CN217769645U - Powder metallurgy iron core rotor for compressor - Google Patents
Powder metallurgy iron core rotor for compressor Download PDFInfo
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- CN217769645U CN217769645U CN202221297255.5U CN202221297255U CN217769645U CN 217769645 U CN217769645 U CN 217769645U CN 202221297255 U CN202221297255 U CN 202221297255U CN 217769645 U CN217769645 U CN 217769645U
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Abstract
The utility model discloses a powder metallurgy iron core rotor for compressor, including setting up at the rotor core of center department and setting up the magnet steel group in the rotor core outside, magnet steel group and rotor core fixed connection. The structure of the segmented skewed pole magnetic steel is attached to the surface of the integrally formed powder metallurgy rotor core, the segmented skewed pole structure of the rotor is simplified, the mold cost and the assembly process difficulty are reduced, the cogging torque is improved, the torque pulsation is reduced, the harmonic magnetic field is weakened, the size precision of the rotor is improved, the diversity of the rotor structure is improved, the vibration noise of the motor is effectively improved, and the operation stability of the motor is improved.
Description
Technical Field
The utility model relates to a permanent-magnet machine technical field especially relates to a powder metallurgy iron core rotor for compressor.
Background
At present, the permanent magnet motor is generally applied to the compressor industry, and the vibration noise of the compressor becomes one of important indexes for judging the performance of the compressor in the industry. Due to the non-sinusoidal influence of the cogging torque and the magnetic field between the stator and the rotor of the permanent magnet motor, the motor has torque fluctuation, the phenomena of vibration noise increase of the compressor and the like are caused, the reliability of the compressor is influenced, and the customer complaints are caused. Therefore, it is important to reduce cogging torque and magnetic field harmonics while improving motor efficiency.
The method for weakening the cogging torque and the magnetic field harmonic waves is multiple, rotor skewed poles are usually adopted, and rotor skewed pole modes common in the industry include a skewed pole type magnetic steel mode and a rotor iron core segmented skewed pole mode. For a permanent magnet motor, the production of the oblique-pole magnetic steel has the defects of high magnetic steel processing difficulty, high die investment cost, complex rotor assembly process, poor rotor size precision, low rotor yield and the like, and is difficult to realize. The method generally adopted at present is that a rotor core is of a segmented oblique pole structure, a plurality of segments of rotor cores and magnetic steel are adopted, the cores are formed by laminating silicon steel sheets through a high-impact die, the magnetic steel is embedded or surface-mounted, and every two adjacent segments of rotor cores and the magnetic steel are staggered by a certain angle along the center of a rotor in the axial direction, so that the rotor oblique pole is realized. However, the number of the high-punching dies of the rotor is usually determined by the number of the rotor segments, and the types of the rotor sheets can be increased due to the segmented oblique-pole structure of the rotor core, so that the design requirement of the high-punching dies of the rotor is greatly improved, and the die cost is increased. In addition, for the convenience of rotor assembly, the magnetic pole shape of the segmented structure is single, the diversity of rotor magnetic pole design is limited, meanwhile, riveting through holes are usually formed in the segmented rotor iron core and used for fixing the iron core, the process is difficult to assemble with magnetic steel, the coaxiality and the size precision of the rotor are difficult to guarantee, and the riveting through holes also become one of important factors restricting the segmented oblique-pole rotor. Therefore, how to optimize the rotor segmented skewed pole structure becomes a technical problem solved by the technical personnel in the field.
Chinese patent document CN106816975A discloses a "magnetic steel surface-mounted rotor oblique pole structure of a permanent magnet synchronous motor and a manufacturing process thereof". The permanent magnet synchronous motor comprises a main shaft, a rotor core arranged on the main shaft, and a plurality of magnetic steels which are arranged on the rotor core and form integral multiples with the number of poles of the permanent magnet synchronous motor, wherein each magnetic steel is attached to the outer circumferential surface of the rotor core, the plurality of magnetic steels are distributed at intervals along the circumferential direction of the rotor core, each magnetic steel comprises a plurality of sections of unit magnetic steels which are sequentially arranged along the axial extension direction of the rotor core, adjacent end faces of two sections of unit magnetic steels are in close contact, and along the axial extension direction of the rotor core, the two adjacent sections of unit magnetic steels are staggered by an angle or a distance to the same direction in the circumferential direction of the rotor core. This rotor passes through the surface subsides and establishes the rotor structure that the magnet steel formed the oblique polar formula, has realized the purpose of rotor chute through the rotor oblique pole, has reduced permanent-magnet motor moment pulsation and higher harmonic, has reduced stray loss to permanent-magnet motor's efficiency has been improved. The rotor core is formed by pressing and fixedly connecting the rotor core punching sheets together, the cost, the design and the manufacturing difficulty of a die are greatly improved, and meanwhile, the shape of the magnetic steel is single, so that the structural diversity of the rotor is reduced.
Disclosure of Invention
The utility model discloses mainly solve in prior art scheme permanent magnet synchronous motor's rotor skewed pole structure, rotor core is formed by rotor core towards piece pressure equipment and fixed connection, the mould cost and the preparation degree of difficulty are high, magnet steel shape and the single technical problem of rotor structure simultaneously, a powder metallurgy iron core rotor for compressor is provided, paste through the powder metallurgy rotor core surface at integrated into one piece and establish the structure of segmentation skewed pole magnet steel, realize obviously weakening permanent magnet motor tooth's socket torque and harmonic magnetic field, simplify rotor segmentation skewed pole structure simultaneously, reduce mould cost and the assembly process degree of difficulty, improve rotor size precision, improve the variety of magnet steel shape and rotor structure.
The purpose of the utility model is mainly solved by the following technical scheme: the utility model discloses a set up at the rotor core of center department and set up at the outside magnet steel group of rotor core, magnet steel group and rotor core fixed connection. The structure simplifies the rotor segmented oblique pole structure and the assembly process, improves the tooth space torque, reduces the torque pulsation, weakens the harmonic magnetic field, effectively improves the vibration noise of the motor and improves the operation stability of the motor.
Preferably, the rotor core is of a cylindrical structure, the rotor core comprises an inner cylinder and an outer cylinder, and the upper end face of the inner cylinder is provided with a magnetizing positioning hole. The rotor core body is formed by powder metallurgy in one piece, and the problems that assembly positioning is difficult and the like caused by a multi-section iron core and magnetic steel are solved while the size precision of the rotor is improved. The number of the magnetizing positioning holes is 1-4, so that the design is convenient to ensure the consistency of the magnetizing polarity of the rotor and ensure the consistency of the rotor and the rotating shaft assembly.
Preferably, the number of the magnetic steel groups is 2p, p is an integer not less than 1, the magnetic steel groups are uniformly distributed along the circumferential direction of the rotor core, the magnetic steel groups are identical in structure, each magnetic steel group comprises a plurality of sections of magnetic steel, the magnetic steel sections are sequentially arranged along the axial direction of the rotor core, and an included angle exists between the centers of the two adjacent sections of magnetic steel and the connecting line of the central axis of the rotor core. The sizes of all sections of magnetic steel of the same magnetic steel group can be the same or different; the adjacent end surfaces of two adjacent sections of magnetic steel of the same magnetic steel group can be in close contact or not; thus, various oblique-pole rotor structures are formed.
Preferably, the coverage angle of each section of magnetic steel of each magnetic steel group along the transverse direction of the rotor core is less than 180 degrees/p. The included angle formed by the centers of two adjacent sections of magnetic steel of the same magnetic steel group and the central axis of the rotor core can be the same or different, and the magnetic steel group structure can be selected through actual conditions.
Preferably, the upper end face and the lower end face of the outer cylinder of the rotor core are uniformly provided with magnetic steel limiting blocks, and the number of the magnetic steel limiting blocks on each end face is the same as that of the magnetic steel groups. The top and the bottom of every magnet steel group are spacing by the magnet steel stopper, take place to reciprocate when preventing the magnet steel solidification, influence the rotor structure, and the stopper is the powder metallurgy material simultaneously, sets up and helps reducing magnet steel tip magnetic leakage at magnet steel group both ends.
Preferably, a gap is formed between the contact surfaces of the inner arc of the magnetic steel and the outer arc of the rotor core. The clearance between magnet steel and rotor core is as storing up gluey space, guarantees rotor excircle size precision, improves the rotor axiality, helps promoting the operating stability of motor.
Preferably, the outer surface of the outer cylinder of the rotor core is provided with a rotor magnetic steel slot group. The rotor core body is formed by powder metallurgy in one piece, and when the size precision of the rotor is improved, the problems that the assembly positioning is difficult and the like caused by a plurality of sections of iron cores and magnetic steel are solved.
Preferably, the number of the magnetic steel slot groups is 2p, p is an integer not less than 1, the magnetic steel slot groups are uniformly distributed along the circumferential direction of the rotor core, the magnetic steel slot groups are identical in structure, each magnetic steel slot group comprises a plurality of magnetic steel slots, the magnetic steel slots are sequentially arranged along the axial direction of the rotor core, and an included angle exists between the center of each two adjacent magnetic steel slots of each magnetic steel slot group and the connecting line of the central axis of the rotor core. The sizes of the magnetic steel grooves in the same magnetic steel groove group can be the same or different; two adjacent magnetic steel grooves of the same magnetic steel groove group can be directly communicated or not communicated, and the specific structure of the magnetic steel groove group is determined according to the structure of the magnetic steel group.
Preferably, the angle covered by each magnetic steel slot (4) of each magnetic steel slot group along the transverse direction of the rotor core is less than 180 degrees/p. The included angle formed by the centers of two adjacent magnetic steel slots of the same magnetic steel slot group and the central axis of the rotor core can be the same or different, and the magnetic steel slot group structure is selected through actual conditions.
Preferably, the upper end face and the lower end face of the outer cylinder of the rotor core are uniformly provided with magnetic steel limiting blocks, and the number of the magnetic steel limiting blocks on each end face is the same as that of the magnetic steel groups. The top and the bottom of every magnet steel group are spacing by the magnet steel stopper, take place to reciprocate when preventing the magnet steel solidification, influence the rotor structure, and the stopper is the powder metallurgy material simultaneously, sets up and helps reducing magnet steel tip magnetic leakage at magnet steel group both ends.
The utility model has the advantages that:
1. the utility model discloses powder metallurgy iron core rotor's iron core body adopts powder metallurgy integrated into one piece structure, when improving rotor size precision, improving production efficiency, has avoided rotor core towards piece pressure equipment technical mould with high costs, design and preparation degree of difficulty height to and the assembly positioning difficulty scheduling problem that multistage iron core and magnet steel lead to.
2. The utility model discloses powder metallurgy iron core rotor adopts segmentation magnet steel oblique polar structure, has simplified rotor segmentation oblique polar structure and assembly process, improves tooth's socket torque simultaneously, reduces the torque ripple, weakens the harmonic magnetic field, effectively improves motor vibration noise, improves motor operating stability.
3. The utility model discloses the shape size of each magnet steel and the contained angle that two adjacent magnet steel centers and rotor core axis formed can be chosen wantonly in the magnet steel group of powder metallurgy iron core rotor, through changing magnet steel shape and size and contained angle size, can form multiple rotor slant pole structure, has improved rotor structure variety.
Drawings
Fig. 1 is a schematic view of a rotor structure according to the present invention;
fig. 2 is a schematic structural view of a rotor core according to a first embodiment of the present invention;
fig. 3 is a top view of a rotor core structure according to a first embodiment of the rotor of the present invention;
fig. 4 is a schematic view of a rotor core structure of a second embodiment of the rotor of the present invention;
fig. 5 is a top view of a rotor core structure according to a second embodiment of the present invention;
fig. 6 is a schematic view of a magnetic steel structure of the present invention;
fig. 7 is a top view of the magnetic steel structure of the present invention.
In the figure, 1 rotor core, 2 magnetic steels, 3 magnetizing positioning holes, 4 magnetic steel grooves and 5 magnetic steel limiting blocks are arranged.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example 1: a powder metallurgy core rotor for a compressor of the present embodiment, as shown in fig. 1, includes a rotor core 1 disposed at the center, and a magnetic steel set disposed outside the rotor core 1. Rotor core 1 pastes through glue with the magnet steel group, and magnet steel 2 inner arc is equipped with the clearance with 1 outer arc contact surface of rotor core, and as storing up gluey space, when guaranteeing rotor excircle size precision, improve the rotor axiality, help promoting the operating stability of motor.
As shown in fig. 2 and 3, the rotor core 1 is integrally formed by powder metallurgy, so that the dimensional accuracy of the rotor is improved, and the problems of difficult assembly and positioning and the like caused by a plurality of sections of cores and magnetic steel 2 are solved; the rotor iron core 1 is of a cylindrical structure, the main structure of the iron core comprises an inner cylinder and an outer cylinder, magnetizing positioning holes 3 are formed in the upper end face of the inner cylinder, the number of the magnetizing positioning holes 3 is 1-4, and the consistency of the rotor magnetizing polarity and the assembly consistency of the rotor and a rotating shaft can be guaranteed; the up end and the lower terminal surface of 1 outer cylinder of rotor core evenly set up magnet steel stopper 5, and the quantity of magnet steel stopper 5 in each terminal surface is the same with the quantity of magnet steel group to this guarantees to be spacing by magnet steel stopper 5 in the top and the bottom of every magnet steel group, takes place to reciprocate when preventing magnet steel 2 solidification, influences the rotor structure, and the stopper is the powder metallurgy material simultaneously, sets up and helps reducing magnet steel 2 tip magnetic leakage at magnet steel group both ends.
The magnetic steel groups are arranged on the outer surface of the rotor core 1, the number of the magnetic steel groups is 2p, p is an integer not less than 1, the shape and the structure of each magnetic steel group are completely the same and are uniformly distributed along the circumferential direction of the rotor core 1, each magnetic steel group comprises a plurality of sections of magnetic steel 2, and the sizes of the sections of magnetic steel 2 of the same magnetic steel group can be the same or different; the magnetic steels 2 are sequentially arranged along the axial direction of the rotor core 1, and the adjacent end surfaces of two adjacent sections of magnetic steels 2 in the same magnetic steel group can be in close contact or can not be in contact; an included angle exists between the centers of two adjacent sections of magnetic steel 2 and the central axis of the rotor core 1, the included angles formed between the centers of two adjacent sections of magnetic steel 2 of the same magnetic steel group and the central axis of the rotor core 1 can be the same or different, and the included angle between the left end surface of the first section of magnetic steel 2 and the right end surface of the last section of magnetic steel 2 of each magnetic steel group and the central axis of the rotor core 1 is less than 180 degrees/p. The magnetic steel group structure can be selected through actual conditions, and thus the oblique-pole rotor structure is formed.
In this embodiment, the quantity of rotor core 1 up end locating hole 3 that magnetizes is 2, and rotor core 1 is equipped with 4 magnet steel groups outward, and every magnet steel group includes 4 sections the same magnet steel 2, and magnet steel 2 adopts U-shaped magnet steel commonly used, as shown in fig. 6, 7. The U-shaped magnetic steel is selected without trimming the excircle of the magnetic steel, so that an uneven air gap magnetic field is established, and the processing difficulty of the magnetic steel is effectively reduced. Every magnet steel 2 shape size is unanimous, and magnet steel 2 periphery is equipped with the radius, reduces the area of contact with rotor core 1, avoids magnet steel 2 impaired.
Example 2: a powder metallurgy core rotor for a compressor of the present embodiment, as shown in fig. 1, includes a rotor core 1 disposed at the center, and a magnetic steel set disposed outside the rotor core 1. Rotor core 1 pastes through glue with magnet steel group, and magnet steel 2 inner arc is equipped with the clearance with 1 outer arc contact surface of rotor core, and as storing up gluey space, when guaranteeing rotor excircle size precision, improve the rotor axiality, help promoting the operating stability of motor.
As shown in fig. 4 and 5, the rotor core 1 is integrally formed by powder metallurgy, so that the dimensional accuracy of the rotor is improved, and the problems of difficult assembly and positioning and the like caused by a plurality of sections of cores and magnetic steel 2 are solved; the rotor iron core 1 adopts a cylindrical surface slotting structure, the iron core main structure comprises an inner cylinder and an outer cylinder, the upper end surface of the inner cylinder is provided with magnetizing positioning holes 3, the number of the magnetizing positioning holes 3 is 1-4, and the consistency of the rotor magnetizing polarity and the assembly of the rotor and the rotating shaft can be ensured; the up end and the lower terminal surface of 1 outer cylinder of rotor core evenly set up magnet steel stopper 5, and the quantity of magnet steel stopper 5 in each terminal surface is the same with the quantity of magnet steel group to this guarantees to be spacing by magnet steel stopper 5 in the top and the bottom of every magnet steel group, takes place to reciprocate when preventing magnet steel 2 solidification, influences the rotor structure, and the stopper is the powder metallurgy material simultaneously, sets up and helps reducing magnet steel 2 tip magnetic leakage at magnet steel group both ends.
The outer surface of the outer cylinder of the rotor iron core 1 is provided with rotor magnetic steel slot groups, the number of the magnetic steel slot groups is 2p, p is an integer not less than 1, the structural shapes of the magnetic steel slot groups are completely the same, the magnetic steel slot groups are uniformly distributed along the circumferential direction of the rotor iron core 1, each magnetic steel slot group comprises a plurality of magnetic steel slots 4, and the sizes of the magnetic steel slots 4 in the same magnetic steel slot group can be the same or different; each magnetic steel slot 4 is arranged along the axial direction of the rotor core 1 in sequence, and two adjacent magnetic steel slots 4 in the same magnetic steel slot group can be directly communicated or not communicated; the included angle between the center of each two adjacent magnetic steel slots 4 of each magnetic steel slot group and the connecting line of the central axis of the rotor core 1 is equal to or different from the included angle between the center of each two adjacent magnetic steel slots 4 of the same magnetic steel slot group and the central axis of the rotor core 1, and the included angle between the left end surface of the first magnetic steel slot 4 and the connecting line between the right end surface of the last magnetic steel slot 4 of each magnetic steel slot group and the central axis of the rotor core 1 is less than 180 degrees/p. The specific structure of the magnetic steel slot group is determined according to the structure of the magnetic steel group.
The magnetic steel groups are arranged on the outer surface of the rotor core 1, the number of the magnetic steel groups is 2p, p is an integer not less than 1, the shape and the structure of each magnetic steel group are completely the same and are uniformly distributed along the circumferential direction of the rotor core 1, each magnetic steel group comprises a plurality of sections of magnetic steel 2, and the sizes of the sections of magnetic steel 2 of the same magnetic steel group can be the same or different; the magnetic steels 2 are sequentially arranged along the axial direction of the rotor core 1, and the adjacent end surfaces of two adjacent sections of magnetic steels 2 in the same magnetic steel group can be in close contact or can not be in contact; an included angle exists between the centers of two adjacent sections of magnetic steel 2 and the central axis of the rotor core 1, the included angles formed between the centers of two adjacent sections of magnetic steel 2 of the same magnetic steel group and the central axis of the rotor core 1 can be the same or different, and the included angle between the left end surface of the first section of magnetic steel 2 and the right end surface of the last section of magnetic steel 2 of each magnetic steel group and the central axis of the rotor core 1 is less than 180 degrees/p. The magnetic steel group structure can be selected through actual conditions, and thus the oblique-pole rotor structure is formed.
In this embodiment, the quantity of rotor core 1 up end locating hole 3 that magnetizes is 2, and rotor core 1 is equipped with 4 magnet steel groups outward, and every magnet steel group includes 4 sections the same magnet steel 2, and magnet steel 2 adopts U-shaped magnet steel commonly used, as shown in fig. 6, 7. The U-shaped magnetic steel is selected without trimming the excircle of the magnetic steel, so that an uneven air gap magnetic field is established, and the processing difficulty of the magnetic steel is effectively reduced. Every magnet steel 2 shape size is unanimous, and magnet steel 2 periphery is equipped with the radius, reduces the area of contact with rotor core 1, avoids magnet steel 2 impaired. The magnetic steel groove 4 is square or U-shaped.
When the magnetic steel compressor is used, the magnetic steel 2 is fixed on the outer surface of the rotor core 1 integrally formed through powder metallurgy or in the magnetic steel groove 4 of the rotor core 1 through glue, the obtained rotor simultaneously improves the tooth space torque, the torque pulsation is reduced, the harmonic magnetic field is weakened, the vibration noise of the motor of the compressor is reduced, the running stability of the motor is improved, meanwhile, the rotor segmented skewed pole structure and the assembling process are simplified, and the size precision and the production efficiency of the rotor are improved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the terms rotor core, magnetic steel, magnetizing positioning holes, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations of the present invention.
Claims (10)
1. The utility model provides a powder metallurgy iron core rotor for compressor which characterized in that, is including setting up rotor core (1) and the magnet steel group of setting in rotor core (1) outside in center department, magnet steel group and rotor core (1) fixed connection.
2. The powder metallurgy iron core rotor for the compressor according to claim 1, wherein the rotor iron core (1) is of a cylindrical structure, the rotor iron core (1) comprises an inner cylinder and an outer cylinder, and the upper end face of the inner cylinder is provided with the magnetizing positioning hole (3).
3. The powder metallurgy iron core rotor for the compressor according to claim 1, wherein the number of the magnetic steel groups is 2p, p is an integer not less than 1, each magnetic steel group is uniformly distributed along the circumferential direction of the rotor iron core (1), the structures of the magnetic steel groups are the same, each magnetic steel group comprises a plurality of sections of magnetic steel (2), each section of magnetic steel (2) is sequentially arranged along the axial direction of the rotor iron core (1), and an included angle exists between the center of each two adjacent sections of magnetic steel (2) and the connecting line of the center axis of the rotor iron core (1).
4. The powder metallurgy core rotor for the compressor according to claim 3, wherein the coverage angle of each segment of the magnetic steel of each magnetic steel group along the transverse direction of the rotor core is less than 180 °/p.
5. The powder metallurgy iron core rotor for the compressor according to claim 2, wherein the upper end face and the lower end face of the outer cylinder of the rotor iron core (1) are uniformly provided with the magnetic steel limiting blocks (5), and the number of the magnetic steel limiting blocks (5) on each end face is the same as that of the magnetic steel groups.
6. The powder metallurgy iron core rotor for the compressor is characterized in that a gap is arranged between contact surfaces of an inner arc of the magnetic steel (2) and an outer arc of the rotor iron core (1).
7. The powder metallurgy iron core rotor for the compressor according to claim 2, wherein the outer surface of the outer cylinder of the rotor iron core (1) is provided with a rotor magnetic steel groove group.
8. The powder metallurgy core rotor for the compressor according to claim 7, wherein the number of the magnetic steel slot groups is 2p, p is an integer not less than 1, the magnetic steel slot groups are uniformly distributed along the circumferential direction of the rotor core (1), the magnetic steel slot groups have the same structure, each magnetic steel slot group comprises a plurality of magnetic steel slots (4), the magnetic steel slots (4) are sequentially arranged along the axial direction of the rotor core (1), and the center of two adjacent magnetic steel slots (4) of each magnetic steel slot group forms an included angle with the connecting line of the central axis of the rotor core (1).
9. Powder metallurgy core rotor for compressors according to claim 8, wherein each magnet slot (4) of each said set covers an angle of less than 180 °/p in the rotor core transverse direction.
10. The powder metallurgy iron core rotor for the compressor according to claim 7, wherein the upper end face and the lower end face of the outer cylinder of the rotor iron core (1) are uniformly provided with the magnetic steel limiting blocks (5), and the number of the magnetic steel limiting blocks (5) on each end face is the same as that of the magnetic steel groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221297255.5U CN217769645U (en) | 2022-05-26 | 2022-05-26 | Powder metallurgy iron core rotor for compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221297255.5U CN217769645U (en) | 2022-05-26 | 2022-05-26 | Powder metallurgy iron core rotor for compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769645U true CN217769645U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221297255.5U Active CN217769645U (en) | 2022-05-26 | 2022-05-26 | Powder metallurgy iron core rotor for compressor |
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| Country | Link |
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| CN (1) | CN217769645U (en) |
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2022
- 2022-05-26 CN CN202221297255.5U patent/CN217769645U/en active Active
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