CN112701820A - Motor rotor, motor and household appliance - Google Patents
Motor rotor, motor and household appliance Download PDFInfo
- Publication number
- CN112701820A CN112701820A CN202011533055.0A CN202011533055A CN112701820A CN 112701820 A CN112701820 A CN 112701820A CN 202011533055 A CN202011533055 A CN 202011533055A CN 112701820 A CN112701820 A CN 112701820A
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- magnet
- groups
- axial direction
- motor
- permanent magnets
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- 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)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides a motor rotor, a motor and a household appliance. The motor rotor comprises a mandrel, a plurality of groups of magnet groups and a fastening sleeve, wherein the plurality of groups of magnet groups are arranged on the periphery of the mandrel along the circumferential direction of the mandrel, and the fastening sleeve is wound outside the plurality of groups of magnet groups along the circumferential direction of the motor rotor; the magnet group comprises at least two permanent magnets which are arranged along the axial direction and are separated from each other, and in the magnet group, a boundary is formed between every two adjacent permanent magnets; the boundary of at least one magnet group is at a different position in the axial direction than the boundary of another adjacent magnet group. The motor comprises a motor rotor and the household appliance comprises a motor. The invention makes the boundary of the permanent magnet distributed at least at two different positions in the axial direction, thereby dispersing the stress of the fastening sleeve, solving the problem of stress concentration, and keeping the original heat dispersion because no weftless tape is added, and not causing the problem of heat concentration.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor rotor of a high-speed permanent magnet motor, a motor and a household appliance.
Background
The existing motor rotor of the high-speed permanent magnet motor comprises a mandrel, permanent magnet blocks and a sheath, wherein the permanent magnet blocks are arranged on the periphery of the mandrel along the circumferential direction of the mandrel, the permanent magnet blocks are arranged in a segmented mode along the axial direction for increasing the power of the motor, in the axial direction, a boundary is formed between every two adjacent permanent magnet blocks, and the boundaries between a plurality of permanent magnet blocks in the circumferential direction are located on the same boundary.
The sheath is formed by binding high-strength fibers such as carbon fibers or glass fibers along the circumferential direction, and the sheath needs to bear the centrifugal force of the permanent magnet blocks and is in a state of being tightened and bearing contact stress. Because the boundaries between the permanent magnet blocks are all positioned on the same boundary surface, namely, the boundaries are equal in height in the axial direction, the peripheral edges and the corners of the permanent magnet blocks generate acting force on the high-strength fibers in the tightening state at the axial position to cause stress concentration, and the structural strength of the rotor has a problem.
In order to solve the stress concentration problem, the motor rotor is additionally provided with weftless tapes, grooves are formed on two sides of a boundary of the permanent magnet block to accommodate the weftless tapes, and the weftless tapes are wound on the boundary and two sides of the boundary along the circumferential direction. Although the problem of stress concentration is solved by the aid of the weftless tape, the problem of thermal demagnetization of the permanent magnet block due to heat concentration caused by poor heat dissipation performance of the weftless tape is solved, and reliability of the rotor is reduced.
Disclosure of Invention
A first object of the present invention is to provide a magnet axially segmented electric machine rotor that effectively addresses the stress concentration problem without introducing heat concentration problems.
A second object of the present invention is to provide a high speed permanent magnet machine that effectively addresses the stress concentration problem without introducing heat concentration problems.
A third object of the present invention is to provide a household appliance having the above-mentioned high-speed permanent magnet motor.
The motor rotor provided by the first object of the invention comprises a mandrel, a plurality of groups of magnet groups and a fastening sleeve, wherein the plurality of groups of magnet groups are arranged on the periphery of the mandrel along the circumferential direction of the mandrel, and the fastening sleeve is wound outside the plurality of groups of magnet groups along the circumferential direction of the motor rotor; the magnet group comprises at least two permanent magnets which are arranged along the axial direction and are separated from each other, and in the magnet group, a boundary is formed between every two adjacent permanent magnets; the boundary of at least one magnet group is at a different position in the axial direction than the boundary of another adjacent magnet group.
According to the scheme, the division positions of the permanent magnets are at least distributed on two interfaces, namely, the permanent magnets are located at different axial positions, so that stress of the fastening sleeve is dispersed, the problem of stress concentration is solved, original heat dissipation performance is kept because no weftless tape is added, and the problem of heat concentration is avoided.
Further, the dividing point of any two adjacent magnet groups is respectively on different axial positions.
As seen from the above, the arrangement makes the boundaries of the plurality of magnet groups in a discontinuous staggered arrangement in the circumferential direction, further disperses the contact stress and further solves the problem of stress concentration.
The further proposal is that the magnet group comprises n permanent magnets, wherein n is more than or equal to 3; at least n-1 adjacent magnet groups are respectively positioned at different axial positions at each boundary.
Another further scheme is that the magnet group comprises n permanent magnets; on n adjacent magnet groups, each boundary is respectively located at different axial positions.
It can be seen from the above that based on the permutation and combination, when n permanent magnets have different lengths on the permanent magnet, n permanent magnets are arranged differently, at most n combinations can be arranged, and any two boundaries on the n combinations are not at the same axial height. Therefore, the arrangement can ensure that the dividing position is distributed on different axial positions as much as possible, and the problem of stress concentration of the fastening sleeve is solved to a greater extent.
In the magnet group, the length of one permanent magnet in the axial direction or the sum of the lengths of the permanent magnets in the axial direction is not equal to the length of the rest permanent magnets in the axial direction or the sum of the lengths of the permanent magnets in the axial direction. .
As can be seen from the above, in the magnet assembly, if the axial length of one permanent magnet or the axial lengths of the permanent magnets are equal to the sum of the axial lengths of the remaining permanent magnets, when the permanent magnets in the magnet assembly are arranged in a combined manner, there is a possibility that the arrangement order is different but the boundary is located at the same axial position. Therefore, the arrangement can avoid the situation that the arrangement sequence is different but the boundary is positioned at the same axial position, and the assembly difficulty is reduced on the premise of solving the problem of stress concentration.
Further, the lengths of any two permanent magnets in the axial direction are not equal.
Therefore, any two boundary positions on the rotor are located at different axial positions, and the problem of stress concentration is solved to the maximum extent.
The motor rotor further comprises an axial retaining ring sleeved outside the mandrel, and the axial retaining ring limits the plurality of magnet groups from the axial direction.
Therefore, the axial baffle ring is used for fixing the plurality of magnet groups, and the stability of the motor rotor is improved.
The further proposal is that in the radial direction of the motor rotor, the permanent magnet is provided with an outer side surface and an inner side surface which are oppositely arranged; the outer side surface and the inner side surface are both arc surfaces.
In a further embodiment, the outer lateral surfaces are located on the same cylindrical surface.
Therefore, the arrangement can ensure the integrity of the outer surface formed by the plurality of magnet groups, and avoid the formation of dislocation bulges to increase stress concentration points.
The motor provided by the second object of the invention comprises a motor rotor, and the motor rotor adopts the motor rotor.
The third object of the invention is to provide a household appliance comprising a motor, wherein the motor adopts the motor.
Drawings
Fig. 1 is a structural view of a first embodiment of a rotor of a motor of the present invention without a fastening sleeve.
Fig. 2 is a side view of a first embodiment of the rotor of the motor of the present invention.
Fig. 3 is a structural view of a permanent magnet in a first embodiment of a rotor of an electric machine according to the invention.
Fig. 4 is an expanded view of a plurality of sets of magnet groups in a first embodiment of a rotor for an electric machine according to the invention.
Fig. 5 is an expanded view of a plurality of sets of magnet sets in a second embodiment of a rotor for an electric machine according to the invention.
Fig. 6 is an expanded view of a plurality of sets of magnet groups in a third embodiment of a rotor for an electric machine according to the invention.
Detailed Description
First embodiment of rotor of electric machine
Referring to fig. 1 to 3, fig. 1 is a structural view of a first embodiment of a rotor of a motor of the present invention with a fastening sleeve removed, fig. 2 is a side view of the first embodiment of the rotor of the motor of the present invention, and fig. 3 is a structural view of a permanent magnet in the first embodiment of the rotor of the motor of the present invention. The invention provides a motor rotor of a high-speed permanent magnet motor, the high-speed permanent magnet motor with the motor rotor, and a household appliance with the high-speed permanent magnet motor. The key point of the motor rotor provided by the invention is the arrangement mode of a plurality of permanent magnets on the motor rotor.
The motor rotor comprises a mandrel 1, an axial baffle ring 2, a plurality of magnet groups 3 and a fastening sleeve 4. The mandrel 1 is made of a magnetic conductive material; the two axial baffle rings 2 are sleeved on the two axial sides of the mandrel 1 and are in interference fit with the mandrel 1; each magnet group 3 comprises a first permanent magnet 31 and a second permanent magnet 32, and the first permanent magnet 31 and the second permanent magnet 32 are both permanent magnets of the invention and are both magnetic steels; the fastening sleeve 4 is made of high-strength alloy or high-strength fiber materials such as carbon fiber and Kevlar fiber.
The first permanent magnets 31 and the second permanent magnets 32 of the plurality of magnet groups 3 are adhered to the mandrel 1 through anaerobic adhesive, the plurality of magnet groups 3 are arranged along the circumferential direction of the mandrel 1, the first permanent magnets 31 and the second permanent magnets 32 in each magnet group 3 are sequentially arranged along the axial direction of the motor rotor, and a boundary 30 is formed between the first permanent magnets 31 and the second permanent magnets 32.
The first permanent magnet 31 and the second permanent magnet 32 have the same cross-sectional profile in the axial direction but have different lengths, taking the second permanent magnet 32 as an example, the projection of the second permanent magnet 32 in the axial direction of the motor rotor is similar to a sector, the second permanent magnet 32 has an outer side 321 and an inner side 322 which are oppositely arranged in the radial direction of the motor rotor, the outer side 321 and the inner side 322 are both arc surfaces, and the outer sides 321 of all the first permanent magnets 31 and the outer sides 321 of the second permanent magnets 32 on the motor rotor are located on the same cylindrical surface. In addition, the end face 323 of the second permanent magnet 32 in the axial direction of the motor rotor is a flat surface.
When the plurality of magnet groups 3 are all adhered to the outside of the mandrel 1, the axial retaining rings 2 are sleeved, and the two axial retaining rings 2 limit the plurality of magnet groups 3 from two axial sides. The fastening sleeve 4 is then slipped over the axial baffle ring 2 and the plurality of magnet assemblies 3.
Referring to fig. 4, fig. 4 is an expanded view of a plurality of magnet sets in a first embodiment of the rotor of the motor according to the present invention, illustrating that the z-axis direction is the axial direction of the rotor of the motor. The present embodiment includes eight sets of magnet groups 3, and each set of magnet groups 3 is composed of a first permanent magnet 31 and a second permanent magnet 32 having different lengths. When the first permanent magnet 31 and the second permanent magnet 32 are arranged in the axial direction, the boundary 30 between the first permanent magnet 31 and the second permanent magnet 32 can be brought to the first position 101 or the second position 102 in the axial direction by interchanging the positions in the axial direction.
In this embodiment, the two adjacent magnet groups 3 are arranged differently, so that one of the boundaries 30 of the two adjacent magnet groups 3 is located at the first position 101, and the other is located at the second position 102. When eight magnet groups 3 are arranged, a plurality of interfaces 30 are staggered at a first position 101 and a second position 102.
Because the fastening sleeve 4 is made of high-strength fiber materials, after the fastening sleeve is sleeved on the peripheries of the plurality of groups of magnet groups 3, the fastening sleeve 4 needs to bear the centrifugal force of the plurality of permanent magnets and is in a state of being tightened and bearing contact stress, and the boundary 30 formed between the edges of the permanent magnets can generate larger stress on the fastening sleeve 4. Therefore, in the present embodiment, the boundaries 30 between the plurality of permanent magnets are arranged in a staggered manner in the axial direction, so that the stress of the fastening sleeve 4 is dispersed, the problem of stress concentration is solved, and the original heat dissipation performance is maintained without adding a weftless tape, and the problem of heat concentration is not caused.
Second embodiment of rotor for electric machine
Referring to fig. 5, fig. 5 is an expanded view of a plurality of sets of magnet assemblies in a second embodiment of a rotor for an electric machine according to the present invention. The present embodiment comprises eight sets of magnet groups 5, each set of magnet groups 5 comprising three permanent magnets: the first permanent magnet 51, the second permanent magnet 52 and the third permanent magnet 53 are different in length in the axial direction (z-axis direction), and the sum of the axial lengths of any two of the first permanent magnet 51, the second permanent magnet 52 and the third permanent magnet 53 is not equal to the axial length of the third permanent magnet.
When a plurality of sets of magnet groups 5 are arranged, the first permanent magnets arranged in each set of magnet groups 5 should not be the same according to the principle that the boundaries 50 of adjacent magnet groups 5 are located at different positions in the axial direction, otherwise, the boundaries are located at the same positions in the axial direction, and therefore, the first permanent magnets of the adjacent three sets of magnet groups 5 are respectively the first permanent magnet 51, the second permanent magnet 52 and the third permanent magnet 53.
The remaining permanent magnets of the adjacent three groups of magnets 5 are then arranged. Since the sum of the axial lengths of any two of the first permanent magnet 51, the second permanent magnet 52 and the third permanent magnet 53 is not equal to the axial length of the third permanent magnet, by adjusting the sequence of the remaining permanent magnets, the six interfaces 50 in the three magnet groups 5 can be located at the first position 111, the second position 112, the third position 113, the fourth position 114, the fifth position 115 and the sixth position 116, which are different in the axial direction, respectively.
Since each set of magnet groups 5 only includes three permanent magnets with different lengths, after the above three adjacent sets of magnet groups 5 are arranged, the next magnet group 5 must be arranged beginning with the first permanent magnet 51, the second permanent magnet 52 or the third permanent magnet 53, and therefore, it is inevitable that some of the boundaries 50 are at the same axial position as the boundaries 50 in the previous three sets of magnet groups 5, for example, the first boundary 50 of the fourth set of magnet groups 5 and the first boundary 50 of the first set of magnet groups 5 are both at the first position 111.
Therefore, after the arrangement of the three front groups of magnet groups 5 is completed, the arrangement of the next magnet groups 5 can be performed according to the arrangement of the three front groups of magnet groups 5, so that the dividing points 50 are distributed on six axial positions more uniformly, the stress is further effectively dispersed, and the structural strength of the motor rotor is ensured.
Third embodiment of rotor for electric machine
Referring to fig. 6, fig. 6 is an expanded view of a plurality of sets of magnet assemblies in a third embodiment of a rotor for an electric machine according to the present invention. In this embodiment, the magnet assembly 6 includes four permanent magnets having different axial lengths: a first permanent magnet 61, a second permanent magnet 62, a third permanent magnet 63 and a fourth permanent magnet 64, and likewise, the axial length of one, the sum of two or three lengths in the axial direction is not equal to the sum of the remaining three, two or one permanent magnet.
As for the same reason as in the previous embodiment, since each magnet group 6 includes four permanent magnets, it is possible to arrange four adjacent magnet groups 6 at most and to locate twelve boundaries 60 common to the four magnet groups 6 at twelve different positions in the axial direction, respectively.
According to the above three embodiments, the more permanent magnets the magnet assembly is divided into, the more dispersed the distribution of the plurality of boundaries in the axial direction. In addition, if a rule is added on the basis that the length of one permanent magnet in the axial direction or the sum of the lengths of the permanent magnets in the axial direction is not equal to the length of the other permanent magnets in the axial direction or the sum of the lengths of the permanent magnets in the axial direction in the magnet group, the technical effect that each boundary on the motor rotor is respectively located at different positions in the axial direction can be achieved, and the boundaries are dispersed in the axial direction to the maximum extent.
In other embodiments, the magnet assembly includes 5 or more permanent magnets.
In other embodiments, the plurality of permanent magnets in the magnet group have different axial lengths, but do not follow the setting rule of "the length of one permanent magnet in the axial direction or the sum of the lengths of the plurality of permanent magnets in the axial direction in the magnet group is not equal to the sum of the lengths of the other permanent magnet(s) in the axial direction".
When each magnet group comprises n permanent magnets, and the n permanent magnets are arranged according to the rule that the length of one permanent magnet in the axial direction or the sum of the lengths of the permanent magnets in the axial direction in the magnet group is not equal to the length of the other permanent magnets in the axial direction or the sum of the lengths of the permanent magnets in the axial direction in the magnet group, although at most different positions in the axial direction at each boundary on the n magnet groups can be achieved, in other embodiments, according to design requirements or performance requirements, only n-1 adjacent magnet groups, n-2 adjacent magnet groups or a smaller number of adjacent magnet groups (at least two groups) can be arranged, and each boundary is respectively at different positions in the axial direction.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (11)
1. The motor rotor comprises a mandrel, a plurality of groups of magnet groups and a fastening sleeve, wherein the plurality of groups of magnet groups are arranged on the periphery of the mandrel along the circumferential direction of the mandrel, and the fastening sleeve is wound outside the plurality of groups of magnet groups along the circumferential direction of the motor rotor;
the magnet group comprises at least two permanent magnets which are arranged along the axial direction and are separated from each other, and in the magnet group, a boundary is formed between every two adjacent permanent magnets;
the method is characterized in that:
the boundary of at least one of the magnet groups and the boundary of another adjacent magnet group are respectively at different positions in the axial direction.
2. The electric machine rotor of claim 1, wherein:
the division in any two adjacent magnet groups is respectively at different positions in the axial direction.
3. The electric machine rotor of claim 1 or 2, characterized in that:
the magnet group comprises n permanent magnets, wherein n is more than or equal to 3;
at least n-1 adjacent magnet groups are respectively positioned at different positions in the axial direction at the boundaries.
4. The electric machine rotor of claim 1 or 2, characterized in that:
the magnet group comprises n permanent magnets;
on n adjacent magnet groups, each boundary is respectively located at different positions in the axial direction.
5. The electric machine rotor of claim 1 or 2, characterized in that:
in the magnet group, the length of one permanent magnet in the axial direction or the sum of the lengths of a plurality of permanent magnets in the axial direction is not equal to the length of the rest permanent magnet in the axial direction or the sum of the lengths of a plurality of permanent magnets in the axial direction.
6. The electric machine rotor of claim 5, wherein:
the lengths of any two permanent magnets in the axial direction are not equal.
7. The electric machine rotor of claim 1 or 2, characterized in that:
the motor rotor further comprises an axial retaining ring sleeved outside the mandrel, and the axial retaining ring axially limits the plurality of magnet groups.
8. The electric machine rotor of claim 1 or 2, characterized in that:
in the radial direction of the motor rotor, the permanent magnet is provided with an outer side surface and an inner side surface which are oppositely arranged;
the outer side face and the inner side face are both arc faces.
9. The electric machine rotor of claim 8, wherein:
the outer side faces are located on the same cylindrical surface.
10. The motor, including electric motor rotor, its characterized in that:
the motor rotor adopts the motor rotor of any one of the above claims 1 to 9.
11. Domestic appliance, including the motor, its characterized in that:
the motor is the motor of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011533055.0A CN112701820B (en) | 2020-12-21 | 2020-12-21 | Motor rotor, motor and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011533055.0A CN112701820B (en) | 2020-12-21 | 2020-12-21 | Motor rotor, motor and household appliance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112701820A true CN112701820A (en) | 2021-04-23 |
| CN112701820B CN112701820B (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011533055.0A Active CN112701820B (en) | 2020-12-21 | 2020-12-21 | Motor rotor, motor and household appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112701820B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824227A (en) * | 2021-08-25 | 2021-12-21 | 施宾德斯能源科技(苏州)有限公司 | Sheath structure of motor rotor and preparation method |
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| CN111697728A (en) * | 2020-07-08 | 2020-09-22 | 泉州台商投资区双霞机械设计服务中心 | Permanent magnet motor rotor |
| CN111884371A (en) * | 2020-07-21 | 2020-11-03 | 江苏汇智高端工程机械创新中心有限公司 | Permanent magnet motor rotor and permanent magnet motor |
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| JPH08322172A (en) * | 1995-05-29 | 1996-12-03 | Fanuc Ltd | Rotor for synchronous motor |
| US20030193265A1 (en) * | 2002-02-07 | 2003-10-16 | Wavecrest Laboratories, Llc | Rotary electric motor having at least three axially aligned stator poles and/or rotor poles |
| WO2013020846A2 (en) * | 2011-08-09 | 2013-02-14 | Siemens Aktiengesellschaft | Rotor for a permanent-magnet machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113824227A (en) * | 2021-08-25 | 2021-12-21 | 施宾德斯能源科技(苏州)有限公司 | Sheath structure of motor rotor and preparation method |
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| Publication number | Publication date |
|---|---|
| CN112701820B (en) | 2022-06-17 |
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