Overall magnetizing magnetic suspension high-speed permanent magnet motor rotor structure and assembling method

Abstract

The invention belongs to the field of permanent magnet motors, and particularly relates to an integral magnetizing magnetic suspension high-speed permanent magnet motor rotor structure and an assembling method, and the integral magnetizing magnetic suspension high-speed permanent magnet motor rotor structure comprises a rotating shaft, an annular permanent magnet, a spacer bush, a thrust disc and an iron core part, the annular permanent magnet is arranged on the rotating shaft in a sleeving mode, the end of the annular permanent magnet is connected with one side of the positioning step table in an abutting mode, the spacer bush is arranged on the rotating shaft in a sleeving mode, and the end of the spacer bush is connected with the end, away from the positioning step table, of the annular permanent magnet in an abutting mode. The thrust disc is arranged on the rotating shaft in a sleeving mode and located on the side, away from the annular permanent magnet, of the positioning step table, and the iron core parts are arranged at the two ends of the rotating shaft in a sleeving mode and connected with the spacer bush and the thrust disc in an abutting mode respectively. The device has the advantages of being easy to assemble, free of disassembly for magnetizing, high in magnetizing efficiency, good in general applicability and the like.

Description

Technical Field

[0001] The invention relates to the field of permanent magnet motors, and in particular to an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor structure and an assembly method. Background Art

[0002] At present, the magnetization methods of permanent magnet motors are generally divided into three methods according to the magnetization and assembly process: magnetization before assembly, magnetization for partial assembly and magnetization after assembly.

[0003] For small, low-power permanent magnet motors, it is very convenient to use traditional pre-assembly magnetization. However, as the motor power increases, the magnets after pre-assembly magnetization will generate very large forces with the rotor and between different magnets, and will absorb ferromagnetic materials such as iron filings during the assembly process, which will be brought into the motor and have adverse effects on the operation of the motor.

[0004] The difficulty of assembly caused by the pre-assembly magnetization method after magnetization makes it unsuitable for large and medium-sized permanent magnet motors. The traditional partial assembly magnetization method, due to the various changes in the structure, permanent magnet placement and shape of the permanent magnet motor, and the magnetization magnetic field direction generated by the magnetization equipment needs to be consistent with the magnetization direction of the permanent magnet, so permanent magnet motors with different motor structures, permanent magnet placement and shapes require different magnetization equipment, which greatly increases the manufacturing cost of permanent magnet motors. The overall magnetization method after assembly can solve the above problems relatively perfectly.

[0005] Therefore, in order to solve the above problems, a rotor structure and assembly method of an integrally magnetized magnetically suspended high-speed permanent magnet motor are specifically proposed. Summary of the invention

[0006] The present invention is aimed at the above-mentioned problems and specifically designs an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor structure and an assembly method. The device has the advantages of easy assembly, magnetization without disassembly, high magnetization efficiency, and good universal applicability.

[0007] To achieve the above-mentioned purpose, the present invention provides an integrally magnetized magnetic levitation high-speed permanent magnet motor rotor structure, comprising: a rotating shaft, an annular permanent magnet, a spacer sleeve, a thrust plate and an iron core portion, wherein a positioning step is provided on the rotating shaft, the annular permanent magnet is sleeved on the rotating shaft and the end portion is abutted and connected with one side of the positioning step, the spacer sleeve is sleeved on the rotating shaft, the end portion of the spacer sleeve is abutted and connected with one end of the annular permanent magnet away from the positioning step, the thrust plate is sleeved on the rotating shaft and is located on the side of the positioning step away from the annular permanent magnet, and the iron core portion is sleeved on both ends of the rotating shaft and is respectively abutted and connected with the spacer sleeve and the thrust plate.

[0008] Through the above method, the annular permanent magnet structure is adopted, which can effectively resist the shear stress generated when the rotor runs at high speed, and greatly improve the rotor assembly efficiency; the thrust plate adopts a split design, which can effectively improve the utilization rate of alloy materials and reduce production costs; Furthermore, the core portion includes: a locking ring, a magnetic bearing rotor core and a gasket, which are arranged in sequence from the middle of the rotating shaft toward both ends, and the gaskets on both sides are respectively connected to the spacer and the thrust plate, and the locking ring, the magnetic bearing rotor core and the gasket are an integrated structure.

[0009] In the above manner, the backing ring, the magnetic bearing rotor core and the locking ring are pressed together by using a special tool, the inner hole is processed, and then the whole is heated and assembled on the rotating shaft; the overall processing method is adopted, firstly, the silicon steel sheet of the magnetic bearing rotor core can be pressed; secondly, the coaxiality requirements of the three can be effectively guaranteed, so that each part hot-mounted on the rotating shaft has a certain preload requirement; Furthermore, it also includes a sleeve, which is sleeved on the annular permanent magnet, and an end of the sleeve is in contact with the positioning step platform.

[0010] In the above manner, the sheath is fixed on the outside, which has a fixing effect on the annular permanent magnet and prevents the deformation of the annular permanent magnet caused by centrifugal force. The permanent magnets on the rotor of a high-speed permanent magnet motor are difficult to withstand the huge centrifugal force generated by the high-speed rotation of the rotor. Therefore, special protection measures must be taken for the permanent magnets on the motor rotor. By using the non-magnetic metal sheath thermal assembly method to apply a certain pre-tightening force to the annular permanent magnet, the deformation caused by the centrifugal force during high-speed rotation can be effectively compensated. Furthermore, it comprises detection rings, wherein there are two detection rings, and both ends of the rotating shaft are sleeved with the detection rings.

[0011] Through the above method, the detection ring design can effectively detect the change of the rotor position during the operation of the magnetic suspension high-speed permanent magnet motor, providing a basis for the magnetic bearing to adjust the rotor position; Furthermore, the contact point between the spacer and the annular permanent magnet is located below the sheath.

[0012] Furthermore, the sheath is made of non-magnetic metal material.

[0013] The present invention also provides a method for assembling a rotor of an integrally magnetized magnetically suspended high-speed permanent magnet motor, comprising the following steps: Step 1: Heat the unmagnetized annular permanent magnet and then assemble it on the rotating shaft; Step 2: heating the spacer sleeve and then assembling it onto the rotating shaft, and making the cross section of the spacer sleeve close to the annular permanent magnet; Step 3: heating the sleeve and then assembling it on the rotating shaft, wherein the axial direction of the sleeve is positioned by the positioning step of the rotating shaft; Step 4: Assemble the thrust plate on the rotating shaft by interference fit and heating and locate it on the other side of the positioning step platform; Step 5: Use a tool to press the backing ring, the magnetic bearing rotor core and the locking ring into a whole, heat the whole and assemble it on the rotating shaft; Step 6: heating the detection ring and assembling it on both ends of the rotating shaft; Step 7: Process the assembled rotor as a whole to ensure coaxiality; Step 8: Magnetize the rotor using the overall magnetization method.

[0014] Compared with other magnetizing methods, the overall magnetizing method can maximize the efficiency of permanent magnets and improve the overall performance of the motor. The overall magnetizing method also avoids the adverse effects of magnetic attraction during the assembly of permanent magnets, as well as the adverse effects of ferromagnetic materials adsorbed during the assembly process and entering the motor's interior on the motor's operation.

[0015] Furthermore, in the step 2, after the spacer is assembled, when the temperature of the spacer drops to 20° C.-25° C., the outer diameters of the annular permanent magnet and the spacer are processed to ensure coaxiality.

[0016] Furthermore, in step five, after the gasket, magnetic bearing rotor core and locking ring are pressed together, the inner hole of the whole after press-fitting needs to be processed to ensure coaxiality.

[0017] Furthermore, structural adhesive is applied to the inner ring of the annular permanent magnet, and then the annular permanent magnet is assembled on the rotating shaft.

[0018] In summary, the integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure and assembly method of the present invention have the following advantages and beneficial technical effects: 1. The present invention discloses an assembly method for an integrally magnetized magnetic suspension high-speed permanent magnet motor rotor. The magnetic suspension high-speed permanent magnet motor rotor is integrally magnetized, and has the advantages of high magnetization efficiency, easy assembly, and re-magnetization without disassembly. 2. The present invention provides an assembly method for an integrally magnetized magnetic suspension high-speed permanent magnet motor rotor based on the integral magnetization technology, which can not only quickly improve the assembly and magnetization efficiency of the permanent magnet, but also significantly reduce the assembly difficulty, improve the assembly accuracy, and especially ensure the safety during the assembly process. Compared with other magnetization methods, the integral magnetization method can maximize the efficiency of the permanent magnet and improve the overall performance of the motor; the integral magnetization also avoids the adverse effects of magnetic attraction during the assembly of the permanent magnet, as well as the adverse effects of ferromagnetic substances adsorbed during the assembly process and entering the motor interior on the operation of the motor; 3. The assembly method of the integrally magnetized magnetic suspension high-speed permanent magnet motor rotor of the present invention can solve the large-scale automated production of magnetic suspension high-speed permanent magnet motor rotors, and can also simplify the operation process of workers, reduce the technical requirements of workers, and save labor; 4. The rotor structure of the integrally magnetized magnetic suspension high-speed permanent magnet motor of the present invention is provided with a sheath on the outside of the annular permanent magnet, which can prevent the influence of centrifugal force on the deformation of the annular permanent magnet; 5. The detection ring in the rotor structure of the integrally magnetized magnetic suspension high-speed permanent magnet motor of the present invention can effectively detect the change of the rotor position during the operation of the magnetic suspension high-speed permanent magnet motor, and provide a basis for the magnetic bearing to adjust the rotor position; 6. The present invention provides an assembly method for an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor, in which the core part is heated and assembled on the rotating shaft as a whole; the integral processing method is adopted, firstly, the silicon steel sheets of the magnetic bearing rotor core can be compressed; secondly, the coaxiality requirements of the three can be effectively guaranteed, so that each component hot-mounted on the rotating shaft has a certain pre-tightening force requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a structural schematic diagram of an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor structure of the present invention.

[0020] Figure 2 It is a cross-sectional view of the side structure of an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor structure of the present invention.

[0021] The reference numerals in the accompanying drawings are: 1. Rotating shaft; 11. Positioning step; 2. Detection ring; 3. Locking ring; 4. Magnetic bearing rotor core; 5. Backing ring; 6. Spacer; 7. Sheath; 8. Thrust plate; 9. Ring-shaped permanent magnet. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions; the described embodiments are part of the embodiments of the present invention, not all of the embodiments; the embodiments described below with reference to the drawings and directional terms are exemplary and are intended to be used to explain the present invention, and cannot be understood as limitations on the present invention; based on the embodiments in 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. The parts and equipment all adopt conventional models in the prior art, and the circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. The embodiments of the present invention are described in detail below in conjunction with the drawings: like Figure 1 and Figure 2 As shown, an integrally magnetized magnetically suspended high-speed permanent magnet motor rotor structure comprises: a rotating shaft 1, an annular permanent magnet 9, a spacer sleeve 6, a thrust plate 8 and an iron core portion, a positioning step platform 11 is provided on the rotating shaft 1, and the positioning step platform 11 is an annular structure opened on the outer surface of the rotating shaft 1, the annular permanent magnet 9 is sleeved on the rotating shaft 1 after heating, and the end thereof is in abutment with one side of the positioning step platform 11, and the annular permanent magnet 9 is fixed there by the positioning effect of the positioning step platform 11, the spacer sleeve 6 is sleeved on the rotating shaft 1 after heating, and the end thereof is in abutment with one end of the annular permanent magnet 9 away from the positioning step platform 11, the thrust plate 8 is sleeved on the rotating shaft 1 after heating and is located on the side of the positioning step platform 11 away from the annular permanent magnet 9, and the iron core portion is sleeved on both ends of the rotating shaft 1 after heating, and is in abutment with the spacer sleeve 6 and the thrust plate 8 respectively.

[0023] It also includes a detection ring 2, there are two detection rings 2, both ends of the shaft 1 are sleeved with detection rings 2, the detection ring 2 is located at the end of the shaft 1, and the side of the detection ring 2 away from the end of the shaft 1 is the iron core. The annular permanent magnet structure can effectively resist the shear stress generated when the rotor runs at high speed, and greatly improve the rotor assembly efficiency; the thrust plate 8 adopts a split design, which can effectively improve the utilization rate of alloy materials and reduce production costs; The components sleeved on the outer side of the rotating shaft 1 are all installed by assembling after heating.

[0024] like Figure 1As shown, the core part includes: a locking ring 3, a magnetic bearing rotor core 4 and a gasket 5. The gasket 5, the magnetic bearing rotor core 4 and the locking ring 3 are arranged in sequence from the middle of the rotating shaft 1 to the two ends. Before installation, the locking ring 3, the magnetic bearing rotor core 4 and the gasket 5 are first pressed into a whole by tooling, and then assembled to the two ends of the rotating shaft 1 after heating. Before assembly, the inner hole diameter of the whole needs to be processed so that the diameter meets the assembly requirements and ensures coaxiality. The gaskets 5 on both sides are respectively connected with the spacer 6 and the thrust plate 8. The structure of the locking ring 3, the magnetic bearing rotor core 4 and the gasket 5 is an integrated structure pressed by tooling.

[0025] like Figure 1 As shown, it also includes a sleeve 7, which is sleeved on the annular permanent magnet 9 after heating, and the end of the sleeve is in contact with the positioning step 11. The sleeve 7 is fixed to the outside, which has a fixing effect on the annular permanent magnet 9 and prevents the deformation of the annular permanent magnet 9 due to the centrifugal force; the permanent magnets on the rotor of a high-speed permanent magnet motor are difficult to withstand the huge centrifugal force generated by the high-speed rotation of the rotor. Therefore, special protection measures must be taken for the permanent magnets on the motor rotor. The sleeve 7 is made of non-magnetic metal material and is installed by thermal assembly. A certain pre-tightening force is applied to the annular permanent magnet 9, which can effectively compensate for the deformation caused by the centrifugal force during high-speed rotation; like Figure 1 As shown, the contact point between the spacer sleeve 6 and the annular permanent magnet 9 is located below the sheath 7. The sheath 7 completely covers the annular permanent magnet 9 below.

[0026] The present invention provides an assembly method for an integrally magnetized magnetic suspension high-speed permanent magnet motor rotor, comprising the following steps: Step 1: Heat the unmagnetized annular permanent magnet 9 and then assemble it on the rotating shaft 1; and make the annular permanent magnet 9 close to the positioning step platform 11; Step 2: Heat the spacer 6 and then assemble it onto the rotating shaft 1, and make the cross section of the spacer 6 close to the side of the annular permanent magnet 9 away from the positioning step 11; Step 3: Heat the sleeve 7 and then assemble it on the shaft 1. The axial direction of the sleeve 7 is positioned by the positioning step 11 of the shaft 1, so that the end of the sleeve 7 exceeds the junction of the spacer 6 and the annular permanent magnet 9; Step 4: Assemble the thrust plate 8 on the rotating shaft 1 by interference fit and heating and place it on the other side of the positioning step platform 11; the thrust plate 8 adopts a split design, which can effectively improve the utilization rate of alloy materials and reduce production costs; Step 5: Use a tool to press the backing ring 5, the magnetic bearing rotor core 4 and the locking ring 3 into a whole, heat the whole and assemble it on the rotating shaft 1; Step 6: Heat the detection ring 2 and assemble it on both ends of the rotating shaft 1; Step 7: Process the assembled rotor as a whole to ensure coaxiality; Step 8: Use the overall magnetization method to magnetize the rotor. Compared with other magnetization methods, the overall magnetization method can maximize the efficiency of permanent magnets and improve the overall performance of the motor; overall magnetization also avoids the adverse effects of magnetic attraction during the assembly of permanent magnets, as well as the adverse effects of ferromagnetic materials adsorbed during the assembly process and entering the motor's interior on the motor's operation.

[0027] In step 2, after the spacer 6 is assembled, when the temperature of the spacer 6 drops to 22° C., the outer diameters of the annular permanent magnet 9 and the spacer 6 are processed to ensure coaxiality.

[0028] In step five, after the backing ring 5, the magnetic bearing rotor core 4 and the locking ring 3 are press-fitted together, the inner hole of the press-fitted whole needs to be processed to ensure coaxiality.

[0029] Structural adhesive is applied to the inner ring of the annular permanent magnet 9 , and then the annular permanent magnet 9 is assembled on the rotating shaft 1 .

[0030] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure, characterized in that: include: A rotating shaft (1), an annular permanent magnet (9), a spacer sleeve (6), a thrust plate (8) and an iron core portion, wherein a positioning step platform (11) is arranged on the rotating shaft (1), the annular permanent magnet (9) is sleeved on the rotating shaft (1) and an end portion thereof is in contact with one side of the positioning step platform (11), the spacer sleeve (6) is sleeved on the rotating shaft (1), an end portion of the spacer sleeve (6) is in contact with one end of the annular permanent magnet (9) away from the positioning step platform (11), the thrust plate (8) is sleeved on the rotating shaft (1) and is located on a side of the positioning step platform (11) away from the annular permanent magnet (9), and the iron core portion is sleeved on both ends of the rotating shaft (1) and is in contact with the spacer sleeve (6) and the thrust plate (8) respectively.

2. The integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure according to claim 1 is characterized in that: The core portion comprises: a locking ring (3), a magnetic bearing rotor core (4) and a gasket (5), wherein the gasket (5), the magnetic bearing rotor core (4) and the locking ring (3) are arranged in sequence from the middle of the rotating shaft (1) towards both ends, and the gaskets (5) on both sides are respectively abutted against the spacer (6) and the thrust plate (8), and the locking ring (3), the magnetic bearing rotor core (4) and the gasket (5) are an integrated structure.

3. The integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure according to claim 1 is characterized in that: It also comprises a sleeve (7), wherein the sleeve (7) is sleeved on the annular permanent magnet (9), and an end portion of the sleeve is in contact with the positioning step platform (11).

4. The integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure according to claim 1 is characterized in that: It comprises a detection ring (2), wherein there are two detection rings (2), and both ends of the rotating shaft (1) are sleeved with the detection ring (2).

5. The integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure according to claim 3 is characterized in that: The contact point between the spacer sleeve (6) and the annular permanent magnet (9) is located below the protective sleeve (7).

6. The integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure according to claim 3 is characterized in that: The sheath (7) is made of a non-magnetic metal material.

7. A method for assembling a rotor of an integrally magnetized magnetically suspended high-speed permanent magnet motor, characterized in that: Assembling the integrally magnetized magnetic suspension high-speed permanent magnet motor rotor structure described in claim 1 comprises the following steps: Step 1: heating the unmagnetized annular permanent magnet (9) and then assembling it on the rotating shaft (1); Step 2: heating the spacer sleeve (6) and then assembling it onto the rotating shaft (1), and making the cross section of the spacer sleeve (6) closely contact the annular permanent magnet (9); Step three: heating the sleeve (7) and then assembling it on the rotating shaft (1), wherein the axial direction of the sleeve (7) is positioned by a positioning step (11) of the rotating shaft (1); Step 4: Assemble the thrust plate (8) on the rotating shaft (1) and locate it on the other side of the positioning step platform (11) by means of interference fit and heating; Step 5: using a tool to press the backing ring (5), the magnetic bearing rotor core (4) and the locking ring (3) into a whole, heating the whole and assembling it on the rotating shaft (1); Step 6: heating the detection ring (2) and assembling it on both ends of the rotating shaft (1); Step 7: Process the assembled rotor as a whole to ensure coaxiality; Step 8: Magnetize the rotor using the overall magnetization method.

8. The method for assembling a rotor of an integrally magnetized magnetically suspended high-speed permanent magnet motor according to claim 7, characterized in that: In the second step, after the spacer (6) is assembled, when the temperature of the spacer (6) drops to 20°C-25°C, the outer diameters of the annular permanent magnet (9) and the spacer (6) are processed to ensure coaxiality.

9. The method for assembling a rotor of an integrally magnetized magnetically suspended high-speed permanent magnet motor according to claim 7, characterized in that: In step five, after the backing ring (5), the magnetic bearing rotor core (4) and the locking ring (3) are pressed together, the inner hole of the pressed whole needs to be processed to ensure coaxiality.

10. The method for assembling a rotor of an integrally magnetized magnetically suspended high-speed permanent magnet motor according to claim 7, characterized in that: In the step one, structural glue is applied to the inner ring of the annular permanent magnet (9), and then the annular permanent magnet (9) is assembled on the rotating shaft (1).

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