CN108616177B - Rotary compressor and refrigeration system - Google Patents
Rotary compressor and refrigeration system Download PDFInfo
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- CN108616177B CN108616177B CN201810631653.8A CN201810631653A CN108616177B CN 108616177 B CN108616177 B CN 108616177B CN 201810631653 A CN201810631653 A CN 201810631653A CN 108616177 B CN108616177 B CN 108616177B
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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
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- 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)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Compressor (AREA)
Abstract
本发明涉及压缩机技术领域，公开了一种旋转式压缩机及制冷系统，该旋转式压缩机包括壳体和设置于该壳体内的永磁同步电机，永磁同步电机包括定子和安装于定子内侧的转子，该转子包括转子铁芯及其上的多个磁极结构，每个磁极结构包括至少一块磁铁并形成一个磁极，该磁铁在转子铁芯的径向截面上的延伸方向与转子铁芯的径向方向以及切向方向之间分别具有夹角；设定转子外径为D2，转子的轴向高度为L，旋转式压缩机的排量为P，旋转式压缩机的排量P与永磁同步电机的尺寸满足关系式：0.085≤P/(D2 2*L)≤0.11。本发明的永磁同步电机在保证电机效率提高的同时，改善了转子的转动惯量，进而提高了旋转式压缩机的能效并有效避免了旋转式压缩机的噪音振动恶化。
The present invention relates to the technical field of compressors, and discloses a rotary compressor and a refrigeration system, wherein the rotary compressor comprises a housing and a permanent magnet synchronous motor arranged in the housing, the permanent magnet synchronous motor comprises a stator and a rotor installed inside the stator, the rotor comprises a rotor core and a plurality of magnetic pole structures thereon, each magnetic pole structure comprises at least one magnet and forms a magnetic pole, and the extension direction of the magnet on the radial cross section of the rotor core has an angle with the radial direction and the tangential direction of the rotor core respectively; the outer diameter of the rotor is set to D 2 , the axial height of the rotor is set to L, the displacement of the rotary compressor is set to P, and the displacement P of the rotary compressor and the size of the permanent magnet synchronous motor satisfy the relationship: 0.085≤P/(D 2 2 *L)≤0.11. The permanent magnet synchronous motor of the present invention improves the rotational inertia of the rotor while ensuring the improvement of the motor efficiency, thereby improving the energy efficiency of the rotary compressor and effectively avoiding the deterioration of the noise and vibration of the rotary compressor.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a rotary compressor and a refrigerating system with the same.
Background
As is well known, rare earth permanent magnet synchronous motors are widely used in home appliances such as air conditioning compressors due to their high efficiency. However, in the existing structure, in order to improve the efficiency of the motor, the area of the stator slot of the stator is generally set larger, which results in smaller inner diameter of the stator and limits the outer diameter of the rotor, so in this structure, a hybrid rotor magnetic circuit structure such as a "V" shape or a "W" shape is generally applied to place the magnet to the maximum extent, thereby finally achieving the purpose of improving the efficiency of the motor. The motor having the above-described structure tends to have a small moment of inertia of the rotor thereof, although it is efficient. Because the single-cylinder rotary compressor is loaded as a pulsation load, the fluctuation of the rotating speed is larger in the low-frequency operation process of the compressor, so that the fluctuation of the compressor is caused, the energy of the compressor is influenced, and the noise vibration of the compressor is deteriorated.
Disclosure of Invention
The invention aims to solve the problems that the efficiency of a compressor with a high-efficiency permanent magnet synchronous motor is affected and the noise vibration of the compressor is deteriorated due to small rotation inertia of a rotor in the prior art.
In order to achieve the above object, an aspect of the present invention provides a rotary compressor including a housing and a permanent magnet synchronous motor disposed in the housing, the permanent magnet synchronous motor including:
a stator including a stator core having a plurality of internal teeth, between which stator slots are defined, and windings disposed in the stator slots and wound around the internal teeth;
A rotor rotatably mounted on an inner side of the stator with an outer circumferential surface thereof being spaced apart from an inner end surface of the inner teeth, the rotor including a rotor core and a plurality of magnetic pole structures circumferentially provided on the rotor core, each of the magnetic pole structures forming a magnetic pole, each of the magnetic pole structures including at least one magnet having an angle between an extending direction of the magnet in a radial section of the rotor core and radial and tangential directions of the rotor core, respectively;
the outer diameter of the rotor is D 2, the axial height of the rotor is L, the displacement of the compressor is P, and the displacement of the rotary compressor and the size of the permanent magnet synchronous motor satisfy the relation: P/(D 2 2. Times.L) is less than or equal to 0.085 and less than or equal to 0.11.
Preferably, a relation is satisfied between a rotor outer diameter D 2 of the rotor and an axial height L of the rotor: L/D 2 is less than or equal to 0.9
Preferably, the stator has a stator outer diameter D 1, a stator inner diameter D 12, and both satisfy the relationship: d 12/D1 is more than or equal to 0.57.
Preferably, all of the magnets in each of the magnetic pole structures form a V-shape or a W-shape with an opening facing outward in a radial cross section of the rotor core.
Preferably, the magnetic pole structure further comprises a magnetic pole groove axially arranged on the rotor core, the magnetic pole groove is V-shaped or W-shaped with an opening outwards on a radial section of the rotor core, and the magnet is arranged in the magnetic pole groove.
Preferably, the number of phases of the permanent magnet synchronous motor is m, the number of stator slots is Q, the number of magnetic poles is a, and Q/(2 mA) =0.5.
Preferably, the magnet is made of rare earth materials, and the residual magnetic field density Br of the magnet is more than or equal to 1.2T.
Preferably, the stator groove has a tapered portion on a radially inner side.
Preferably, the stator core is formed by laminating a plurality of silicon steel sheets, the rotor core is formed by connecting a plurality of core sheets, mounting holes are uniformly arranged on each core sheet along the circumferential direction, and the plurality of core sheets are connected with each other through rivets and the mounting holes.
Another aspect of the invention provides a refrigeration system comprising a rotary compressor as described above.
Through the technical scheme, the invention limits the relation between the size of the permanent magnet synchronous motor with high efficiency and the displacement of the rotary compressor with the permanent magnet synchronous motor, thereby limiting the rotational inertia of the rotor of the permanent magnet synchronous motor within a reasonable range. The permanent magnet synchronous motor improves the rotational inertia of the rotor while ensuring the improvement of the motor efficiency, thereby improving the energy efficiency of the rotary compressor and effectively avoiding the noise vibration deterioration of the rotary compressor.
Drawings
Fig. 1 is a schematic structural view of a stator core of the present invention;
Fig. 2 is a schematic structural view of a rotor core and a magnetic pole structure of the present invention;
Fig. 3 is an axial sectional view of the rotor core of the present invention;
FIG. 4 is a graph of compressor noise as a function of L/D;
fig. 5 is a graph of compressor performance as a function of P/(D 2 2 L).
Description of the reference numerals
1. Internal teeth of stator core 11
12. Stator slot 2 rotor core
21. Mounting hole 3 magnetic pole structure
31. Magnetic pole groove 32 magnet
D1 Stator outer diameter D12 stator inner diameter
D2 Rotor outer diameter Laxial height of rotor
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the present invention, unless otherwise specified, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generically to refer to the upper, lower, left, and right illustrated in the drawings; "inner and outer" means inner and outer relative to the contour of the respective parts themselves.
Referring to fig. 1 to 5, the present invention provides a rotary compressor including a housing and a permanent magnet synchronous motor disposed in the housing, the permanent magnet synchronous motor including a stator and a rotor. The stator of the permanent magnet synchronous motor comprises a stator core 1 and windings, wherein the stator core 1 is provided with a plurality of internal teeth 11, stator slots 12 are defined between adjacent internal teeth 11, and the windings are arranged in the stator slots 12 and wound on the internal teeth 11; the rotor of the permanent magnet synchronous motor is rotatably mounted on the inner side of the stator, and the outer peripheral surface of the rotor is opposite to the inner end surface of the inner teeth 11 of the stator at intervals, the rotor comprises a rotor core 2 and a plurality of magnetic pole structures 3 circumferentially arranged on the rotor core 2, each magnetic pole structure 3 comprises at least one magnet 32 and forms one magnetic pole, and the extending direction of the magnet 32 on the radial section of the rotor core 2 forms an included angle with the radial direction and the tangential direction of the rotor core 2 respectively.
It can be appreciated that the present invention makes the extending direction of the magnet 32 on the radial section of the rotor core 2 and the radial direction and tangential direction of the rotor core 2 have included angles, that is, makes the magnetic circuit structure of the rotor be a hybrid magnetic circuit structure of tangential and radial, which makes the rotor core 2 able to place the magnet 32 to the maximum extent to increase the power density of the motor, thereby finally making the motor have high efficiency. Specifically, in the conventional structure, in order to further reduce copper loss, the stator slot 12 area of the stator is generally set to be large, which results in a smaller stator inner diameter and limits the rotor outer diameter, so in this structure, the rotor needs to use the above-mentioned tangential and radial hybrid magnetic circuit structure to cooperatively improve the motor efficiency.
According to the above, the rotor outer diameter of the rotor is further set as D 2, the axial height of the rotor is set as L, the displacement of the compressor is set as P, and the displacement of the rotary compressor and the size of the permanent magnet synchronous motor satisfy the relation: P/(D 2 2. Times.L) is less than or equal to 0.085 and less than or equal to 0.11. Specifically, the present invention has studied the permanent magnet synchronous motor and the rotary compressor having the same, and has obtained a COP (performance of compressor) variation curve of the compressor as shown in fig. 4 with P/(D22×l). From this curve, the compressor performance is highest and tends to be smooth when 0.085.ltoreq.P/(D 2 2. Times.L). Ltoreq.0.11; when P/(D 2 2 is larger than 0.11), the rotor moment of inertia of the motor is smaller, so that the stress of the compressor is unstable, the energy of the motor is exerted poorly and the energy efficiency of the compressor is reduced; when P/(D 2 2 ×l) < 0.085, the moment of inertia of the motor rotor is excessive, resulting in a large motor loss and thus a decrease in compressor energy. The invention ensures that the P/(D 2 2 L) is less than or equal to 0.085 and less than or equal to 0.11, and the performance of the rotary compressor can reach the standard in the range, namely, the rotor inertia of the permanent magnet synchronous motor has proper value.
Through the technical scheme, the rotor inertia of the permanent magnet synchronous motor is limited within a reasonable range by limiting the relation between the size of the permanent magnet synchronous motor with high efficiency and the displacement P of the rotary compressor. The permanent magnet synchronous motor improves the rotational inertia of the rotor while ensuring the improvement of the motor efficiency, thereby improving the energy efficiency of the rotary compressor and effectively avoiding the noise vibration deterioration of the rotary compressor.
As a preferable structure of the present invention, a relation between the rotor outer diameter D 2 of the rotor and the axial height L of the rotor may be satisfied: L/D 2 is less than or equal to 0.9. According to the invention, by researching the rotary compressor and the permanent magnet synchronous motor, a variation curve of the noise value (dB) of the compressor along with the L/D 2 shown in fig. 5 is obtained, according to the curve, tangential vibration caused by a rotor of the compressor is smaller when the L/D 2 is less than or equal to 0.9, the caused noise is smaller, and the noise of the compressor is rapidly deteriorated when the L/D 2 is more than 0.9. The invention ensures that the L/D 2 is less than or equal to 0.9, and the permanent magnet synchronous motor has smaller L/D 2, so that the rotor shape is approximately in a 'short and fat' shape, and the tangential vibration of the rotary compressor can be effectively reduced, thereby reducing the noise of the rotary compressor, and further improving the overall performance of the rotary compressor.
The outer diameter of the stator is set as D 1, the inner diameter of the stator is set as D 12, and the two further satisfy the relation: d 12/D1 is more than or equal to 0.57. It will be appreciated that when the ratio of the stator inner diameter D12 to the stator outer diameter D1 is less than 0.57, the stator inner diameter D12 is relatively too small, which greatly limits the rotor outer diameter D2, thereby making the moment of inertia of the rotor small. When the ratio of the stator inner diameter D12 to the stator outer diameter D1 is greater than 0.57, the stator inner diameter D12 is relatively large, so that the rotor outer diameter D2 can be made larger. Because the outer diameter D2 of the rotor of the permanent magnet synchronous motor is relatively large, the rotational inertia can be larger, so that the rotor has strong anti-interference capability, and the problem of unstable stress of the low-frequency compressor can be effectively solved for the nonlinear load of the single-cylinder rotary compressor, and the noise of the compressor can be improved.
All the magnets 32 in each of the pole structures 3 are preferably V-shaped or W-shaped forming an opening outward in a radial cross section of the rotor core 2. Specifically, the magnetic pole structure 3 has two magnets 32, the two magnets 32 being formed in a V shape with an opening facing outward in a radial cross section of the rotor core 2; the magnetic pole structure 3 has four magnets 32 formed in a W shape with the opening facing outward in the radial cross section of the rotor core 2, but of course, all the magnets 32 in each magnetic pole structure 3 may also be formed in a U shape or the like with the opening facing outward in the radial cross section of the rotor core 2. The hybrid magnetic circuit structure is simple to manufacture, the processing complexity can be reduced to a certain extent, and meanwhile, the V-shaped and W-shaped hybrid magnetic circuit structure is better in mechanical strength, so that the output power of the motor is higher.
Each pole structure 3 may further include a pole groove 31 provided on the rotor core 2 in the axial direction, the pole groove 31 having a V-shape or a W-shape opening outward in a radial section of the rotor core 2, and all the magnets 32 in each pole structure 3 are provided in the pole groove 31. This arrangement makes the magnet 32 easy to form a V-shape or W-shape with an opening outward on a radial cross section of the rotor core 2, and at the same time, this built-in magnetic pole structure 3 makes the magnet 32 more stable, thereby making the permanent magnet synchronous motor more stable. In particular, the pole slots 31 may be further provided through the rotor core 2, which allows the magnet 32 to be larger in volume and the rotor mass to be more balanced.
The permanent magnet synchronous motor is preferably of a concentrated winding motor structure, that is, the number of phases of the permanent magnet synchronous motor is set to be m, the number of stator slots 12 is set to be Q, and the number of magnetic poles is set to be a, Q/(2 mA) =0.5. The permanent magnet synchronous motor with the structure can save the copper consumption of the motor end part so as to further improve the motor efficiency. The magnet of the invention can be further made of rare earth materials, and the residual magnetic field density Br of the magnet is more than or equal to 1.2T (Tesla). This ensures that the energy consumption of the permanent magnet synchronous motor of the invention is not too great, so that the efficiency of the permanent magnet synchronous motor of the invention is too low.
The stator groove 12 may have a tapered portion on the radially inner side, and the internal teeth 11 include an internal tooth body and teeth legs integrally provided on both sides of the internal tooth body in the circumferential direction, and adjacent teeth legs of adjacent two internal teeth 11 constitute the tapered portion. The reduced-diameter portion can prevent the winding wound on the internal teeth 11 from being separated from the internal teeth 11, thereby ensuring the safety of the permanent magnet synchronous motor.
The stator core 1 is preferably formed by laminating a plurality of silicon steel sheets; and the rotor core 2 is preferably formed by connecting a plurality of core pieces, each of which is uniformly provided with mounting holes 21 in the circumferential direction, the plurality of core pieces being connected to each other by rivets and the mounting holes 21. This arrangement greatly facilitates production and installation.
In one embodiment of the invention, parameters of a permanent magnet synchronous motor and a rotary compressor with the same are provided. Wherein the number of stator slots 12 is 9, the number of rotor poles is 6, the magnetic circuit structure is of a V-shaped structure, the stator outer diameter D 1＝90mm,D12/D1 = 0.57 of the stator, the rotor outer diameter D 2 = 51.5mm of the rotor, and the axial height L of the rotor is 46mm; the displacement P of the compressor is 10.3cm 3, corresponding to P/(D 2 2 x L) =0.84 and L/D 2 =0.089. The permanent magnet synchronous motor conforming to the parameters has high efficiency, proper rotor moment of inertia and low noise and good performance.
Furthermore, the present invention provides in another aspect a refrigeration system comprising a rotary compressor as described above.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a plurality of simple variants of the technical proposal of the invention can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the invention does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.
Claims (10)
1. The utility model provides a rotary compressor, includes casing and the permanent magnet synchronous motor who sets up in this casing, its characterized in that, permanent magnet synchronous motor includes:
A stator including a stator core (1) and a winding, the stator core (1) having a plurality of internal teeth (11), stator slots (12) being defined between adjacent internal teeth (11), the winding being arranged in the stator slots (12) and wound around the internal teeth (11);
a rotor rotatably mounted on an inner side of the stator with an outer circumferential surface thereof being spaced apart from an inner end surface of the inner teeth (11), the rotor including a rotor core (2) and a plurality of magnetic pole structures (3) circumferentially provided on the rotor core (2), each of the magnetic pole structures (3) including at least one magnet (32) and forming one magnetic pole, an extending direction of the magnet (32) in a radial section of the rotor core (2) having an angle with respect to a radial direction and a tangential direction of the rotor core (2), respectively;
The outer diameter of the rotor is D 2, the axial height of the rotor is L, the displacement of the rotary compressor is P, and the displacement P of the rotary compressor and the size of the permanent magnet synchronous motor satisfy the relation: P/(D 2 2. Times.L) is less than or equal to 0.085 and less than or equal to 0.11.
2. The rotary compressor of claim 1, wherein a relation between a rotor outer diameter D 2 of the rotor and an axial height L of the rotor is satisfied: L/D 2 is less than or equal to 0.9.
3. The rotary compressor of claim 1, wherein the stator has a stator outer diameter D 1, a stator inner diameter D 12, and both satisfy the relationship: d 12/D1 is more than or equal to 0.57.
4. Rotary compressor according to claim 1, characterized in that all the magnets (32) in each pole structure form an open outwards V-shape or W-shape in a radial section of the rotor core (2).
5. The rotary compressor according to claim 4, characterized in that the magnetic pole structure (3) further comprises a magnetic pole groove (31) provided on the rotor core (2) in the axial direction, the magnetic pole groove (31) being V-shaped or W-shaped with an opening outward in a radial cross section of the rotor core (2), the magnet (32) being provided in the magnetic pole groove (31).
6. The rotary compressor of claim 1, wherein the number of phases of the permanent magnet synchronous motor is m, the number of stator slots (12) is Q, the number of poles is a, and Q/(2 mA) =0.5.
7. The rotary compressor of claim 1, wherein the magnet (32) is made of rare earth material, and the residual magnetic field density Br of the magnet (32) is equal to or greater than 1.2T.
8. Rotary compressor according to claim 1, characterized in that the stator groove (12) has a pinch portion on the radially inner side.
9. The rotary compressor according to any one of claims 1 to 8, wherein the stator core (1) is formed by laminating a plurality of silicon steel sheets, the rotor core (2) is formed by connecting a plurality of core sheets, mounting holes (21) are uniformly arranged on each core sheet in the circumferential direction, and the plurality of core sheets are connected to each other by rivets and the mounting holes (21).
10. A refrigeration system comprising a rotary compressor as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810631653.8A CN108616177B (en) | 2018-06-19 | 2018-06-19 | Rotary compressor and refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810631653.8A CN108616177B (en) | 2018-06-19 | 2018-06-19 | Rotary compressor and refrigeration system |
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| Publication Number | Publication Date |
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| CN108616177A CN108616177A (en) | 2018-10-02 |
| CN108616177B true CN108616177B (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810631653.8A Active CN108616177B (en) | 2018-06-19 | 2018-06-19 | Rotary compressor and refrigeration system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20220002592A (en) | 2019-12-11 | 2022-01-06 | 안후이 메이즈 프리시전 매뉴팩처링 컴퍼니 리미티드 | Motors, compressors and air conditioners |
| CN110932422B (en) * | 2019-12-11 | 2022-04-01 | 安徽美芝精密制造有限公司 | Motor, compressor and refrigeration plant |
| CN110912297B (en) * | 2019-12-11 | 2022-04-01 | 安徽美芝精密制造有限公司 | Motor and compressor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208209654U (en) * | 2018-06-19 | 2018-12-07 | 广东美芝制冷设备有限公司 | Rotary compressor and refrigeration system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006144731A (en) * | 2004-11-24 | 2006-06-08 | Matsushita Electric Ind Co Ltd | Compressor |
| CN103023258A (en) * | 2013-01-10 | 2013-04-03 | 深圳市福义乐磁性材料有限公司 | Rare-earth permanent-magnet synchronous servo motor |
| FR3041185B1 (en) * | 2015-09-11 | 2017-09-01 | Valeo Equip Electr Moteur | STATOR OF ROTATING ELECTRICAL MACHINE WITH OPTIMIZED FILLING RATE |
| CN107528400B (en) * | 2017-09-30 | 2021-07-30 | 广东美芝制冷设备有限公司 | Motor rotors, permanent magnet motors and compressors |
| CN108011487A (en) * | 2018-01-31 | 2018-05-08 | 株洲罗伯特电机有限公司 | A kind of kart internal permanent magnet synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208209654U (en) * | 2018-06-19 | 2018-12-07 | 广东美芝制冷设备有限公司 | Rotary compressor and refrigeration system |
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