CN110676986A - Forming method of magnetic pole protective layer of outer rotor of motor - Google Patents
Forming method of magnetic pole protective layer of outer rotor of motor Download PDFInfo
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- CN110676986A CN110676986A CN201910989148.5A CN201910989148A CN110676986A CN 110676986 A CN110676986 A CN 110676986A CN 201910989148 A CN201910989148 A CN 201910989148A CN 110676986 A CN110676986 A CN 110676986A
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Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
Abstract
The invention discloses a method for forming a magnetic pole protective layer of an outer rotor of a motor, which realizes the glue injection requirement and the automatic separation of a thermal expansion non-metal block and the magnetic pole protective layer after glue injection by utilizing the thermal expansion and cold contraction of the thermal expansion non-metal block, does not need to use auxiliary glue injection components such as a vacuum bag film, demoulding cloth, a flow guide net and the like, simplifies the preparation process before glue injection, greatly reduces the workload, and can shorten the glue injection period; in addition, the forming method of the invention controls the pressure between the thermal expansion non-metal block and the interior of the annular component, so that the magnetic pole protective layer is more compact and the solid heat transfer speed is high, the high-quality magnetic pole protective layer can be formed only by one-time glue injection, and the production period is further shortened. Moreover, the non-metallic piece of thermal expansion breaks away from with the magnetic pole inoxidizing coating nature after the injecting glue is accomplished, and the non-metallic piece surface of thermal expansion does not have nearly residue resin, and the danger waste material that significantly reduces is favorable to the environmental protection when reduce cost.
Description
Technical Field
The invention relates to the technical field of motor rotor magnetic pole protection, in particular to a forming method of a motor outer rotor magnetic pole protection layer.
Background
The permanent magnet motor is an electromagnetic device which performs mutual conversion between mechanical energy and electric energy by taking a magnetic field as a medium, and is widely applied to various power generation places. The magnetism of the permanent magnet material of the permanent magnet motor is one of important factors influencing the power generation performance of the permanent magnet motor.
The permanent magnet motor comprises a rotor body, pressing strips, magnetic pole parts and the like, wherein the rotor body is generally cylindrical, the prefabricated pressing strips are installed on the inner peripheral wall of the rotor by using fasteners such as bolts, the magnetic pole parts are pushed to corresponding positions between the adjacent pressing strips along the axial direction after the positions of the pressing strips are fixed, the cross sections of the pressing strips are generally trapezoidal, namely, two side walls of the pressing strips are trapezoidal inclined planes, and the magnetic pole parts are limited in a trapezoidal space formed by the adjacent pressing strips along the radial direction. The magnetic pole part is made of permanent magnetic material, the main component of the permanent magnetic material is neodymium iron boron, iron and neodymium in the neodymium iron boron are easy to oxidize, and magnetic property changes are caused, so in order to avoid influence of external environment on the magnetic property of the magnetic pole part as much as possible, a protective coating is generally poured on the surface of the magnetic pole part, and specific processes are described in detail below.
Firstly, a vacuum bag is installed on the inner wall of the magnetic yoke wall, the vacuum bag and the magnetic yoke wall form a mold cavity, a pressing strip and a magnetic pole part are coated in the mold cavity, and generally, in order to facilitate subsequent demolding and glue injection uniformity, parts such as demolding cloth and a flow guide net need to be laid. Secondly, the die cavity is vacuumized by a vacuum pump so that the reinforcing material is compacted on the surfaces of the pressing strip and the magnetic pole part, residual air between the surface of the magnetic pole part and the wall surface of the magnetic yoke is led out, then adhesive (resin) is poured into the die cavity in a vacuum mode, the resin enters from one end of the die cavity and flows to the other end along the axial direction, meanwhile, the fiber reinforcing material is soaked, gaps between the magnetic pole part and the wall of the magnetic yoke, gaps between the magnetic pole part and the pressing strip, the pressing strip and the surface of the magnetic pole part are filled, after the adhesive is filled in the whole die cavity, the gaps and the gaps, the resin-based reinforcing material protective covering layer is formed by soaking and impregnating the contact surface.
The usage amount of laying the membrane removing cloth, the flow guide net and the vacuum bag in the existing glue injection process is large, the workload is correspondingly large, and glue liquid is wasted when being retained on the surface of each part.
In view of this, how to reduce the molding workload of the magnetic pole protective layer and reduce the waste of glue solution is a problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a method for forming a magnetic pole protective layer in a motor rotor assembly, which comprises the following steps:
assembling parts at least comprising a magnetic pole part, a pressing bar and a rotor to form an outer rotor annular assembly;
placing a thermal expansion non-metal block in the inner ring of the annular assembly, wherein an annular gap is formed between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block;
arranging the lower end of the annular gap to form a glue injection port for communicating with glue injection equipment, and arranging the other end of the annular gap to form an exhaust port for communicating with vacuum pumping equipment;
heating the annular assembly and the thermal expansion non-metal block to a glue injection temperature, controlling the glue injection equipment to inject glue between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block, and simultaneously controlling the vacuum pumping equipment to vacuumize the annular gap;
after the glue injection is finished and the magnetic pole protective layer is formed through solidification, the thermal expansion nonmetal block and the annular assembly with the magnetic pole protective layer are cooled to a preset temperature, so that the outer wall of the thermal expansion nonmetal block is separated from the formed magnetic pole protective layer.
The forming method of the magnetic pole protective layer in the motor rotor assembly realizes the glue injection requirement and the automatic separation of the thermal expansion non-metal block and the magnetic pole protective layer after glue injection by utilizing the thermal expansion and cold contraction of the thermal expansion non-metal block, does not need auxiliary glue injection components such as a vacuum bag film, demoulding cloth, a flow guide net and the like, simplifies the preparation process before glue injection, greatly reduces the workload, and can shorten the glue injection period; in addition, the forming method of the invention controls the pressure between the thermal expansion non-metal block and the interior of the annular component, so that the magnetic pole protective layer is more compact and the solid heat transfer speed is high, the high-quality magnetic pole protective layer can be formed only by one-time glue injection, and the production period is further shortened. Moreover, the non-metallic piece of thermal expansion breaks away from with the magnetic pole inoxidizing coating nature after the injecting glue is accomplished, and the non-metallic piece surface of thermal expansion does not have nearly residue resin, and the danger waste material that significantly reduces is favorable to the environmental protection when reduce cost.
Optionally, the thermally expansive nonmetal has the following properties: at normal temperature, an annular gap is formed between the inner surface of the annular assembly to be injected with glue and the thermal expansion nonmetal block; and when the glue injection temperature is high, the thermal expansion nonmetal blocks expand and apply certain pressure on the inner wall of the annular assembly so as to meet the glue injection requirement.
Optionally, the configuration of the exhaust port specifically includes: sealing the upper end part of the annular gap by using a sealing film, and then opening the exhaust port on the sealing film; wherein the upper end of the annular gap is the top of the magnetic pole part of the rotor close to the side of the nacelle.
Optionally, before the thermally-expansible non-metallic block is placed on the inner ring of the annular component, a release agent is further coated on the outer surface of the thermally-expansible non-metallic block.
Optionally, the thermally expansive non-metallic block comprises one or more of tetrafluoroethylene, modified nylon, or polyethylene.
Optionally, the coefficient of friction of the outer surface of the thermally-expansible non-metallic block ranges from 0.015 to 0.2.
Optionally, the annular assembly and the thermal expansion non-metal block are heated to a glue injection temperature, and before glue injection, a pressure value range between the annular assembly and the thermal expansion non-metal block is as follows: 0.1-0.2 MPa.
Optionally, the annular assembly and the thermally expandable non-metallic block are maintained at the glue injection temperature for a predetermined time period for baking, and the pressure value between the annular assembly and the thermally expandable non-metallic block is maintained at: 0.1-0.2 MPa.
Optionally, during glue injection, the glue solution is filled upwards from the lower portion of the annular gap, and a predetermined pressure is applied to a pipeline through which the glue solution is transmitted to the glue injection port, where the predetermined pressure is greater than a gravity value of resin filled into the annular gap.
Optionally, the time for filling the glue solution is controlled within 10 minutes.
Optionally, at room temperature, the distance between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block is 6mm-10 mm.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for forming a magnetic pole protection layer of an outer rotor of an electric motor according to a first embodiment of the present invention;
fig. 2 is a flow chart of a method for forming a magnetic pole protective layer of an outer rotor of an electric machine provided by the invention.
Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:
1-a rotor; 2-thermal expansion non-metallic block.
Detailed Description
The core of the invention is to provide a forming method of a magnetic pole protective layer in a motor rotor assembly, which can reduce the forming workload of the magnetic pole protective layer and greatly reduce the waste of glue solution.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic flow chart illustrating a forming method of a magnetic pole protection layer of an outer rotor of an electric machine according to a first embodiment of the present invention; fig. 2 is a flow chart of a method for forming a magnetic pole protective layer of an outer rotor of an electric machine provided by the invention.
The motor rotor assembly provided by the invention at least comprises a rotor 1, a magnetic pole part, a pressing strip and other parts. The rotor 1 herein mainly refers to an outer rotor 1, the beads can be generally mounted on the inner peripheral wall of the rotor 1 by using fasteners such as bolts, etc., after the beads are fixed, the magnetic pole parts are pushed to the corresponding positions between the adjacent beads along the axial direction, and the magnetic pole parts are made of permanent magnetic materials, usually magnetic steel.
Usually, in order to increase the strength of the magnetic pole protective layer, a layer of fiber reinforced material is laid on the surfaces of the pressing strips and the magnetic steel.
The forming method of the magnetic pole protective layer of the outer rotor of the motor comprises the following steps:
s1, assembling parts at least comprising a magnetic pole part, a pressing bar and the rotor 1 to form an outer rotor annular assembly;
as mentioned above, the ring assembly is exemplified in this application as an outer rotor of an electric machine, and the components forming the ring assembly may further comprise a fiber reinforcement material, such as a fiberglass cloth.
S2, placing the thermal expansion non-metal block 2 in the inner ring of the annular assembly, and forming an annular gap between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block 2;
in a preferred embodiment, the non-metallic, thermally expansive block 2 has the following characteristics: at normal temperature, an annular gap is formed between the inner surface of the annular assembly to be injected with glue and the thermal expansion nonmetal block; when being at the injecting glue temperature, thermal energy nonmetal piece 2 expands to apply certain pressure in order to satisfy the injecting glue demand in annular assembly inner wall.
The expansion of the thermal expansion non-metal block 2 is a material with high thermal expansion coefficient, and the requirements of the glue injection process are met by the following performance characteristics:
the temperature resistance level of the first and thermal expansion non-metal block 2 meets the high temperature requirement in the process, for example, the highest temperature in the forming process of the magnetic pole protective layer is 65 ℃, so that the thermal expansion non-metal block 2 needs to be able to withstand the temperature and not to be obviously aged in the temperature environment. Of course, the highest temperature in the molding process of the magnetic pole protective layer of different motor rotor assemblies may be different, and the performance parameters of the thermal expansion non-metal block 2 may also be different, and the material of the thermal expansion non-metal block 2 meeting the actual application conditions is selected according to the actual needs of the product and the process.
The coefficient of thermal expansion of the second, thermally expansive non-metallic block 2 should satisfy: at normal temperature, the first preset distance between the thermal expansion nonmetal block 2 and the annular assembly can enable the thermal expansion nonmetal block 2 to be placed in an inner ring of the annular assembly, and when the thermal expansion nonmetal block is at the glue injection temperature, the thermal expansion nonmetal block 2 expands to apply certain pressure on the inner wall of the annular assembly so as to meet the glue injection requirement;
typically, the thermal expansion coefficient of a typical metal is 1.2 x 10-5About/k, the material needs to satisfy more than 8-10 times of the expansion coefficient of the metal through research and verification, so that the ring is installed in the non-expansion state of the materialThe inner ring of the assembly is easy to control the pressure between the expanded inner ring and the inner wall of the rotor 1, and the shrinkage is large during cooling shrinkage, so that the assembly is convenient to dismount.
And S3, configuring the lower end of the annular gap to form a glue injection port for communicating with glue injection equipment, and configuring the other end of the annular gap to form an exhaust port for communicating with vacuum pumping equipment.
Specifically, the configuration of the exhaust port may include: sealing the upper end of the annular gap by using a sealing film, and then forming an exhaust port on the sealing film; wherein the upper end of the annular gap is preferably the top of the rotor 1 near the nacelle-side pole part.
Correspondingly, the glue injection opening is formed in the bottom of the annular gap.
Preferably, injecting glue is carried out when rotor 1 is placed vertically, that is to say, rotor 1 axial is vertical direction, and during injecting glue, the glue solution flows in from the injecting glue mouth of rotor 1 bottom, fills the annular gap from bottom to top and forms the magnetic pole inoxidizing coating. The magnetic pole protective layer formed in the way is high in quality, the internal gap of the magnetic pole protective layer is greatly reduced, and meanwhile, the corrosion of external water vapor or other corrosive gases can be avoided when the magnetic pole protective layer is used.
S4, heating the annular assembly and the thermal expansion non-metal block 2 to a glue injection temperature, controlling glue injection equipment to inject glue between the inner surface of the annular assembly to be injected with the glue and the thermal expansion non-metal block 2, and controlling vacuum pumping equipment to vacuumize the annular gap.
The vacuum-pumping equipment is not described in detail here, and is a mature equipment in the prior art.
When filling the glue solution, need control to fill the time of filling the glue solution, the time is too short, and then the glue solution rising speed is too fast, can lead to wrapping up in the glue solution bubble, influences the protective effect after the solidification, and the time overlength, then the glue solution can begin the cross-linking reaction, and glue solution viscosity increases, gives off the heat, and the heat can further promote the glue solution cross-linking solidification, leads to the glue solution to fill and annotate the difficulty, fills and annotate incompletely, so preferred, the time of control filling the glue solution is 8 minutes-12 minutes.
And S5, after the glue injection is finished and the magnetic pole protective layer is formed through solidification, cooling the thermal expansion nonmetal block 2 and the annular assembly with the magnetic pole protective layer to a preset temperature so as to separate the outer wall of the thermal expansion nonmetal block 2 from the formed magnetic pole protective layer.
That is, the non-metallic thermal expansion block 2 of the present invention shrinks and can be detached from the pole shield when the temperature is lowered.
In a preferred embodiment, in order to enable the thermal expansion non-metal block 2 to be smoothly separated from the magnetic pole protection layer, a mold release agent can be coated on the outer surface of the thermal expansion non-metal block 2 before the thermal expansion non-metal block 2 is placed on the inner ring of the annular assembly. The release agent can be in the form of paste or liquid as long as the formation of the magnetic pole protective layer is not affected and the thermal expansion nonmetal block 2 is smoothly separated from the magnetic pole protective layer.
In another embodiment, the lower the friction coefficient of the outer surface of the thermal expansion non-metal block 2 is, the easier the thermal expansion non-metal block 2 is to be separated from the magnetic pole protective layer, and in the outer rotor glue injection process applied to the present application, it is verified through research that the friction coefficient of the outer surface of the thermal expansion non-metal block 2 is preferably in the range of 0.015 to 0.2.
In the above embodiments, the thermally expandable non-metallic block 2 includes one or more of tetrafluoroethylene, modified nylon, or polyethylene.
It should be noted that the room temperature herein is about 20 ℃ to 22 ℃. When the temperature is room temperature, the distance between the inner surface of the annular assembly to be injected with glue and the thermal expansion nonmetal block 2 is 6-10 mm, and the gap distance can simplify the previous sleeving process of the tool and the operation of cooling and taking out the thermal expansion nonmetal block 2.
Because the expansion coefficients and the sizes of different tool materials are different, the gap values of the sizes of the thermal expansion non-metal block 2 and the rotor 1 are also different, some adjustment is needed according to different materials, and the tool size is changed along with the size of the rotor 1; and increase the sealing function that one or more O type sealing washer is as the metal contact surface at the non-metallic block 2 of thermal energy's periphery wall, after the non-metallic block 2 of thermal energy is heated the inflation, O type sealing washer can be used to the supplementary sealing effect to the annular gap to can also block the outside outflow of protective resin, O type sealing washer placing position is confirmed according to the lowest position of injecting glue, and the optimal bottom that can arrange at the non-metallic block 2 periphery wall of thermal energy.
In a preferred implementation mode, when injecting glue in the above embodiments, the glue solution is filled from the lower part of the annular gap upwards, and a predetermined pressure is applied to the pipeline for conveying the glue solution to the glue injection port, wherein the predetermined pressure is greater than the gravity value of the resin filled in the annular gap.
In a particular rotor 1 glue injection process, the predetermined pressure of glue injection results in a pressure of approximately 2 standard atmospheres. Of course, the predetermined pressure may be adjusted for different rotors 1.
Thus, the flow force of the glue solution can be increased to form the high-quality magnetic pole protective layer.
Heating the annular assembly and the thermal expansion non-metal block 2 to the glue injection temperature, wherein before glue injection, the pressure value range between the annular assembly and the thermal expansion non-metal block 2 is as follows: 0.1-0.2 MPa.
Specifically, before the glue injection, the ring assembly and the thermally expanding non-metallic block 2 will be baked for a predetermined period of time while being maintained at the glue injection temperature, during which the pressure value between the ring assembly and the thermally expanding non-metallic block 2 is maintained at: 0.1-0.2 MPa. Thus, the thermal expansion nonmetal block 2 and the annular component are uniformly heated and are uniformly contacted, and the forming quality of the magnetic pole protective layer is facilitated.
The predetermined time period for baking may be selected according to parameters such as the size of the rotor 1, the heat capacity of the rotor 1, and the thermal expansion rate of the thermally expanded nonmetal, and is usually 2 hours to 3 hours, which is not limited to the above description. The predetermined period of baking is primarily to allow the thermally expansive non-metal to exert a certain pressure or pressure on the inner wall of the annular assembly.
As can be seen from the above description, the method for forming the magnetic pole protective layer in the motor rotor assembly provided by the invention realizes the glue injection requirement and the automatic separation of the thermally expanded non-metal block 2 from the magnetic pole protective layer after glue injection by using the thermal expansion and cold contraction of the thermally expanded non-metal block 2, and does not need to use auxiliary glue injection components such as a vacuum bag film, demolding cloth, a flow guide net and the like, thereby simplifying the preparation process before glue injection, greatly reducing the workload, and shortening the glue injection period; in addition, the forming method of the invention controls the pressure between the thermal expansion non-metal block 2 and the interior of the annular component, so that the magnetic pole protective layer is more compact and the solid heat transfer speed is high, the high-quality magnetic pole protective layer can be formed only by one-time glue injection, and the production period is further shortened. Moreover, the nonmetal piece of thermal expansion 2 breaks away from with the magnetic pole inoxidizing coating nature after the injecting glue is accomplished, and the nonmetal piece of thermal expansion 2 surface does not have nearly residue resin, and the danger waste material that significantly reduces is favorable to the environmental protection when reduce cost.
The forming method of the magnetic pole protective layer in the motor rotor assembly provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (11)
1. A forming method of a magnetic pole protective layer of an outer rotor of a motor is characterized by comprising the following steps:
assembling parts at least comprising a magnetic pole part, a pressing bar and a rotor to form an outer rotor annular assembly;
placing a thermal expansion non-metal block in the inner ring of the annular assembly, wherein an annular gap is formed between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block;
arranging the lower end of the annular gap to form a glue injection port for communicating with glue injection equipment, and arranging the other end of the annular gap to form an exhaust port for communicating with vacuum pumping equipment;
heating the annular assembly and the thermal expansion non-metal block to a glue injection temperature, controlling the glue injection equipment to inject glue between the inner surface of the annular assembly to be injected with glue and the thermal expansion non-metal block, and simultaneously controlling the vacuum pumping equipment to vacuumize the annular gap;
after the glue injection is finished and the magnetic pole protective layer is formed through solidification, the thermal expansion nonmetal block and the annular assembly with the magnetic pole protective layer are cooled to a preset temperature, so that the outer wall of the thermal expansion nonmetal block is separated from the formed magnetic pole protective layer.
2. The method for forming a magnetic pole protection layer of an external rotor of an electric machine of claim 1, wherein the thermally expandable nonmetal has the following properties: at normal temperature, an annular gap is formed between the inner surface of the annular assembly to be injected with glue and the thermal expansion nonmetal block; and when the glue injection temperature is high, the thermal expansion nonmetal blocks expand and apply certain pressure on the inner wall of the annular assembly so as to meet the glue injection requirement.
3. The method for forming a magnetic pole protective layer of an external rotor of an electric machine of claim 2, wherein the configuration of the air outlet specifically comprises: sealing the upper end part of the annular gap by using a sealing film, and then opening the exhaust port on the sealing film; wherein the upper end of the annular gap is the top of the magnetic pole part of the rotor close to the side of the nacelle.
4. The method for forming a magnetic pole protective layer of an external rotor of an electric machine of claim 1, wherein a release agent is further coated on the outer surface of the thermally expanded non-metallic block before the thermally expanded non-metallic block is placed on the inner ring of the annular component.
5. The method for forming the magnetic pole protective layer of the outer rotor of the motor of claim 1, wherein the thermal expansion nonmetal blocks comprise one or more of tetrafluoroethylene, modified nylon or polyethylene.
6. The method for forming the magnetic pole protective layer of the external rotor of the motor as claimed in claim 1, wherein the friction coefficient of the outer surface of the thermal expansion non-metallic block is in the range of 0.015 to 0.2.
7. The method for forming the magnetic pole protective layer of the external rotor of the motor of claim 1, wherein the annular assembly and the thermal expansion non-metallic block are heated to a glue injection temperature, and before glue injection, a pressure value range between the annular assembly and the thermal expansion non-metallic block is as follows: 0.1-0.2 MPa.
8. The method for forming an external rotor magnetic pole protective layer of an electric machine of claim 7, wherein the ring assembly and the thermally expandable non-metallic block are baked while being maintained at the compound injection temperature for a predetermined period of time, and a pressure value between the ring assembly and the thermally expandable non-metallic block is maintained at: 0.1-0.2 MPa.
9. The forming method of the magnetic pole protective layer of the outer rotor of the motor in claim 1, wherein glue is filled from the lower portion of the annular gap upwards during glue injection, and a predetermined pressure is applied to a pipeline through which the glue is transmitted to the glue injection port, wherein the predetermined pressure is greater than a gravity value of the resin filled into the annular gap.
10. The forming method of the magnetic pole protective layer of the outer rotor of the motor disclosed by claim 9, wherein the time for filling the glue solution is controlled within 10 minutes.
11. The forming method of the magnetic pole protective layer of the external rotor of the motor disclosed by claim 1, wherein the distance between the inner surface of the annular component to be injected with glue and the thermal expansion non-metallic block is 6mm to 10mm at room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910989148.5A CN110676986B (en) | 2019-10-17 | 2019-10-17 | Forming method of magnetic pole protective layer of motor outer rotor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910989148.5A CN110676986B (en) | 2019-10-17 | 2019-10-17 | Forming method of magnetic pole protective layer of motor outer rotor |
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| CN110676986A true CN110676986A (en) | 2020-01-10 |
| CN110676986B CN110676986B (en) | 2024-02-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110676986B (en) | 2024-02-27 |
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