Magnetic suspension motor rotor production method and rotor

Abstract

The invention discloses a magnetic suspension motor rotor production method and a rotor, and relates to the technical field of magnetic suspension motors, and the magnetic suspension motor rotor production method comprises the steps: installing a rotor fixing sleeve on the periphery of the middle section of a shaft body; the shaft body comprises a first mandrel section and a second mandrel section which are located at the two ends of the middle section. A rotor fixing sleeve, a first radial magnetic bearing, a second radial magnetic bearing, a first sensor, a second sensor and an axial magnetic bearing are sequentially installed at preset positions of a shaft body, and meanwhile, appearance machining is conducted on the assembled rotor so that an impeller, an auxiliary bearing and a speed sensor can be installed. The magnetic suspension motor rotor processed according to the method can ensure that each component of the rotor is mounted in place and is properly matched with other components of the motor, so that the structural strength of the rotor and the structure of each part of the rotor can realize a design function, the process is relatively simple, and the production cost is reduced while batch production of the magnetic suspension rotor is realized. And stable operation under the condition of high rotating speed can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic levitation motors, and in particular to a production method for a magnetic levitation motor rotor and a rotor. Background Art

[0002] In recent years, the magnetic levitation motor has been gradually recognized by the market for its advantages of no friction, no need for lubrication, energy saving and consumption reduction, and has entered a rapid development stage. In the entire magnetic levitation motor, the most complex mechanical component is the motor rotor. On the one hand, the structure of each part of the rotor corresponds to the other structures of the motor, with multiple parts such as position and speed sensor detection position, axial magnetic bearing and radial magnetic bearing action position, permanent magnet, etc.; on the other hand, the magnetic levitation motor rotor usually runs at a speed of 15000r / min to 30000r / min or even higher, which requires the magnetic levitation motor rotor to have sufficient strength to cope with the centripetal force caused by high speed. The magnetic levitation motor rotor is very different from the existing motor rotor structure. The overall structure of the magnetic levitation motor rotor is more complex, and the precision requirements during the processing and assembly process are higher.

[0003] Therefore, how to achieve mass production of magnetic levitation rotors while ensuring that they can run smoothly at high speeds is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing a magnetic levitation motor rotor and a rotor, so as to realize mass production of the magnetic levitation rotor and ensure that the rotor can run smoothly at a high speed.

[0005] To achieve the above object, the present invention provides a method for producing a magnetic suspension motor rotor, comprising:

[0006] The rotor fixing sleeve is installed on the outer periphery of the middle section of the shaft body, wherein the shaft body comprises a first core shaft section and a second core shaft section located at two ends of the middle section;

[0007] Install the first radial magnetic bearing on the circumferential surface of the first core shaft segment and fit it to the middle segment, and install the second radial magnetic bearing on the circumferential surface of the second core shaft segment and fit it to the middle segment, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric;

[0008] The first sensor is mounted on the circumferential surface of the first core shaft segment and is attached to the first radial magnetic bearing, and the second sensor is mounted on the circumferential surface of the second core shaft segment and is attached to the second radial magnetic bearing;

[0009] Install the axial magnetic bearing on the circumferential surface of the second core shaft segment and fit it to the end surface of the second sensor facing away from the second radial magnetic bearing to complete the assembly of the rotor;

[0010] The rotor is machined to have a first impeller mounting position and a second impeller mounting position for mounting the impeller, a first auxiliary bearing position and a second auxiliary bearing position for matching with the auxiliary bearing, and a speed sensor detection position for matching with the speed sensor detection.

[0011] Preferably, before the step of installing the rotor fixing sleeve on the outer periphery of the middle section of the shaft body, the method further comprises:

[0012] The coaxial first mandrel, the first magnet fixing block, the permanent magnet, the second magnet fixing block, and the second mandrel are sequentially bonded by high-strength metal glue to form a shaft body, so that part of the first mandrel, the first magnet fixing block, the permanent magnet, the second magnet fixing block, and part of the second mandrel form a middle section;

[0013] The circumferential surface of the middle section having the same size as the outer diameter of the permanent magnet is ground.

[0014] Preferably, between the step of installing the rotor fixing sleeve on the outer periphery of the middle section of the shaft body and the step of installing the first radial magnetic bearing on the circumferential surface of the first core shaft section and fitting it to the middle section, and installing the second radial magnetic bearing on the circumferential surface of the second core shaft section and fitting it to the middle section, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric, the step further includes:

[0015] With the end face of the second mandrel facing away from the first mandrel as the axial reference face, the circumferential face of the first mandrel segment, the circumferential face of the second mandrel segment, and the two end faces of the middle segment are turned and ground.

[0016] Preferably, the first radial magnetic bearing is mounted on the circumferential surface of the first core shaft segment and is fitted to the middle segment, and the second radial magnetic bearing is mounted on the circumferential surface of the second core shaft segment and is fitted to the middle segment, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric, and the first sensor is mounted on the circumferential surface of the first core shaft segment and is fitted to the first radial magnetic bearing, and the second sensor is mounted on the circumferential surface of the second core shaft segment and is fitted to the second radial magnetic bearing. The step also includes:

[0017] The end surface of the second core shaft facing away from the first core shaft is used as the axial reference surface, and the opposite sides of the first radial magnetic bearing and the second radial magnetic bearing are turned and ground.

[0018] Preferably, the axial magnetic bearing is mounted on the circumferential surface of the second core shaft segment and is fitted to the end surface of the second sensor facing away from the second radial magnetic bearing to complete the steps of assembling the rotor and machining the shape of the rotor to machine the first impeller mounting position and the second impeller mounting position for mounting the impeller, the first auxiliary bearing position and the second auxiliary bearing position for matching with the auxiliary bearing, and the speed sensor detection position for matching with the speed sensor detection, and further includes:

[0019] The end surface of the second mandrel facing away from the first mandrel is used as an axial reference surface, and the side of the second sensor facing away from the second radial magnetic bearing is turned and ground.

[0020] Preferably, interference fit is achieved by heat-shrink fitting between the rotor fixing sleeve and the middle section, between the first radial magnetic bearing and the first core shaft section, between the second radial magnetic bearing and the second core shaft section, between the first sensor and the first core shaft section, between the second sensor and the second core shaft section, and between the axial magnetic bearing and the second core shaft section.

[0021] A magnetic levitation motor rotor is manufactured using the above-mentioned magnetic levitation motor rotor production method. The magnetic levitation motor rotor includes a shaft body, and the shaft body includes a first core shaft, a first magnet fixing block, a permanent magnet, a second magnet fixing block, and a second core shaft that are sequentially bonded by high-strength metal glue. The first core shaft and the second core shaft are both stepped shaft structures, and one end of the first core shaft close to the first magnet fixing block, one end of the second core shaft close to the second magnet fixing block, the first magnet fixing block, the permanent magnet, and the second magnet fixing block form a cylindrical middle section with the same diameter.

[0022] Preferably, the outer peripheral sleeve of the middle section is provided with a rotor fixing sleeve, and the rotor fixing sleeve and the middle section are in interference fit;

[0023] The first circumferential surface of the first core shaft is provided with a first radial magnetic bearing, and the second circumferential surface of the second core shaft is provided with a second radial magnetic bearing. There is an interference fit between the first radial magnetic bearing and the first core shaft, and between the second radial magnetic bearing and the second core shaft. The first radial magnetic bearing is attached to the first end face of the middle section, and the second radial magnetic bearing is attached to the second end face of the middle section.

[0024] Preferably, a first sensor is sleeved on the first circumferential surface of the first mandrel, and a second sensor is sleeved on the second circumferential surface of the second mandrel, the first sensor is attached to the third end surface of the first radial magnetic bearing, and the second sensor is attached to the fourth end surface of the second radial magnetic bearing, and the first sensor and the first mandrel, as well as the second sensor and the second mandrel, are both interference fits;

[0025] The rotor fixing sleeve is a circular ring structure, and the first radial magnetic bearing, the second radial magnetic bearing, the first sensor, and the second sensor are all circular ring structures with an outer diameter greater than that of the rotor fixing sleeve.

[0026] Preferably, the second circumferential surface of the second core shaft is also sleeved with an axial magnetic bearing, the axial magnetic bearing is interference fit with the second core shaft, and the axial magnetic bearing is attached to a side of the second sensor away from the first sensor;

[0027] The outer periphery of the first core shaft is also provided with a speed sensor detection position for cooperating with the speed sensor detection.

[0028] With respect to the above background technology, the present invention provides a method for producing a magnetic levitation motor rotor, comprising: installing a rotor fixing sleeve on the outer periphery of the middle section of a shaft body, the shaft body comprising a first core shaft section and a second core shaft section located at both ends of the middle section; installing a first radial magnetic bearing on the circumferential surface of the first core shaft section and fitting it to the middle section, installing a second radial magnetic bearing on the circumferential surface of the second core shaft section and fitting it to the middle section, so that the first radial magnetic bearing and the second radial magnetic bearing are concentric with the shaft body; installing a first sensor on the circumferential surface of the first core shaft section and fitting it to the first radial magnetic bearing, installing a second sensor on the circumferential surface of the second core shaft section and fitting it to the second radial magnetic bearing; installing an axial magnetic bearing on the circumferential surface of the second core shaft section and fitting it to the end face of the second sensor facing away from the second radial magnetic bearing, so as to complete the assembly of the rotor; machining the outer shape of the rotor to machine a first impeller mounting position and a second impeller mounting position for mounting an impeller, a first auxiliary bearing position and a second auxiliary bearing position for cooperating with an auxiliary bearing, and a speed sensor detection position for cooperating with a speed sensor for detection.

[0029] Specifically, by sequentially installing a rotor fixing sleeve, a first radial magnetic bearing, a second radial magnetic bearing, a first sensor, a second sensor, and an axial magnetic bearing to preset positions of the shaft body, and simultaneously performing shape processing on the assembled rotor for the installation of an impeller, an auxiliary bearing, and a speed sensor, the magnetic levitation motor rotor processed according to this method can ensure that each rotor component is installed in place and properly cooperates with other motor components, thereby ensuring the structural strength of the rotor and that the structures of each part of the rotor can achieve the designed functions. The process is relatively simple, and can achieve mass production of magnetic levitation rotors while ensuring that they can run smoothly at high speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] FIG1 is a schematic structural diagram of the bonding of the rotor shaft of a magnetic suspension motor provided by an embodiment of the present invention;

[0032] FIG2 is a schematic diagram of the structure of a rotor fixing sleeve installed on a rotor of a magnetic suspension motor provided by an embodiment of the present invention;

[0033] 3 is a schematic diagram of the structure of a radial magnetic bearing installed on a rotor of a magnetic suspension motor provided by an embodiment of the present invention;

[0034] FIG4 is a schematic diagram of the structure of a sensor installed on the rotor of a magnetic levitation motor provided by an embodiment of the present invention;

[0035] 5 is a schematic diagram of the structure of an axial magnetic bearing installed on the rotor of a magnetic suspension motor provided by an embodiment of the present invention;

[0036] FIG. 6 is a schematic structural diagram of a final product of a magnetic levitation motor rotor provided in an embodiment of the present invention.

[0037] in:

[0038] 11-first core shaft, 111-first circumferential surface, 112-first end surface, 113-middle section, 12-first magnet fixing block, 13-permanent magnet, 14-second magnet fixing block, 15-second core shaft, 151-axial reference surface, 152-second circumferential surface, 153-second end surface, 16-rotor fixing sleeve, 17-first radial magnetic bearing, 171-third end surface, 18-second radial magnetic bearing, 181-fourth end surface, 19-first sensor, 21-second sensor, 211-fifth end surface, 22-axial magnetic bearing, 114-speed sensor detection position, 115-first impeller mounting position, 116-first auxiliary bearing position, 154-second auxiliary bearing position, 155-second impeller mounting position. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The purpose of the present invention is to provide a method for producing a magnetic levitation motor rotor and a rotor, so as to realize mass production of the magnetic levitation rotor and ensure that the rotor can run smoothly at a high speed.

[0042] Please refer to FIG. 1 to FIG. 6 . To achieve the above-mentioned purpose, the present invention provides a method for producing a magnetic suspension motor rotor, comprising:

[0043] The rotor fixing sleeve 16 is installed on the outer periphery of the middle section 113 of the shaft body, and the shaft body includes a first core shaft section and a second core shaft section located at two ends of the middle section 113;

[0044] The first radial magnetic bearing 17 is installed on the circumferential surface of the first core shaft segment and is attached to the middle segment 113, and the second radial magnetic bearing 18 is installed on the circumferential surface of the second core shaft segment and is attached to the middle segment 113, so that the first radial magnetic bearing 17 and the second radial magnetic bearing 18 are concentric with the shaft body;

[0045] The first sensor 19 is mounted on the circumferential surface of the first core shaft segment and is attached to the first radial magnetic bearing 17, and the second sensor 21 is mounted on the circumferential surface of the second core shaft segment and is attached to the second radial magnetic bearing 18;

[0046] Install the axial magnetic bearing 22 on the circumferential surface of the second core shaft segment and fit it to the end surface of the second sensor 21 facing away from the second radial magnetic bearing 18 to complete the assembly of the rotor;

[0047] The rotor's shape is processed to adjust the sizes of the first sensor 19, the second sensor 21, the first radial magnetic bearing 17, the second radial magnetic bearing 18, and the axial magnetic bearing 22 to the design values, and to process the first impeller mounting position 115 and the second impeller mounting position 155 for mounting the impeller, the first auxiliary bearing position 116 and the second auxiliary bearing position 154 for cooperating with the auxiliary bearing, and the speed sensor detection position 114 for cooperating with the speed sensor detection. The processing process ensures appropriate dimensional tolerance, form and position tolerance, and roughness according to the different functions of each structure to generate the final magnetic levitation motor rotor product.

[0048] It should be noted that the first core shaft segment, the middle segment 113 and the second core shaft segment are connected in sequence and coaxially arranged, and the interference fit between the rotor fixing sleeve 16 and the middle segment 113, between the first radial magnetic bearing 17 and the first core shaft segment, between the second radial magnetic bearing 18 and the second core shaft segment, between the first sensor 19 and the first core shaft segment, between the second sensor 21 and the second core shaft segment, and between the axial magnetic bearing 22 and the second core shaft segment are all achieved by heat-fitting, and the interference fit between the rotor fixing sleeve 16 and the middle segment 113, between the first radial magnetic bearing 17 and the first core shaft segment, between the second radial magnetic bearing 18 and the second core shaft segment, between the first sensor 19 and the first core shaft segment, between the second sensor 21 and the second core shaft segment, and between the axial magnetic bearing 22 and the second core shaft segment can be obtained by simulation calculation results.

[0049] By sequentially installing the rotor fixing sleeve 16, the first radial magnetic bearing 17, the second radial magnetic bearing 18, the first sensor 19, the second sensor 21, and the axial magnetic bearing 22 to the preset positions of the shaft body, and simultaneously performing shape processing on the assembled rotor for the installation of the impeller, the auxiliary bearing, and the speed sensor, the magnetic levitation motor rotor processed according to this method can ensure that the various components of the rotor are installed in place and properly cooperate with other components of the motor, thereby ensuring the structural strength of the rotor and that the various parts of the rotor can achieve the designed functions. The process is relatively simple, and can realize mass production of magnetic levitation rotors while ensuring that they can run smoothly at high speeds.

[0050] In this embodiment, before the step of installing the rotor fixing sleeve 16 on the outer periphery of the middle section 113 of the shaft body, it also includes: bonding the coaxial first core shaft 11, the first magnet fixing block 12, the permanent magnet 13, the second magnet fixing block 14, and the second core shaft 15 in sequence by high-strength metal glue to form the shaft body, so that part of the first core shaft 11, the first magnet fixing block 12, the permanent magnet 13, the second magnet fixing block 14, and part of the second core shaft 15 form the middle section 113, and grinding the circumferential surface of the middle section 113 with the same outer diameter as the permanent magnet 13.

[0051] Among them, between the step of installing the rotor fixing sleeve 16 on the outer periphery of the middle section 113 of the shaft body and the step of installing the first radial magnetic bearing 17 on the circumferential surface of the first core shaft section and fitting it to the middle section 113, and installing the second radial magnetic bearing 18 on the circumferential surface of the second core shaft section and fitting it to the middle section 113, so that the first radial magnetic bearing 17 and the second radial magnetic bearing 18 are concentric with the shaft body, it also includes: taking the end surface of the second core shaft 15 away from the first core shaft 11 as the axial reference surface 151, turning and grinding the circumferential surface of the first core shaft section, the circumferential surface of the second core shaft section, and the two end surfaces of the middle section 113.

[0052] Strict axial dimension requirements are adopted to ensure the correct axial position of the subsequent rotor assembly, and to form a suitable interference fit with the inner radial dimensions of the rotor assembly such as the first radial magnetic bearing 17 (the interference amount is determined based on the simulation calculation results). The turning and grinding processes need to ensure high verticality, coaxiality and low surface roughness, and the verticality is processed based on the axis of the shaft.

[0053] It should be noted that the steps of installing the first radial magnetic bearing 17 on the circumferential surface of the first core shaft segment and fitting it to the middle segment 113, and installing the second radial magnetic bearing 18 on the circumferential surface of the second core shaft segment and fitting it to the middle segment 113, so that the first radial magnetic bearing 17 and the second radial magnetic bearing 18 are concentric with the shaft body, and the steps of installing the first sensor 19 on the circumferential surface of the first core shaft segment and fitting it to the first radial magnetic bearing 17, and installing the second sensor 21 on the circumferential surface of the second core shaft segment and fitting it to the second radial magnetic bearing 18, also include: taking the end surface of the second core shaft 15 away from the first core shaft 11 as the axial reference surface 151, turning and grinding the opposite sides of the first radial magnetic bearing 17 and the second radial magnetic bearing 18, and adopting strict axial dimensional requirements to ensure the correct axial position of the subsequent rotor assembly, wherein the turning and grinding processes need to ensure high verticality and low surface roughness.

[0054] In addition, the axial magnetic bearing 22 is installed on the circumferential surface of the second core shaft segment and is fitted to the end face of the second sensor 21 facing away from the second radial magnetic bearing 18 to complete the steps of assembling the rotor and machining the rotor shape, so as to machine the first impeller mounting position 115 and the second impeller mounting position 155 for mounting the impeller, the first auxiliary bearing position 116 and the second auxiliary bearing position 154 cooperating with the auxiliary bearing, and the speed sensor detection position 114 for cooperating with the speed sensor detection. It also includes: taking the end face of the second core shaft 15 facing away from the first core shaft 11 as the axial reference plane 151, turning and grinding the side of the second sensor 21 facing away from the second radial magnetic bearing 18, wherein the side of the second sensor 21 facing away from the second radial magnetic bearing 18 is finely machined by fine turning and fine grinding, and strict axial size requirements are adopted to ensure the correct axial position of the subsequent rotor assembly, wherein the turning and grinding processes need to ensure high verticality and low surface roughness.

[0055] A magnetic levitation motor rotor is manufactured using the above-mentioned magnetic levitation motor rotor production method. The magnetic levitation motor rotor includes a shaft body, and the shaft body includes a first core shaft 11, a first magnet fixing block 12, a permanent magnet 13, a second magnet fixing block 14, and a second core shaft 15 which are sequentially bonded by high-strength metal glue. The first core shaft 11 and the second core shaft 15 are both stepped shaft structures, and the first core shaft 11 is close to one end of the first magnet fixing block 12, the second core shaft 15 is close to one end of the second magnet fixing block 14, the first magnet fixing block 12, the permanent magnet 13, and the second magnet fixing block 14 form an intermediate section 113. The outer circumferences of the various parts of the intermediate section 113 usually have height differences, and are ground into cylindrical intermediate sections 113 with the same diameter.

[0056] The larger end of the first core shaft 11 is attached to the side of the first magnet fixing block 12 away from the permanent magnet 13, and the larger end of the second core shaft 15 is attached to the side of the second magnet fixing block 14 away from the permanent magnet 13. The smaller end of the first core shaft 11 and the smaller end of the second core shaft 15 are both cylindrical structures, and their diameters are smaller than the outer diameter of the middle section 113. The outer periphery of the middle section 113 is provided with a rotor fixing sleeve 16, and the rotor fixing sleeve 16 and the middle section 113 are interference fit.

[0057] The first circumferential surface 111 of the first core shaft 11 is sleeved with a first radial magnetic bearing 17, and the second circumferential surface 152 of the second core shaft 15 is sleeved with a second radial magnetic bearing 18. The first radial magnetic bearing 17 and the first core shaft 11, as well as the second radial magnetic bearing 18 and the second core shaft 15 are interference fit, and the first radial magnetic bearing 17 is attached to the first end surface 112 of the middle section 113, and the second radial magnetic bearing 18 is attached to the second end surface 153 of the middle section 113. The outer diameters of the annular first radial magnetic bearing 17 and the second radial magnetic bearing 18 are larger than the outer diameter of the middle section 113. The specific outer diameter relationship can also be selected according to actual needs as long as the above-mentioned purpose can be achieved.

[0058] In addition, a first sensor 19 is sleeved on the first circumferential surface 111 of the first spindle 11, and a second sensor 21 is sleeved on the second circumferential surface 152 of the second spindle 15. The first sensor 19 is attached to the third end surface 171 of the first radial magnetic bearing 17, and the second sensor 21 is attached to the fourth end surface 181 of the second radial magnetic bearing 18. The first sensor 19 and the first spindle 11, as well as the second sensor 21 and the second spindle 15, are interference fits. The first sensor 19 and the second sensor 21 are preferably external The rotor fixing sleeve 16 is a circular ring structure, the first radial magnetic bearing 17, the second radial magnetic bearing 18, the first sensor 19, and the second sensor 21 are all circular ring structures with an outer diameter greater than the outer diameter of the rotor fixing sleeve 16, and the second circumferential surface 152 of the second core shaft 15 is also sleeved with an axial magnetic bearing 22, the axial magnetic bearing 22 and the second core shaft 15 are interference fit, and the axial magnetic bearing 22 is attached to the fifth end surface 211 of the second sensor 21 away from the first sensor 19;

[0059] The outer periphery of the first core shaft 11 is also provided with a speed sensor detection position 114 for cooperating with the speed sensor detection. The first core shaft 11 and the second core shaft 15 are also provided with a first impeller mounting position 115 and a second impeller mounting position 155 for mounting the impeller, and a first auxiliary bearing position 116 and a second auxiliary bearing position 154 cooperating with the auxiliary bearing.

[0060] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A method for producing a magnetic levitation motor rotor, characterized in that: include: Installing the rotor fixing sleeve on the outer periphery of the middle section of the shaft body, wherein the shaft body comprises a first core shaft section and a second core shaft section located at two ends of the middle section; Installing a first radial magnetic bearing on the circumferential surface of the first core shaft segment and fitting it to the middle segment, and installing a second radial magnetic bearing on the circumferential surface of the second core shaft segment and fitting it to the middle segment, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric; Installing a first sensor on the circumferential surface of the first core shaft segment and fitting it to the first radial magnetic bearing, and installing a second sensor on the circumferential surface of the second core shaft segment and fitting it to the second radial magnetic bearing; Installing the axial magnetic bearing on the circumferential surface of the second core shaft segment and fitting it to the end surface of the second sensor facing away from the second radial magnetic bearing to complete the assembly of the rotor; The rotor is machined to have a first impeller mounting position and a second impeller mounting position for mounting an impeller, a first auxiliary bearing position and a second auxiliary bearing position for matching with an auxiliary bearing, and a speed sensor detection position for matching with a speed sensor for detection.

2. The method for producing a magnetic levitation motor rotor according to claim 1, characterized in that: Before the step of installing the rotor fixing sleeve on the outer periphery of the middle section of the shaft body, the method further includes: The coaxial first core shaft, the first magnet fixing block, the permanent magnet, the second magnet fixing block, and the second core shaft are sequentially bonded by high-strength metal glue to form the shaft body, so that part of the first core shaft, the first magnet fixing block, the permanent magnet, the second magnet fixing block, and part of the second core shaft form the middle section; The circumferential surface of the middle section having the same size as the outer diameter of the permanent magnet is ground.

3. The method for producing a magnetic levitation motor rotor according to claim 1, characterized in that: Between the step of installing the rotor fixing sleeve on the outer periphery of the middle section of the shaft body and the step of installing the first radial magnetic bearing on the circumferential surface of the first core shaft section and fitting it to the middle section, and installing the second radial magnetic bearing on the circumferential surface of the second core shaft section and fitting it to the middle section, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric, the method further includes: The end surface of the second mandrel facing away from the first mandrel is used as an axial reference surface, and the circumferential surface of the first mandrel segment, the circumferential surface of the second mandrel segment, and the two end surfaces of the middle segment are turned and ground.

4. The method for producing a magnetic levitation motor rotor according to claim 1, characterized in that: The step of installing the first radial magnetic bearing on the circumferential surface of the first core shaft segment and fitting it to the middle segment, and installing the second radial magnetic bearing on the circumferential surface of the second core shaft segment and fitting it to the middle segment, so that the first radial magnetic bearing, the second radial magnetic bearing and the shaft body are concentric, and the step of installing the first sensor on the circumferential surface of the first core shaft segment and fitting it to the first radial magnetic bearing, and installing the second sensor on the circumferential surface of the second core shaft segment and fitting it to the second radial magnetic bearing, further includes: The end surface of the second core shaft facing away from the first core shaft is used as an axial reference plane, and the opposite sides of the first radial magnetic bearing and the second radial magnetic bearing are turned and ground.

5. The method for producing a magnetic levitation motor rotor according to claim 1, characterized in that: The step of installing the axial magnetic bearing on the circumferential surface of the second core shaft segment and fitting it to the end surface of the second sensor facing away from the second radial magnetic bearing to complete the assembly of the rotor and the step of machining the shape of the rotor to machine the first impeller mounting position and the second impeller mounting position for mounting the impeller, the first auxiliary bearing position and the second auxiliary bearing position matched with the auxiliary bearing, and the speed sensor detection position for matching the speed sensor detection, further includes: The end surface of the second core shaft facing away from the first core shaft is used as an axial reference plane, and the side of the second sensor facing away from the second radial magnetic bearing is turned and ground.

6. The method for producing a magnetic levitation motor rotor according to claim 1, characterized in that: Interference fit is achieved by shrink-fitting between the rotor fixing sleeve and the middle section, between the first radial magnetic bearing and the first core shaft section, between the second radial magnetic bearing and the second core shaft section, between the first sensor and the first core shaft section, between the second sensor and the second core shaft section, and between the axial magnetic bearing and the second core shaft section.

7. A magnetic levitation motor rotor, manufactured by the magnetic levitation motor rotor production method according to any one of claims 1 to 6, characterized in that: The magnetic levitation motor rotor includes a shaft body, which includes a first core shaft, a first magnet fixing block, a permanent magnet, a second magnet fixing block, and a second core shaft that are sequentially bonded by high-strength metal glue. The first core shaft and the second core shaft are both stepped shaft structures, and the first core shaft is close to one end of the first magnet fixing block, the second core shaft is close to one end of the second magnet fixing block, the first magnet fixing block, the permanent magnet, and the second magnet fixing block form a cylindrical middle section with the same diameter.

8. The magnetic levitation motor rotor according to claim 7, characterized in that: The outer peripheral sleeve of the middle section is provided with a rotor fixing sleeve, and the rotor fixing sleeve and the middle section are in interference fit; The first circumferential surface of the first core shaft is provided with a first radial magnetic bearing, and the second circumferential surface of the second core shaft is provided with a second radial magnetic bearing. There is an interference fit between the first radial magnetic bearing and the first core shaft, and between the second radial magnetic bearing and the second core shaft. The first radial magnetic bearing is attached to the first end surface of the middle section, and the second radial magnetic bearing is attached to the second end surface of the middle section.

9. The magnetic levitation motor rotor according to claim 8, characterized in that: A first sensor is sleeved on the first circumferential surface of the first core shaft, and a second sensor is sleeved on the second circumferential surface of the second core shaft. The first sensor is attached to the third end surface of the first radial magnetic bearing, and the second sensor is attached to the fourth end surface of the second radial magnetic bearing. The first sensor and the first core shaft, as well as the second sensor and the second core shaft, are both interference fits. The rotor fixing sleeve is a circular ring structure, and the first radial magnetic bearing, the second radial magnetic bearing, the first sensor, and the second sensor are all circular ring structures whose outer diameters are larger than the outer diameters of the rotor fixing sleeve.

10. The magnetic levitation motor rotor according to claim 9, characterized in that: An axial magnetic bearing is also sleeved on the second circumferential surface of the second core shaft, the axial magnetic bearing is interference fit with the second core shaft, and the axial magnetic bearing is attached to a side of the second sensor away from the first sensor; The outer circumference of the first core shaft is also provided with a speed sensor detection position for cooperating with the speed sensor detection.

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