CN111342578A - Rotor structure of permanent magnet synchronous motor - Google Patents
Rotor structure of permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN111342578A CN111342578A CN202010292673.4A CN202010292673A CN111342578A CN 111342578 A CN111342578 A CN 111342578A CN 202010292673 A CN202010292673 A CN 202010292673A CN 111342578 A CN111342578 A CN 111342578A
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- permanent magnet
- rotor
- synchronous motor
- magnet synchronous
- framework
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 30
- 238000004512 die casting Methods 0.000 claims abstract description 8
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 2
- 230000003449 preventive effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The application discloses a rotor structure of a permanent magnet synchronous motor. The rotor structure of the permanent magnet synchronous motor comprises: the rotor comprises a rotor shaft, a rotor framework and a permanent magnet; the rotor framework is a cylindrical structure which is longitudinally provided with a permanent magnet groove and is formed by non-magnetic-conductive material through die casting, the permanent magnet is embedded and inserted in the permanent magnet groove, the rotor framework is provided with a shaft hole which is embedded in the rotor shaft along the central shaft, a weight-reducing through hole is formed between the permanent magnet groove and the shaft hole, and fixing pieces used for fixing the permanent magnet are arranged at two ends of the rotor framework. The motor has the technical effects of light weight, low noise and high motor efficiency, and solves the technical problem of low transmission efficiency of the motor.
Description
Technical Field
The application relates to the technical field of motors, in particular to a rotor structure of a three-phase alternating-current permanent magnet synchronous motor.
Background
The permanent magnet synchronous motor has the advantages of small volume, high reliability, high power density, high torque density and the like, and is widely applied.
At present, permanent magnets are embedded in a rotor of a permanent magnet synchronous motor to improve the efficiency and power factor of the motor. The closed magnetic circuit of the permanent magnet is divided into two parts, one part forms the closed magnetic circuit through the rotor core, namely the magnetic circuit of magnetic leakage, the other part forms the closed magnetic circuit through the stator core, and the more the magnetic force lines passing through the stator core, the higher the utilization rate of the permanent magnet is. The conventional permanent magnet synchronous motor rotor is provided with partitions between the slot wings, but if the partition width between the slot wings is wider, the magnetic leakage is larger, the permanent magnet material is wasted, the cost is increased, the narrower the partition width is, the mechanical strength of the part on the punching sheet is weaker, and when the rotor runs at a high speed for a long time, the punching sheet of the part is broken under the action of centrifugal force and electromagnetic force during running, so that the running of the motor rotor is influenced. The strength of a rotor core of the existing permanent magnet motor is difficult to guarantee on the premise of guaranteeing small magnetic flux leakage.
The invention can effectively improve the strength of the rotor, reduce the weight of the rotor, improve the efficiency of the motor, reduce the magnetic slot effect, have low noise and avoid the defect of eddy current loss of the rotor in an alternating magnetic field.
Disclosure of Invention
The main objective of the present application is to provide a rotor structure of a permanent magnet synchronous motor to solve the technical problems of heavy rotor mass and low motor rotation efficiency.
In order to achieve the above object, according to one aspect of the present application, there is provided a rotor structure of a permanent magnet synchronous motor. The rotor structure of the permanent magnet synchronous motor comprises: the rotor comprises a rotor shaft, a rotor framework and a permanent magnet; the rotor framework is a cylindrical structure which is longitudinally provided with a permanent magnet groove and is formed by non-magnetic-conductive material through die casting, the permanent magnet is embedded and inserted in the permanent magnet groove, the rotor framework is provided with a shaft hole which is embedded in the rotor shaft along the central shaft, a weight-reducing through hole is formed between the permanent magnet groove and the shaft hole, and fixing pieces used for fixing the permanent magnet are arranged at two ends of the rotor framework. The permanent magnet groove is matched with the permanent magnet in shape; the permanent magnet can be clamped at the opening of the permanent magnet groove, and the permanent magnet is fixed at two ends of the permanent magnet by fixing pieces, so that the permanent magnet is prevented from falling. The weight reduction through holes can reduce the whole weight of the rotor, the technical scheme has light weight, reduces the magnetic slot effect, has low noise, avoids the defect of eddy loss of the rotor in an alternating magnetic field, and obtains the high-efficiency permanent magnet rotor of the synchronous motor.
Preferably, fastening screw holes are formed in two ends of the rotor frame, and the fixing piece is fixed in the fastening screw holes of the rotor frame through the fastening screws. The fastening screw holes are uniformly distributed on the rotor framework.
Preferably, the fixing piece is annular.
Preferably, the weight-reducing through holes are more than two weight-reducing through holes uniformly formed along the axial direction (i.e. the longitudinal direction) of the cylinder. The direction of the weight-reducing through hole is parallel to the direction of the shaft hole.
Preferably, the rotor frame is formed by die-casting an aluminum alloy material or a carbon fiber material. The rotor framework formed by pressing the aluminum alloy material generates very small amount of eddy current in the alternating magnetic field; the carbon fiber material is formed by die casting, does not generate eddy current phenomenon in an alternating magnetic field, and has very light weight. The cost is low, and the manufacture is easy.
Preferably, the permanent magnet is a permanent magnet made of one of iron oxide, samarium cobalt and sintered neodymium iron boron.
Preferably, the surfaces of the rotor framework, the fixing pieces and the permanent magnets are coated with anti-rust layers. The permanent magnets can be integrated or spliced. The optimal permanent magnet should be one piece. And performing surface coating anti-rust treatment on the optimal nickel plating, zinc plating or paint spraying of the permanent magnet anti-rust layer. Ensuring long service life. The fastening screw is provided with a screw cap and a threaded rod, in order to prolong the service life, the fastening screw should be subjected to rust-proof treatment, and the surface of the fastening screw should be provided with a rust-proof coating.
Preferably, the number of the permanent magnet grooves is 4-32, and the number of the fastening screw holes is 3-8.
In the application, a non-magnetic-conductive material is adopted to form the rotor framework in a die-casting mode, the non-magnetic-conductive rotor framework is provided with the permanent magnet grooves, and the permanent magnets are embedded into the permanent magnet grooves.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is an exploded view of a rotor structure of a permanent magnet synchronous motor according to the present application;
fig. 2 is an assembled perspective view of the components of a rotor structure of a permanent magnet synchronous motor according to the present application;
fig. 3 is a perspective view of a rotor frame of a rotor structure of a permanent magnet synchronous motor according to the present application;
fig. 4 is a perspective view of a rotor shaft of a rotor structure of a permanent magnet synchronous motor according to embodiment 1 of the present application after being assembled to a rotor frame;
fig. 5 is a schematic diagram of a permanent magnet structure of a rotor structure of a permanent magnet synchronous motor according to embodiment 1 of the present application;
fig. 6 is a left side view of a rotor structure of a permanent magnet synchronous motor according to embodiment 1 of the present application;
wherein the reference numerals in the figures denote: 1. a rotor shaft; 2. a rotor frame; 21. a permanent magnet slot; 22. a weight-reducing through hole; 23. fastening a screw hole; 24. a shaft hole; 3. a permanent magnet; 4. a fixing sheet; 41. fixing piece through hole 5 and fastening screw.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be understood that the terms "comprises" and "comprising" in the description and claims of this application and in the above-described drawings are intended to cover non-exclusive inclusions, and that the specific meanings of such terms in the application will be understood by those skilled in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Fig. 1-3 are schematic structural views of 6 permanent magnet slots, according to the technical solution and fig. 1-3, a rotor structure of a 112M-8 permanent magnet synchronous motor with 8 permanent magnet slots 21, 8 permanent magnets 3, 8 stages of permanent magnets and 4 fastening screw holes 23 is manufactured, a state diagram of a rotor shaft installed on a rotor frame is shown in fig. 4, fig. 5 is a structure diagram of permanent magnets, fig. 6 is a left side view of a rotor structure, a rotor frame 2 is a die-cast cylindrical structure with permanent magnet slots longitudinally formed in a non-magnetic conductive material, 8 permanent magnet slots 21 with the same shape are uniformly arranged in the permanent magnet slots, the permanent magnets are embedded in the permanent magnet slots, the center of the cylinder structure is provided with a shaft hole 24 for nesting the rotor shaft, a weight-reducing through hole 22 is arranged between the permanent magnet groove and the shaft hole, and both ends of the rotor framework are provided with fixing pieces 4 for fixing the permanent magnet. The permanent magnet groove is matched with the permanent magnet in shape; the permanent magnet can be clamped at the opening of the permanent magnet groove, and the permanent magnet is fixed at two ends of the permanent magnet by fixing pieces 4 respectively, so that the permanent magnet is prevented from falling. The weight reduction through holes can reduce the whole weight of the rotor, the rotor structure is light in weight, the magnetic slot effect can be reduced, the noise is low, the defect of eddy loss of the rotor in an alternating magnetic field is avoided, and the high-efficiency permanent magnet rotor of the synchronous motor is obtained.
Fastening screw holes 23 are formed in the two ends of the rotor framework, and the fixing piece is fixed in the fastening screw holes of the rotor framework through fastening screws 5. The fastening screw holes are uniformly distributed on the rotor framework. The fixing piece is annular. The weight-reducing through holes are formed by arranging 12 weight-reducing through holes along the axial direction of the cylinder. The fixing piece is also provided with a fixing piece through hole 41 for fixing the fixing piece on the rotor framework after the fastening screw rod passes through.
The rotor framework is formed by die-casting an aluminum alloy material. The rotor framework formed by pressing the aluminum alloy material has the advantages of very small quantity of eddy currents generated in the alternating magnetic field, low cost, convenient material taking and easy manufacture. The permanent magnet is made of sintered neodymium iron boron. The surfaces of the rotor framework, the stator and the permanent magnet are coated with anti-rust layers. The permanent magnet is integrated. And (4) brushing the optimal antirust paint on the permanent magnet antirust layer to perform surface coating antirust treatment. Ensuring long service life. The fastening screw is provided with a screw cap and a threaded rod, in order to prolong the service life, the fastening screw should be subjected to rust-proof treatment, and the surface of the fastening screw should be provided with a rust-proof coating.
The permanent magnet synchronous motor with the rated output power of 1.8KW and the number of stages of 8, which is manufactured by the rotor structure of the 112M-8 permanent magnet synchronous motor manufactured by the embodiment; through detection, the final detection result is that the efficiency is 92.8%.
International Electrotechnical Commission (IEC) ultra high efficiency (IE3) three-phase ac motor standards are as follows:
| kilowatt of output power | 8 polar efficiency (%) |
| 0.75 | 75.0 |
| 1.1 | 77.7 |
| 1.5 | 79.7 |
| 2.2 | 81.9 |
| 3 | 83.5 |
| 4 | 84.8 |
| 5.5 | 86.2 |
| 7.5 | 87.3 |
| 11 | 88.6 |
| 15 | 89.6 |
| 18.5 | 90.1 |
| 22 | 90.6 |
| 30 | 91.3 |
| 37 | 91.8 |
| 45 | 92.2 |
| 55 | 92.5 |
As can be seen from the table, the energy efficiency standard value of the ultra-high efficiency (IE3)1.8Kw, 8-pole three-phase alternating-current motor should be between 79.7% and 81.9%.
The efficiency of the 1.8KW and 8-pole three-phase alternating current motor manufactured by the technology is 92.8 percent, which is far greater than 79.7 to 81.9 percent of ultra-high efficiency, and even greater than 92.5 percent of the efficiency of 55KW and 8-pole three-phase alternating current motors with ultra-high efficiency grades, so the technical scheme has unexpected technical effects of light weight and high efficiency.
In this embodiment 1, a non-magnetic conductive material is used to form a rotor frame by die-casting, a permanent magnet slot is formed in the non-magnetic conductive rotor frame, and a permanent magnet is embedded in the permanent magnet slot, so that a new rotor frame is used, and especially a plurality of weight-reducing through holes are formed, which can better reduce the weight of the overall structure of the rotor, thereby achieving the beneficial effects of light weight, low noise and high motor efficiency, and further solving the technical problems of heavy rotor mass, high eddy current loss and low motor rotation efficiency caused by the unreasonable overall structure of the rotor.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A rotor structure of a permanent magnet synchronous motor, comprising: the rotor comprises a rotor shaft (1), a rotor framework (2) and a permanent magnet (3); the rotor framework is a cylindrical structure which is longitudinally provided with a permanent magnet groove (21) and is formed by non-magnetic-conductive material through die casting, the permanent magnet (3) is embedded and inserted in the permanent magnet groove, the rotor framework is provided with a shaft hole (24) which is embedded with the rotor shaft along the central shaft, a weight-reducing through hole (22) is arranged between the permanent magnet groove and the shaft hole, and fixing pieces (4) used for fixing the permanent magnet are arranged at the two ends of the rotor framework.
2. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein fastening screw holes (23) are formed at both ends of the rotor frame, and the stator is fixed in the fastening screw holes (23) of the rotor frame by fastening screws (5).
3. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the stator (4) is annular.
4. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the weight-reducing through holes (22) are two or more weight-reducing through holes uniformly opened along the axial direction of the cylinder.
5. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the rotor frame (2) is die-cast from an aluminum alloy material or a carbon fiber material.
6. Rotor structure of a permanent-magnet synchronous motor according to claim 1, characterized in that the permanent magnets (3) are permanent magnets made of one of iron oxide, samarium cobalt, sintered neodymium iron boron.
7. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the surfaces of the rotor frame, the stator, and the permanent magnet are coated with a rust preventive layer.
8. The rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the number of the permanent magnet slots (21) is 4-32, and the number of the fastening screw holes (23) is 3-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010292673.4A CN111342578A (en) | 2020-04-15 | 2020-04-15 | Rotor structure of permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010292673.4A CN111342578A (en) | 2020-04-15 | 2020-04-15 | Rotor structure of permanent magnet synchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN111342578A true CN111342578A (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010292673.4A Pending CN111342578A (en) | 2020-04-15 | 2020-04-15 | Rotor structure of permanent magnet synchronous motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124833A1 (en) * | 2021-12-31 | 2023-07-06 | 深圳先进技术研究院 | Electric motor rotor without outer magnetic bridge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635479A (en) * | 2008-07-24 | 2010-01-27 | 李明山 | Permanent-magnetic rotor for alternating current motor |
| CN105141098A (en) * | 2015-09-21 | 2015-12-09 | 华晨汽车集团控股有限公司 | Switched reluctance motor with segmental rotor |
| CN206908457U (en) * | 2017-04-18 | 2018-01-19 | 快意电梯股份有限公司 | Internal rotor permanent-magnetic synchro traction machine |
| CN211405638U (en) * | 2020-04-15 | 2020-09-01 | 崔明花 | Rotor structure of permanent magnet synchronous motor |
-
2020
- 2020-04-15 CN CN202010292673.4A patent/CN111342578A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635479A (en) * | 2008-07-24 | 2010-01-27 | 李明山 | Permanent-magnetic rotor for alternating current motor |
| CN105141098A (en) * | 2015-09-21 | 2015-12-09 | 华晨汽车集团控股有限公司 | Switched reluctance motor with segmental rotor |
| CN206908457U (en) * | 2017-04-18 | 2018-01-19 | 快意电梯股份有限公司 | Internal rotor permanent-magnetic synchro traction machine |
| CN211405638U (en) * | 2020-04-15 | 2020-09-01 | 崔明花 | Rotor structure of permanent magnet synchronous motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124833A1 (en) * | 2021-12-31 | 2023-07-06 | 深圳先进技术研究院 | Electric motor rotor without outer magnetic bridge |
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