CN111106688A - Motor rotor and motor - Google Patents
Motor rotor and motor Download PDFInfo
- Publication number
- CN111106688A CN111106688A CN202010022498.7A CN202010022498A CN111106688A CN 111106688 A CN111106688 A CN 111106688A CN 202010022498 A CN202010022498 A CN 202010022498A CN 111106688 A CN111106688 A CN 111106688A
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- Prior art keywords
- mounting groove
- permanent magnet
- rotor
- slot
- motor
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
This electric motor rotor includes rotor core (1), be provided with first mounting groove (2) of perpendicular to motor d axle and be located two second mounting grooves (3) of first mounting groove (2) both sides on rotor core (1), be provided with first permanent magnet (4) in first mounting groove (2), be provided with second permanent magnet (5) in second mounting groove (3), two second mounting grooves (3) are about motor d axial symmetry, form contained angle α between first mounting groove (2) and second mounting groove (3), wherein 155 is no less than α is no less than 170.
Description
Technical Field
The application relates to the technical field of motors, in particular to a motor rotor and a motor.
Background
The high-speed permanent magnet synchronous motor has the advantages of high power density, good dynamic response, simple structure and the like, and becomes one of the research hotspots in the field of international motors. The strength of the rotor is used as a design core of a high-speed motor, and the design of a high-strength rotor structure under the same material becomes an important technology of the high-speed motor. For the built-in high-speed motor rotor, the maximum stress value generally appears at the reinforcing ribs of the high-speed motor rotor, so that the effect of improving the strength of the reinforcing ribs on the strength of the rotor is obvious.
In order to improve electric motor rotor's structural strength among the prior art, generally set up the magnet steel segmentation, and set up the strengthening rib between two adjacent segmentations, in addition, the magnet steel generally adopts U font or a style of calligraphy, when adopting U font magnet steel, the rotor core area that is located the U-shaped region is less, consequently takes place the magnetic saturation phenomenon easily, lead to this region to form the region of easily demagnetizing, influence motor operational reliability, when adopting a style of calligraphy, again lead to the volume of magnet steel limited, motor output torque reduces.
Disclosure of Invention
Therefore, the technical problem that this application will be solved lies in providing a motor rotor and motor, can effectively improve motor rotor's anti demagnetization performance, guarantees the output torque of motor simultaneously.
In order to solve the problem, the application provides an electric motor rotor, including rotor core, be provided with the first mounting groove of perpendicular to motor d axle and be located two second mounting grooves of first mounting groove both sides on the rotor core, be provided with first permanent magnet in the first mounting groove, be provided with the second permanent magnet in the second mounting groove, two second mounting grooves are symmetrical about motor d axle, first mounting groove and second mounting groove between form contained angle α near rotor excircle side, wherein 155 is less than or equal to α and is less than or equal to 170.
Preferably, the second mounting groove is spaced apart from the first mounting groove by a first magnetic isolation bridge.
Preferably, the first magnetic isolation bridge is of an equal-width structure.
Preferably, in a cross section perpendicular to the central axis of the rotor core, the first mounting groove is an isosceles trapezoid, and the first permanent magnet is an isosceles trapezoid matched with the first mounting groove in shape; along the radial outward direction, the width of isosceles trapezoid diminishes, and the extension line of two hypotenuses of isosceles trapezoid extends and intersects to the radial outside.
Preferably, in a cross section perpendicular to the central axis of the rotor core, the slot edge of the second mounting slot close to the first mounting slot is perpendicular to the radial inner side and the radial outer side of the second mounting slot, and the edge of the second permanent magnet is attached to the slot edge.
Preferably, one side of the second mounting groove far away from the first mounting groove is provided with a slot wedge hole, the second permanent magnet is a rectangular block, a slot wedge is arranged in the slot wedge hole, and the slot wedge is tightly clamped on the second permanent magnet.
Preferably, a second magnetic isolation bridge is formed between the slot-wedge hole and the outer circle of the rotor core.
Preferably, the included angle α is 165 °.
Preferably, in a cross section perpendicular to the central axis of the rotor core, the width of the first magnetic isolation bridge is 0.5mm to 3 mm; and/or the ratio of the length of the first permanent magnet to the length of the second permanent magnet is 1.2-1.6.
Preferably, the first permanent magnet occupies a circle center angle β of 30 ° to 35 °.
According to another aspect of the present application, there is provided an electric machine comprising an electric machine rotor as described above.
The utility model provides an electric motor rotor, including rotor core, be provided with the first mounting groove of perpendicular to motor d axle on the rotor core and be located two second mounting grooves of first mounting groove both sides, be provided with first permanent magnet in the first mounting groove, be provided with the second permanent magnet in the second mounting groove, two second mounting grooves are about motor d axisymmetric, form contained angle α near rotor excircle side between first mounting groove and the second mounting groove, wherein 155 is no less than α and no less than 170.
Drawings
Fig. 1 is a schematic structural view of a rotor of an electric machine according to a first embodiment of the present application;
fig. 2 is a schematic structural view of a rotor core of a rotor of an electric machine according to a first embodiment of the present application;
fig. 3 is a schematic structural view of a permanent magnet of a rotor of an electric machine according to a first embodiment of the present application;
fig. 4 is a schematic structural diagram of a rotor of a motor according to a second embodiment of the present application.
The reference numerals are represented as:
1. a rotor core; 2. a first mounting groove; 3. a second mounting groove; 4. a first permanent magnet; 5. a second permanent magnet; 6. a first magnetic isolation bridge; 7. a second magnetic isolation bridge; 8. a slot and wedge hole.
Detailed Description
Referring to fig. 1 to 4 in combination, according to an embodiment of the present application, a motor rotor includes a rotor core 1, a first mounting groove 2 perpendicular to a motor d axis and two second mounting grooves 3 located at two sides of the first mounting groove 2 are provided on the rotor core 1, a first permanent magnet 4 is provided in the first mounting groove 2, a second permanent magnet 5 is provided in the second mounting groove 3, the two second mounting grooves 3 are symmetrical with respect to the motor d axis, an included angle α is formed between the first mounting groove 2 and the second mounting groove 3 near an outer circumferential side of the rotor, wherein an included angle of 155 ° or more and α or less and 170 ° or less is preferably, the first mounting groove 2 is symmetrical with respect to the motor d axis.
Through the contained angle between the reasonable first mounting groove 2 of injecing and the second mounting groove 3 in this application, can make and have enough big flare angle between first mounting groove 2 and the second mounting groove 3, thereby make and have enough big distance between two second permanent magnets 5, form the rotor core region that relatively opens between the permanent magnet, effectively alleviate the easy saturated problem of magnetic density, improve motor operational reliability, can strengthen the quantity of permanent magnet simultaneously, improve motor output torque, guarantee the working property of motor.
By setting the angle α to the above-described angle range, a motor with low harmonic content and torque ripple can also be obtained, and therefore, motor operation noise can be reduced and motor performance can be improved.
The second installation groove 3 is separated from the first installation groove 2 by a first magnetic isolation bridge 6. Through set up first magnetism bridge 6 that separates between first mounting groove 2 and second mounting groove 3, can utilize first magnetism bridge 6 to strengthen the joint strength between the rotor core of the inside and outside both sides of mounting groove, improve electric motor rotor's overall structure intensity.
In this embodiment, the first magnetic isolation bridge 6 is of an equal-width structure, so that stress distribution of a connection structure formed by the first magnetic isolation bridge 6 is uniform, the strength of the rotor is improved, and the limit rotation speed of the motor can be further improved. Preferably, the corners of the first mounting groove 2 and the second mounting groove 3 are designed to be arc corners, so that the stress concentration of the rotor core at the first magnetic isolation bridge 6 can be effectively reduced, the punching strength is improved, and the structural strength of the motor is improved.
In the section of the central axis of the rotor core 1, the first mounting groove 2 is an isosceles trapezoid, and the first permanent magnet 4 is an isosceles trapezoid matched with the first mounting groove 2 in shape. In this embodiment, the width of the isosceles trapezoid decreases in the radially outward direction, and the extension lines of the two oblique sides of the isosceles trapezoid extend and intersect radially outward.
On the basis of adopting the first magnetism isolating bridge 6 with the same width, adopt the first mounting groove 2 of isosceles trapezoid, because the side that first magnetism isolating bridge 6 is close to isosceles trapezoid is parallel with the hypotenuse of isosceles trapezoid, therefore contained angle a1 between the hypotenuse of isosceles trapezoid and the radial outside topside has decided the angle that opens outward of second mounting groove 3, and then has decided the contained angle between second permanent magnet 5 and first permanent magnet 4, when two adjacent contained angles of side that second mounting groove 3 is close to first mounting groove 2 are the right angle, because first magnetism isolating bridge 6 is with the same width, therefore a1+ α +90 be 360, α be 270-a 1, a1 is bigger, α is smaller, a1 is smaller, then α is bigger.
After the first magnetism isolating bridge 6 with the same width and the first mounting groove 2 in the shape of an isosceles trapezoid are adopted, the structural strength of a motor rotor can be improved, the demagnetization resistance of the motor can be effectively improved, and the motor can reliably run in a high-speed state.
In the cross-section of the central axis of the perpendicular to rotor core 1, the width of the first magnetic isolation bridge 6 is 0.5 mm-3 mm, so that the first magnetic isolation bridge 6 can be ensured to have enough width, enough connection strength can be provided, centrifugal force can be effectively resisted, too large width of the first magnetic isolation bridge 6 can be avoided, large magnetic leakage is caused, and the working performance of the motor is improved.
In other embodiments, the second mounting groove 3 can also be designed as a trapezoidal groove and the first mounting groove 2 as a rectangular groove.
In the cross-section of the central axis of the perpendicular to rotor core 1, the second mounting groove 3 is close to the radial inner side and the radial outer side of the groove edge perpendicular to the second mounting groove 3 of the first mounting groove 2, the edge of the second permanent magnet 5 is attached to the groove edge, the non-groove wedge insertion of the permanent magnet can be realized, the assembly difficulty can be reduced, and the assembly efficiency can be improved.
In this embodiment, one side of the second mounting groove 3, which is far away from the first mounting groove 2, is provided with a slot wedge hole 8, the second permanent magnet 5 is a rectangular block, a slot wedge is arranged in the slot wedge hole 8, and the slot wedge tightly clamps the second permanent magnet 5.
Preferably, a second magnetic isolation bridge 7 is formed between the slot-wedge hole 8 and the outer circumference of the rotor core 1.
Set up slot wedge hole 8 in the one side of keeping away from first mounting groove 2 of second mounting groove 3, both can reduce slot wedge quantity, reduce the assembly degree of difficulty of permanent magnet, can utilize the slot wedge hole 8 that sets up in second mounting groove 3 and be close to rotor core 1's excircle one side to realize and rotor core 1's excircle between separate the magnetic bridge design, moreover, the steam generator is simple in structure, the design is nimble, also conveniently pack into the slot wedge from slot wedge hole 8 place side, and then utilize the slot wedge to compress tightly second permanent magnet 5 on the cell wall of second mounting groove 3, form effective fixity worker to second permanent magnet 5, second permanent magnet 5 removes when preventing the high-speed rotation of rotor, improve second permanent magnet 5 mounting structure's in second mounting groove 3 stability and reliability.
Preferably, the width of the second magnetic isolation bridge 7 is 0.5 mm-3 mm, which not only has enough thickness to resist the centrifugal force action of the first permanent magnet 4 and the second permanent magnet 5, but also can reduce the magnetic leakage between adjacent magnetic poles and improve the torque output.
Through designing first magnetism bridge 6 and second magnetism bridge 7, when the motor high-speed operation, the centrifugal force of first permanent magnet 4 and second permanent magnet 5 to the periphery of rotor core 1 is evenly undertaken by first magnetism bridge 6 and second magnetism bridge 7 for stress that first magnetism bridge 6 and second magnetism bridge 7 received is equallyd divide, has apparent effect to improving rotor intensity.
The first permanent magnet 4 and the second permanent magnet 5 can be bonded permanent magnets or sintered magnets such as neodymium iron boron, samarium cobalt and ferrite.
In a cross section perpendicular to the central axis of the rotor core 1, the distance between the magnetizing directions of the first permanent magnet 4 and the second permanent magnet 5 is perpendicular to the long side direction of the permanent magnets.
The ratio of the length of the first permanent magnet 4 to the length of the second permanent magnet 5 is 1.2-1.6, so that the length of the first permanent magnet 4 is greater than that of the second permanent magnet 5, and the structural strength of the motor rotor is further improved. By adopting the scheme, the first magnetism isolating bridge 6 and the second magnetism isolating bridge 7 can bear the stress of each pole together and are equal. When the number of the first magnetic isolation bridges 6 is the same and the lengths of the first permanent magnets 4 and the second permanent magnets 5 are fixed, in a certain range, the larger the first permanent magnet 4 is designed, the larger the stress borne by the first magnetic isolation bridges 6 is, and the stress borne by the second magnetic isolation bridges 7 can be reduced. Preferably, the ratio is 1.5.
The circle center angle β that first permanent magnet 4 occupy is 30 ~ 35, and this angle has decided first permanent magnet 4's length, prescribes a limit to first permanent magnet 4 in this within range, can make rotor core 1's structural strength the biggest, further improves rotor core's overall structure intensity.
According to an embodiment of the application, the electric machine comprises an electric machine rotor, which is the electric machine rotor described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not 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 is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several 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 (11)
1. The utility model provides an electric motor rotor, its characterized in that, includes rotor core (1), be provided with first mounting groove (2) of perpendicular to motor d axle and be located on rotor core (1) two second mounting groove (3) of first mounting groove (2) both sides, be provided with first permanent magnet (4) in first mounting groove (2), be provided with second permanent magnet (5) in second mounting groove (3), two second mounting groove (3) are about motor d axial symmetry, first mounting groove (2) with be close to rotor excircle side formation contained angle α between second mounting groove (3), wherein 155 is no less than α no less than 170.
2. An electric machine rotor according to claim 1, characterized in that the second mounting groove (3) is spaced apart from the first mounting groove (2) by a first magnetic-isolation bridge (6).
3. An electric machine rotor, according to claim 2, characterised in that said first magnetic bridges (6) are of uniform width construction.
4. An electric machine rotor according to any of claims 1-3, characterized in that in a cross-section perpendicular to the central axis of the rotor core (1), the first mounting slot (2) is isosceles trapezoid, the first permanent magnet (4) is isosceles trapezoid matching the shape of the first mounting slot (2); along the radial outward direction, the width of isosceles trapezoid diminishes, and the extension line of two hypotenuses of isosceles trapezoid extends and intersects to the radial outside.
5. An electric machine rotor according to claim 2, characterized in that in a cross-section perpendicular to the centre axis of the rotor core (1), the slot edge of the second mounting slot (3) close to the first mounting slot (2) is perpendicular to the radially inner and outer edges of the second mounting slot (3), and the edge of the second permanent magnet (5) abuts against the slot edge.
6. The electric motor rotor as recited in claim 5, characterized in that a slot wedge hole (8) is provided on the side of the second mounting groove (3) far away from the first mounting groove (2), the second permanent magnet (5) is a rectangular block, a slot wedge is provided in the slot wedge hole (8), and the slot wedge clamps the second permanent magnet (5).
7. An electric machine rotor according to claim 6, characterized in that a second magnetic isolation bridge (7) is formed between the slot-wedge hole (8) and the outer circle of the rotor core (1).
8. An electric machine rotor as claimed in claim 1, wherein said included angle α is 165 °.
9. An electric machine rotor according to claim 2, characterized in that the width of the first flux-isolating bridge (6) is 0.5-3 mm in a cross-section perpendicular to the central axis of the rotor core (1); and/or the ratio of the length of the first permanent magnet (4) to the length of the second permanent magnet (5) is 1.2-1.6.
10. An electric machine rotor, according to claim 1, characterised in that the centre angle β occupied by the first permanent magnet (4) is 30-35 °.
11. An electric machine comprising a machine rotor, characterized in that the machine rotor is a machine rotor according to any one of claims 1-10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022498.7A CN111106688A (en) | 2020-01-09 | 2020-01-09 | Motor rotor and motor |
| PCT/CN2020/120597 WO2021139290A1 (en) | 2020-01-09 | 2020-10-13 | Motor rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022498.7A CN111106688A (en) | 2020-01-09 | 2020-01-09 | Motor rotor and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111106688A true CN111106688A (en) | 2020-05-05 |
Family
ID=70427253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010022498.7A Pending CN111106688A (en) | 2020-01-09 | 2020-01-09 | Motor rotor and motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111106688A (en) |
| WO (1) | WO2021139290A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021139290A1 (en) * | 2020-01-09 | 2021-07-15 | 珠海格力电器股份有限公司 | Motor rotor and motor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004017507A1 (en) * | 2004-04-08 | 2005-10-27 | Minebea Co., Ltd. | Rotor arrangement for an electric machine |
| CN104882981B (en) * | 2015-06-15 | 2017-11-07 | 上海电机系统节能工程技术研究中心有限公司 | A kind of rotor punching structure of permanent-magnet servo motor |
| CN205336003U (en) * | 2016-02-01 | 2016-06-22 | 哈尔滨理工大学 | Permanent magnet generator with novel permanent magnet rotor magnetic circuit |
| US10211690B2 (en) * | 2016-04-28 | 2019-02-19 | Faraday & Future Inc. | IPM machine with specialized rotor for automotive electric vehicles |
| CN206650517U (en) * | 2017-03-10 | 2017-11-17 | 牟特科技（北京）有限公司 | A kind of motor rotor punching sheet and motor |
| CN109149820A (en) * | 2018-11-07 | 2019-01-04 | 珠海格力电器股份有限公司 | Magneto and rotor |
| CN111106688A (en) * | 2020-01-09 | 2020-05-05 | 珠海格力电器股份有限公司 | Motor rotor and motor |
-
2020
- 2020-01-09 CN CN202010022498.7A patent/CN111106688A/en active Pending
- 2020-10-13 WO PCT/CN2020/120597 patent/WO2021139290A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021139290A1 (en) * | 2020-01-09 | 2021-07-15 | 珠海格力电器股份有限公司 | Motor rotor and motor |
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| Publication number | Publication date |
|---|---|
| WO2021139290A1 (en) | 2021-07-15 |
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