CN115864698B - Rotor and motor - Google Patents
Rotor and motorInfo
- Publication number
- CN115864698B CN115864698B CN202111123189.XA CN202111123189A CN115864698B CN 115864698 B CN115864698 B CN 115864698B CN 202111123189 A CN202111123189 A CN 202111123189A CN 115864698 B CN115864698 B CN 115864698B
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- rotor
- segment
- arc
- center point
- rotor core
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
一种转子及电机，包括有一转子铁芯，其中心处设有一供安装电机心轴的轴孔，该转子铁芯以轴孔为中心平均区分成若干个磁力区块，而各该磁力区块的外轮廓沿周向依次具有相连接的一弧线段、二连接段及一凹陷段；该弧线段与该连接段为不同圆心及不同圆弧半径所构成，致使该转子的外轮廓整体呈现不整圆结构，利用不整圆结构能优化气隙磁通密度分布，使气隙磁通趋近弦波，同时改善顿转转矩与转矩涟波，以及该凹陷段可限缩磁通流通路径，使磁通往理想磁路流通，减少漏磁发生与优化气密磁通密度分布；藉此，达到大幅降低转矩涟波与顿转转矩，改善噪音并提升电机的输出力矩的稳定度。
A rotor and motor include a rotor core with a shaft hole at its center for mounting a motor spindle. The rotor core is evenly divided into several magnetic blocks centered on the shaft hole. The outer contour of each magnetic block has a connected arc segment, two connecting segments, and a recessed segment along its circumferential direction. The arc segment and the connecting segment are composed of different centers and different radii, resulting in an overall non-circular structure of the rotor's outer contour. This non-circular structure optimizes the air gap magnetic flux density distribution, making the air gap magnetic flux approach a sine wave, while improving torque ripple and torque slippage. The recessed segment restricts the magnetic flux flow path, allowing the magnetic flux to flow through an ideal magnetic circuit, reducing leakage flux and optimizing the air-tight magnetic flux density distribution. This significantly reduces torque ripple and torque slippage, improves noise, and enhances the stability of the motor's output torque.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a rotor and a motor.
Background
According to the prior rotary compressor mainly comprises an exhaust pipe, a shell, a motor (stator and rotor), a transmission shaft, an upper bearing, a silencing cover, a compression unit (cylinder body and piston), a lower bearing, a bottom cover, an outlet pipe, a liquid reservoir and an inlet pipe. The basic working principle of the compressor is that when the compressor is electrified, the stator generates a magnetic field to enable the rotor to rotate and drive the transmission shaft to enable the piston to eccentrically move in the cylinder body, so that a low-temperature low-pressure gas refrigerant medium is compressed into high-temperature high-pressure gas, and the high-temperature high-pressure gas is discharged into the shell from the cylinder body through the silencing cover. Then the air is discharged into a refrigeration circulation system through an outlet pipe after passing through the trimming on the outer side of the stator and the gap between the rotors.
As is well known, permanent magnet synchronous motors are widely used in home appliances such as air conditioning compressors due to their high efficiency. A more common method for improving the energy of the motor is to improve the air-gap field of the motor part, however, when the method is adopted, the harmonic wave of the air-gap field is also increased, so that noise and vibration of the motor and the compressor are bad.
In view of the above, the present inventors have made intensive studies and have made an effort to solve the above-mentioned problems in view of the above-mentioned prior art, and have made an improvement of the present inventors.
Disclosure of Invention
Therefore, the present invention is directed to a motor with a substantially reduced torque ripple and cogging torque, improved air gap flux waveform and reduced magnetic leakage, which is beneficial to reducing vibration noise and improving stability of output torque of the motor, so as to solve the above-mentioned problems of the prior art.
In order to achieve the above-mentioned object, the present invention provides a rotor, comprising a rotor core, the rotor core is a cylinder with a predetermined length, a shaft hole for installing a motor spindle is arranged at the center of the rotor core, the shaft hole penetrates through two ends of the rotor core, the rotor is characterized in that:
The rotor core is divided into a plurality of magnetic force blocks by taking a shaft hole as a center, the outer contour of each magnetic force block is sequentially provided with an arc line segment, two connecting segments and a concave segment which are connected in the circumferential direction, the arc line segment is adjacent to the space between the two connecting segments, the concave segment is adjacent to the connecting segment, the arc radius of the arc line segment is R1, the arc radius of the connecting segment is R2, the distance value between the concave segment and the center point of the rotor core is d3, and the arc line segment and the connecting segments are formed by different center circles and different arc radii, so that the whole outer contour of the rotor presents an uneven round structure.
Preferably, a first imaginary line is defined, the first imaginary line extends from the center point of the rotor core through the center point of the arc line, the center point of the arc line is located on the first imaginary line, the distance between the center point of the arc line and the center point of the rotor core is d1, the distance between the center point of the rotor core and the top end of the arc line is d2, and d1< d2 is satisfied.
Preferably, the distance value between the center point of the arc line and the center point of the rotor core is d1, and the radius of the arc of the connecting section is R2, and d1< R2 is satisfied.
Preferably, the radius of the arc of the connecting section is R2, the distance between the center point of the rotor core and the top end of the arc section is d2, the distance between the concave section and the center point of the rotor core is d3, and d2+.r2 > d3 is satisfied.
Preferably, the rotor further includes a plurality of magnets, and the magnets are respectively disposed at each magnetic force block of the rotor core.
Preferably, each magnetic force block is provided with a magnet groove, the magnet groove penetrates through the bottom surface of the magnetic force block along the top surface of the magnetic force block, and the magnet groove is used for installing the magnet.
Preferably, a second imaginary line is defined, the second imaginary line extends from the center point of the rotor core to the center point of the concave section, wherein the bottom end of the concave section is in a straight line design, the straight line length of the bottom end of the concave section is a1, and the connecting line distance value of the midpoint of the broadside between the two magnets is a2, which satisfies the following relation:
Preferably, the shape of the concave section is any shape.
Preferably, the magnet slot of each magnetic force block is in any shape of long strip or V.
According to another aspect of the present invention, there is also provided an electric motor, characterized by comprising:
A stator
The rotor is arranged inside the stator and can rotate relative to the stator.
According to the structure, the beneficial effects of the invention are as follows:
1. A rotor is provided that includes a rotor core and a magnet. The rotor core is divided into a plurality of magnetic force blocks by taking a shaft hole as a center, each magnetic force block is provided with a magnet groove, the magnet is provided with a magnet for forming a magnetic pole, the outer outline of each magnetic force block is sequentially provided with an arc line segment, two connecting segments and a concave segment which are connected along the circumferential direction, the arc line segment is adjacent to the two connecting segments, the concave segment is adjacent to the connecting segment, a first imaginary line is defined by extending through the center point of the arc line segment through the center point of the rotor core, the center point of the arc line segment is positioned on the first imaginary line, but is not concentric with the center point of the rotor core, the arc line segment and the connecting segments are formed by different circle centers and different arc radiuses, so that the whole outline of the rotor presents an uneven circular structure.
2. A rotor is provided that includes a rotor core and a magnet. The rotor core is divided into a plurality of magnetic force blocks by taking a shaft hole as a center, each magnetic force block is provided with a magnet groove, magnets are arranged and form magnetic poles, the outer contour of each magnetic force block is sequentially provided with an arc line segment, two connecting segments and a concave segment which are connected along the circumferential direction, the arc line segment is adjacent to the two connecting segments, the concave segment is adjacent to the connecting segment, a second imaginary line is defined by extending through the center point of the concave segment through the center point of the rotor core, the bottom end of the concave segment is in a linear design, the linear length of the bottom end of the concave segment is a1, and the connecting distance value of the midpoint of the wide edge between the two magnets is a2, so that the following relational expression is satisfied: the concave section is reduced to be closed, so that the concave section positioned on the second imaginary line can limit the magnetic flux flow path, so that magnetic flux flows to an ideal magnetic circuit, the magnetic leakage is reduced, and the airtight magnetic flux density distribution is optimized.
Drawings
Fig. 1 is a top view (one) of the rotor of the present invention.
Fig. 2 is an enlarged view of a portion of fig. 1 in accordance with the present invention.
Fig. 3 is a top view (two) of the rotor of the present invention.
Fig. 4 is a top view of the motor of the present invention.
1. Rotor 11 rotor core
110. Shaft hole 111 magnetic force block
1111. Magnet slot 112 arc section
113. Recessed section of connecting section 114
12. Magnet
2. Stator
A1 Length a2 distance
D first imaginary line D1 pitch
D2 Distance d3 distance
Q second imaginary line
R1 arc radius R2 arc radius
Detailed Description
For the purpose of understanding the nature, content and advantages of the present invention and the manner in which the features, content and advantages of the invention are obtained, the invention will now be described in more detail with reference to the drawings, in which the drawings are used for illustrative purposes only and to assist in the description, and are not necessarily true to scale and precise arrangements of the components within which the invention may be practiced, and therefore should not be construed as limiting the scope of the invention in its practical terms with respect to the scale and arrangement of the drawings appended hereto.
The advantages, features and technical approaches to the present invention will be more readily understood by reference to the following detailed description of exemplary embodiments and the accompanying drawings, and the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed to provide a thorough and complete understanding of the present invention by those skilled in the art, and will only be defined by the appended claims.
First embodiment
First, referring to fig. 1 to 3, fig. 1 is a top view (first) of the rotor of the present invention, fig. 2 is a partial enlarged view of fig. 1 of the present invention, and fig. 3 is a top view (second) of the rotor of the present invention.
The rotor 1 includes a rotor core 11, the rotor core 11 is a cylinder with a predetermined length, a shaft hole 110 for installing a motor spindle (not shown) is provided at the center of the rotor core 11, and the shaft hole 110 penetrates through two ends of the rotor core 11, namely, an upper end and a lower end of the rotor core 11. The rotor core 11 of the present invention is formed by sequentially overlapping a plurality of silicon steel sheets from bottom to top to form the cylindrical body, and an inner hole is formed at the center of each silicon steel sheet, and the rotor core 11 is overlapped to form a shaft hole 110 matched with a motor spindle (not shown).
The rotor core 11 is divided into a plurality of magnetic force blocks 111 with the shaft hole 110 as a center, and the outer contour of each magnetic force block 111 is sequentially provided with an arc line segment 112, two connecting segments 113 and a concave segment 114 which are connected along the circumferential direction, wherein the arc line segment 112 is adjacent to the space between the two connecting segments 113, the concave segment 114 is adjacent to the connecting segment 113, the arc radius of the arc line segment 112 is R1, the arc radius of the connecting segment 113 is R2, the distance value between the concave segment 114 and the center point of the rotor core 11 is d3, and the arc line segment 112 and the connecting segment 113 are formed by different centers and different arc radii, so that the whole outer contour of the rotor 1 presents a non-uniform structure.
By the above structure, the following will be further described:
In this embodiment, a first imaginary line D is defined, the first imaginary line D extends from the center point of the rotor core 11 through the center point of the arc segment 112, the center point of the arc segment 112 is located on the first imaginary line D, i.e. any point on the first imaginary line D but not concentric with the center point of the rotor core 11, wherein the distance between the center point of the arc segment 112 and the center point of the rotor core 11 is D1, the distance between the center point of the rotor core 11 and the top end of the arc segment 112 is D2, and D1< D2 is satisfied, in other words, the center point of the arc segment 112 and the center point of the rotor core 11 are not concentric.
In the foregoing, the distance between the center point of the arc segment 112 and the center point of the rotor core 11 is d1, the radius of the arc of the connecting segment 113 is R2, and d1< R2 is satisfied, in other words, the distance between the center point of the arc segment 112 and the center point of the rotor core 11 is d1, and the distance d1 does not exceed the radius of the arc R2 of the connecting segment 113.
Furthermore, the radius of the arc of the connecting segment 113 is R2, the distance between the center point of the rotor core 11 and the top end of the arc segment 112 is d2, the distance between the concave segment 114 and the center point of the rotor core 11 is d3, and d2+.r2 > d3 is satisfied, in other words, the distance d2 between the center point of the rotor core 11 and the top end of the arc segment 112 is greater than or equal to the radius of the arc R2 of the connecting segment 113, and the radius of the arc R2 of the connecting segment 113 is greater than the distance d3 between the concave segment 114 and the center point of the rotor core 11.
In this embodiment, the rotor 1 further includes a plurality of magnets 12, the magnets 12 are disposed at the magnetic force blocks 111 of the rotor core 11, a magnet slot 1111 is disposed in the magnetic force block 111, the magnet slot 1111 penetrates through the bottom surface of the magnetic force block 111 along the top surface of the magnetic force block 111, the magnet slot 1111 is provided for the magnets 12 to be mounted, and the shape of the magnet slot 1111 of the magnetic force block 111 is any one of a long strip shape (as shown in fig. 1) or a V shape (as shown in fig. 3).
In this embodiment, a second imaginary line Q is defined, the second imaginary line Q extends from the center point of the rotor core 11 through the center point of the recessed section 114, wherein the bottom end of the recessed section 114 is a straight line, i.e. the bottom surface of the recessed section 114, and the length of the straight line at the bottom end of the recessed section 114 is a1, and the distance between the midpoint of the wide sides of the two magnets 12 is a2 (as shown in fig. 2), which satisfies the following relationship: The shape of the concave section 114 is any shape, in other words, the concave section 114 focuses on that the bottom end is designed in a straight line, and the shape of the two sides, i.e. the two side ends, of the concave section 114 is not limited, and the shape may be straight (extending from the bottom end upwards and straight, i.e. the angle between the bottom end and the two ends is 90 degrees), arc (e.g. outer arc or inner arc), inclined (extending from the bottom end upwards and outwards, i.e. the angle between the bottom end and the two ends is greater than 90 degrees), or inclined from the bottom end upwards and inwards, i.e. the angle between the bottom end and the two ends is less than 90 degrees), or any other shape, so that the concave section 114 may be any shape, not limited to a single shape, but the angle between the bottom end and the two side ends of the concave section 114 in the present invention is 90 degrees, i.e. the concave section 114 is rectangular in this figure, under the condition, the concave section 114 is prevented from being in a closed state.
Second embodiment
Referring to fig. 4, fig. 4 is a top view of the motor according to the present invention, the motor includes a stator 2 and a rotor 1, the rotor 1 is the rotor 1, and the whole structure of the rotor 1 is described in the foregoing description, so that the description is omitted. The rotor 1 is disposed inside the stator 2, and the rotor 1 can rotate relative to the stator 2.
In this structure, the rotor core 11 is divided into a plurality of magnetic force blocks 111 by taking the shaft hole 110 as the center, each magnetic force block 111 is provided with a magnet slot 1111, the magnet 12 is arranged in the magnet slot 1111 and forms a magnetic pole, the outer contour of each magnetic force block 111 is provided with an arc line segment 112, two connecting segments 113 and a concave segment 114 which are connected in turn along the circumferential direction, the arc line segment 112 is adjacent between the two connecting segments 113, the concave segment 114 is adjacent to the connecting segments 113, a first imaginary line D is defined by extending through the center point of the arc line segment 112 from the center point of the rotor core 11, a second imaginary line Q is defined by extending through the center point of the concave segment 114 from the center point of the rotor core 11, the center point of the arc line segment 112 is positioned on the first imaginary line D, but is not concentric with the center point of the rotor core 11, so that the arc line segment 112 and the connecting segments 113 are different in radius, the whole outer contour of the rotor 1 presents a non-circular structure, the magnetic flux density is optimized, and the magnetic flux density is enabled to approach the circular arc and the magnetic flux density is enabled to be the magnetic flux density of the air gap.
Furthermore, the center point of the rotor core 11 extends through the center point of the concave section 114 to define a second imaginary line Q, wherein the bottom end of the concave section 114 is of a straight line design, the straight line length of the bottom end of the concave section 114 is a1, and the connecting distance value between the wide-side midpoints of the two magnets 12 is a2, which satisfies the following relationship: The concave section 114 is reduced from closing, so that the concave section 114 on the second imaginary line Q can constrict the flux flow path, circulate the magnetic flux to the ideal magnetic circuit, reduce the occurrence of leakage magnetic flux and optimize the airtight magnetic flux density distribution.
In view of the above, in order to reduce the fluctuation of the output torque of the motor, that is, to reduce the torque ripple and cogging torque of the motor, the appearance profile of the rotor 1 is modified, and the main purpose of the invention is to optimize the air gap magnetic flux density distribution, so that the wave motion approaches to the sine wave, to reduce the air gap magnetic field harmonic wave and the torque fluctuation, thereby achieving the purpose of improving the vibration noise of the motor.
However, the foregoing is merely illustrative of the present invention and, as such, it is not intended to limit the scope of the invention, but rather to cover all modifications and variations within the scope of the present invention as defined by the appended claims and their equivalents.
Claims (8)
1. The utility model provides a rotor, includes a rotor core, and this rotor core is a cylinder body that has predetermined length, and center department is equipped with a shaft hole that supplies installation motor mandrel, and this shaft hole link up in the both ends of this rotor core, its characterized in that:
The rotor iron core is divided into a plurality of magnetic force blocks by taking a shaft hole as a center, wherein the outer contour of each magnetic force block is provided with an arc line segment, two connecting segments and a concave segment which are connected in the circumferential direction, the arc line segment is adjacent to the space between the two connecting segments, the concave segment is adjacent to one end of the connecting segment, which is far away from the arc line segment, wherein the concave segment is in a concave shape and comprises a bottom end and two side surfaces, the two side surfaces extend upwards from the bottom end and are connected with one end of the connecting segment, the arc radius of the arc line segment is R1, the arc radius of the connecting segment is R2, the space value between the concave segment and the center point of the rotor iron core is d3, the arc line segment and the connecting segment are formed by different centers of circles and different arc radii, so that the outer contour of the rotor is in a non-uniform round structure, and the rotor further comprises a plurality of magnets, which are respectively arranged at the magnetic force blocks of the rotor iron core;
defining a second imaginary line extending from the center point of the rotor core through the center point of the recessed section, wherein the bottom end of the recessed section is of straight line design, the straight line length of the bottom end of the recessed section is a1, the connecting line distance value of the midpoint of the broadsides between adjacent magnets of two adjacent magnetic force blocks is a2, which satisfies the following relation 1< <5。
2. The rotor of claim 1, wherein a first imaginary line is defined, the first imaginary line extending from a center point of the rotor core through a center point of the arc segment, the center point of the arc segment being located on the first imaginary line, wherein a distance between the center point of the arc segment and the center point of the rotor core has a value d1, and a distance between the center point of the rotor core and a top end of the arc segment has a value d2, and d1< d2 is satisfied.
3. The rotor of claim 2, wherein a distance between a center point of the arc segment and a center point of the rotor core is d1, and a radius of the arc of the connecting segment is R2, and d1< R2 is satisfied.
4. A rotor as claimed in claim 3, wherein the radius of the arc of the connecting section is R2, the distance between the center point of the rotor core and the top end of the arc section is d2, the distance between the concave section and the center point of the rotor core is d3, and d2+_r2 > d3 is satisfied.
5. The rotor of claim 1 wherein each of the magnet blocks has a magnet slot extending through a bottom surface of the magnet block along a top surface of the magnet block, the magnet slot being configured for mounting the magnet.
6. A rotor according to claim 1, wherein the shape of the recessed section is any shape.
7. The rotor of claim 5 wherein the magnet slot of each magnetic force block is either elongated or V-shaped.
8. An electric machine, comprising:
A stator
A rotor according to any one of claims 1-7, the rotor being disposed within the stator, the rotor being rotatable relative to the stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111123189.XA CN115864698B (en) | 2021-09-24 | 2021-09-24 | Rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111123189.XA CN115864698B (en) | 2021-09-24 | 2021-09-24 | Rotor and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115864698A CN115864698A (en) | 2023-03-28 |
| CN115864698B true CN115864698B (en) | 2025-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111123189.XA Active CN115864698B (en) | 2021-09-24 | 2021-09-24 | Rotor and motor |
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| Country | Link |
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| CN (1) | CN115864698B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742879A (en) * | 2019-02-02 | 2019-05-10 | 宁波安信数控技术有限公司 | A kind of rotor structure for permanent magnet motor |
| CN216290391U (en) * | 2021-09-24 | 2022-04-12 | 瑞智精密股份有限公司 | Rotor and motor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2800243B8 (en) * | 2011-12-26 | 2018-02-28 | Mitsubishi Electric Corporation | Rotor of permanent-magnet embedded motor, and compressor, blower, and refrigerating/air conditioning device using the rotor |
| CN204179780U (en) * | 2014-10-21 | 2015-02-25 | 瑞智精密股份有限公司 | Rotor structure |
| CN110752685A (en) * | 2019-09-30 | 2020-02-04 | 华为技术有限公司 | Rotor core, rotor core, rotor, permanent magnet synchronous motor and related products |
| CN110768425B (en) * | 2019-10-31 | 2025-01-14 | 珠海凌达压缩机有限公司 | A motor based on rotor round edge design and an electrical appliance using the motor |
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2021
- 2021-09-24 CN CN202111123189.XA patent/CN115864698B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742879A (en) * | 2019-02-02 | 2019-05-10 | 宁波安信数控技术有限公司 | A kind of rotor structure for permanent magnet motor |
| CN216290391U (en) * | 2021-09-24 | 2022-04-12 | 瑞智精密股份有限公司 | Rotor and motor |
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