CN217769639U - Mixed excitation synchronous motor rotor magnetic steel mounting structure - Google Patents
Mixed excitation synchronous motor rotor magnetic steel mounting structure Download PDFInfo
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- CN217769639U CN217769639U CN202221441031.7U CN202221441031U CN217769639U CN 217769639 U CN217769639 U CN 217769639U CN 202221441031 U CN202221441031 U CN 202221441031U CN 217769639 U CN217769639 U CN 217769639U
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- 230000005284 excitation Effects 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 20
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The utility model relates to a mixed excitation synchronous machine rotor magnet steel mounting structure, relate to motor device technical field, it includes the rotor, magnet and mounting, the magnet is located the circumference lateral wall of rotor, set up on the rotor and supply the magnet to place and fixed slot, the mounting sets up on the rotor and is used for being fixed in the fixed slot with the magnet, one side that the mounting is close to the rotor is provided with the locking piece that is used for locking the mounting, set up the locking groove that supplies locking piece to insert and lock on the rotor, the locking groove is located the axial lateral wall of rotor. The motor has the effect that the permanent magnet is not easy to fall off when the rotor of the motor rotates.
Description
Technical Field
The application relates to the technical field of motor devices, in particular to a magnetic steel mounting structure of a rotor of a hybrid excitation synchronous motor.
Background
The hybrid excitation motor is a novel motor which changes the topological structure of the motor on the premise of keeping the higher efficiency of the motor, so that two excitation sources jointly generate a main magnetic field of the motor, and the main magnetic field regulation and control of the motor are realized, thereby improving the speed regulation, the driving performance or the voltage regulation characteristic of the motor.
In the related art, hybrid excitation realizes electromagnetic energy conversion through interaction of two excitation sources of permanent magnet excitation or electric excitation. The hybrid excitation motor is generally provided with a magnet in a rotor, and can be divided into a rotor permanent magnet type hybrid excitation motor and a stator permanent magnet type hybrid excitation motor through the placement position of a permanent magnet of the motor, and the rotor permanent magnet type hybrid excitation motor is generally adopted.
With respect to the related art in the above, the inventors consider that: since the permanent magnet is mounted on the rotor of the motor, the permanent magnet is likely to fall off when the rotor of the motor rotates, thereby affecting the operational reliability, and there is room for improvement.
SUMMERY OF THE UTILITY MODEL
In order to make the permanent magnet be difficult to take place to drop when the rotor of motor is rotatory, this application provides a mixed excitation synchronous machine rotor magnet steel mounting structure.
The application provides a pair of mixed excitation synchronous machine rotor magnet steel mounting structure adopts following technical scheme:
the utility model provides a mixed excitation synchronous machine rotor magnet steel mounting structure, includes rotor, magnet and mounting, the magnet is located on the circumference lateral wall of rotor, seted up the confession on the rotor the fixed slot that the magnet was placed and is fixed, the mounting set up in just be used for on the rotor with the magnet is fixed in the fixed slot, the mounting is close to one side of rotor is provided with and is used for the locking piece of mounting, seted up the confession on the rotor the locking groove that the locking piece inserted and locked, the locking groove is located on the axial lateral wall of rotor.
Through adopting above-mentioned technical scheme, insert and lock in the locking groove through the locking piece, lock the mounting on the rotor to in being fixed in the fixed slot with the magnet through the mounting, make the magnet be difficult to take place to drop when the rotor of motor is rotatory.
Optionally, be provided with on the circumference lateral wall of rotor and be used for spacing and fixed the fixed block of mounting, set up the confession on the rotor the locking piece removes the groove that slides, remove the groove with locking groove intercommunication each other, be provided with on the rotor and be used for locking the locking mechanism of locking piece.
Through adopting above-mentioned technical scheme, set up the fixed block on the rotor, through inserting locking piece in the locking inslot after sliding to removing the inslot to carry on spacingly to the mounting through the fixed block, and lock locking piece through locking mechanical system, thereby make the magnet be difficult to take place to drop when the rotor of motor is rotatory.
Optionally, locking mechanical system includes locking lid and locking subassembly, the confession has been seted up on the locking lid the through hole that the locking piece wore to establish, the through hole remove the groove and locking groove intercommunication each other, the locking lid can dismantle connect in on the axial side of rotor, the locking subassembly is used for the locking piece, locking subassembly demountable installation in the locking is covered.
Through adopting above-mentioned technical scheme, through can dismantling the connection on the rotor with the locking lid to make things convenient for the operator to maintain the locking lid, and lock the locking piece through the locking subassembly, thereby make the locking piece be difficult to drop from the rotor.
Optionally, the locking assembly includes a housing, a return spring, a pressing column and a limit cover;
the locking cover is provided with a shell placing groove for placing the shell, and the shell placing groove is communicated with the through hole;
the shell is provided with a sliding groove for placing and sliding the reset spring and the pressing column, the pressing column is used for pressing the locking piece, and the reset spring is used for driving the pressing column to move towards one side close to the locking piece;
one side that compresses tightly the post and be close to reset spring is provided with the stopper, spacing lid is located slide on the groove, spacing covering is seted up and is supplied compress tightly the spacing hole that the post wore to establish, spacing hole with the stopper is spacing mutually.
By adopting the technical scheme, the compression column is driven to move by the reset spring, so that the compression column compresses the locking piece, and the locking piece is not easy to fall off from the rotor; the spacing cover and the spacing block are mutually spacing, so that the compression column is not easy to fall off from the shell.
Optionally, the housing is provided with a mounting groove for placing and mounting the limiting cover, and the mounting groove is communicated with the sliding groove.
Through adopting above-mentioned technical scheme, set up the mounting groove on the casing, through placing spacing lid and installing in the mounting groove to fix a position the mounted position of spacing lid, and reduce the shared overall volume of spacing lid and casing.
Optionally, the locking piece is provided with an insertion groove for inserting and fixing the pressing column.
By adopting the technical scheme, the locking piece is provided with the insertion groove, and the pressing column is inserted into and fixed in the insertion groove, so that the contact area between the pressing column and the locking piece is increased, and the locking column is not easy to fall off from the rotor.
Optionally, a fixing column for sleeving and fixing the return spring is arranged on the shell, and the fixing column is located at the bottom of the sliding groove.
Through adopting above-mentioned technical scheme, set up the fixed column on the casing, establish and be fixed in the fixed column through the reset spring cover on, make reset spring be difficult to remove along the direction of vertical fixation post length to reduce reset spring's the damage that receives, extension reset spring's life.
Optionally, a spring placing groove for placing and fixing the return spring is formed in one side, close to the return spring, of the limiting block.
Through adopting above-mentioned technical scheme, set up on the stopper and put the spring groove, through placing reset spring and being fixed in putting the spring inslot, make reset spring be difficult to remove along the direction of vertical fixation post length to reduce reset spring's the damage that receives, extension reset spring's life.
Optionally, a connecting column for connecting the locking piece is arranged on the fixing piece.
Through adopting above-mentioned technical scheme, set up the spliced pole on the mounting, connect mounting and locking piece through the spliced pole to adjust the position of locking piece, make things convenient for the operator to install locking piece and mounting.
Optionally, be provided with first spigot surface on compressing tightly the post, first spigot surface is followed reset spring extremely compress tightly the post to being close to the direction slope setting of locking groove, the locking piece is close to one side of spliced pole is provided with be used for with the second spigot surface that first spigot surface mutually supported.
Through adopting above-mentioned technical scheme, set up first spigot surface on compressing tightly the post, set up the second spigot surface on the locking piece, mutually support through first spigot surface and second spigot surface to make things convenient for the operator to insert the locking piece to locking inslot.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the locking piece is inserted into and locked in the locking groove, and the fixing piece is locked on the rotor, so that the magnet is fixed in the fixing groove through the fixing piece, and the magnet is not easy to fall off when the rotor of the motor rotates;
2. the locking piece is inserted into the locking groove and then slides into the moving groove, so that the fixing piece is limited through the fixing block, and the locking piece is locked through the locking mechanism, so that the magnet is not easy to fall off when the rotor of the motor rotates;
3. the first guide surface and the second guide surface are mutually matched, so that an operator can conveniently insert the locking piece into the locking groove.
Drawings
Fig. 1 is an overall structural schematic diagram of a rotor magnetic steel mounting structure of a hybrid excitation synchronous motor in an embodiment of the present application.
Fig. 2 is an exploded view of the rotor, magnet, mount, locking cover and locking assembly in an embodiment of the present application.
Fig. 3 is an exploded view of the locking assembly in an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a pressing column and a limiting block in the embodiment of the present application.
FIG. 5 is a schematic view of the fixing member, the connecting column and the locking member in the embodiment of the present application.
Description of reference numerals: 1. a rotor; 2. a magnet; 3. a fixing member; 4. fixing grooves; 5. a locking member; 6. a locking groove; 7. a fixed block; 8. a moving groove; 9. a locking mechanism; 10. a locking cover; 11. a locking assembly; 12. perforating holes; 13. a housing; 14. a return spring; 15. compressing the column; 16. a limiting cover; 17. a shell placing groove; 18. a sliding groove; 19. a limiting block; 20. a limiting hole; 21. mounting grooves; 22. inserting the groove; 23. fixing a column; 24. a spring releasing groove; 25. connecting columns; 26. a first guide surface; 27. a second guide surface.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
Referring to fig. 1 and 2, an embodiment of the present application discloses a magnetic steel mounting structure for a rotor of a hybrid excitation synchronous motor, which includes a rotor 1, a magnet 2, and a fixing element 3. Rotor 1 is installed on the circumference lateral wall on rotor 1, has seted up on rotor 1 and has supplied magnet 2 to place and fixed slot 4, and the degree of depth of fixed slot 4 equals the thickness of magnet 2 to when making magnet 2 place in fixed slot 4, magnet 2 and rotor 1's circumference lateral wall parallel and level. The fixing piece 3 is used for fixing the magnet 2 in the fixing groove 4, the length direction of the fixing piece 3 is perpendicular to the length direction of the magnet 2, and the length of the fixing piece 3 is larger than the width of the magnet 2. One side an organic whole that mounting 3 is close to rotor 1 is provided with locking piece 5 that is used for locking mounting 3, sets up on rotor 1 and supplies locking piece 5 to insert and the locking groove 6 of locking, and locking groove 6 is located rotor 1's axial lateral wall, adopts transition fit between locking groove 6 and the locking piece 5. The locking piece 5 is L-shaped, and one end of the locking piece 5 is connected with the fixing piece 3, and the other end of the locking piece 5 is inserted into and locked in the locking groove 6. The locking piece 5 is inserted into and locked in the locking groove 6, so that the magnet 2 is fixed in the fixing groove 4 by the fixing piece 3, and the magnet 2 is not easily dropped when the rotor 1 rotates. In this embodiment, two fixing members 3 are provided, and the two fixing members 3 are respectively located at two ends along the length direction of the magnet 2; the locking member 5 is located on the side of the fixing member 3 remote from the other fixing member 3, and the locking member 5 is located in the middle of the fixing member 3.
Referring to fig. 1 and 2, a connection post 25 is integrally formed at one side of the stator 3 close to the rotor 1, a longitudinal direction of the connection post 25 is perpendicular to a longitudinal direction of the stator 3, and the longitudinal direction of the connection post 25 is identical to the longitudinal direction of the magnet 2. The distance between the locking piece 5 and the fixing piece 3 is changed through the connecting column 25, so that the contact position between the fixing piece 3 and the magnet 2 is changed, and an operator can fix the magnet 2 through the fixing piece 3 conveniently.
Referring to fig. 1 and 2, a fixing block 7 for limiting the fixing member 3 is integrally provided on a circumferential side wall of the rotor 1, the fixing block 7 is located on one side of the fixing member 3 close to the connecting member, the fixing block 7 is located on both sides along the length direction of the fixing groove 4, the height of the fixing block 7 is equal to the thickness of the fixing member 3, and the fixing member 3 is limited by the fixing block 7, so that the fixing member 3 is not easily moved along the length direction of the magnet 2. Offer the removal groove 8 that supplies locking piece 5 to slide on the rotor 1, remove groove 8 and be located the one side that locking groove 6 is close to fixed block 7, and remove groove 8 and locking groove 6 intercommunication each other, install the locking mechanical system 9 that is used for locking piece 5 on the rotor 1. The locking piece 5 is locked by the locking mechanism 9, so that the locking piece 5 is not easy to slide in the moving groove 8, and the fixing piece 3 is not easy to move along the length direction of the magnet 2 by the fixing block 7, so that the magnet 2 is fixed, and the magnet 2 is not easy to fall off when the rotor 1 rotates.
Referring to fig. 2 and 3, the locking mechanism 9 includes a locking cover 10 and a locking assembly 11, the locking cover 10 is detachably attached to the axial side of the rotor 1, the locking assembly 11 is detachably mounted on the locking cover 10, and the locking assembly 11 is used for locking the locking member 5. Set up the through hole 12 that supplies locking piece 5 to wear to establish on the locking lid 10, the cross-sectional area of through hole 12 equals the cross-sectional area of moving groove 8 and the sum of locking groove 6 cross-sectional area, and through hole 12, moving groove 8 and locking groove 6 communicate mutually to make locking piece 5 pass can remove in moving groove 8 and locking groove 6 after through hole 12. Through locking piece 5 pass through wear to establish hole 12 and insert to locking groove 6 in to lock subassembly 11 locks locking piece 5 through, thereby makes locking piece 5 be difficult to drop from locking groove 6.
Referring to fig. 2 and 3, the locking assembly 11 includes a housing 13, a return spring 14, a pressing post 15, and a limit cap 16. Offer on the locking lid 10 and supply the casing groove 17 of putting that casing 13 placed, put casing groove 17 and be located one side that rotor 1 was kept away from to locking lid 10, put the degree of depth of casing groove 17 and equal to the thickness of casing 13, the length of putting casing groove 17 equals the length of casing 13 to when making casing 13 place in putting casing groove 17, casing 13 and locking lid 10 parallel and level, and casing 13 and the cell wall parallel and level of shifting chute 8, the length of putting casing groove 17 equals to put casing groove 17 and wear to establish hole 12 and communicate each other.
Referring to fig. 2 and 3, the housing 13 is provided with a sliding groove 18 for placing and sliding the return spring 14 and the pressing column 15, the sliding groove 18 is communicated with the locking groove 6, and the pressing column 15 is located on one side of the bottom of the return spring 14 away from the sliding groove 18. The pressing column 15 is used for pressing the locking piece 5, and the return spring 14 is used for driving the pressing column 15 to move towards the side close to the locking piece 5. The limiting cover 16 is covered on the sliding groove 18, the limiting cover 16 is used for limiting the compression column 15 and the reset spring 14 in the sliding groove 18, a limiting block 19 is integrally arranged on one side, close to the reset spring 14, of the compression column 15, the cross section area of the limiting block 19 is larger than that of the compression column 15, a limiting hole 20 for the compression column 15 to penetrate is formed in the limiting cover 16, the cross section area of the limiting hole 20 is equal to that of the compression column 15, and the limiting hole 20 and the limiting block 19 are mutually limited.
Referring to fig. 2 and 3, the housing 13 is provided with an installation groove 21 for placing and installing the position limiting cover 16, and the installation groove 21 is communicated with the sliding groove 18. The depth of the mounting groove 21 is equal to the thickness of the position limiting cover 16, so that the position limiting cover 16 is flush with the housing 13 when the position limiting cover 16 is placed and mounted in the mounting groove 21.
Referring to fig. 3 and 4, a fixing post 23 for the return spring 14 to be sleeved and fixed is welded on the housing 13, and the fixing post 23 is located at the bottom of the sliding groove 18. The return spring 14 is sleeved and fixed on the fixing column 23, so that the return spring 14 is fixed, damage to the return spring 14 is reduced, and the service life of the return spring 14 is prolonged.
Referring to fig. 3 and 4, a spring placing groove 24 for placing and fixing the return spring 14 is formed on one side of the limit block 19 close to the return spring 14. The return spring 14 is placed and fixed in the spring placing groove 24, so that the return spring 14 is fixed, damage to the return spring 14 is reduced, and the service life of the return spring 14 is prolonged.
Referring to fig. 3 and 5, the pressing post 15 is provided with a first guide surface 26, the first guide surface 26 is inclined toward the locking groove 6 from the return spring 14 to the pressing post 15, the locking member 5 is provided with a second guide surface 27 for cooperating with the first guide surface 26, and the second guide surface 27 is inclined away from the locking groove 6 from the locking member 5 to the pressing post 15. The locking member 5 is facilitated to push the pressing cylinder 15 by the first guide surface 26 and the second guide surface 27 cooperating with each other.
Referring to fig. 3 and 5, the locking member 5 is provided with an insertion groove 22 for inserting and fixing the pressing column 15, and the insertion groove 22, the second guide surface 27 and the pressing column 15 are all located on the same axis, so that the pressing column 15 is inserted and fixed in the insertion groove 22 after the pressing column 15 and the locking member 5 are mutually matched through the first guide surface 26 and the second guide surface 27.
The installation process of the rotor magnetic steel installation structure of the hybrid excitation synchronous motor in the embodiment of the application is as follows:
1. the locking cover 10 is attached to the rotor 1, and the through hole 12, the locking groove 6, and the moving groove 8 are communicated with each other.
2. The locking member 5 is inserted into the moving groove 8 until the locking member 5 is completely inserted into the moving groove 8.
3. The locking piece 5 is moved, the second guide surface 27 on the locking piece 5 and the pressing column 15 are mutually matched through the first guide surface 26, so that the pressing column 15 enters the sliding groove 18 and presses the return spring 14 until the fixing piece 3 is tightly abutted against the circumferential side wall of the rotor 1, at the moment, the fixing piece 3 is tightly abutted against the limiting block 19, and at the moment, the return spring 14 drives the pressing column 15 to move towards the direction close to the locking piece 5, so that the pressing column 15 is inserted into and fixed in the insertion groove 22.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a hybrid excitation synchronous machine rotor magnet steel mounting structure which characterized in that: comprises a rotor (1), a magnet (2) and a fixing piece (3), wherein the magnet (2) is positioned on the circumferential side wall of the rotor (1), a fixing groove (4) for placing and fixing the magnet (2) is formed in the rotor (1), the fixing piece (3) is arranged on the rotor (1) and is used for fixing the magnet (2) in the fixing groove (4), fixing piece (3) are close to one side of rotor (1) is provided with and is used for the locking piece (5) of fixing piece (3), the confession has been seted up on rotor (1) locking piece (5) insert and locking groove (6), locking groove (6) are located on the axial lateral wall of rotor (1).
2. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 1, characterized in that: be provided with on the circumference lateral wall of rotor (1) and be used for spacingly and fixed block (7) of mounting (3), the confession has been seted up on rotor (1) removal groove (8) that locking piece (5) slided, remove groove (8) with locking groove (6) intercommunication each other, be provided with on rotor (1) and be used for the locking mechanical system (9) of locking piece (5).
3. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 2, characterized in that: locking mechanical system (9) are including locking lid (10) and locking subassembly (11), offer the confession on locking lid (10) wear to establish hole (12) that locking piece (5) wore to establish, wear to establish hole (12) remove groove (8) and locking groove (6) communicate each other, locking lid (10) can dismantle connect in on the axial side of rotor (1), locking subassembly (11) are used for the locking piece (5), locking subassembly (11) demountable installation in on locking lid (10).
4. A hybrid excitation synchronous machine rotor magnetic steel mounting structure according to claim 3, characterized in that: the locking assembly (11) comprises a shell (13), a return spring (14), a pressing column (15) and a limiting cover (16);
a shell placing groove (17) for placing the shell (13) is formed in the locking cover (10), and the shell placing groove (17) is communicated with the through hole (12);
the shell (13) is provided with a sliding groove (18) for placing and sliding the reset spring (14) and the pressing column (15), the pressing column (15) is used for pressing the locking piece (5), and the reset spring (14) is used for driving the pressing column (15) to move towards one side close to the locking piece (5);
compress tightly post (15) and be close to one side of reset spring (14) is provided with stopper (19), spacing lid (16) lid is located slide on groove (18), set up the confession on spacing lid (16) compress tightly spacing hole (20) that post (15) wore to establish, spacing hole (20) with stopper (19) are spacing mutually.
5. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 4, characterized in that: the shell (13) is provided with an installation groove (21) for placing and installing the limiting cover (16), and the installation groove (21) is communicated with the sliding groove (18).
6. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 4, characterized in that: and the locking piece (5) is provided with an insertion groove (22) for the compression column (15) to be inserted and fixed.
7. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 4, characterized in that: a fixing column (23) for sleeving and fixing the return spring (14) is arranged on the shell (13), and the fixing column (23) is positioned at the bottom of the sliding groove (18).
8. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 4, characterized in that: and one side of the limiting block (19) close to the return spring (14) is provided with a spring placing groove (24) for placing and fixing the return spring (14).
9. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 4, characterized in that: the fixing piece (3) is provided with a connecting column (25) used for connecting the locking piece (5).
10. The rotor magnetic steel mounting structure of the hybrid excitation synchronous motor according to claim 9, characterized in that: compress tightly and be provided with first spigot surface (26) on post (15), first spigot surface (26) are followed reset spring (14) extremely compress tightly post (15) to being close to the direction slope setting of locking groove (6), locking piece (5) are close to one side of spliced pole (25) be provided with be used for with first spigot surface (26) second spigot surface (27) of mutually supporting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221441031.7U CN217769639U (en) | 2022-06-09 | 2022-06-09 | Mixed excitation synchronous motor rotor magnetic steel mounting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221441031.7U CN217769639U (en) | 2022-06-09 | 2022-06-09 | Mixed excitation synchronous motor rotor magnetic steel mounting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769639U true CN217769639U (en) | 2022-11-08 |
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ID=83892627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221441031.7U Active CN217769639U (en) | 2022-06-09 | 2022-06-09 | Mixed excitation synchronous motor rotor magnetic steel mounting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769639U (en) |
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2022
- 2022-06-09 CN CN202221441031.7U patent/CN217769639U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240730 Address after: Building 2-5, No. 155 Meichuan West Road, Longquan Village, Henghe Town, Cixi City, Ningbo City, Zhejiang Province, 315300 Patentee after: Ningbo Zhonghang Magnetic Industry Co.,Ltd. Country or region after: China Address before: 315318 No. 155 Meichuan West Road, Henghe Town, Cixi City, Ningbo City, Zhejiang Province Patentee before: NINGBO ZHONGHANG MAGNETIC MATERIALS CO.,LTD. Country or region before: China |
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| TR01 | Transfer of patent right |