can be understood that during the pushing process, the normal state of the front-end indicator structure is that the front-end force-emitting sensor located below emits a faint light, while the normal state of the rear-end indicator structure is that neither of the rear-end force-emitting sensors emits light.

[0041] In addition, the first inner contact block 102, the second inner contact block 302, the first outer ring 101, and the second outer ring 301 are all made of transparent nylon. The transparent material makes it easy for operators to observe the advancing status and position of the rotor shaft, as well as the illumination of the front and rear indicator structures; the nylon material has good wear resistance and self-lubricating properties, which can reduce the frictional resistance between the tooling and the rotor 4 and between the tooling and the stator 5, and avoid scratching the surfaces of the rotor 4 and the stator 5.

[0042] The implementation principle of this embodiment is as follows: The long-axis permanent magnet motor rotor assembly method provided in this embodiment is significantly innovative compared to traditional assembly processes. Through ingenious tooling design and scientific assembly steps, it forms a complete protection system, effectively resisting magnetic interference during the assembly of the long-axis permanent magnet motor rotor. Each tooling component has a clear division of labor: the front tooling 1 of the rotor bushing is responsible for front-end guidance and protection, while the stop ring base 2 and the rear tooling 3 of the rotor bushing are responsible for rear-end guidance, support, and protection. Together, they significantly reduce the risk of contact between the rotor 4 and the inner ring of the stator 5, minimizing mechanical damage. Moreover, this process does not require operators to rely on experience; even without angular position fine-tuning, it has safe distance limitations, making operation simpler and faster, greatly shortening assembly time and improving production efficiency. Angular position fine-tuning based on the front and rear indicator structures further reduces magnetic interference, while also reducing tooling wear and tear, and avoiding the assembly quality instability caused by human factors in traditional assembly methods. This provides strong support for the large-scale production and application of long-axis permanent magnet motors.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for assembling a rotor of a long-shaft permanent magnet motor, characterized in that, include: S1. Install the rotor (4) shaft sleeve front tooling (1) on the rotor (4) shaft. The rotor (4) shaft sleeve front tooling (1) includes a first outer ring (101), a front end indicator structure and a first inner contact block (102). The front end indicator structure includes a plurality of front algae-based mechanoluminescent sensors (103) arranged in a ring. One end of the front algae-based mechanoluminescent sensor (103) is connected to the first outer ring (101) and the other end is connected to the first inner contact block (102). The end of the first inner contact block (102) away from the front algae-based mechanoluminescent sensor (103) is used to contact the rotor (4) shaft. S2. Install a stop ring base (2) on the stop ring of the motor housing, and install a rotor (4) bushing rear tooling (3) on the stop ring base (2). The rotor (4) bushing rear tooling (3) includes a second outer ring (301), a rear end indicator structure and a second inner contact block (302). The rear end indicator structure includes a plurality of rear end algae-based mechanoluminescent sensors (303) arranged in a ring. One end of the rear end algae-based mechanoluminescent sensor (303) is connected to the second outer ring (301) and the other end is connected to the second inner contact block (302). The end of the second inner contact block (302) away from the rear end algae-based mechanoluminescent sensor (303) is used to contact the rotor (4). S3. Fix the stop ring base (2) to the motor stop ring using fasteners, and fix the rotor (4) shaft sleeve and tooling (3) to the stop ring base (2); S4. Push the rotor (4) shaft into the inner ring of the stator (5), adjust the position of the rotor (4) shaft according to the light emission position and light emission intensity of the front end indicator structure, and adjust the angle of the rotor (4) shaft according to the light emission position and light emission intensity of the rear end indicator structure.

2. The long-shaft permanent magnet motor rotor assembly method according to claim 1, characterized in that, The rotor (4) shaft is fixedly connected to the rotor (4), and the rotor (4) shaft has multiple rotor (4) shaft segments. In S1, the rotor (4) shaft sleeve front tooling (1) cooperates with the one of the two rotor (4) shaft segments closest to the rotor (4) that is closest to the output end.

3. The long-shaft permanent magnet motor rotor assembly method according to claim 2, characterized in that, The motor housing has two stop rings, and in S2, the stop ring base (2) is installed on either of the two stop rings.

4. The long-shaft permanent magnet motor rotor assembly method according to claim 3, characterized in that, One end of the first outer ring (101) is provided with a tapered guide portion, and the end of the front tooling (1) of the rotor (4) shaft sleeve in S1 with the tapered guide portion faces the output end of the rotor (4) shaft.

5. The long-shaft permanent magnet motor rotor assembly method according to claim 4, characterized in that, In S4, the output end of the rotor (4) shaft is pushed in from the side of the tooling (3) after the rotor (4) shaft sleeve is installed on the motor housing.

6. The long-shaft permanent magnet motor rotor assembly method according to claim 4, characterized in that, The inner diameter of the tapered guide is larger than the diameter of the rotor (4) shaft segment that it mates with, forming a clearance fit. The inner diameter of the space enclosed by the plurality of first inner contact blocks (102) matches the diameter of the rotor (4) shaft segment that it mates with. The outer diameter of the first outer ring (101) is larger than the outer diameter of the rotor (4) and smaller than the inner diameter of the stator (5).

7. The method for assembling a long-shaft permanent magnet motor rotor according to claim 6, characterized in that, The outer diameter of the first outer ring (101) is smaller than the inner diameter of the space enclosed by the plurality of second inner contact blocks (302), and the inner diameter of the space enclosed by the plurality of second inner contact blocks (302) matches the diameter of the rotor (4).

8. The long-shaft permanent magnet motor rotor assembly method according to claim 3, characterized in that, The base (2) of the stop ring is made of stainless steel. The fastener includes a first fastening bolt, which passes through the base (2) of the stop ring and is connected to the stop ring.

9. The method for assembling a long-shaft permanent magnet motor rotor according to claim 1, characterized in that, The outer diameter of the second outer ring (301) matches the inner diameter of the stop ring. One end of the second outer ring (301) is provided with a connecting outer edge (304). The fastener also includes a second fastening bolt, which passes through the connecting outer edge (304) and the stop ring base (2) in sequence and is connected to the stop ring.

10. The method for assembling a long-shaft permanent magnet motor rotor according to claim 1, characterized in that, The first inner contact block (102), the second inner contact block (302), the first outer ring (101) and the second outer ring (301) are all made of transparent nylon.

Images