CN112421822B - Rotor core, rotor structure, motor, compressor and have its electrical apparatus - Google Patents
Rotor core, rotor structure, motor, compressor and have its electrical apparatus Download PDFInfo
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- CN112421822B CN112421822B CN202011195964.8A CN202011195964A CN112421822B CN 112421822 B CN112421822 B CN 112421822B CN 202011195964 A CN202011195964 A CN 202011195964A CN 112421822 B CN112421822 B CN 112421822B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The application provides a rotor core, rotor structure, motor and compressor and have its electrical apparatus, include: an iron core body; the peripheral wall of the iron core body is provided with a groove group; the groove group comprises n grooves; in the groove group, each groove has a different size from any of the other grooves; the n grooves are all positioned in the q-axis direction; wherein n ≧ 2. According to the rotor core, the rotor structure, the motor, the compressor and the electric appliance with the compressor, the problem of noise and vibration of the permanent magnet synchronous motor can be solved.
Description
Technical Field
The application belongs to the technical field of air conditioners, and particularly relates to a rotor core, a rotor structure, a motor, a compressor and an electric appliance with the same.
Background
At present, the permanent magnet synchronous motor is widely used in the industry because of the advantages of small volume, simple structure and the like.
However, the existing permanent magnet synchronous electrode is the same as the traditional motor and has the problem of noise vibration, particularly, the motor in the field of compressors is usually connected with a crankshaft structure, the crankshaft is eccentric, and the eccentricity exists, so that the motor forms non-sinusoidal air gap magnetic density, and the motor generates larger electromagnetic vibration and electromagnetic noise, thereby not only influencing the service life of the motor, but also bringing great trouble to the noise requirement in the field with strict noise requirements in some special working environments.
Therefore, how to provide a rotor core, a rotor structure, a motor and a compressor capable of improving the noise and vibration problem of a permanent magnet synchronous motor, and an electric appliance with the same become problems to be solved urgently by those skilled in the art.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a rotor core, a rotor structure, a motor, a compressor and an electric appliance with the same, which can improve the noise and vibration problem of a permanent magnet synchronous motor.
In order to solve the above problem, the present application provides a rotor core including: an iron core body; the peripheral wall of the iron core body is provided with a groove group; the groove group comprises n grooves; in the groove group, each groove has a different size from any of the other grooves; the n grooves are all positioned in the q-axis direction; wherein n ≧ 2.
Preferably, in the groove group, n grooves are arranged in order in the first direction; in the first direction, the widths of the n grooves are sequentially increased; wherein, the width of recess is the distance that the recess extends in the circumference of iron core body.
Preferably, the first direction is a central axis direction of the core body; and/or the first direction is the circumferential direction of the iron core body.
Preferably, in the first direction, the grooves are a first groove, a second groove … nth groove in sequence; the width ratio of the n grooves is a first groove: second groove …: the nth groove is 1:2 …: n.
Preferably, the core body is made of punched sheets; the punching sheet group comprises n punching sheets; the peripheral wall of each punching sheet is provided with a groove; in the central axis direction of the iron core body, the positions of the grooves on the n punching sheets correspond to each other to form a groove group;
and/or the number of punching sheet groups is at least one; when the number of the punching sheet groups is more than two groups, the punching sheet groups more than two groups are sequentially laminated in the direction of the central axis of the iron core body.
Preferably, the number of groove groups is set to m groups; when the number of the groove groups is more than two groups, the groove groups are sequentially arranged in the first direction; wherein m ≧ 1.
According to still another aspect of the present application, there is provided a rotor structure including a rotor core, the rotor core being the above-mentioned rotor core.
Preferably, the rotor structure further comprises S permanent magnets; when the first direction is the circumferential direction of the iron core body, the number of the groove groups is set to be m groups; in the groove group, when n grooves are arranged in order in the first direction, S ═ mn.
According to yet another aspect of the present application, there is provided an electric machine comprising a rotor structure as described above.
Preferably, the groove depth of each groove is equal; the distance between the groove bottom of the groove and the central axis of the iron core body is D2; the included angle between the q axis and the D axis is theta, the width of the stator and rotor air gap is delta, the distance between the permanent magnet and the central axis of the iron core body is H, the number of pole pairs of the motor is 2P, and the outer diameter of the iron core body is D1; wherein:
according to still another aspect of the present application, there is provided a compressor including a motor, the motor being the above-mentioned motor.
According to still another aspect of the present application, there is provided an electric appliance including a compressor, the compressor being the above-mentioned compressor.
The rotor core, the rotor structure, the motor, the compressor and the electric appliance with the motor are characterized in that at least two grooves are additionally arranged on the outer peripheral wall of the core body in the q-axis direction, the sizes of all the grooves are different, the length of a q-axis air gap is unevenly distributed due to uneven distribution, an uneven air gap structure is formed between a stator and a rotor, the air gap magnetic field waveform of the motor is improved, uneven air gaps caused by the eccentric distance of a crankshaft are weakened, the torque pulsation of the motor is greatly reduced, the electromagnetic vibration and the electromagnetic noise of the motor are reduced, the performance of the motor is improved, and the service life of the motor is prolonged; the problem of noise vibration of the permanent magnet synchronous motor can be solved; the electromagnetic noise of the motor in the operation process is mainly solved.
Drawings
Fig. 1 is a schematic structural view of a rotor core according to an embodiment of the present application;
FIG. 2 is an enlarged view taken at A in FIG. 1;
fig. 3 is a schematic structural diagram of a first stamped sheet according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second stamped sheet according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a third punching sheet according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a punching sheet according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a punching sheet according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a punch sheet according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a rotor structure according to an embodiment of the present application.
The reference numerals are represented as:
1. an iron core body; 11. punching; 111. a first punching sheet; 112. a second punching sheet; 113. a third punching sheet; 2. a groove; 21. a first groove; 22. a second groove; 23. a third groove; 24. and a fourth groove.
Detailed Description
Referring collectively to fig. 1, according to an embodiment of the present application, a rotor core includes: an iron core body 1; the peripheral wall of the iron core body 1 is provided with a groove group; the groove group comprises n grooves 2; in the groove group, each groove 2 is different from any one of the other grooves 2 in size; the n grooves 2 are all positioned in the q-axis direction; wherein n is ≧ 2; in the q-axis direction, at least two grooves 2 are additionally arranged on the outer peripheral wall of the iron core body 1, the sizes of the grooves 2 are different, the length of a q-axis air gap is unevenly distributed due to uneven distribution, an uneven air gap structure is formed between a stator and a rotor, the air gap magnetic field waveform of the motor is improved, the uneven air gap caused by the eccentric distance of a crankshaft is weakened, and the torque pulsation of the motor is greatly reduced, so that the electromagnetic vibration and the electromagnetic noise of the motor are reduced, the performance of the motor is improved, and the service life of the motor is prolonged; the problem of noise vibration of the permanent magnet synchronous motor can be solved; mainly solves the electromagnetic noise of the motor in the operation process. The groove 2 is a through groove opened at two end faces of the iron core body 1, that is, it has a notch at the outer edge of the iron core body 1.
The application also discloses embodiments in which n grooves 2 are arranged in series in a first direction in a groove group; in the first direction, the widths of the n grooves 2 are sequentially increased; wherein the width of the groove 2 is the distance that the groove 2 extends in the circumferential direction of the core body 1. The width of the first groove 21 is d1, the width of the second groove 22 is d2, the width of the third groove 23 is d3, and the width of the fourth groove 24 is d4 …; then d1< d2< d3< d4< …. In the first direction, the widths of the n grooves 2 sequentially increase or decrease.
The application also discloses some embodiments, the first direction is the central axis direction of the iron core body 1; and/or the first direction is the circumferential direction of the core body 1. The first direction is the central axis direction of the iron core body 1, namely along the axial direction of the rotor, the grooves 2 on the outer edge are gradually increased or decreased in distribution, the uneven distribution enables the length of a q-axis air gap to be unevenly distributed, an uneven air gap structure is formed between the stator and the rotor, the air gap magnetic field waveform of the motor is improved, the uneven air gap caused by the eccentricity of a crankshaft is weakened, the sine distribution of the reluctance of the motor rotor can be formed, and the sine degree of the reluctance of the air gap is controlled through changing the outer circle structure of the rotor, so that the air gap magnetic density which is required to be corrected by people is obtained. When the first direction is the central axis direction of the iron core body 1, the grooves 2 are sequentially reduced or increased from top to bottom in the central axis direction of the iron core body 1; when the first direction is the circumference of the iron core body 1, the plurality of grooves 2 are arranged in the circumference of the iron core body 1, and the grooves 2 are sequentially reduced or increased in the clockwise or counterclockwise direction.
The application also discloses some embodiments, in the first direction, the grooves 2 are a first groove 21, a second groove 22 … and an nth groove 2 in sequence; the width ratio of the n grooves 2 is first groove 21: second groove 22 …: the nth groove 2 is 1:2 …: n; each rotor punching sheet 11 is arranged in the direction of a rotor q axis, a plurality of grooves 2 are formed in the outer circumference of the rotor, the width of each groove 2 is different and is designed according to a certain proportion, and the width of each groove 2 is set according to a certain proportion.
Referring to fig. 2 in combination, the present application also discloses some embodiments, the iron core body 1 is made of punching sheets; the punching sheet group comprises n punching sheets 11; the peripheral wall of each punching sheet 11 is provided with a groove 2; in the central axis direction of the iron core body 1, the positions of the grooves 2 on the n punching sheets 11 correspond to each other to form a groove group; the rotor core is formed by laminating a plurality of punching sheet sets according to the required height by a rotor punching sheet 11 which is formed by high punching of silicon steel sheets. In each group of the punching sheets 11, the number of the punching sheets 11 is equal to the number of the grooves 2 arranged on each punching sheet 11; the number of each group of grooves 2 in the axial direction of the rotor is equal to that of the punching sheets 11; namely, each group is provided with n punching sheets 11, and each punching sheet 11 is provided with n grooves 2; in the axial direction of the rotor, each group of grooves 2 comprises n grooves 2; for example, when n is 3, the punching sheet includes a first punching sheet 111, a second punching sheet 112 and a third punching sheet 113, each punching sheet 11 includes a first groove 21, a second groove 22 and a third groove 23, and three grooves 2 on each punching sheet 11 form a groove group arranged in the circumferential direction; namely, the three punching sheets 11 have the same structure;
when the iron core body 1 is laminated:
the third groove 23 of the first stamped sheet 111, the second groove 22 of the second stamped sheet 112 and the first groove 21 of the third stamped sheet 113 correspond to form a first groove group in the axial direction of the rotor in the axial direction of the iron core body 1;
the second groove 22 of the first stamped sheet 111, the first groove 21 of the second stamped sheet 112 and the third groove 23 of the third stamped sheet 113 correspond to form a second groove group in the axial direction of the rotor in the axial direction of the iron core body 1;
the first groove 21 of the first stamped sheet 111, the third groove 23 of the second stamped sheet 112, and the second groove 22 of the third stamped sheet 113 correspond to form a third groove group in the axial direction of the rotor in the axial direction of the iron core body 1.
The number of punching sheet groups is at least one; when the number of the punching sheet groups is more than two, the punching sheet groups are sequentially laminated in the central axis direction of the iron core body 1; thus, each punching sheet group comprises 3 punching sheets 11; the punching sheet comprises a first punching sheet 111, a second punching sheet 112 and a third punching sheet 113 from top to bottom, wherein a first groove 21 is formed in the first punching sheet 111; the second punching sheet 112 is provided with a second groove 22; a third groove 23 is formed in the third punching sheet 113; the three grooves 2 correspondingly form a groove group at the position of the central axis direction of the iron core body 1; i.e. each set of groove types comprises three grooves 2: a first groove 21, a second groove 22, and a third groove 23; when the first direction is the central axis direction of the core body 1, n grooves 2 are sequentially arranged in the central axis direction of the core body 1 in the groove group. When the number of the punching sheet groups is more than two, the punching sheet groups are sequentially laminated in the direction of the central axis of the iron core body 1; as shown in fig. 2: the formed iron core body 1 comprises the following punching sheets 11 from top to bottom: the first punching sheet 111, the second punching sheet 112, the third punching sheet 113, the first punching sheet 111, the second punching sheet 112 and the third punching sheet 113 … are stacked in sequence and are formed by circularly and repeatedly stacking, and the height of the stacked rotor is designed according to requirements.
Referring to fig. 3 to 5 in combination, when the first direction is the circumferential direction of the core body 1, in the groove group, n grooves 2 are sequentially arranged in the circumferential direction of the core body 1; when n is 3, the three grooves 2 are sequentially arranged in the central axis direction of the iron core body 1; all be provided with three recess 2 on first punching sheet 111, second punching sheet 112 and the third punching sheet 113: the first groove 21, the second groove 22 and the third groove 23 are the same in structure, namely, the three punching sheets 11 are the same in structure.
The application also discloses some embodiments, the number of groove groups is set as m groups; when the number of the groove groups is more than two groups, the groove groups are sequentially arranged in the first direction; wherein m ≧ 1. As shown in fig. 6 to 7, each punching sheet 11 may include a plurality of groups of grooves 2, and each groove group includes two grooves 2; with reference to fig. 6, the punching sheet comprises three groove groups, and the three groove groups are sequentially arranged in the circumferential direction of the punching sheet 11; each groove group includes a first groove 21 and a second groove 22, and the first groove 21 and the second groove 22 increase in the clockwise direction.
As shown in fig. 7, the punching sheet comprises two groove groups, and the two groove groups are sequentially arranged in the circumferential direction of the punching sheet 11; each groove group includes first, second, and third grooves 21, 22, 23, and fourth grooves 24, and the first, second, and third grooves 21, 22, 23, and fourth grooves 24 sequentially increase in a clockwise direction.
According to the embodiment of the application, the rotor structure comprises the rotor core, and the rotor core is the rotor core.
The application also discloses some embodiments, the rotor structure further comprises S permanent magnets; when the first direction is the circumferential direction of the iron core body 1, the number of the groove groups is set to be m groups; when n grooves 2 are arranged in this order in the first direction in the groove group, S ═ mn; s ≧ 3. The rotor core is provided with a plurality of permanent magnets, namely a groove 2 is arranged between two adjacent permanent magnets in the circumferential direction; the number of the permanent magnets is the same as the total number of the grooves 2 in the circumferential direction, each rotor is provided with a plurality of groups of grooves, one rotor permanent magnet is at least 4, and the number of the permanent magnets can be more than one, and each group of grooves comprises at least two grooves 2; i.e. when there are four permanent magnets, there may be two sets of grooves 2, two grooves 2 in each set, a first groove 21 and a second groove 22; it is also possible to have a set of grooves 2, each set having four grooves 2, a first groove 21, a second groove 22, a third groove 23 and a fourth groove 24.
According to an embodiment of the present application, there is provided a motor including a rotor structure, where the rotor structure is the above-mentioned rotor structure.
Referring to fig. 8-9 in combination, the present application also discloses embodiments wherein the grooves 2 are each of equal depth; the distance between the bottom of the groove 2 and the central axis of the iron core body 1 is D2; an included angle between the q axis and the D axis is theta, the width of a stator and rotor air gap is delta, the distance between the permanent magnet and the central axis of the iron core body 1 is H, the number of pole pairs of the motor is 2P, and the outer diameter of the iron core body 1 is D1; wherein:
the motor is a permanent magnet motor, and the permanent magnet motor is a synchronous permanent magnet motor.
According to an embodiment of the application, a compressor is provided, which comprises a motor, wherein the motor is the motor.
According to an embodiment of the application, an electric appliance is provided, and the electric appliance comprises a compressor.
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 intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing are only preferred embodiments of the present application, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (12)
1. A rotor core, comprising: an iron core body (1); the peripheral wall of the iron core body (1) is provided with a groove group; the groove group comprises n grooves (2); the n grooves (2) are sequentially arranged in the direction of the central axis of the iron core body (1); in the groove group, each groove (2) has a circumferential dimension different from the remaining axially adjacent grooves (2); the n grooves (2) are all in the q-axis direction; wherein n is more than or equal to 2; the iron core body (1) is made of punching sheet groups, and a q axis of each punching sheet group is axially aligned; the punching sheet group comprises n punching sheets, and a plurality of grooves (2) are formed in the peripheral wall of each punching sheet (11) along the circumferential direction; and the circumferential sizes of the circumferentially adjacent grooves (2) of each stamped steel (11) are different, and the q axis refers to the symmetric center line of the adjacent magnetic poles.
2. A rotor core according to claim 1, characterized in that in the groove group n of the grooves (2) are arranged one after the other in a first direction; in the first direction, the widths of the n grooves (2) are sequentially increased; wherein the width of the groove (2) is the distance that the groove (2) extends in the circumferential direction of the core body (1).
3. The rotor core according to claim 2, wherein the first direction is a central axis direction of the core body (1); and/or the first direction is the circumferential direction of the iron core body (1).
4. A rotor core according to claim 2, characterised in that in the first direction the recesses (2) are in the order a first recess (21), a second recess (22) … nth recess; the width ratio of the n grooves (2) is a first groove (21): second groove (22) …: the nth groove is 1:2 …: n is used as the index.
5. The rotor core according to claim 1, wherein the group of laminations comprises n laminations (11); the outer peripheral wall of each punching sheet (11) is provided with the groove (2); in the central axis direction of the iron core body (1), the positions of the grooves (2) on the n punching sheets (11) correspond to each other to form the groove group;
and/or the number of the punching sheet groups is at least one; when the number of the punching sheet groups is more than two, the punching sheet groups are sequentially laminated in the direction of the central axis of the iron core body (1).
6. The rotor core according to claim 2, wherein the number of the groove groups is set to m groups; when the number of the groove groups is set to two or more groups, the groove groups are arranged in order in the first direction; wherein m is more than or equal to 1.
7. A rotor structure comprising a rotor core, characterized in that the rotor core is a rotor core according to any one of claims 1-6.
8. The rotor structure of claim 7, further comprising S permanent magnets; when the first direction is the circumferential direction of the iron core body (1), the number of the groove groups is set to be m groups; in the groove group, when n grooves (2) are arranged in sequence in a first direction, S is mn; wherein S is more than or equal to 3.
9. An electrical machine comprising a rotor structure, characterized in that the rotor structure is a rotor structure according to any one of claims 7-8.
10. A machine as claimed in claim 9, characterized in that the groove depth of each groove (2) is equal; the distance between the groove bottom of the groove (2) and the central axis of the iron core body (1) is D2; an included angle between the q axis and the D axis is theta, the width of a stator air gap and a rotor air gap is delta, the distance between the permanent magnet and the central axis of the iron core body (1) is H, the number of pole pairs of the motor is 2P, and the outer diameter of the iron core body (1) is D1; wherein:
11. a compressor comprising an electric motor, characterized in that the electric motor is an electric motor according to any one of claims 9-10.
12. An electrical appliance comprising a compressor, wherein the compressor is the compressor of claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011195964.8A CN112421822B (en) | 2020-10-30 | 2020-10-30 | Rotor core, rotor structure, motor, compressor and have its electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011195964.8A CN112421822B (en) | 2020-10-30 | 2020-10-30 | Rotor core, rotor structure, motor, compressor and have its electrical apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112421822A CN112421822A (en) | 2021-02-26 |
| CN112421822B true CN112421822B (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011195964.8A Active CN112421822B (en) | 2020-10-30 | 2020-10-30 | Rotor core, rotor structure, motor, compressor and have its electrical apparatus |
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| Country | Link |
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| CN (1) | CN112421822B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095010B (en) * | 2011-10-28 | 2017-03-01 | 阿斯莫有限公司 | rotor and motor |
| JP5868513B2 (en) * | 2012-09-07 | 2016-02-24 | 三菱電機株式会社 | Permanent magnet embedded motor |
| JP2014239633A (en) * | 2013-06-10 | 2014-12-18 | 株式会社ミツバ | Rotor core for motor and brushless motor |
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2020
- 2020-10-30 CN CN202011195964.8A patent/CN112421822B/en active Active
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| CN112421822A (en) | 2021-02-26 |
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