CN219322207U - Motor assembly and vehicle with same - Google Patents
Motor assembly and vehicle with same Download PDFInfo
- Publication number
- CN219322207U CN219322207U CN202320171848.5U CN202320171848U CN219322207U CN 219322207 U CN219322207 U CN 219322207U CN 202320171848 U CN202320171848 U CN 202320171848U CN 219322207 U CN219322207 U CN 219322207U
- Authority
- CN
- China
- Prior art keywords
- positioning ring
- dynamic balance
- motor
- motor shaft
- rotor core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The utility model discloses a motor assembly and a vehicle with the motor assembly, wherein the motor assembly comprises: motor shaft, rotor core and dynamic balance piece. The rotor core is sleeved on the motor shaft and is provided with a first end face and a second end face at two axial ends; the rotor core is sleeved on the motor shaft and is provided with a first end face and a second end face at two axial ends; the dynamic balance pieces are constructed in a plurality of ways, and the dynamic balance pieces are arranged on the first end face and/or the second end face at intervals around the periphery of the motor shaft. According to the motor assembly, the dynamic balance of the motor rotor can be adjusted by arranging the dynamic balance pieces on the first end face and the second end face at the two axial ends of the rotor core, so that the motor rotor can be kept stable in the high-speed rotation process. Through constructing dynamic balance piece into a plurality ofly, and a plurality of dynamic balance pieces set up in the periphery interval of motor shaft, the consumptive material of dynamic balance piece is fewer, and weight is lighter, has realized motor assembly lightweight.
Description
Technical Field
The utility model relates to the field of vehicle motors, in particular to a motor assembly and a vehicle with the motor assembly.
Background
In the prior art, the rotor in the permanent magnet synchronous motor is used as a high-speed rotating part and can even reach 16000rpm, and the unbalance amount of the motor rotor can be generated in the high-speed rotation due to processing, assembly errors and the like, so that a dynamic balance device is needed to be added in the motor rotor for adjustment, but the currently applied dynamic balance device has more consumable materials, higher cost and heavier weight.
The patent with publication number CN209016868U and patent name of "a motor rotor dynamic balance plate" discloses a dynamic balance plate structure which is widely applied at present, but the dynamic balance plate is more in steel material application and heavier, and the dynamic balance plate structure is matched with a motor rotating shaft by two keys, 2 key grooves are needed to be processed on the motor rotating shaft, 2 keys are needed to be processed on the dynamic balance plate, and the processing cost is higher and the assembly efficiency is low.
The patent with publication number CN115347729A, patent name of dynamic balance plate, motor and vehicle, discloses a dynamic balance plate, and this dynamic balance plate also constructs the form of a big disc, and the consumptive material is more, and the cost is higher, and is heavier.
Therefore, how to design a dynamic balance device, so that the dynamic balance device has fewer consumables and lower cost under the condition of ensuring dynamic balance, and can realize light weight pressure, thus the dynamic balance device becomes a problem to be solved by the prime of the field.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a motor assembly, according to the motor assembly of the present utility model, by providing a plurality of dynamic balancing pieces on a first end face and a second end face of both axial ends of a rotor core, and the plurality of dynamic balancing pieces are arranged at intervals around the outer circumference of a motor shaft, the number of consumable parts of the dynamic balancing pieces is reduced, the weight of the motor assembly is lighter, and the weight of the motor assembly is reduced.
An electric motor assembly according to an embodiment of the present utility model includes: the motor shaft and the rotor iron core are sleeved on the motor shaft and provided with a first end face and a second end face at two axial ends; the dynamic balance pieces are configured in a plurality, the dynamic balance pieces are arranged on the first end face and/or the second end face, and the dynamic balance pieces are arranged at intervals around the periphery of the motor shaft.
According to the motor assembly provided by the embodiment of the utility model, the dynamic balance of the motor rotor can be adjusted by arranging the dynamic balance pieces on the first end face and the second end face at the two axial ends of the rotor core, so that the motor rotor can be kept stable in the high-speed rotation process. Through constructing dynamic balance piece into a plurality of, and a plurality of dynamic balance pieces are in surrounding in the periphery interval setting of motor shaft, compare and set up the dynamic balance board that a structure was the ring respectively at rotor core axial both ends, the dynamic balance piece consumptive material that a plurality of intervals set up in this application is less, and weight is lighter, has realized motor assembly lightweight.
According to some embodiments of the utility model, the dynamic balancing piece is configured as a sector or a sector ring centered on the axis of the motor shaft.
According to some embodiments of the utility model, an adhesive layer is disposed on each dynamic balance piece, and the dynamic balance pieces are fixed to the first end face or the second end face through the adhesive layer.
According to some embodiments of the utility model, the dynamic balance piece is formed with a first lightening hole.
According to some embodiments of the utility model, the motor assembly further comprises: the locking device is sleeved on the motor shaft and arranged at least one end of the rotor core in the axial direction.
According to some embodiments of the utility model, the locking device comprises: the first positioning ring and the second positioning ring are respectively sleeved on the motor shaft and positioned at two ends of the rotor core, and are respectively in interference fit with the motor shaft.
According to some embodiments of the utility model, the motor shaft is formed with a mounting section, and the rotor core, the first positioning ring and the second positioning ring are respectively sleeved on the mounting section.
According to some embodiments of the utility model, the outer periphery of the first positioning ring is provided with a plurality of first protruding parts, and each first protruding part is far away from the first positioning ring along the radial direction and is arranged between two adjacent dynamic balance pieces; the periphery of the second positioning ring is provided with a plurality of second protruding parts, and each second protruding part is far away from the second positioning ring along the radial direction and is arranged between two adjacent dynamic balance sheets.
According to some embodiments of the utility model, the first positioning ring and the second positioning ring are respectively provided with a second lightening hole.
The vehicle according to the present utility model is briefly described below.
The motor assembly according to any one of the embodiments is arranged on the vehicle, and the motor assembly according to any one of the embodiments is arranged on the vehicle, so that the driving motor of the vehicle operates more stably, noise, vibration or abnormal sound cannot be generated in the motor operation process, and the travelling comfort and safety are ensured. Meanwhile, the motor assembly is stable in operation, better in performance and longer in service life, so that frequent maintenance of a motor on a vehicle is not needed, and the market competitiveness of the vehicle is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is an isometric view of a motor assembly according to an embodiment of the utility model;
FIG. 2 is a front view of a motor assembly according to an embodiment of the utility model;
fig. 3 is a side view of a motor assembly according to an embodiment of the utility model.
Reference numerals:
the motor assembly 1 is provided with a motor,
a motor shaft 11, a rotor core 12, a dynamic balance sheet 13, a first positioning ring 14, a second positioning ring 15, a first protruding part 16 and a second lightening hole 17.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the prior art, the rotor in the permanent magnet synchronous motor is used as a high-speed rotating part and can even reach 16000rpm, and the unbalance amount of the motor rotor can be generated in the high-speed rotation due to processing, assembly errors and the like, so that a dynamic balance device is needed to be added in the motor rotor for adjustment, but the currently applied dynamic balance device has more consumable materials, higher cost and heavier weight.
An electric motor assembly according to an embodiment of the present utility model is described below with reference to fig. 1-3.
The motor assembly 1 according to the embodiment of the present utility model includes: a motor shaft 11, a rotor core 12, and a dynamic balance sheet 13. The rotor core 12 is sleeved on the motor shaft 11 and has a first end face and a second end face at two axial ends; the dynamic balance pieces 13 are configured in a plurality, the dynamic balance pieces 13 are arranged on the first end face and/or the second end face, and the dynamic balance pieces 13 are arranged at intervals around the periphery of the motor shaft 11.
According to the motor assembly 1 provided by the embodiment of the utility model, the dynamic balance of the motor rotor can be adjusted by arranging the dynamic balance pieces 13 on the first end face and the second end face at the two axial ends of the rotor core 12, so that the motor rotor can be kept stable in the high-speed rotation process. Through constructing dynamic balance piece 13 into a plurality of, and a plurality of dynamic balance pieces 13 are in surrounding in the periphery interval setting of motor shaft 11, compare and set up the dynamic balance board that a structure was the ring respectively at rotor core 12 axial both ends, the dynamic balance piece 13 consumptive material that a plurality of intervals set up in this application is less, and weight is lighter, has realized motor assembly 1 lightweight.
In some embodiments of the present utility model, the dynamic balancing piece 13 is configured as a sector or a sector ring centered on the axis of the motor shaft 11. In one embodiment of the present utility model, the dynamic balance pieces 13 are configured as a fan ring centering around the axis of the motor shaft 11, and the plurality of dynamic balance pieces 13 are uniformly spaced around the outer circumference of the motor shaft 11. The outer diameter of the dynamic balance piece 13 corresponds to the outer diameter of the rotor core 12. By constructing the dynamic balance sheet 13 as a sector or a sector ring with the axis of the motor shaft 11 as the center, when the dynamic balance sheet 13 is mounted on the rotor core 12, the outer diameter of the dynamic balance sheet 13 is overlapped with the outer diameter of the rotor core 12, so that the dynamic balance sheet 13 is convenient to position, a plurality of dynamic balance sheets 13 can be uniformly distributed on the end surfaces of the two axial ends of the rotor core 12, the uniform weight distribution of the dynamic balance sheet 13 is ensured, and the subsequent punching and de-weighting on the dynamic balance sheet 13 are convenient, so that the motor rotor can completely realize dynamic balance.
In some embodiments of the present utility model, an adhesive layer is provided on each dynamic balance sheet 13, and the dynamic balance sheet 13 is fixed to the first end surface or the second end surface by the adhesive layer. Since an adhesive layer is provided on each dynamic balance piece 13, each dynamic balance piece 13 can be attached to the rotor core 12 by means of adhesion. Compare in traditional ring dynamic balance board, need process key on dynamic balance board when the installation, need process the keyway on motor shaft 11, dynamic balance piece 13 in this application is connected through the mode of bonding, and the installation is more convenient, has increased assembly efficiency, and has saved the processing expense of processing key and keyway.
In some embodiments of the present utility model, the dynamic balance tab 13 is formed with a first lightening hole. Specifically, after the dynamic balance sheet 13 is installed, the dynamic balance machine drives the motor rotor to rotate at a high speed to determine the unbalance amount, and then a first lightening hole is drilled on the dynamic balance sheet 13 at the overweight position of the motor rotor to remove the weight, so that the overall dynamic balance of the motor rotor is regulated.
In some embodiments of the present utility model, the motor assembly 1 further includes a locking device sleeved on the motor shaft 11 and disposed at least one end of the rotor core 12 in the axial direction. In one embodiment of the present utility model, the locking device is sleeved on the motor shaft 11 and is disposed at two ends of the rotor core 12 in the axial direction, and the locking device is in interference fit with the motor shaft 11. The locking devices at the two ends of the rotor core 12 in the axial direction are matched with each other to compress the rotor core 12, so that the position of the rotor core 12 on the motor shaft 11 is fixed, the relative movement of the motor shaft 11 and the motor rotor in the rotating process is avoided, namely the axial movement of the motor rotor on the motor shaft 11 in the rotating process is avoided, and the friction between the motor end cover and the end part of the rotor is avoided.
In some embodiments of the present utility model, the locking device includes a first positioning ring 14 and a second positioning ring 15, where the first positioning ring 14 and the second positioning ring 15 are respectively sleeved on the motor shaft 11 and located at two ends of the rotor core 12, and the first positioning ring 14 and the second positioning ring 15 are respectively in interference fit with the motor shaft 11. In one embodiment of the present utility model, the rotor core 12, the first positioning ring 14 and the second positioning ring 15 are all in an interference fit with the motor shaft 11.
During installation, the motor shaft 11 is cooled and contracted, the first positioning ring 14 is sleeved on the motor shaft 11 in a cold-fitting mode, then the rotor core 12 is sleeved on the motor shaft 11, one end of the rotor core 12 in the axial direction is clung to the first positioning ring 14, the rotor core is fixed by using a tool, no gap exists between the first positioning ring 14 and the rotor core 12, the second positioning ring 15 is further sleeved on the motor shaft 11 and clung to the other end of the rotor core 12 in the axial direction, and the rotor core 12 is fixed by using a tool, so that no gap exists between the second positioning ring 15 and the rotor core 12. After the temperature of the motor shaft 11 is recovered, the rotor core 12, the first positioning ring 14 and the second positioning ring 15 are in interference fit with the motor shaft 11, so that no relative movement between the rotor core 12, the first positioning ring 14 and the second positioning ring 15 and the motor shaft 11 is ensured when the rotor core rotates at a high speed, and the situation that gaps are formed between the rotor core 12 and the motor shaft 11 due to certain reasons when the motor shaft 11 rotates at a high speed, so that axial or radial relative position changes between the rotor core 12 and the motor shaft 11 are caused is avoided.
In some embodiments of the present utility model, the motor shaft 11 is formed with a mounting section, and the rotor core 12, the first positioning ring 14 and the second positioning ring 15 are respectively sleeved on the mounting section. Wherein the inner diameter of the rotor core 12 is the same as the inner diameters of the first positioning ring 14 and the second positioning ring 15. In this application, first locating ring 14 and second locating ring 15 are all not fixed, and when cold charge, first locating ring 14 and second locating ring 15 can carry out axial displacement in the axial of motor shaft 11, through all overlapping rotor core 12, first locating ring 14 and second locating ring 15 on the same axle section of motor shaft 11 for when cold charge, can adjust rotor core 12, first locating ring 14 and second locating ring 15 on motor shaft 11's position better, guaranteed when motor stator and rotor are adorned jointly, the centering degree of stator and rotor is higher.
In some embodiments of the present utility model, the outer periphery of the first positioning ring 14 is provided with a plurality of first protrusions 16, each first protrusion 16 being radially distant from the first positioning ring 14 and disposed between two adjacent dynamic balance pieces 13; the outer periphery of the second positioning ring 15 is provided with a plurality of second protruding portions, and each second protruding portion is radially far away from the second positioning ring 15 and is arranged between two adjacent dynamic balance pieces 13. By providing the first protruding portion 16 on the first positioning ring 14 and the second protruding portion on the second positioning ring 15, the contact area between the first positioning ring 14 and the second positioning ring 15 and the rotor core 12 is increased, so that the locking effect of the first positioning ring 14 and the second positioning ring 15 on the rotor core 12 is better. The first and second protruding portions 16 and 13 are disposed between the adjacent two dynamic balance pieces 13, avoiding the arrangement space of the dynamic balance pieces 13, so that the dynamic balance pieces 13 can be uniformly distributed on the rotor core 12.
In some embodiments of the present utility model, the first positioning ring 14 and the second positioning ring 15 are provided with second lightening holes 17, respectively. Wherein the number of the second lightening holes 17 on the first positioning ring 14 is the same as the number of the first protruding parts 16, and the number of the second lightening holes 17 on the second positioning ring 15 is the same as the number of the second protruding parts. By arranging the second lightening holes 17 on the first positioning ring 14 and the second positioning ring 15, the weight of the first positioning ring 14 and the second positioning ring 15 can be lightened, and the situation that the weight of the first positioning ring 14 and the second positioning ring 15 is overlarge due to the fact that the first protruding part 16 is additionally arranged on the first positioning ring 14 and the second protruding part is additionally arranged on the second positioning ring 15, and the rotation of the motor shaft 11 is influenced is avoided.
The vehicle according to the present utility model is briefly described below.
The motor assembly 1 according to any one of the embodiments is arranged on the vehicle according to the present utility model, and since the motor assembly 1 according to any one of the embodiments is arranged on the vehicle according to the present utility model, the driving motor of the vehicle operates more stably, noise, vibration or abnormal sound is not generated during the operation of the motor, and the comfort and safety of running are ensured. Meanwhile, the motor assembly 1 runs stably, has better performance and longer service life, so that frequent maintenance of the motor on the vehicle is not needed, and the market competitiveness of the vehicle is improved.
In the description of the present utility model, it should 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 orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.
In the description of the present utility model, "plurality" means two or more.
In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An electric motor assembly, comprising:
a motor shaft (11),
a rotor core (12), wherein the rotor core (12) is sleeved on the motor shaft (11) and is provided with a first end face and a second end face at two axial ends;
dynamic balance piece (13), dynamic balance piece (13) are constructed to a plurality ofly, a plurality of dynamic balance piece (13) set up in first terminal surface and/or second terminal surface, a plurality of dynamic balance piece (13) are in encircling in motor shaft (11) periphery interval setting.
2. Motor assembly according to claim 1, characterized in that the dynamic balancing piece (13) is configured as a sector or sector ring centered on the axis of the motor shaft (11).
3. The motor assembly according to claim 2, characterized in that an adhesive layer is provided on each dynamic balancing piece (13), and the dynamic balancing pieces (13) are fixed to the first end face or the second end face through the adhesive layer.
4. A motor assembly according to claim 3, wherein the dynamic balancing piece (13) has a first lightening hole formed thereon.
5. The motor assembly of claim 2, further comprising: the locking device is sleeved on the motor shaft (11) and is arranged at least one end of the rotor core (12) in the axial direction.
6. The motor assembly of claim 5, wherein the locking device comprises: the rotor core comprises a motor shaft (11) and rotor cores (12), and is characterized by comprising a first positioning ring (14) and a second positioning ring (15), wherein the first positioning ring (14) and the second positioning ring (15) are respectively sleeved on the motor shaft (11) and positioned at two ends of the rotor cores (12), and the first positioning ring (14) and the second positioning ring (15) are respectively in interference fit with the motor shaft (11).
7. The motor assembly according to claim 6, wherein a mounting section is formed on the motor shaft (11), and the rotor core (12), the first positioning ring (14), and the second positioning ring (15) are respectively sleeved on the mounting section.
8. The motor assembly according to claim 6, characterized in that the outer periphery of the first positioning ring (14) is provided with a plurality of first protrusions (16), each first protrusion (16) being radially distant from the first positioning ring (14) and being arranged between two adjacent dynamic balancing pieces (13);
the periphery of the second positioning ring (15) is provided with a plurality of second protruding parts, and each second protruding part is far away from the second positioning ring (15) along the radial direction and is arranged between two adjacent dynamic balance sheets (13).
9. The motor assembly according to claim 6, characterized in that the first positioning ring (14) and the second positioning ring (15) are provided with second lightening holes (17), respectively.
10. A vehicle comprising the electric machine assembly of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320171848.5U CN219322207U (en) | 2023-02-06 | 2023-02-06 | Motor assembly and vehicle with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320171848.5U CN219322207U (en) | 2023-02-06 | 2023-02-06 | Motor assembly and vehicle with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219322207U true CN219322207U (en) | 2023-07-07 |
Family
ID=87031931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320171848.5U Active CN219322207U (en) | 2023-02-06 | 2023-02-06 | Motor assembly and vehicle with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219322207U (en) |
-
2023
- 2023-02-06 CN CN202320171848.5U patent/CN219322207U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7517155B2 (en) | Resilient mount of uniform stiffness | |
| US6177750B1 (en) | Rotating assembly construction for high speed induction motor | |
| US9948161B2 (en) | Rotor assembly for an electric machine and method for producing a rotor assembly | |
| WO2024001343A1 (en) | Disc-type motor and assembling method therefor, powertrain and vehicle | |
| CN219322207U (en) | Motor assembly and vehicle with same | |
| US11876409B2 (en) | Reinforced rotor for an electric machine | |
| JP7118676B2 (en) | Rotating electric machine | |
| US20200227963A1 (en) | Rotor core of rotating electrical machine | |
| US20070183700A1 (en) | Fluid dynamic bearing system | |
| JP5468237B2 (en) | Electric motor | |
| KR102008300B1 (en) | Wheel hub and wheel bearing assembly comprising same | |
| CN108336846B (en) | Rotor assembly of disk motor and disk motor | |
| US20190093673A1 (en) | Impeller, impeller blade wheel, air-blowing device, and method of manufacturing air-blowing device | |
| CN102209848A (en) | Wind turbine generator | |
| EP0607429B1 (en) | Induction motor of the outer rotor-type | |
| EP1760860B1 (en) | Permanent-magnet rotor for an external-rotor electric motor particularly for washing machines and similar household appliances and manufacturing method thereof | |
| EP1585210B1 (en) | Rotor structure | |
| WO2019213949A1 (en) | Multiple-rotor disc-type generator for railway vehicle, railway vehicle and method for mounting the generator | |
| CN218416153U (en) | Double-stator single-rotor disc type permanent magnet motor | |
| CN220060265U (en) | Magnetic suspension bearing assembly, compressor and heating ventilation equipment | |
| JPH1169674A (en) | Salient pole rotor of electric motor | |
| JP2019054615A (en) | motor | |
| JP2019068622A (en) | Rotary electric machine | |
| CN219554743U (en) | Belt driving motor | |
| CN220628978U (en) | Motor rotor and motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |