CN113794299B - Rotor subassembly, motor, compressor, air conditioner - Google Patents
Rotor subassembly, motor, compressor, air conditioner Download PDFInfo
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- CN113794299B CN113794299B CN202111074581.XA CN202111074581A CN113794299B CN 113794299 B CN113794299 B CN 113794299B CN 202111074581 A CN202111074581 A CN 202111074581A CN 113794299 B CN113794299 B CN 113794299B
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- magnetic steel
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- rotor assembly
- steel groove
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- 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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a rotor assembly, a motor, a compressor and an air conditioner, wherein the rotor assembly comprises a rotor core, the rotor core is provided with a plurality of magnetic poles, a first magnetic steel groove and a second magnetic steel groove are formed in the rotor core under the same magnetic pole, the first magnetic steel groove and the second magnetic steel groove are symmetrical about a d axis of the magnetic pole and are in a V shape, two V-shaped magnetic steel grooves are formed in a V-shaped opening area, the two V-shaped magnetic steel grooves are respectively arranged corresponding to the first magnetic steel groove and the second magnetic steel groove, the two V-shaped magnetic steel grooves are symmetrical about the d axis, V-shaped openings face the first magnetic steel groove and the second magnetic steel groove which are respectively corresponding, main magnetic steel is arranged in the first magnetic steel groove and the second magnetic steel groove, and auxiliary magnetic steel is arranged in the V-shaped magnetic steel groove. According to the invention, the air gap flux density can be obviously enhanced, the torque pulsation and harmonic content of the motor are greatly reduced, the vibration of the motor is reduced, the noise of the motor is improved, and the waveform of the air gap flux density tends to be more sinusoidal when the motor runs.
Description
Technical Field
The invention belongs to the technical field of motor manufacturing, and particularly relates to a rotor assembly, a motor, a compressor and an air conditioner.
Background
In recent years, permanent magnet motors have been developed at a high speed, and more permanent magnet motors are on the market. In the permanent magnet motor, the purpose of rotor rotation is achieved through interaction of a magnetic field generated by a stator and a magnetic field generated by a rotor, so that the magnetic field generated by the rotor is fully utilized, and the reduction of magnetic leakage is the direction needed to be researched by researchers. Meanwhile, the motor structure of the permanent magnet motor has the inherent problem of cogging torque, so that the pulsation of output torque is overlarge, and the control precision of the motor is influenced. Therefore, how to effectively solve the problem of cogging torque is also a problem which needs to be solved urgently by the people in the field at present. In order to reduce torque pulsation, improve vibration noise and improve motor efficiency, a novel motor rotor structure is provided for the purpose.
Disclosure of Invention
Therefore, the invention provides a rotor assembly, a motor, a compressor and an air conditioner, which can overcome the defects of small air gap magnetic density, large torque pulsation, high harmonic content and the like caused by magnetic leakage between a stator and a rotor in the related technology.
In order to solve the above problems, the present invention provides a rotor assembly including a rotor core having a plurality of magnetic poles thereon, under the same magnetic pole, a first magnetic steel groove and a second magnetic steel groove are constructed on the rotor iron core, the first magnetic steel groove and the second magnetic steel groove are symmetrical about the d axis of the magnetic pole and are V-shaped, the opening of the V-shaped opening faces the outer circumferential side of the rotor core, two V-shaped magnetic steel grooves are constructed on the opening area of the V-shaped opening, the two V-shaped magnetic steel grooves are respectively arranged corresponding to the first magnetic steel groove and the second magnetic steel groove, the two V-shaped magnetic steel grooves are symmetrical about the d axis, and the V-shaped opening faces the first magnetic steel groove and the second magnetic steel groove which are respectively corresponding, the magnetic steel groove is provided with a first magnetic steel groove and a second magnetic steel groove, wherein the first magnetic steel groove and the second magnetic steel groove are both provided with main magnetic steel, the V-shaped magnetic steel groove is internally provided with auxiliary magnetic steel, and the polarities of the opposite sides of the main magnetic steel and the auxiliary magnetic steel are opposite.
In some embodiments, the V-shaped magnetic steel groove includes a first groove section near one side of the d-axis and a second groove section far from one side of the d-axis, and the auxiliary magnetic steel includes a first magnetic steel installed in the first groove section and a second magnetic steel installed in the second groove section, where a radial thickness of the first magnetic steel and/or the second magnetic steel is B, a radial thickness of the main magnetic steel is B, and B/B is greater than or equal to 0.15 and less than or equal to 0.3.
In some embodiments, the second magnetic steel is perpendicular to the d-axis, when the second magnetic steel corresponds to the first magnetic steel slot, a first distance between a midpoint of a circumferential length of the second magnetic steel and the main magnetic steel in the first magnetic steel slot is c, and c/b is greater than or equal to 3 and less than or equal to 5, wherein the first distance is in a direction parallel to the d-axis.
In some embodiments, the first magnetic steel has a circumferential length of l1, and the second magnetic steel has a circumferential length of l2, wherein l1 > l 2.
In some embodiments, 0.75 ≦ l2/l1 ≦ 0.9.
In some embodiments, the main magnetic steel has a circumferential length L, L > L1 > L2.
In some embodiments, the main magnetic steel has a circumferential length L, 0.15 ≦ L1/L ≦ 0.3, and/or 0.15 ≦ L2/L ≦ 0.3.
In some embodiments, the second magnetic steel forms an angle α with the d-axis, where α is 30 ° or less and 45 ° or less.
In some embodiments, the remanence and coercivity of the auxiliary magnetic steel are both higher than those of the main magnetic steel; and/or the auxiliary magnetic steel and the main magnetic steel are permanent magnets.
In some embodiments, two sets of the V-shaped magnetic steel grooves are arranged corresponding to the first magnetic steel groove, and the two sets of the V-shaped magnetic steel grooves are arranged at intervals along the length extension direction of the first magnetic steel groove; and/or, two sets of V-shaped magnetic steel grooves are arranged corresponding to the second magnetic steel grooves and are arranged at intervals along the length extending direction of the second magnetic steel grooves.
The invention also provides a motor comprising the rotor assembly.
The invention also provides a compressor comprising the rotor assembly.
The invention also provides an air conditioner which comprises the motor or the compressor.
According to the rotor assembly, the motor, the compressor and the air conditioner, the two V-shaped magnetic steel grooves which are symmetrical to each other are correspondingly arranged in the V-shaped opening areas formed by the first magnetic steel groove and the second magnetic steel groove respectively, so that the air gap magnetic density can be obviously enhanced, the torque pulsation and harmonic content of the motor are greatly reduced, the motor vibration is reduced, the motor noise is improved, and the waveform of the air gap magnetic density tends to be sinusoidal when the motor runs.
Drawings
FIG. 1 is a schematic structural view (axial view) of a rotor assembly according to an embodiment of the present invention;
FIG. 2 is a partial structural view of a rotor assembly of an embodiment of the present invention under a magnetic pole;
FIG. 3 is another partial structural view of a rotor assembly of the present invention under a magnetic pole;
FIG. 4 is a schematic view of the magnetizing directions of the main magnetic steel and the auxiliary magnetic steel under one magnetic pole of the rotor assembly according to the embodiment of the present invention;
FIG. 5 is a waveform simulation diagram of the magnetic flux density of the air gap of a motor without the V-shaped magnetic steel slot of the present invention in the related art;
FIG. 6 is a waveform simulation diagram of the motor air gap flux density using the V-shaped magnetic steel slot of the invention.
The reference numerals are represented as:
1. a rotor core; 11. a first magnetic steel slot; 12. a second magnetic steel slot; 13. main magnetic steel; 2. a V-shaped magnetic steel groove; 21. a first groove section; 22. a second groove section; 23. a first magnetic steel; 24. and a second magnetic steel.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present invention, a rotor assembly is provided, which includes a rotor core 1, the rotor core 1 has a plurality of magnetic poles, under a same magnetic pole, a first magnetic steel slot 11 and a second magnetic steel slot 12 are configured on the rotor core 1, the first magnetic steel slot 11 and the second magnetic steel slot 12 are symmetric with respect to a d axis of the magnetic pole and are V-shaped, an opening of the V-shape faces an outer circumferential side of the rotor core 1, two V-shaped magnetic steel slots 2 are configured on an opening area of the V-shape, the two V-shaped magnetic steel slots 2 are respectively disposed corresponding to the first magnetic steel slot 11 and the second magnetic steel slot 12, the two V-shaped magnetic steel slots 2 are symmetric with respect to the d axis and have V-shaped openings facing the corresponding first magnetic steel slot 11 and the second magnetic steel slot 12, wherein a main magnetic steel 13 is disposed in the first magnetic steel slot 11 and the second magnetic steel slot 12, an auxiliary magnetic steel is installed in the V-shaped magnetic steel slot 2, the polarity of the opposite side of the main magnetic steel 13 and the auxiliary magnetic steel is opposite, specifically, as shown in fig. 4, the radial outer side of the main magnetic steel 13 is an S pole, and the radial inner side of the auxiliary magnetic steel is an N pole. In the technical scheme, two V-shaped magnetic steel grooves 2 which are symmetrical to each other are correspondingly arranged in V-shaped opening areas formed by the first magnetic steel groove 11 and the second magnetic steel groove 12 respectively, so that the air gap magnetic density can be obviously enhanced, the torque pulsation and harmonic content of the motor are greatly reduced, the vibration of the motor is reduced, the noise of the motor is improved, and the waveform of the air gap magnetic density tends to be more sinusoidal when the motor runs; it should be noted that, in the present invention, the V-shaped magnetic steel grooves 2 are combined with the corresponding auxiliary magnetic steel, so that the direction and angle of the optimized magnetic circuit are more flexible and the effect of optimizing the magnetic flux density waveform is better compared with the one-word-groove combined one-word magnetic steel in the related art.
In some embodiments, the radial thickness of the main magnetic steel 13 is greater than that of the auxiliary magnetic steel, specifically, the V-shaped magnetic steel slot 2 includes a first slot section 21 close to one side of the d-axis and a second slot section 22 far away from one side of the d-axis, the auxiliary magnetic steel includes a first magnetic steel 23 installed in the first slot section 21 and a second magnetic steel 24 installed in the second slot section 22, where the radial thickness of the first magnetic steel 23 and/or the second magnetic steel 24 is B, the radial thickness of the main magnetic steel 13 is B, B/B is greater than or equal to 0.15 and less than or equal to 0.3, and when B/B is less than 0.15, the thickness of the auxiliary magnetic steel is too thin to be processed, the rotor processing process is complex, and is not beneficial to mass production; when the B/B is more than 0.3, the magnetic density of the air gap is not obviously improved, the magnetic steel consumption of the auxiliary magnetic steel is increased, and the manufacturing cost of the motor is improved.
In some embodiments, the second magnetic steel 24 is perpendicular to the d-axis, when the second magnetic steel 24 corresponds to the first magnetic steel slot 11, a first distance between a midpoint of a circumferential length of the second magnetic steel 24 and the main magnetic steel 13 in the first magnetic steel slot 11 is c, and c/b is greater than or equal to 3 and less than or equal to 5, wherein the first distance is in a direction parallel to the d-axis, so that the magnetic path optimization effect of the auxiliary magnetic steel can be fully exerted.
In some embodiments, two sets of the V-shaped magnetic steel grooves 2 are disposed corresponding to the first magnetic steel groove 11, and the two sets of the V-shaped magnetic steel grooves 2 are disposed at intervals along the length extending direction of the first magnetic steel groove 11; and/or, correspond second magnet steel groove 12 is provided with two sets of V-arrangement magnet steel groove 2, two sets of V-arrangement magnet steel groove 2 along the length extending direction interval of second magnet steel groove 12 sets up, also leaves the certain distance between two adjacent supplementary magnet steel, helps main magnet steel 13 to provide the magnetic flux to the air gap, improves the flux linkage of motor, reduces the running current of motor operation, and the scope that makes optimization magnetic circuit simultaneously is bigger. At this moment, it is best, first magnet steel 23's circumference length is l1, second magnet steel 24's circumference length is l2, and l1 > l2, and is specific, and 0.75 is less than or equal to l2/l1 and is less than or equal to 0.9, also, second magnet steel 24's circumference length compares first magnet steel 23's circumference length is expected to be short, because of the auxiliary magnet steel of horizontal placement (also second magnet steel 24) if length is longer partially, then the air gap between two sets of auxiliary magnet steel is less, influences main permanent magnet and provides the magnetic flux to the air gap, and has increased the permanent magnet cost, and 0.75 is less than or equal to l1/l2 and is less than or equal to 0.9 and can effectively reduce the utilization ratio of permanent magnet, reduces motor cost.
In some embodiments, the main magnet 13 has a circumferential length L, L > L1 > L2, and further, the main magnet 13 has a circumferential length L, 0.15 ≦ L1/L ≦ 0.3, and/or 0.15 ≦ L2/L ≦ 0.3. That is, the circumference length of main magnet steel 13 is greater than the circumference length of first magnet steel 23 and/or second magnet steel 24, can be when guaranteeing that magnetic circuit optimization scope is as big as possible, reduce the permanent magnet quantity, increase the air gap between two sets of supplementary magnet steel, main magnet steel 13 also can provide the magnetic flux to the air gap, the angle direction that magnetic force was optimized is abundanter and nimble, if first magnetism, 23 and/or second magnet steel 24's circumference length is too short, then main magnet steel 13 provides most magnetic flux to the air gap, be not in accordance with the original intention of magnetic circuit optimization.
An included angle formed between the second magnetic steel 24 and the d axis is alpha, and alpha is more than or equal to 30 degrees and less than or equal to 45 degrees, so that the torque density of the motor can be improved more favorably in the range.
The auxiliary magnetic steel and the main magnetic steel 13 are both permanent magnets, and in some embodiments, the remanence and the coercive force of the auxiliary magnetic steel are both higher than those of the main magnetic steel 13, so that the harmonic wave of an air-gap magnetic field can be improved, the sine of the air-gap magnetic field is improved, and the problem of poor demagnetization resistance of the motor is solved.
Compared with the air gap flux density waveform of fig. 5 and fig. 6, the ordinary V-shaped magnetic steel generates a distorted air gap magnetic field, the distortion rate is higher, the waveform is far deviated from the expected sinusoidal waveform, and the air gap flux density waveform after optimization (i.e. by adopting the technical scheme of the present invention) has a smaller distortion rate and is closer to the expected sinusoidal curve.
According to an embodiment of the present invention, there is also provided a motor including the rotor assembly described above.
According to an embodiment of the present invention, there is also provided a compressor including the rotor assembly described above.
According to an embodiment of the present invention, there is also provided an air conditioner including the motor or the compressor described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (13)
1. The utility model provides a rotor assembly, includes rotor core (1), a plurality of magnetic poles have on rotor core (1), under same magnetic pole, rotor core (1) is gone up to be constructed first magnetic steel groove (11), second magnetic steel groove (12), first magnetic steel groove (11) with second magnetic steel groove (12) about the d axial symmetry of magnetic pole and be the V type, the mouth of opening of V type orientation the outer circumferencial side of rotor core (1), its characterized in that, it has two V-arrangement magnetic steel grooves (2) to construct on the mouth region of opening of V type, two V-arrangement magnetic steel groove (2) correspond respectively first magnetic steel groove (11), second magnetic steel groove (12) set up, two V-arrangement magnetic steel groove (2) about d axial symmetry and V-arrangement are opened and are all towards first magnetic steel groove (11), second magnetic steel groove (12) that correspond respectively, wherein first magnetic steel groove (11), The main magnetic steel (13) is arranged in each second magnetic steel groove (12), the auxiliary magnetic steel is arranged in each V-shaped magnetic steel groove (2), and the polarities of the opposite sides of the main magnetic steel (13) and the auxiliary magnetic steel are opposite.
2. The rotor assembly according to claim 1, wherein the V-shaped magnetic steel slot (2) comprises a first slot segment (21) close to one side of the d-axis and a second slot segment (22) far from one side of the d-axis, the auxiliary magnetic steel comprises a first magnetic steel (23) installed in the first slot segment (21) and a second magnetic steel (24) installed in the second slot segment (22), wherein the radial thickness of the first magnetic steel (23) and/or the second magnetic steel (24) is B, the radial thickness of the main magnetic steel (13) is B, and B/B is greater than or equal to 0.15 and less than or equal to 0.3.
3. The rotor assembly according to claim 2, wherein the second magnetic steel (24) is perpendicular to the d-axis, and when the second magnetic steel (24) corresponds to the first magnetic steel slot (11), a first distance between a midpoint of a circumferential length of the second magnetic steel (24) and the main magnetic steel (13) in the first magnetic steel slot (11) is c, 3 ≦ c/b ≦ 5, wherein the first distance is in a direction parallel to the d-axis.
4. A rotor assembly as claimed in claim 2 or 3, wherein the first magnetic steel (23) has a circumferential length l1, and the second magnetic steel (24) has a circumferential length l2, l1 > l 2.
5. The rotor assembly of claim 4 wherein 0.75 ≦ l2/l1 ≦ 0.9.
6. The rotor assembly according to claim 4, wherein the main magnet (13) has a circumferential length L, L > L1 > L2.
7. The rotor assembly according to claim 6, wherein the main magnet (13) has a circumferential length L, 0.15 ≦ L1/L ≦ 0.3, and/or 0.15 ≦ L2/L ≦ 0.3.
8. The rotor assembly according to claim 2 or 3, wherein an angle α, 30 ° ≦ α ≦ 45 ° is formed between the second magnetic steel (24) and the d-axis.
9. The rotor assembly according to claim 1, wherein the remanence and the coercivity of the auxiliary magnetic steel are both higher than those of the main magnetic steel (13); and/or the auxiliary magnetic steel and the main magnetic steel (13) are both permanent magnets.
10. The rotor assembly according to claim 1, wherein two sets of the V-shaped magnetic steel grooves (2) are arranged corresponding to the first magnetic steel groove (11), and the two sets of the V-shaped magnetic steel grooves (2) are arranged at intervals along the length extension direction of the first magnetic steel groove (11); and/or two groups of V-shaped magnetic steel grooves (2) are arranged corresponding to the second magnetic steel grooves (12), and the two groups of V-shaped magnetic steel grooves (2) are arranged at intervals along the length extending direction of the second magnetic steel grooves (12).
11. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 10.
12. A compressor comprising a rotor assembly as claimed in any one of claims 1 to 10.
13. An air conditioner characterized by comprising the motor of claim 11 or the compressor of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111074581.XA CN113794299B (en) | 2021-09-14 | 2021-09-14 | Rotor subassembly, motor, compressor, air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111074581.XA CN113794299B (en) | 2021-09-14 | 2021-09-14 | Rotor subassembly, motor, compressor, air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113794299A CN113794299A (en) | 2021-12-14 |
| CN113794299B true CN113794299B (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111074581.XA Active CN113794299B (en) | 2021-09-14 | 2021-09-14 | Rotor subassembly, motor, compressor, air conditioner |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5082825B2 (en) * | 2007-12-21 | 2012-11-28 | 株式会社安川電機 | Rotor for embedded magnet type rotating electrical machine, embedded magnet type rotating electrical machine, vehicle, elevator, fluid machine, processing machine using the rotating electrical machine |
| KR101321279B1 (en) * | 2012-04-19 | 2013-10-28 | 삼성전기주식회사 | Rotor assembly |
| JP6508168B2 (en) * | 2016-11-15 | 2019-05-08 | トヨタ自動車株式会社 | Electric rotating machine |
| CN109194078B (en) * | 2018-09-21 | 2020-04-24 | 东南大学 | Double-layer permanent magnet composite magnetic circuit memory motor |
| CN208939695U (en) * | 2018-11-01 | 2019-06-04 | 哈尔滨理工大学 | A kind of rotor structure improving magneto weak magnetism speed expansion performance |
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