CN118017740A - Ultra-high-speed permanent magnet motor for pure oil-free high-speed compressor and preparation process thereof - Google Patents
Ultra-high-speed permanent magnet motor for pure oil-free high-speed compressor and preparation process thereof Download PDFInfo
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Abstract
The invention discloses an ultra-high-speed permanent magnet motor for a pure oil-free high-speed compressor and a preparation process thereof. The motor comprises a motor shell, a front cover and a rear cover, wherein a motor shaft is arranged in the motor shell, a rotor is connected to the motor shaft, and a sheath is fixedly arranged outside the rotor; a stator is connected in the motor shell; the sheath is of a split structure, and a rotor force application structure is arranged in the sheath; the sheath comprises an inner sheath layer and an outer sheath layer; the rotor force application structure comprises an arc-shaped shell body which is arranged on the inner side wall of the outer sheath layer in a protruding mode, a sliding column and a sliding block which is arranged on one side of the sliding column are arranged in the arc-shaped shell body, an opening which is larger than the sliding block in size is formed in one end, close to the sliding block, of the arc-shaped shell body, and an elastic rubber ring which is smaller than the sliding block in size is arranged at the opening of the arc-shaped shell body. The preparation process comprises the following steps: winding the stator by using a machine after insulating treatment, and performing coil test after winding is completed to ensure the quality of motor winding; and assembling the stator and the motor shell, then loading sintered permanent magnet rotors on the motor shaft, and mounting the front cover and the rear cover at two ends of the motor shell.
Description
Technical Field
The invention relates to a motor, in particular to an ultra-high-speed permanent magnet motor for a pure oil-free high-speed compressor and a preparation process thereof.
Background
The original compressor is driven by a gear acceleration mode, gears, bearings and a lubrication system are needed, and mechanical friction is accompanied with the problems of great energy consumption, noise and the like. The pure oilless high-speed centrifugal compressor perfectly solves these problems, and has a plurality of core technologies: air suspension bearing, permanent magnet high-speed synchronous motor, frequency conversion system, high-strength aluminum alloy AL7075 (aviation aluminum) high-precision impeller processed by five shafts, remote intelligent monitoring service and the like. The pure oilless high-speed centrifugal compressor does not need a gearbox speed increaser and a coupling, and the impeller is directly connected with the motor and is directly driven by the high-speed motor. When the motor reaches a certain rotating speed, the shaft is suspended on the active air bearing controller, and the motor has the characteristics of high efficiency, energy conservation, low noise, reliable operation, long-term maintenance free and the like because of no physical contact and no need of a lubricating oil system. The ultra-high-speed permanent magnet motor used by the motor has very high centrifugal force of the rotor, so that the rotor is easy to damage, zhang Hongjie is mentioned in the paper ultra-high-speed permanent magnet motor design for hydrogen fuel cell air compressor published in the motor and control journal: when the ultra-high speed permanent magnet motor operates, the rotor generates huge centrifugal force, so that the tensile stress of the rotor is increased sharply. In order to ensure the normal operation of the motor, a sheath is assembled on the surface of the rotor to generate proper compressive stress so as to compensate the tensile stress of the surface of the permanent magnet, so that the tensile stress is within an allowable range, and the permanent magnet is prevented from being invalid. The prior art also indicates that the solid rotor has higher strength, can adopt a thinner sheath, and in addition, when adopting a carbon fiber sheath, the ultra-high-speed permanent magnet motor has minimum eddy current loss and minimum temperature, and meets the use requirement of a pure oil-free high-speed compressor. However, the tensile stress generated by the centrifugal force of rotor rotation is counteracted by the pressure brought by interference fit and is difficult to maintain after long-term use, and if the safety of the permanent magnet can be protected by increasing the thickness of the sheath, the heat dissipation of the rotor is not facilitated when a thick carbon fiber sheath with poor heat conductivity is adopted, the permanent magnet can be irreversibly demagnetized when the temperature of the rotor is too high, and the running reliability and the service life of the motor can not be ensured. Patent publication number CN112104118 a: the rotor core shaft is provided with a first end shaft at the front end and a second end shaft at the rear end; the rotor shaft center is made of high magnetic conductive material, the middle part is integrally provided with a plurality of accommodating grooves, and the accommodating grooves are uniformly arranged in the middle part outside the rotor shaft center in a circumference manner; the magnetic steel is embedded in the accommodating groove, the magnetic steel is arc-shaped, the inner side of the magnetic steel is tightly attached to the outer side of the rotor shaft center, and the magnetic steel is arranged on the outer surface of the accommodating groove in a segmented mode along the axial direction of the rotor core; the rotor core shaft is sleeved with a protective sleeve on the outer side, and the protective sleeve is provided with a shielding layer and a protective layer. The adjacent magnetic steels are fixedly connected through the sealing blocks, when the rotating speed of the motor is higher, the generated centrifugal force is reduced, but the solution thinking is that the centrifugal force is reduced by strengthening the strength or the firmness of an outer structure of a rotor (strengthening the connection strength of the outer magnetic steel of the rotor and the strength of an integral part formed by a plurality of magnetic steels), the method is similar to the mode of adopting a thick sheath in the prior art, the method wants to play a role in protecting enough permanent magnets, has certain requirements on the thickness of the magnetic steels, and needs better heat conducting performance for the thick magnetic steels, and has certain requirements on the components and the microstructure of the magnetic steels, such as aluminum base, copper base alloy, thermoelectric material and the like which have higher heat conducting coefficients, so the cost is improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the ultra-high-speed permanent magnet motor for the pure oil-free high-speed compressor, which adopts a sintered permanent magnet rotor, namely a solid rotor, so that the rotor has higher strength, can adopt a thinner sheath, has minimum eddy current loss and minimum temperature when being matched with a carbon fiber sheath, and meets the use requirement of the pure oil-free high-speed compressor. The rotor force application structure is arranged in the sheath, so that the tensile stress generated by the centrifugal force of the rotor rotation can be counteracted, the tensile stress of the rotor generated by the centrifugal force can be resisted by adopting the thin carbon fiber sheath, the safety of the permanent magnet is effectively protected, the heat dissipation of the rotor is not worried, the irreversible demagnetization of the permanent magnet caused by too much rise of the rotor temperature when the thick sheath is adopted can be avoided, and the running reliability and the service life of the motor are effectively ensured.
In order to achieve the above purpose, the technical scheme of the invention is to design an ultra-high speed permanent magnet motor for a pure oilless high-speed compressor, which comprises a motor shell, a front cover and a rear cover which are respectively connected with two ends of the motor shell, wherein a motor shaft is arranged in the middle position inside the motor shell and is rotationally connected to the motor shell, a sintered permanent magnet rotor is fixedly connected to the motor shaft, and a sheath is fixedly arranged outside the rotor; the inner wall of the motor shell is fixedly connected with a stator; the sheath is of a split structure, and a rotor force application structure is arranged in the sheath;
the sheath comprises an inner sheath layer and an outer sheath layer, and the inner sheath layer is fixedly connected outside the rotor; the outer sheath layer is fixedly connected to the motor shaft through connecting discs at two ends;
The rotor force application structure comprises an arc-shaped shell body which is arranged on the inner side wall of the outer sheath layer in a protruding mode, a sliding column and a sliding block which is arranged on one side of the sliding column are arranged in the arc-shaped shell body in a sliding mode, the length of the sliding column is larger than that of the sliding block, an opening which is larger than that of the sliding block in size is formed in one end, close to the sliding block, of the arc-shaped shell body, and an elastic rubber ring which is smaller than that of the sliding block in size is arranged at the opening of the arc-shaped shell body. The adoption of the form of sintering the permanent magnet rotor, namely the solid rotor, enables the rotor to have higher strength, can adopt a thinner sheath, and has the minimum eddy current loss and the minimum temperature of the ultra-high-speed permanent magnet motor when being matched with the carbon fiber sheath, thereby meeting the use requirement of the pure oil-free high-speed compressor. The rotor force application structure is arranged in the sheath, so that the tensile stress generated by the centrifugal force of the rotor rotation can be counteracted, the tensile stress of the rotor generated by the centrifugal force can be resisted by adopting the thin carbon fiber sheath, the safety of the permanent magnet is effectively protected, the heat dissipation of the rotor is not worried, the irreversible demagnetization of the permanent magnet caused by too much rise of the rotor temperature when the thick sheath is adopted can be avoided, and the running reliability and the service life of the motor are effectively ensured. The stator, the rotor and the motor shaft are concentrically arranged; the ultra-high-speed permanent magnet synchronous motor is directly coupled with the impeller for driving, so that a gear box is omitted, and transmission loss is completely eliminated; small volume, low noise, high insulation level H, high efficiency and energy saving. The protection grade can reach IP54, the application pressure range is 1-5 bar, the power range is 7.5-315 kw, the rotation speed range is 10000-100000 rpm, the highest rotation speed can reach 10 ten thousand revolutions per minute, and the high efficiency is more than 97%.
A space is arranged between the inner sheath layer and the outer sheath layer; the total thickness of the inner sheath layer and the outer sheath layer is equivalent to the sheath thickness of the solid rotor motor in the prior art; the inner sheath layer can be in interference fit with the rotor, and can also be in other conventional fixed connection modes; the inner side wall of the arc-shaped shell and the inner side wall of the outer sheath layer are fixed or integrally arranged, the length of the sliding block is smaller than that of the arc-shaped shell, but the width and the thickness of the sliding block are matched with those of the inner cavity of the arc-shaped shell, and therefore the sliding block can slide in the arc-shaped shell. The mass of the sliding column is larger than that of the sliding block. The elastic rubber ring is fixedly connected to the opening of the arc-shaped shell and used for blocking the sliding block from being separated from the arc-shaped shell. The two ends of the outer sheath layer are fixedly connected with the connecting disc, and the motor shaft penetrates through the center of the connecting disc and is fixedly connected with the connecting disc.
The elastic rubber ring is smaller than the sliding block in size and can move towards the center of the arc-shaped shell when the sliding column is subjected to centrifugal force, so that the sliding block is extruded (the sliding block is extruded by the sliding column because the centrifugal force is smaller than the sliding column), the size of the centrifugal force is related to the mass, the eccentricity and the rotating speed of the rotor, and the sliding column is larger than the sliding block in mass) so that the sliding block overcomes the resistance of the elastic rubber ring to the sliding block to a certain extent, and the sliding block extends from an opening of the inner ring of the elastic rubber ring to be abutted against the inner sheath layer to exert pressure on the inner sheath layer, so that the inner sheath layer can exert pressure on the sintered permanent magnet rotor to offset the stress generated by the centrifugal force of the high-speed rotation of the motor. Compared with the mode of canceling the stress generated by the centrifugal force of the motor rotating at a high speed only through the interference fit mode, the motor can still be maintained after long-term use, the interference fit state can also be maintained for a long time through the arrangement of the force application structure, the solid rotor is ensured to have higher strength, the thickness of the sheath is reduced due to the split arrangement of the inner ring and the outer ring of the sheath, heat dissipation is facilitated, too much temperature rise of the rotor is avoided, and the reliability and the service life of the motor are ensured.
The outer diameter (or outer ring) of the elastic rubber ring is consistent with the size of the opening; the inner diameter (or inner ring) of the elastomeric ring is smaller than the size of the slider. The end of the sliding block, which is close to the elastic rubber ring, can be provided in a stepped cylindrical shape or in a frustum shape so as to extend out of the opening of the inner ring of the elastic rubber ring.
The further technical proposal is that the inner sheath layer, the outer sheath layer, the sliding column and the sliding block are made of the same material; the center part of the arc-shaped shell is connected with the inner side wall of the outer sheath layer, and the two ends of the arc-shaped shell are spaced from the inner sheath layer. The two ends of the arc-shaped shell, namely the two ends closest to the inner sheath layer, are provided with a distance from the inner sheath layer, so that the sliding blocks can be prevented from contacting the inner sheath layer when the rotor does not rotate, and the sliding blocks are pressed against the inner sheath layer by the centrifugal force sliding columns to overcome the resistance of the elastic rubber rings when the rotor rotates, so that the force is applied to the sheath (the inner sheath layer in the application) by utilizing the centrifugal force to resist the tensile stress of the centrifugal force to the sintered permanent magnet rotor, and the safety of the permanent magnet is effectively protected.
The further technical scheme is that the inner sheath layer and the outer sheath layer are carbon fiber sheath layers, and the inner sheath layer and the outer sheath layer are annular;
one end of the motor shaft is fixedly connected with a disc, and blades are fixedly connected to the disc; the stator is provided with a plurality of winding groups; the motor shaft is rotatably connected to the motor casing through a bearing.
Further technical scheme is, the below of motor casing is integrative to be equipped with the supporting legs, sets up the screw hole on the supporting legs, and with screw hole adaptation be equipped with mounting bolt, the motor casing passes through mounting bolt fixed connection in the engine body of pure oilless high-speed compressor.
The further technical scheme is that a rotor heat dissipation structure is further arranged in the sheath. Thus, the problem of excessive temperature rise of the rotor caused by low heat conductivity of the carbon fiber sheath can be avoided.
The structure further realizes heat dissipation (although the thick sheath can protect the safety of the permanent magnet, the heat conductivity of the thick carbon fiber sheath is very low, so that the thick rotor sheath, especially the thick carbon fiber sheath, is unfavorable for the heat dissipation of the rotor), and the situation that the permanent magnet is irreversibly demagnetized due to too high temperature rise of the rotor is avoided, so that the running reliability and the service life of the motor are effectively ensured.
The invention also provides a technical scheme that the process for preparing the ultra-high-speed permanent magnet motor for the pure oil-free high-speed compressor comprises the following preparation steps in sequence:
s1: winding the stator by using a machine after insulating treatment, and performing coil test after winding is completed to ensure the quality of motor winding;
s2: and assembling the stator and the motor shell, then loading sintered permanent magnet rotors on the motor shaft, and mounting the front cover and the rear cover at two ends of the motor shell.
In the step S2, the inner sheath layer is fixedly arranged outside the rotor, the connecting disc is fixedly arranged on the motor shaft, the outer sheath layer is fixedly connected with the connecting disc, the disc is fixedly arranged at the end part of the motor shaft, and the blades are fixedly arranged on the disc; after dynamic balance test, the rotor is mounted on the motor shell through the bearing, and meanwhile, the stator and the motor shell are mounted together to form a complete ultra-high-speed permanent magnet motor.
The invention has the advantages and beneficial effects that: the adoption of the form of sintering the permanent magnet rotor, namely the solid rotor, enables the rotor to have higher strength, can adopt a thinner sheath, and has the minimum eddy current loss and the minimum temperature of the ultra-high-speed permanent magnet motor when being matched with the carbon fiber sheath, thereby meeting the use requirement of the pure oil-free high-speed compressor. The rotor force application structure is arranged in the sheath, so that the tensile stress generated by the centrifugal force of the rotor rotation can be counteracted, the tensile stress of the rotor generated by the centrifugal force can be resisted by adopting the thin carbon fiber sheath, the safety of the permanent magnet is effectively protected, the heat dissipation of the rotor is not worried, the irreversible demagnetization of the permanent magnet caused by too much rise of the rotor temperature when the thick sheath is adopted can be avoided, and the running reliability and the service life of the motor are effectively ensured.
The ultra-high-speed permanent magnet synchronous motor is directly coupled with the impeller for driving, so that a gear box is omitted, and transmission loss is completely eliminated; small volume, low noise, high insulation level H, high efficiency and energy saving. The protection grade can reach IP54, the application pressure range is 1-5 bar, the power range is 7.5-315 kw, the rotation speed range is 10000-100000 rpm, the highest rotation speed can reach 10 ten thousand revolutions per minute, and the high efficiency is more than 97%.
The elastic rubber ring is smaller than the sliding block in size and can move towards the center of the arc-shaped shell when the sliding column is subjected to centrifugal force, so that the sliding block is extruded (the sliding block is extruded by the sliding column because the centrifugal force is smaller than the sliding column), the size of the centrifugal force is related to the mass, the eccentricity and the rotating speed of the rotor, and the sliding column is larger than the sliding block in mass) so that the sliding block overcomes the resistance of the elastic rubber ring to the sliding block to a certain extent, and the sliding block extends from an opening of the inner ring of the elastic rubber ring to be abutted against the inner sheath layer to exert pressure on the inner sheath layer, so that the inner sheath layer can exert pressure on the sintered permanent magnet rotor to offset the stress generated by the centrifugal force of the high-speed rotation of the motor. Compared with the mode of canceling the stress generated by the centrifugal force of the motor rotating at a high speed only through the interference fit mode, the motor can still be maintained after long-term use, the interference fit state can also be maintained for a long time through the arrangement of the force application structure, the solid rotor is ensured to have higher strength, the thickness of the sheath is reduced due to the split arrangement of the inner ring and the outer ring of the sheath, heat dissipation is facilitated, too much temperature rise of the rotor is avoided, and the reliability and the service life of the motor are ensured.
The two ends of the arc-shaped shell, namely the two ends closest to the inner sheath layer, are provided with a distance from the inner sheath layer, so that the sliding blocks can be prevented from contacting the inner sheath layer when the rotor does not rotate, and the sliding blocks are pressed against the inner sheath layer by the centrifugal force sliding columns to overcome the resistance of the elastic rubber rings when the rotor rotates, so that the force is applied to the sheath (the inner sheath layer in the application) by utilizing the centrifugal force to resist the tensile stress of the centrifugal force to the sintered permanent magnet rotor, and the safety of the permanent magnet is effectively protected.
The rotor heat radiation structure further achieves heat radiation (although the thick sheath can protect the safety of the permanent magnet, the heat conductivity of the thick carbon fiber sheath is very low, so that the thick rotor sheath is unfavorable for the heat radiation of the rotor), the situation that the permanent magnet is irreversibly demagnetized due to too high temperature rise of the rotor is avoided, and the running reliability and the service life of the motor are effectively ensured.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an ultra-high speed permanent magnet motor for a pure oilless high speed compressor in accordance with the present invention;
FIG. 2 is a vertical section through the motor shaft rotation axis of FIG. 1;
FIG. 3 is an enlarged schematic view of portion B of FIG. 2;
FIG. 4 is a schematic illustration of the motor housing and front cover of FIG. 1 with the motor housing removed;
FIG. 5 is a vertical cross-sectional view of FIG. 1 perpendicular to the axis of rotation of the motor shaft;
FIG. 6 is an enlarged schematic view of portion A of FIG. 5;
FIG. 7 is an enlarged schematic view of the arcuate housing portion of FIG. 6;
FIG. 8 is an enlarged schematic view of portion D of FIG. 7;
FIG. 9 is a schematic view of the alternate operational state of FIG. 7;
FIG. 10 is a schematic view of an arc-shaped housing according to a second embodiment of the present invention;
FIG. 11 is an enlarged schematic view of portion C of FIG. 10;
FIG. 12 is a schematic view of an arcuate housing in accordance with a third embodiment of the invention;
FIG. 13 is an enlarged schematic view of portion E of FIG. 12;
Fig. 14 is a schematic view of an arc-shaped housing in a fourth embodiment of the invention.
In the figure: 1. a motor housing; 2. a front cover; 3. a rear cover; 4. a motor shaft; 5. a rotor; 6. a stator; 7. an inner sheath layer; 8. an outer sheath layer; 9. a connecting disc; 10. an arc-shaped housing; 11. a spool; 12. a slide block; 13. an elastic rubber ring; 14. a disc; 15. a blade; 16. a winding group; 17. a bearing; 18. supporting feet; 19. a cavity; 20. an opening; 21. ear-sucking ball; 22. a through hole; 23. and (3) a spring.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1 to 9, the invention relates to an ultra-high speed permanent magnet motor for a pure oil-free high-speed compressor, which consists of a motor shell 1, a front cover 2 and a rear cover 3 which are respectively connected with two ends of the motor shell 1, wherein a motor shaft 4 is arranged in the middle position inside the motor shell 1, the motor shaft 4 is rotationally connected to the motor shell 1, a sintered permanent magnet rotor 5 is fixedly connected to the motor shaft 4, and a sheath is fixedly arranged outside the rotor 5; the inner wall of the motor shell 1 is fixedly connected with a stator 6; the sheath is of a split structure, and a rotor force application structure is arranged in the sheath. The sheath comprises an inner sheath layer 7 and an outer sheath layer 8, and the inner sheath layer 7 is fixedly connected outside the rotor 5; the outer sheath layer 8 is fixedly connected to the motor shaft 4 through connecting discs 9 at two ends; the rotor force application structure comprises an arc-shaped shell 10 protruding from the inner side wall of the outer sheath layer 8, a slide column 11 and a slide block 12 positioned on one side of the slide column 11 are arranged in the arc-shaped shell 10 in a sliding mode, the length of the slide column 11 is larger than that of the slide block 12, an opening with the size larger than that of the slide block 12 is formed in one end, close to the slide block 12, of the arc-shaped shell 10, and an elastic rubber ring 13 with the size smaller than that of the slide block 12 is arranged at the opening of the arc-shaped shell 10. A space is arranged between the inner sheath layer 7 and the outer sheath layer 8; the total thickness of the inner sheath layer 7 and the outer sheath layer 8 is equivalent to the sheath thickness of the solid rotor motor in the prior art; the inner sheath layer 7 is in interference fit with the rotor 5, the arc-shaped shell 10 and the inner side wall of the outer sheath layer 8 are integrally arranged, the length of the sliding block 12 is smaller than that of the arc-shaped shell 10, but the width and the thickness of the sliding block 12 are matched with those of the inner cavity of the arc-shaped shell 10, and therefore the sliding block 12 can slide in the arc-shaped shell 10. The spool 11 is larger in mass than the slider 12. The elastic rubber ring 13 is fixedly connected to the opening of the arc-shaped shell 10 and used for blocking the sliding block 12 from being separated from the arc-shaped shell 10. The two ends of the outer sheath layer 8 are fixedly connected with the connecting disc 9, and the motor shaft 4 passes through the center of the connecting disc 9 and is fixedly connected with the connecting disc 9. The outer diameter (or outer ring) of the elastic rubber ring 13 is the same size as the opening of the arc-shaped housing 10; the inner diameter (or inner ring) of the elastomeric ring 13 is smaller than the size of the slider 12. The slider 12 has one end thereof close to the elastic rubber ring 13 arranged in a truncated cone shape so as to protrude from the opening of the inner ring of the elastic rubber ring 13. The inner sheath layer 7, the outer sheath layer 8, the sliding column 11 and the sliding block 12 are made of the same material; the center part of the arc-shaped shell 10 is connected with the inner side wall of the outer sheath layer 8, and the two ends of the arc-shaped shell 10 are spaced from the inner sheath layer 7. The inner sheath layer 7 and the outer sheath layer 8 are carbon fiber sheath layers, and the inner sheath layer 7 and the outer sheath layer 8 are annular; one end of the motor shaft 4 is fixedly connected with a disc 14, and blades 15 are fixedly connected on the disc 14; a plurality of winding groups 16 are arranged on the stator 6; the motor shaft 4 is rotatably connected to the motor housing 1 via a bearing 17. The below of motor casing 1 is integrative to be equipped with supporting legs 18, sets up the screw hole on the supporting legs 18, and with screw hole adaptation be equipped with mounting bolt, motor casing 1 passes through mounting bolt fixed connection in the body of pure oilless high-speed compressor. The rotor heat dissipation structure is further arranged in the sheath so as to avoid the problem of overhigh temperature rise of the rotor 5 caused by low heat conductivity of the carbon fiber sheath. The arc-shaped shell 10 is provided with a plurality of circles, each circle is arranged along the annular array of the inner side wall of the outer sheath layer 8, and the openings of the adjacent circles on the arc-shaped shell 10 on the same bus of the inner side wall of the outer sheath layer 8 are arranged in a staggered manner (for example, the openings of the first circle and the second circle on the two arc-shaped shells 10 on the same bus of the inner side wall of the outer sheath layer 8 are respectively arranged at the left end and the right end, so that the inner sheath layer 7 can be extruded uniformly from a plurality of points when being extruded by a plurality of sliding blocks 12). The sheath is arranged in an inner ring and an outer ring, an arc-shaped shell structure is arranged between the inner ring and the outer ring, the inner ring is tightly abutted against the inner ring after the centrifugal force is applied, and the inner ring sheath is formed to apply pressure to the sintered permanent magnet rotor so as to offset the stress generated by the centrifugal force of the high-speed rotation of the motor. After the motor is started, the motor shaft 4 rotates to drive the connecting disc 9 to rotate, the outer sheath layer 8 is driven to rotate, the inner sheath layer 7 is fixed with the motor shaft 4, so that the inner sheath layer 7 also rotates, the outer sheath layer 8 rotates to drive the arc-shaped shell 10 below the inner side wall of the arc-shaped shell 10 to rotate, the sliding column 11 and the sliding block 12 move towards the middle part of the arc-shaped shell 10 due to centrifugal force, the sliding column 11 basically covers the whole space in the arc-shaped shell 10 due to the fact that the sliding column 11 is large in size, and the sliding column 11 is larger than the sliding block 12 in size and is also heavier than the sliding block 12, so that the sliding block 12 is extruded by the sliding column 11 to move downwards (namely to the inner sheath layer) until the sliding block 12 abuts against the inner sheath layer 7, and the sliding block 12 overcomes the resistance of the elastic rubber ring 13 in the process. The sliding blocks 12 in the arc-shaped shells 10 are abutted against the inner sheath layer 7 to apply pressure to the inner sheath layer 7 (namely, apply pressure to the rotor) so as to counteract the stress generated by centrifugal force. The staggered arrangement of the openings of the adjacent circles on the arc-shaped shell 10 on the same bus on the inner side wall of the outer sheath layer 8 can ensure that the inner sheath layer 7 is applied from a plurality of points when being extruded by a plurality of sliding blocks 12, so that the inner sheath layer 7 is uniformly extruded.
The process for preparing the ultra-high speed permanent magnet motor for the pure oil-free high-speed compressor comprises the following preparation steps in sequence:
S1: winding the stator 6 by using a machine after insulating treatment, and performing a coil test after winding is completed so as to ensure the quality of motor winding;
s2: assembling a stator 6 and a motor shell 1, then loading a sintered permanent magnet rotor 5 on a motor shaft 4, and mounting a front cover 2 and a rear cover 3 on two ends of the motor shell 1;
S3: the motor shell 1 is fixedly connected in the body of the pure oilless high-speed compressor through the mounting bolts.
In the step S2, the inner sheath layer 7 is fixedly arranged outside the rotor 5, the connecting disc 9 is fixedly arranged on the motor shaft 4, the outer sheath layer 8 is fixedly connected with the connecting disc 9, the disc 14 is fixedly arranged at the end part of the motor shaft 4, and the blades 15 are fixedly arranged on the disc 14; after dynamic balance test, the rotor 5 is mounted on the motor casing 1 through the bearing 17, and meanwhile, the stator 6 and the motor casing 1 are mounted together to form a complete ultra-high-speed permanent magnet motor.
Example two
Unlike the first embodiment, as shown in fig. 10 and 11, the rotor heat dissipation structure includes a cavity 19 provided on the inner wall of the elastic rubber ring 13, and an opening 20 communicating with the cavity 19 is provided on the side of the elastic rubber ring 13 facing the inner jacket layer, so that the elastic rubber ring 13 forms a rubber air-blowing ball, when the rotor force application structure acts due to centrifugal force (i.e., the strut 11 is subjected to centrifugal force, the rotor force application structure moves toward the center of the arc-shaped housing 10, thereby pressing the slider 12 to overcome the resistance of the elastic rubber ring 13 to the slider 12 to a certain extent, the slider 12 protrudes from the opening of the inner ring of the elastic rubber ring 13 to abut against the inner jacket layer, and plays a role in pressing the inner jacket layer, because the slider 12 presses the elastic rubber ring 13 when the slider 12 is pressed by the strut 11 (the cavity 19 of the inner wall of the elastic rubber ring 13 is pressed, air flows out from the opening 20) and corresponds to the rubber air-blowing ball being pressed, and the rubber air-blowing ball is pressed, thereby playing a role in directly dissipating heat of the inner jacket layer of the rotor outer surface in this process. The prior art generally adopts a stator water cooling and rotor ventilation mode, and the technical scheme of the application can be combined with the existing rotor ventilation mode in the prior art to further strengthen the heat dissipation effect, or can replace the rotor ventilation mode in the prior art to a certain extent.
Example III
Unlike the second embodiment, as shown in fig. 12 and 13, the rotor heat dissipation structure further includes an ear-sucking ball 21 (or rubber blowing ball, ear-washing ball) disposed at an end of the arc-shaped housing near the sliding post 11 (i.e., the end of the arc-shaped housing where the opening 20 is not disposed), the ear-sucking ball 21 is disposed at an end of the arc-shaped housing 10 far from the opening 20, a spherical housing portion of the ear-sucking ball 21 is disposed in the arc-shaped housing 10, a tubular portion of the ear-sucking ball 21 extends out of the arc-shaped housing 10 after passing through the end of the arc-shaped housing 10, and is disposed toward the inner jacket layer, and a through hole 22 for passing through the tubular portion of the ear-sucking ball 21 is disposed at an end of the arc-shaped housing far from the opening 20. When the rotor is not rotated, the sliding column 11 is pressed on the lug sucking ball 21 due to self weight, the sliding column 11 is far away from the lug sucking ball 21 after the rotor rotates (the sliding column 11 moves towards the middle part of the arc-shaped shell 10 because the sliding column 11 is subjected to centrifugal force), so that the lug sucking ball is not pressed, and the air sucking action is formed, so that part of heat generated by the rotor (including heat transferred to an inner sheath layer) can be sucked away, the air blowing action of the structure of the cavity 19 arranged on the inner wall of the elastic rubber ring 13 at the opening of the arc-shaped shell is matched, the heat dissipation of the rotor can be greatly enhanced by matching with the existing rotor ventilation mode, and the situation of irreversible demagnetization of a permanent magnet caused by too high temperature rise of the rotor is prevented. While the hollow space 19 provided on the inner wall of the elastic rubber ring 13 cannot be pressed basically (or only to a small extent) due to the small mass of the slider 12 when the rotor is not rotating, the hollow space 19 provided on the inner wall of the elastic rubber ring 13 is pressed to a large extent due to the pressing of the slide post 11 when the rotor is rotating, forming air blowing. That is, when the rotor rotates, the end of the arc-shaped shell, which is provided with the opening 20, blows air, and the end of the ear suction ball 21 of the arc-shaped shell 10 sucks air; when the rotor is decelerated until no rotation is performed, the end of the arc-shaped housing 10 provided with the opening 20 is sucked (because the cavity 19 provided on the inner wall of the ring of the elastic rubber ring 13 is hardly compressed or is compressed only to a small extent, compared with the state of being compressed before, the cavity 19 is expanded to a certain extent, the cavity 19 is relaxed), and the end of the arc-shaped housing suction ball 21 is blown (because the centrifugal force applied to the slide column 11 is reduced, the slide column 11 moves to the initial position, and the suction ball 21 is compressed again), so that both processes realize blowing and sucking for a certain period of time, and the heat dissipation of the rotor and the jacket outside the rotor (mainly the inner jacket layer close to the rotor here) is enhanced in cooperation with the ventilation mode of the rotor existing in the prior art.
Example IV
Unlike the second embodiment, as shown in fig. 14, one end of the sliding column 11 far from the opening is fixedly connected with the spring 23, and the other end of the spring 23 is connected with the arc-shaped casing 10, so that when the rotor rotates, the sliding column 11 moves towards the middle of the arc-shaped casing 10 due to centrifugal force to form the effect of pressing the sliding block 12, and a part of the sliding block 12 stretches out of the end of the arc-shaped casing 10, in the process, the cavity in the elastic rubber ring 13 is pressed to blow air to the inner sheath layer, and in the moving process, the sliding column moves back slightly (at the moment, the cavity is properly relaxed and expanded to form the action of sucking air), so that balance is achieved after the process is repeated for several times, and in the repeated process, the cavity blows air for a while sucking air, the duration of the blowing and the heat dissipation effect of the inner sheath layer is longer, and the better heat dissipation effect is achieved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (7)
1. The ultra-high speed permanent magnet motor for the pure oilless high-speed compressor is characterized by comprising a motor shell, a front cover and a rear cover which are respectively connected with two ends of the motor shell, wherein a motor shaft is arranged in the middle of the inside of the motor shell and is rotationally connected to the motor shell, a sintered permanent magnet rotor is fixedly connected to the motor shaft, and a sheath is fixedly arranged outside the rotor; the inner wall of the motor shell is fixedly connected with a stator; the sheath is of a split structure, and a rotor force application structure is arranged in the sheath;
the sheath comprises an inner sheath layer and an outer sheath layer, and the inner sheath layer is fixedly connected outside the rotor; the outer sheath layer is fixedly connected to the motor shaft through connecting discs at two ends;
The rotor force application structure comprises an arc-shaped shell body which is arranged on the inner side wall of the outer sheath layer in a protruding mode, a sliding column and a sliding block which is arranged on one side of the sliding column are arranged in the arc-shaped shell body in a sliding mode, the length of the sliding column is larger than that of the sliding block, an opening which is larger than that of the sliding block in size is formed in one end, close to the sliding block, of the arc-shaped shell body, and an elastic rubber ring which is smaller than that of the sliding block in size is arranged at the opening of the arc-shaped shell body.
2. The ultra-high-speed permanent magnet motor for the pure oil-free high-speed compressor of claim 1, wherein the inner sheath layer, the outer sheath layer, the sliding column and the sliding block are made of the same material; the center part of the arc-shaped shell is connected with the inner side wall of the outer sheath layer, and the two ends of the arc-shaped shell are spaced from the inner sheath layer.
3. The ultra-high-speed permanent magnet motor for a pure oilless high-speed compressor according to claim 2, wherein the inner sheath layer and the outer sheath layer are both carbon fiber sheath layers, and are annular;
one end of the motor shaft is fixedly connected with a disc, and blades are fixedly connected to the disc; the stator is provided with a plurality of winding groups; the motor shaft is rotatably connected to the motor casing through a bearing.
4. The ultra-high-speed permanent magnet motor for the pure oilless high-speed compressor according to claim 3, wherein supporting legs are integrally arranged below the motor casing, threaded holes are formed in the supporting legs, mounting bolts are matched with the threaded holes, and the motor casing is fixedly connected in the body of the pure oilless high-speed compressor through the mounting bolts.
5. The ultra-high speed permanent magnet motor for pure oilless high speed compressor as defined in claim 1 or 4, wherein a rotor heat dissipation structure is further disposed in said sheath.
6. A process for preparing the ultra-high-speed permanent magnet motor for the pure oil-free high-speed compressor according to claim 5, which is characterized by comprising the following preparation steps carried out in sequence:
s1: winding the stator by using a machine after insulating treatment, and performing coil test after winding is completed to ensure the quality of motor winding;
s2: and assembling the stator and the motor shell, then loading sintered permanent magnet rotors on the motor shaft, and mounting the front cover and the rear cover at two ends of the motor shell.
7. The process according to claim 6, wherein in the step S2, the inner sheath is fixedly installed outside the rotor, the outer sheath is fixedly connected with the connection disc after the connection disc is fixedly installed on the motor shaft, the disc is fixedly installed at the end of the motor shaft, and the blades are fixedly installed on the disc; after dynamic balance test, the rotor is mounted on the motor shell through the bearing, and meanwhile, the stator and the motor shell are mounted together to form a complete ultra-high-speed permanent magnet motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410420682.5A CN118017740A (en) | 2024-04-09 | 2024-04-09 | Ultra-high-speed permanent magnet motor for pure oil-free high-speed compressor and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410420682.5A CN118017740A (en) | 2024-04-09 | 2024-04-09 | Ultra-high-speed permanent magnet motor for pure oil-free high-speed compressor and preparation process thereof |
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| Publication Number | Publication Date |
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| CN118017740A true CN118017740A (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410420682.5A Pending CN118017740A (en) | 2024-04-09 | 2024-04-09 | Ultra-high-speed permanent magnet motor for pure oil-free high-speed compressor and preparation process thereof |
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| Country | Link |
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| CN (1) | CN118017740A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812247A (en) * | 2013-10-30 | 2014-05-21 | 南京航空航天大学 | High-speed permanent magnet motor rotor with double-layer sheath structure |
| CN107612166A (en) * | 2017-09-22 | 2018-01-19 | 沈端劼 | A kind of rotor with stacked protective metal shell |
| US20210257884A1 (en) * | 2018-11-07 | 2021-08-19 | Gree Electric Appliances, Inc. Of Zhuhai | Motor Rotor and Permanent Magnet Motor |
| CN113364182A (en) * | 2021-07-08 | 2021-09-07 | 珠海格力电器股份有限公司 | Rotor sheath, rotor subassembly, motor, compressor |
-
2024
- 2024-04-09 CN CN202410420682.5A patent/CN118017740A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812247A (en) * | 2013-10-30 | 2014-05-21 | 南京航空航天大学 | High-speed permanent magnet motor rotor with double-layer sheath structure |
| CN107612166A (en) * | 2017-09-22 | 2018-01-19 | 沈端劼 | A kind of rotor with stacked protective metal shell |
| US20210257884A1 (en) * | 2018-11-07 | 2021-08-19 | Gree Electric Appliances, Inc. Of Zhuhai | Motor Rotor and Permanent Magnet Motor |
| CN113364182A (en) * | 2021-07-08 | 2021-09-07 | 珠海格力电器股份有限公司 | Rotor sheath, rotor subassembly, motor, compressor |
Non-Patent Citations (1)
| Title |
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| 佟文明等: "双层复合护套高速永磁电机转子涡流损耗解析模型", 电工技术学报, 22 August 2023 (2023-08-22), pages 1 - 13 * |
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