CN215733729U - Central motor rotor and stator iron core structure - Google Patents
Central motor rotor and stator iron core structure Download PDFInfo
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- CN215733729U CN215733729U CN202121919541.6U CN202121919541U CN215733729U CN 215733729 U CN215733729 U CN 215733729U CN 202121919541 U CN202121919541 U CN 202121919541U CN 215733729 U CN215733729 U CN 215733729U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- 238000004080 punching Methods 0.000 claims abstract description 82
- 238000010030 laminating Methods 0.000 claims abstract description 7
- 230000005389 magnetism Effects 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a rotor-stator core structure of a centrally-mounted motor, which comprises a rotor core, magnetic steel inserted in a magnetic steel groove of the rotor core and a stator core sleeved outside the rotor core, wherein the rotor core is provided with a plurality of magnetic steel slots; the rotor core is formed by laminating a plurality of rotor punching sheets, each rotor punching sheet comprises a plurality of rotor tooth parts distributed at intervals in the circumferential direction, a magnetic steel groove is formed between every two adjacent rotor tooth parts, each rotor punching sheet comprises a plurality of open punching sheets and a closed punching sheet, and one end, far away from the center of each rotor punching sheet, of each adjacent rotor tooth part of each closed punching sheet is connected; the outer contour line of one end of the rotor tooth part, which is far away from the center of the rotor punching sheet, is a first arc section, the circle where the first arc section is located is an actual circle, and the circle center of the actual circle and the center of the rotor punching sheet are eccentrically arranged. The motor has higher output capability and stronger structural stability; in addition, the cogging torque of the motor is improved, so that the motor runs more stably.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a rotor and stator core structure of a centrally-mounted motor.
Background
The motor is a device for realizing electric energy conversion or transmission according to the electromagnetic induction law, wherein the most important is to be used as a power source of an electric appliance or various machines by generating driving torque; a permanent magnet synchronous motor is one of motors, and is widely used due to its low price and high efficiency.
At present, most of brushless middle-mounted motors on the market adopt embedded permanent magnet synchronous motors, and rotor punching sheets of the brushless middle-mounted motors have two structures, wherein one structure is that the radial outer side of a magnetic steel groove is open, and the other structure is that the radial outer side of the magnetic steel groove is closed. The closed rotor has high strength, good structural stability, low noise generated during high-speed rotation, but insufficient output capacity. To achieve higher output capacities, open rotors are often used, the maximum output of which can be 30% higher than that of closed rotors. However, the open rotor core has low structural strength, and is easily deformed during transportation or transportation, resulting in large original unbalance of the rotor, poor stability during high-speed operation, and easy generation of high noise. In addition, the iron core structure of the current embedded permanent magnet synchronous motor can generate vibration and noise due to the influence of cogging torque, and the motor cannot run stably due to the fluctuation of the rotating speed.
Therefore, a new structure of the rotor-stator core needs to be designed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a rotor and stator core structure of a centrally-mounted motor, which has strong structural stability, stable operation and higher output capacity; can effectively reduce the cogging torque, thereby reducing the vibration noise.
The utility model is realized by the following technical scheme:
a structure of a rotor core and a stator core of a centrally-mounted motor comprises a rotor core, magnetic steel inserted into a magnetic steel groove of the rotor core and a stator core sleeved outside the rotor core; the rotor core is formed by laminating a plurality of rotor punching sheets, each rotor punching sheet comprises a plurality of rotor tooth parts distributed at intervals in the circumferential direction, a magnetic steel groove is formed between every two adjacent rotor tooth parts, each rotor punching sheet comprises a plurality of open punching sheets and a closed punching sheet, and one end, far away from the center of each rotor punching sheet, between the adjacent rotor tooth parts of the closed punching sheets is connected; the outer contour line of one end, far away from the center of the rotor punching sheet, of the rotor tooth portion is a first arc section, a circle where the first arc section is located is an actual circle, and the circle center of the actual circle and the center of the rotor punching sheet are eccentrically arranged.
Further, an equivalent circle tangent to the outer contour line of the rotor punching is formed by taking the center of the rotor punching as a circle center and is taken as the outer circle of the rotor core, and the diameter of the outer circle of the rotor core is the outer diameter of the rotor core; the ratio of the eccentric distance between the actual circle center and the excircle center of the rotor core to the outer diameter of the rotor core is 0.12-0.15.
Furthermore, in the axial direction of the rotor core, the closed punching sheets are intensively distributed on two sides of the rotor core.
Furthermore, in the axial direction of the rotor core, the thickness formed by laminating the single-side closed type punching sheets accounts for 8% -12% of the height of the rotor core.
Furthermore, a first through hole is formed in the center of the rotor punching sheet, and a rotor yoke part is formed around the first through hole; the rotor tooth part and the magnetic steel groove are arranged along the radial direction of the rotor punching sheet, and the rotor tooth part is connected to the rotor yoke part at intervals in the circumferential direction.
Furthermore, one end of each adjacent rotor tooth part of the closed punching sheet, which is far away from the center of the rotor punching sheet, is connected through a first boss, and one end of each rotor tooth part of the open punching sheet, which is far away from the center of the rotor punching sheet, extends into the magnetic steel groove to form a second boss; the first boss and the second boss are abutted to the magnetic steel.
Furthermore, a magnetic steel pre-tightening tongue is formed on the inner side surface, close to the center of the rotor punching sheet, of the magnetic steel groove, and the magnetic steel pre-tightening tongue is abutted to the magnetic steel.
Furthermore, the magnetic steel pre-tightening tongue is only positioned on the closed type punching sheet.
Furthermore, after the magnetic steel is pressed into the magnetic steel groove, a first inner magnetism isolation hole is formed between the magnetic steel and the rotor yoke part; and a first outer magnetism isolating hole is formed between the first boss and the magnetic steel on the first boss.
Further, the stator core comprises a plurality of stator teeth which are circumferentially distributed at intervals, the stator teeth are connected to the inner side of the stator core, and stator slots are formed between every two adjacent stator teeth; one end, close to the rotor core, of the stator tooth part is connected with a pole shoe part, and the side edge, close to the rotor core, of the pole shoe part is composed of a second arc section and straight line sections connected to the two sides of the second arc section.
Compared with the prior art, the utility model has the advantages that:
1. through forming rotor core by opening type towards piece and closing type towards the piece pressure-superposed, can play and improve the magnet steel utilization ratio, improve motor output capacity, can keep rotor core overall structure stability's effect simultaneously.
2. The eccentric design of the circle center of the actual circle where the outer contour line of the rotor tooth part is located and the center of the rotor punching sheet can effectively reduce the cogging torque and the torque fluctuation, so that the vibration noise is reduced.
3. The closed punching sheets are distributed on two sides of the rotor core in a concentrated mode, and the thickness formed by single-side lamination accounts for 8% -12% of the height of the rotor core, so that the effect of enhancing the strength of the core and not influencing the whole magnetic circuit is achieved.
4. Through with rotor tooth portion and magnet steel groove circumference interval distribution to radially setting up along the rotor punching, a magnetic field can be synthesized to per two magnet steels like this, and form effective magnetic pole through rotor core, improved the magnet steel utilization ratio.
5. Through the arrangement of the first boss, the second boss and the magnetic steel pre-tightening tongue, the magnetic steel can be stably positioned in the magnetic steel groove, and the unbalance amount of the rotor is reduced.
6. Through the setting of separating the magnetism hole in first interior and separating the magnetism hole outside first, can play and reduce the magnetic leakage to improve the effect of magnet steel utilization ratio.
7. The side of the pole shoe part close to the rotor core is arranged to be composed of the second arc section and the straight line sections connected to the two sides of the second arc section, so that the cogging torque can be effectively reduced, and the vibration noise is reduced.
Drawings
Fig. 1 is a schematic top view of an overall structure of a motor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a closed punching sheet according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an open type stamped steel according to an embodiment of the utility model;
fig. 4 is a schematic view of an overall structure of a rotor core according to an embodiment of the present invention;
FIG. 5 is a schematic view of an eccentric configuration of the outer contour of a tooth portion of a rotor in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a stator core according to an embodiment of the present invention;
FIG. 7 is a cogging torque waveform of the present invention;
fig. 8 is a cogging torque waveform of the conventional structure.
1. A rotor core; 2. a closed punching sheet; 21. a first boss; 23. a magnetic steel pre-tightening tongue; 3. a first through hole; 4. a rotor yoke portion; 5. a rotor tooth portion; 51. a first arc segment; 52. a true circle; 6. a magnetic steel groove; 7. an open type punching sheet; 71. a second boss; 8. the excircle of the rotor iron core; 9. a stator core; 10. a stator tooth portion; 11. a pole shoe portion; 12. a second arc segment; 13. a straight line segment; 14. a first inner magnetism isolating hole; 15. and (5) magnetic steel.
Detailed Description
The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
As shown in fig. 1, a core structure of a central motor rotor and stator according to an embodiment of the present invention includes a rotor core 1, magnetic steels 15 inserted into magnetic steel slots 6 of the rotor core 1, and a stator core 9 sleeved outside the rotor core 1. The rotor core 1 is formed by laminating a plurality of rotor punching sheets, and the rotor punching sheets forming the rotor core 1 comprise two types, namely an open type punching sheet 7 (refer to fig. 3) and a closed type punching sheet 2 (refer to fig. 2). Each rotor punching sheet comprises a plurality of rotor tooth parts 5 distributed at intervals in the circumferential direction, a magnetic steel groove 6 is formed between every two adjacent rotor tooth parts 5, and one ends, far away from the center of the rotor punching sheet, of the adjacent rotor tooth parts 5 of the closed punching sheet 2 are connected with each other, so that a closed structure is formed on the radial outer side of each magnetic steel groove 6.
As shown in fig. 2 and fig. 3, a first through hole 3 is formed in the center of the rotor sheet, and a rotor yoke portion 4 is formed around the first through hole 3 by the rotor sheet. The rotor teeth 5 are circumferentially connected to the rotor yoke 4 at intervals, and magnetic steel slots 6 are formed between adjacent rotor teeth 5. When a plurality of rotor punching sheets are laminated into the rotor core 1, the laminated first through hole 3 forms a shaft hole for mounting an output shaft of the motor, and the laminated magnetic steel groove 6 forms a mounting groove for mounting the magnetic steel 15. In this embodiment, the rotor teeth 5 and the magnetic steel slots 6 are radially disposed along the rotor sheet, so that the rotor teeth 5 and the magnetic steel slots 6 are radially distributed. Magnet steel 15 is placed in the V font after inserting in magnet steel groove 6, and every two adjacent magnet steel 15 are synthetic a magnetic field to form effective magnetic pole through rotor core 1, compare with the conventional art, can improve magnet steel 15's utilization ratio like this.
As shown in fig. 2, one end of each of the adjacent rotor teeth 5 of the closed punching sheet 2, which is far from the center of the rotor punching sheet, is connected by a first boss 21, and a magnetic steel pre-tightening tongue 23 is formed on the inner side surface of the magnetic steel slot 6, which is close to the center of the rotor punching sheet (i.e., on the rotor yoke portion 4 at the bottom of the magnetic steel slot 6). When the magnetic steel 15 is inserted into the magnetic steel groove 6, two side faces of the magnetic steel 15 are respectively abutted to the first boss 21 and the magnetic steel pre-tightening tongue 23, so that the magnetic steel 15 is positioned, the magnetic steel 15 is more stably installed in the magnetic steel groove 6, the motor strength is improved, the unbalance amount of the rotor is reduced, and the vibration noise is effectively reduced. Referring to fig. 3, in addition, a second boss 71 can also extend out of the rotor tooth portion 5 of the open type punching sheet 7 in the magnetic steel groove 6, and the second boss 71 is abutted to the magnetic steel groove 6, so that the mounting stability of the magnetic steel 15 can be further improved, and the unbalance amount of the rotor is reduced. After the magnetic steel 15 is inserted into the magnetic steel slot 6, a first inner magnetic isolation hole 14 can be formed between the magnetic steel 15 and the rotor yoke part 4 due to the arrangement of the magnetic steel pre-tightening tongue 23; a notch is formed on the inner side surface of the first boss 21 close to the magnetic steel 15, so that a first outer magnetism isolating hole (not shown in the figure) can be formed between the first boss 21 and the magnetic steel 15. The first inner magnetism isolating hole 14 and the first outer magnetism isolating hole can be magnetic flux barriers, magnetic flux leakage is further prevented, and energy conversion efficiency is improved. In the actual production process, the first boss 21, the second boss 71 and the magnetic steel pre-tightening tongue 23 are integrally arranged with the rotor punching sheet, and the magnetic steel pre-tightening tongue 23 can be arranged on the open type punching sheet 7 or the closed type punching sheet 2. For convenience of production and assembly, the magnetic steel pre-tightening tongue 23 may be only on one punching sheet, for example, in this embodiment, the magnetic steel pre-tightening tongue 23 is located on the closed punching sheet 2.
As shown in fig. 4, in the present embodiment, the closed punching sheets 2 are preferably distributed at two axial ends of the rotor core 1 in a concentrated manner, so as to form two closed punching sheet groups; in order to enhance the strength of the iron core and not affect the whole magnetic circuit, the thickness of the single group of closed punching sheet groups is preferably set to be 8% -12% of the axial length of the rotor iron core 1. Therefore, the central motor has the high output capacity of an open type rotor motor and also has the high-strength structure and low-noise performance of a closed type rotor motor.
In addition, since the permanent magnet synchronous motor generates vibration and noise due to a large cogging torque, although the rotor core 1 can generate a large output torque, the cogging torque is large, and a reverse electromagnetic waveform of the motor is distorted during operation, thereby increasing vibration and noise of the motor. In order to solve the problem, as shown in fig. 5, an outer contour line of one end of the rotor tooth portion 5, which is far away from the center of the rotor sheet, is taken as a first arc segment 51, a circle where the first arc segment 51 is located is taken as an actual circle 52, and the center of the actual circle 52 is eccentrically arranged with respect to the center of the rotor sheet, so that the cogging torque can be effectively reduced, the torque fluctuation is reduced, and the vibration noise is reduced. Forming an equivalent circle tangent to the outer contour line of the rotor punching by taking the center of the rotor punching as the center of a circle as a rotor core excircle 8, wherein the diameter of the rotor core excircle 8 is the outer diameter of the rotor core 1; in this embodiment, it is preferable that the ratio of the eccentric distance d between the center of the actual circle 52 and the center of the outer circle 8 of the rotor core to the outer diameter of the rotor core 1 is set to 0.12 to 0.15, so that the cogging torque can be reduced well (in fig. 5, O is the center of the outer circle 8 of the rotor core, O1 is the center of the actual circle 52, and the distance between O and O1 is the eccentric distance d).
As shown in fig. 6, in the present embodiment, the stator core 9 includes a plurality of circumferentially spaced stator teeth 10, the stator teeth 10 are connected to the inside of the stator core 9, and a stator slot is formed between adjacent stator teeth 10. One end of the stator tooth part 10 close to the rotor core 1 is connected with a pole shoe part 11, and two side parts of the pole shoe part 11 close to the side of the rotor core 1 are made into straight lines, so that the shape of the pole shoe part is composed of a middle second circular arc section 12 and straight line sections 13 symmetrically connected to two sides of the second circular arc section 12. Therefore, the cogging torque can be further reduced, the torque fluctuation is reduced, and the sine of counter electromotive force is improved, so that the vibration noise is reduced.
The implementation principle of the embodiment is as follows: the rotor core 1 is formed by laminating an open type punching sheet and a closed type punching sheet, so that the central motor has the high output capacity of the open type rotor motor and also has the high stability and low noise performance of the closed type rotor motor. Through setting up closed punching sheet 2 and concentrating the stack pressure at 1 both ends of rotor core, can reduce the influence of closed punching sheet 2 to whole magnetic circuit to improve magnet steel 15 utilization ratio. The center of an actual circle 52 where the outer contour line of the rotor tooth part 5 is located is eccentrically arranged with the center of the rotor punching sheet, so that the cogging torque can be effectively reduced, the torque fluctuation is reduced, the vibration noise can be reduced, and the running stability of the motor can be improved. In addition, the stator pole shoe is chamfered, so that the cogging torque can be further reduced, and the vibration noise can be reduced. Compared with the prior art, the middle motor has high output capacity, small tooth space torque, stable operation and less generated vibration noise.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A rotor-stator core structure of a centrally-mounted motor comprises a rotor core (1), magnetic steel (15) inserted into a magnetic steel groove (6) of the rotor core (1), and a stator core (9) sleeved outside the rotor core (1); the rotor core (1) is formed by laminating a plurality of rotor punching sheets, each rotor punching sheet comprises a plurality of rotor tooth parts (5) distributed at intervals in the circumferential direction, and a magnetic steel groove (6) is formed between every two adjacent rotor tooth parts (5), and the rotor punching sheet is characterized by comprising a plurality of open punching sheets (7) and closed punching sheets (2), wherein one ends, far away from the centers of the rotor punching sheets, of the adjacent rotor tooth parts (5) of the closed punching sheets (2) are connected; the outer contour line of one end, far away from the center of the rotor punching sheet, of the rotor tooth portion (5) is a first arc section (51), the circle where the first arc section (51) is located is an actual circle (52), and the circle center of the actual circle (52) and the center of the rotor punching sheet are eccentrically arranged.
2. The structure of the rotor-stator core of the centrally-mounted motor according to claim 1, wherein an equivalent circle tangent to the outer contour line of the rotor sheet is formed by taking the center of the rotor sheet as a circle center and is a rotor core outer circle (8), and the diameter of the rotor core outer circle (8) is the outer diameter of the rotor core (1); the ratio of the eccentric distance between the circle center of the actual circle (52) and the circle center of the excircle (8) of the rotor core to the outer diameter of the rotor core (1) is 0.12-0.15.
3. The structure of the rotor-stator core of the centrally-installed motor according to claim 1, characterized in that the closed punching sheets (2) are distributed on two sides of the rotor core (1) in a centralized manner along the axial direction of the rotor core (1).
4. The structure of the rotor-stator core of the centrally-mounted motor according to claim 3, wherein in the axial direction of the rotor core (1), the thickness formed by laminating the single-side closed punching sheets (2) accounts for 8% -12% of the axial length of the rotor core (1).
5. The structure of a rotor-stator core of a centrally-mounted motor according to claim 1, wherein a first through hole (3) is formed in the center of the rotor punching sheet, and a rotor choke portion (4) is formed around the first through hole (3); rotor tooth portion (5) and magnet steel groove (6) radially set up along the rotor punching, just rotor tooth portion (5) circumference interval ground is connected on rotor yoke portion (4).
6. The structure of a central motor rotor-stator core according to claim 5, wherein one ends of the adjacent rotor teeth (5) of the closed punching sheets (2) far away from the center of the rotor punching sheets are connected through a first boss (21), and one ends of the rotor teeth (5) of the open punching sheets (7) far away from the center of the rotor punching sheets extend into the magnetic steel slots (6) to form second bosses (71); the first boss (21) and the second boss (71) are abutted to the magnetic steel (15).
7. The structure of the core of the centrally-mounted motor rotor and stator according to claim 6, wherein a magnetic steel pre-tightening tongue (23) is formed on the inner side surface of the magnetic steel slot (6) close to the center of the rotor sheet, and the magnetic steel pre-tightening tongue (23) abuts against the magnetic steel (15).
8. The structure of the rotor-stator core of the centrally-mounted motor according to claim 7, characterized in that the magnetic steel pre-tightening tongue (23) is only positioned on the closed punching sheet (2).
9. The structure of a rotor-stator core of a centrally-mounted motor according to claim 7, characterized in that after the magnetic steel (15) is pressed into the magnetic steel slot (6), a first inner magnetism isolation hole (14) is formed between the magnetic steel (15) and the rotor yoke (4); a first outer magnetism isolating hole is formed between the first boss (21) and the magnetic steel (15) on the first boss (21).
10. The structure of a centrally-mounted motor rotor-stator core as claimed in claim 1, wherein the stator core (9) comprises a plurality of circumferentially spaced stator teeth (10), the stator teeth (10) are connected to the inner side of the stator core (9), and stator slots are formed between adjacent stator teeth (10); one end, close to rotor core (1), of stator tooth portion (10) is connected with pole shoe portion (11), the side, close to rotor core (1), of pole shoe portion (11) is formed by second circular arc section (12) and straightway (13) connected on the two sides of second circular arc section (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121919541.6U CN215733729U (en) | 2021-08-17 | 2021-08-17 | Central motor rotor and stator iron core structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121919541.6U CN215733729U (en) | 2021-08-17 | 2021-08-17 | Central motor rotor and stator iron core structure |
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| CN215733729U true CN215733729U (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317250A (en) * | 2023-04-25 | 2023-06-23 | 广东高畅智能液压科技有限公司 | Rotor punching sheet for high-performance permanent magnet synchronous motor |
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2021
- 2021-08-17 CN CN202121919541.6U patent/CN215733729U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317250A (en) * | 2023-04-25 | 2023-06-23 | 广东高畅智能液压科技有限公司 | Rotor punching sheet for high-performance permanent magnet synchronous motor |
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