Method for embedding magnets in a magnetic levitation motor

Abstract

The application relates to a magnetic suspension motor embedding magnet method, which comprises a rotating shaft, permanent magnets, an embedding magnet tool, a heating device, a first dynamic balance ring and a second dynamic balance ring, and the assembling process comprises several steps, including heating the first balance ring and mounting the first balance ring on the shaft, embedding the permanent magnets and fixing the permanent magnets in place by using the embedding magnet tool, repeating the process until all the magnets are assembled, and then tightening the permanent magnets along the rotating shaft axis by using a tensioning tool to ensure that all the permanent magnets are firmly fixed in place. The magnetic suspension motor embedding magnet method provided by the application can effectively improve the rotor embedding magnet precision and improve the production efficiency and quality of the magnetic suspension motor.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation motor assembly technology, and in particular to a method for embedding magnets in a magnetic levitation motor. Background Technology

[0002] Magnetic levitation motors utilize the electromagnetic force of magnetic bearings to levitate the motor rotor in the air, eliminating mechanical contact between the rotor and stator and thus eliminating mechanical friction losses. This results in a low-loss, high-performance motor. While achieving high rotor speeds, it also offers advantages such as no mechanical wear, low energy consumption, low noise, long lifespan, no need for lubrication or sealing, and no oil pollution. The rotor speed of a magnetic levitation motor is limited only by the tensile strength of the rotor material, allowing for very high circumferential speeds, making it increasingly widely used in high-speed equipment.

[0003] In the manufacturing of magnetic levitation motors, magnet embedding is one of the key production processes. Magnet embedding refers to embedding permanent magnets into the stator slots on the rotor to enable the motor to operate. Magnet embedding requires highly precise machining processes and strict quality control to ensure the clearance accuracy and axial symmetry between the permanent magnets and the rotor, thereby ensuring the motor's operating performance and lifespan. During the assembly of the permanent magnets and the rotor, it is usually necessary to first attach the magnet tiles to the rotor surface. Due to the magnetic force of the permanent magnet tiles on the rotor, the magnet tiles may shift, causing them to be unable to be properly assembled into the correct position. This requires continuous adjustment of the permanent magnet's position before using fixtures to fix it, resulting in low assembly efficiency and the inability to guarantee the accuracy and quality of magnet embedding. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a magnetic levitation motor magnetization method that effectively improves rotor magnetization accuracy and enhances the production efficiency and quality of magnetic levitation motors.

[0005] To achieve the above objectives, the magnetic levitation motor magnet embedding method designed in this invention includes a rotating shaft, a permanent magnet, a magnet embedding fixture, a heating device, a first dynamic balancing ring, and a second dynamic balancing ring. The outer surface of the magnet embedding section of the rotating shaft has two rows of threaded holes arranged vertically opposite each other. The magnet embedding fixture includes an equal-width fixture adapted to the width of the permanent magnet, a clamping fixture for radially fixing the permanent magnet, a positioning fixture for axially fixing the permanent magnet, and a tensioning fixture. Assembly is performed according to the following steps:

[0006] S1. Place the first dynamic balancing ring into the heating device for heating and baking;

[0007] S2. Place the heated first dynamic balancing ring onto the rotating shaft;

[0008] S3. The two rows of threaded holes on the shaft are marked as N pole and S pole, respectively.

[0009] S4. Place the equal-width fixture on the magnetic section of the rotating shaft, and make the surface of the equal-width fixture fit against the first dynamic balancing ring;

[0010] S5. Take the positioning fixture and press it against the other width of the equal-width fixture;

[0011] S6. Remove the equal-width fixture and apply glue to the outer surface of the shaft located between the first dynamic balancing ring and the positioning fixture;

[0012] S7. Based on the polarity of the permanent magnet surface, embed the permanent magnet into the marking position with the same polarity between the first dynamic balancing ring and the positioning fixture;

[0013] S8. Use a clamping fixture to hold the permanent magnet and lock the clamping fixture to complete the assembly of one permanent magnet;

[0014] S9. Loosen the positioning fixture and move it to the side away from the first dynamic balancing ring. Then, insert the equidistant fixture between the previously assembled permanent magnet and the positioning fixture, and repeat steps S5-S8 until the assembly of all permanent magnets is completed.

[0015] S10. When all permanent magnets are assembled, the tensioning fixture is fitted into both ends of the rotating shaft and locked, so that the positioning fixture and the first dynamic balance ring are subjected to force to clamp all permanent magnets inward along the axial direction of the rotating shaft;

[0016] S11. Remove the tensioning fixture and positioning fixture.

[0017] S12. Take the second dynamic balancing ring and place it in the heating device for heating and baking;

[0018] S13. Insert the heated second dynamic balancing ring onto the rotating shaft;

[0019] S14. Place the shaft with the assembled permanent magnets, along with the clamping device, into the heating device for baking, and then cool it in the furnace.

[0020] S15. Remove the cooled rotating shaft from the self-heating device and remove the clamping fixture;

[0021] S16. Use glue to fill the gaps between adjacent permanent magnets;

[0022] S17. Use masking tape to cover the glued area and wrap the magnetic section of the shaft with Teflon tape.

[0023] S18. Place the rotating shaft into the oven for baking and heating, and let it cool in the oven to complete the assembly.

[0024] A further embodiment is that the positioning fixture includes a movable sleeve and a fixed sleeve. The fixed sleeve extends axially to form an external threaded portion, and the movable sleeve extends axially to form an internal threaded portion that matches the thread of the external threaded portion. The movable sleeve is threadedly connected to the external threaded portion through the internal threaded portion, and the movable sleeve is configured to be able to rotate coaxially with the external threaded portion through the internal threaded portion.

[0025] A further embodiment is that the clamping fixture includes a first clamping part and a second clamping part. The first clamping part has a first notch, and the second clamping part has a second notch that matches the first notch. The first clamping part and the second clamping part are fastened together by screws so that the first notch and the second notch enclose a clamping space for fixing the rotor magnet.

[0026] A further option is that, in steps S1 and S12, the baking temperature of the heating device is 210°C.

[0027] A further embodiment is that the first dynamic balancing ring has a numbered surface, and in step S2, the numbered surface of the first dynamic balancing ring is fitted onto the rotating shaft with the magnetically embedded segment facing the shaft.

[0028] A further approach is to use masking tape in step S3 to cover the non-magnetic section of the shaft, with the N and S poles on both sides of the two rows of threaded holes on the shaft marked on the masking tape.

[0029] A further option is to, in step S6, after removing the equal-width fixture, use a set screw to lock the threaded hole located between the dynamic balance ring and the positioning fixture, leaving the set screw protruding 5mm, and then apply glue.

[0030] A further embodiment is that the second dynamic balancing ring has a numbered surface, and in step S13, the numbered surface of the second dynamic balancing ring is fitted onto the rotating shaft with the magnetically embedded section facing the shaft.

[0031] A further option is that, in step S14, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

[0032] A further option is that, in step S18, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

[0033] The magnetic levitation motor embedding method designed in this invention can effectively improve the rotor embedding accuracy and improve the production efficiency and quality of magnetic levitation motors. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the positioning fixture in Example 1;

[0035] Figure 2 This is a schematic diagram of the clamping fixture in Example 1;

[0036] Figure 3 This is a schematic diagram of the permanent magnet being positioned and clamped by the positioning fixture and clamping fixture in Example 1.

[0037] Among them: first clamping part 1, first notch 11, second clamping part 2, second notch 21, clamping space 3, movable sleeve 4, internal thread part 41, fixed sleeve 5, external thread part 51, rotating shaft 100, permanent magnet 200, threaded hole 101, and first dynamic balancing ring 300. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] Example 1.

[0040] like Figure 1 As shown, the magnetic levitation motor magnetization method described in this embodiment includes a rotating shaft 100, a permanent magnet 200, a magnetization fixture, a heating device, a first dynamic balancing ring 300, and a second dynamic balancing ring. The outer surface of the magnetization section of the rotating shaft 100 has two rows of threaded holes 101 arranged vertically opposite each other. The magnetization fixture includes a width-matching fixture adapted to the width of the permanent magnet 200, a clamping fixture for radially fixing the permanent magnet 200, a positioning fixture for axially fixing the permanent magnet 200, and a tensioning fixture. Assembly is performed according to the following steps:

[0041] S1. Place the first dynamic balancing ring 300 into the heating device for heating and baking;

[0042] S2. Fit the heated first dynamic balancing ring 300 onto the rotating shaft 100;

[0043] S3. The two rows of threaded holes 101 on the rotating shaft 100 are marked as N pole and S pole respectively, which facilitates the subsequent assembly of permanent magnet 200.

[0044] S4. Place the equal-width fixture on the magnetic section of the rotating shaft 100, and make the surface of the equal-width fixture fit against the first dynamic balance ring 300.

[0045] S5. Take the positioning fixture and press it against the other width of the equal width fixture; the positioning fixture mentioned in this embodiment is used in the same way and working principle as the prior art. For example, the equal width fixture is pressed against one side of the area where the first dynamic balance ring 300 is located by using an annular sleeve, and the annular sleeve is fixed by the threaded hole 101 on the rotating shaft 100.

[0046] S6. Remove the equal-width fixture and apply glue to the outer surface of the rotating shaft 100 located between the first dynamic balancing ring 300 and the positioning fixture;

[0047] S7. Based on the polarity of the curved surface of the permanent magnet 200, embed the permanent magnet 200 into the marked position with the same polarity between the first dynamic balancing ring 300 and the positioning fixture; since the width of the equal-width fixture is adapted to the width of the permanent magnet 200, after the positioning fixture clamps the equal-width fixture, the distance between the first dynamic balancing ring 300 and the positioning fixture is adapted to the width of the permanent magnet 200. At this time, the permanent magnet 200 can be embedded into the corresponding marked position according to the polarity of the curved surface of the permanent magnet 200, so that the permanent magnet 200 is clamped between the first dynamic balancing ring 300 and the positioning fixture in the correct position and orientation, thereby ensuring the accuracy and stability of the magnetic field.

[0048] S8. Use a clamping fixture to hold the permanent magnet 200 and lock the clamping fixture to complete the assembly of one permanent magnet 200; in this way, by using the clamping fixture to radially clamp the permanent magnet 200, the permanent magnet 200 can be more tightly connected to the rotating shaft 100 by glue, preventing the permanent magnet 200 from not moving or losing its position during the assembly process, thereby improving assembly accuracy and production efficiency.

[0049] S9. Loosen the positioning fixture and move it to the side away from the first dynamic balancing ring 300. Then, insert the equidistant fixture between the previously assembled permanent magnet 200 and the positioning fixture. Repeat steps S5-S8 until all permanent magnets 200 are assembled. In this way, the previous permanent magnet 200 is fixed on the rotating shaft 100 by the clamping fixture and remains stationary. Then, loosen the positioning fixture and move it to the side away from the dynamic balancing ring. Insert the equal-width fixture between the previous permanent magnet 200 and the positioning fixture. Then, clamp the equal-width fixture between the previously fixed permanent magnet 200 and the positioning fixture using the positioning fixture. Finally, repeat steps S5-S8 until all permanent magnets 200 are assembled.

[0050] S10. When all permanent magnets 200 are assembled, the tensioning fixture is fitted into both ends of the rotating shaft 100 and locked, so that the positioning fixture and the first dynamic balancing ring 300 are subjected to force to clamp all permanent magnets 200 inward along the axial direction of the rotating shaft 100; this can ensure the accuracy of the gap and position between the permanent magnets 200, thereby ensuring the rotor magnetization accuracy of the magnetic levitation motor and preventing the permanent magnets 200 from loosening or shifting.

[0051] S11. Remove the tensioning and positioning fixtures to facilitate subsequent processing and assembly.

[0052] S12. Take the second dynamic balancing ring and place it in the heating device for heating and baking;

[0053] S13. Insert the heated second dynamic balancing ring into the rotating shaft 100;

[0054] S14. Place the rotating shaft 100 with the permanent magnet 200 assembled together with the clamping device into the heating device for baking, and then cool it in the oven; in order to accelerate the curing of the adhesive and the bonding between the permanent magnet 200 and the rotating shaft 100, enhance the adhesion of the permanent magnet 200 and ensure its stability during operation.

[0055] Remove the cooled rotating shaft 100 from the S15 self-heating device and remove the clamping fixture.

[0056] S16. Use glue to fill the gaps between adjacent permanent magnets 200; this improves the tightness between the permanent magnets 200, reduces the gaps between them, and thus improves the uniformity and stability of their magnetic field.

[0057] S17. Use masking tape to cover the glue filling area and use Teflon tape to wrap the magnetic section of the rotating shaft 100; In this embodiment, the masking tape can enhance the mechanical strength and wear resistance of the glue filling area, and the Teflon tape can reduce the friction and wear between the rotor and the stator, and improve the efficiency and life of the motor.

[0058] S18. Place the rotating shaft 100 into the oven for baking and heating, and let it cool in the oven to complete the assembly.

[0059] like Figure 1 As shown, in some embodiments of the present invention, the positioning fixture includes a movable sleeve 4 and a fixed sleeve 5. The fixed sleeve 5 extends axially and forms an external thread portion 51. The movable sleeve 4 extends axially and forms an internal thread portion 41 that matches the thread of the external thread portion 51. The movable sleeve 4 is threadedly connected to the external thread portion 51 through the internal thread portion 41, and the movable sleeve 4 is configured to rotate coaxially with respect to the external thread portion 51 through the internal thread portion 41. In use, as... Figure 3 As shown, the fixed sleeve 5 is fixed to the rotating shaft 100 through the threaded hole 101 on the rotating shaft 100, and the movable sleeve 4 is separated from the first dynamic balancing ring 300 by a certain distance. Then, the equal width fixture is placed between the movable sleeve 4 and the first dynamic balancing ring 300. Then, the movable sleeve 4 is rotated, and through the cooperation of the internal thread 41 and the external thread 51, the movable sleeve 4 moves along the axial direction of the rotating shaft 100 towards the area where the first dynamic balancing ring 300 is located, and cooperates with the first dynamic balancing ring 300 to clamp the equal width fixture inward. Since the width of the equal width fixture is adapted to the width of the permanent magnet 200, after the equal width fixture is removed, the permanent magnet 200 can be embedded between the movable sleeve 4 and the first dynamic balancing ring and maintain its fixed position. Then, the permanent magnet 200 can be clamped by the clamping fixture.

[0060] like Figure 2As shown, in some embodiments of the present invention, the clamping fixture includes a first clamping part 1 and a second clamping part 2. The first clamping part 1 has a first notch 11, and the second clamping part 2 has a second notch 21 adapted to the first notch 11. The first clamping part 1 and the second clamping part 2 are fastened together by screws so that the first notch 11 and the second notch 21 enclose a clamping space 3 for fixing the rotor magnet. In use, as... Figure 3 As shown, the first clamping part 1 and the second clamping part 2 are arranged opposite to each other, so that the permanent magnet 200 is placed between the first clamping part 1 and the second clamping part 2. The first clamping part 1 and the second clamping part 2 are pre-tightened by screws. After confirming that the clamping position is correct, the first clamping part 1 and the second clamping part 2 are fixedly connected by screws, so that the first notch 3 and the second notch 5 enclose a clamping space 7 to fix the permanent magnet 200 on the rotating shaft 100, which facilitates subsequent assembly operations.

[0061] A further option is that, in steps S1 and S12, the baking temperature of the heating device is 210°C.

[0062] A further embodiment involves the first dynamic balancing ring 300 having a numbered surface. In step S2, the numbered surface of the first dynamic balancing ring 300 is oriented towards the magnetically embedded segment of the rotating shaft 100 before being fitted onto the rotating shaft 100. In this embodiment, the numbered surface helps determine the position and orientation of the dynamic balancing ring, ensuring that the first dynamic balancing ring 300 is correctly installed.

[0063] A further step is to use masking tape in step S3 to cover the non-magnetic section of the shaft 100, with the N and S poles on both sides of the two rows of threaded holes 101 on the shaft 100 marked on the masking tape. This prevents glue from sticking to the non-magnetic section of the shaft 100 and effectively avoids scratching the outer surface of the shaft 100 during assembly.

[0064] A further step is to, in step S6, after removing the equal-width fixture, use a set screw to tighten the threaded hole 101 located between the dynamic balance ring and the positioning fixture, leaving the set screw protruding 5mm, and then apply adhesive. This ensures that the threaded hole 101 can be completely sealed, preventing air gaps from forming between the threaded hole 101 and the subsequently assembled permanent magnet 200.

[0065] A further embodiment involves the second dynamic balancing ring having a numbered surface. In step S13, the numbered surface of the second dynamic balancing ring is fitted onto the rotating shaft 100 with the magnetically embedded segment facing the shaft. In this embodiment, the numbered surface helps determine the position and orientation of the dynamic balancing ring, ensuring the correct installation of the first dynamic balancing ring 300.

[0066] A further option is that, in step S14, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

[0067] A further option is that, in step S18, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

[0068] The magnetic levitation motor embedding method provided in this embodiment can effectively improve the rotor embedding accuracy and improve the production efficiency and quality of the magnetic levitation motor.

[0069] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for magnetizing a magnetic levitation motor, comprising a rotating shaft (100), a permanent magnet (200), a magnetizing fixture, a heating device, a first dynamic balancing ring (300), and a second dynamic balancing ring, wherein the outer surface of the magnetizing section of the rotating shaft (100) is provided with two rows of threaded holes (101) arranged vertically opposite to each other, and the magnetizing fixture comprises an equal-width fixture adapted to the width of the permanent magnet (200), a clamping fixture for radially fixing the permanent magnet (200), a positioning fixture for axially fixing the permanent magnet (200), and a tensioning fixture, characterized in that, Follow these steps to assemble: S1. Place the first dynamic balancing ring (300) into the heating device for heating and baking; S2. Insert the heated first dynamic balancing ring (300) into the rotating shaft (100). S3. The two rows of threaded holes (101) on the rotating shaft (100) are marked as N pole and S pole respectively; S4. Place the equal width fixture on the magnetic section of the rotating shaft (100) and make the surface of the equal width fixture fit against the first dynamic balancing ring (300). S5. Take the positioning fixture and press it against the other width of the equal-width fixture; S6. Remove the equal-width fixture and apply glue to the outer surface of the rotating shaft (100) located between the first dynamic balancing ring (300) and the positioning fixture; S7. Based on the polarity of the curved surface of the permanent magnet (200), embed the permanent magnet (200) into the marking position with the same polarity between the first dynamic balancing ring (300) and the positioning fixture; S8. Use a clamping fixture to hold the permanent magnet (200) and lock the clamping fixture to complete the assembly of one permanent magnet (200); S9. Loosen the positioning fixture and move it to the side away from the first dynamic balancing ring (300). Then, insert the equidistant fixture between the previously assembled permanent magnet (200) and the positioning fixture, and repeat steps S5-S8 until all permanent magnets (200) are assembled. S10. When all permanent magnets (200) are assembled, the tensioning fixture is fitted into both ends of the rotating shaft (100) and locked, so that the positioning fixture and the first dynamic balance ring (300) are subjected to force to clamp all permanent magnets (200) inward along the axial direction of the rotating shaft (100). S11. Remove the tensioning fixture and positioning fixture. S12. Take the second dynamic balancing ring and place it in the heating device for heating and baking; S13. Insert the heated second dynamic balancing ring into the rotating shaft (100). S14. Place the rotating shaft (100) with the assembled permanent magnet (200) and the clamping device into the heating device for baking, and then cool it in the furnace; S15. Remove the cooled rotating shaft (100) from the self-heating device and remove the clamping fixture; S16. Use glue to fill the gaps between adjacent permanent magnets (200); S17. Use masking tape to cover the glue filling area and use Teflon tape to wrap around the magnetic section of the pivot (100); S18. Place the rotating shaft (100) into the oven for baking and heating, and let it cool in the oven to complete the assembly; The positioning fixture includes a movable sleeve (4) and a fixed sleeve (5). The fixed sleeve (5) extends axially to form an external threaded portion (51). The movable sleeve (4) extends axially to form an internal threaded portion (41) that is adapted to the thread of the external threaded portion (51). The movable sleeve (4) is threadedly connected to the external threaded portion (51) through the internal threaded portion (41). The movable sleeve (4) is configured to be able to rotate coaxially with the external threaded portion (51) through the internal threaded portion (41).

2. The magnetic levitation motor magnetization method according to claim 1, characterized in that, The clamping fixture includes a first clamping part (1) and a second clamping part (2). The first clamping part (1) has a first notch (11), and the second clamping part (2) has a second notch (21) that matches the first notch (11). The first clamping part (1) and the second clamping part (2) are fastened together by screws so that the first notch (11) and the second notch (21) enclose a clamping space (3) for fixing the rotor magnet.

3. The magnetic levitation motor magnetization method according to claim 1, characterized in that, In steps S1 and S12, the baking temperature of the heating device is 210°C.

4. The magnetic levitation motor magnetization method according to claim 1, characterized in that, The first dynamic balancing ring has a numbered surface. In step S2, the numbered surface of the first dynamic balancing ring is inserted into the rotating shaft with the magnetically embedded section facing the shaft.

5. The magnetic levitation motor magnetization method according to claim 1, characterized in that, in In step S3, masking tape is used to cover the non-magnetic section of the shaft, and the N and S poles on both sides of the two rows of threaded holes on the shaft are marked on the masking tape.

6. The magnetic levitation motor magnetization method according to claim 1, characterized in that, in In step S6, after removing the equal-width fixture, use a set screw to tighten the threaded hole between the dynamic balance ring and the positioning fixture, leaving the set screw protruding 5mm, and then apply glue.

7. The magnetic levitation motor magnetization method according to claim 1, characterized in that, The second dynamic balancing ring has a numbered surface. In step S13, the numbered surface of the second dynamic balancing ring is inserted into the rotating shaft with the magnetically embedded section facing the shaft.

8. The magnetic levitation motor magnetization method according to claim 1, characterized in that, In step S14, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

9. The magnetic levitation motor magnetization method according to claim 1, characterized in that, In step S18, the baking temperature of the heating device is 120°C, the baking time is 3 hours, and the oven is cooled for 8 hours.

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