阅读说明：本技术 转子冲片、电机的转子、电机和车辆 (Rotor punching sheet, rotor of motor, motor and vehicle ) 是由 陈佳慧 于 2020-04-02 设计创作，主要内容包括：本发明公开了一种转子冲片、电机的转子、电机和车辆,转子冲片设有多个槽组,槽组包括永磁体安装槽和两个第一气隙槽,在转子冲片的周向上,两个第一气隙槽分别设于永磁体安装槽的两侧且与永磁体安装槽连通,槽组具有沿转子冲片的径向延伸、且经过永磁体安装槽的外槽壁的中点的基线,第一气隙槽具有与永磁体安装槽的外槽壁相连的第一侧槽壁,第一侧槽壁向远离基线的方向且向外倾斜延伸,基线的垂线与第一侧槽壁的夹角为α,0°＜α≤75°。根据本发明实施例的转子冲片的最大应力点发生偏移,且最大应力值得以显著降低,从而使永磁体安装槽的外槽壁处应力显著降低,转子冲片不易断裂,且在满足机械强度要求的同时,能够选择磁性能更佳的硅钢片。(The invention discloses a rotor punching sheet, a rotor of the motor, the motor and a vehicle, wherein the rotor punching sheet is provided with a plurality of groove groups, each groove group comprises a permanent magnet installation groove and two first air gap grooves, the two first air gap grooves are respectively arranged on two sides of the permanent magnet installation groove and are communicated with the permanent magnet installation groove in the circumferential direction of the rotor punching sheet, each groove group is provided with a base line which extends along the radial direction of the rotor punching sheet and passes through the middle point of the outer groove wall of the permanent magnet installation groove, each first air gap groove is provided with a first side groove wall connected with the outer groove wall of the permanent magnet installation groove, the first side groove wall extends outwards in a direction far away from the base line, the included angle between the perpendicular line of the base line and the first side groove wall is alpha, and alpha is more than 0 degree and less than or equal to 75 degrees. According to the embodiment of the invention, the maximum stress point of the rotor punching sheet is deviated, and the maximum stress value is obviously reduced, so that the stress at the outer groove wall of the permanent magnet mounting groove is obviously reduced, the rotor punching sheet is not easy to break, and a silicon steel sheet with better magnetic property can be selected while the requirement on mechanical strength is met.)

1. A rotor punching sheet is characterized in that the rotor punching sheet is provided with a plurality of groove groups distributed along the circumferential direction of the rotor punching sheet, each groove group comprises a permanent magnet installation groove and two first air gap grooves, the two first air gap grooves are respectively arranged on two sides of the permanent magnet installation groove and are communicated with the permanent magnet installation groove in the circumferential direction of the rotor punching sheet,

the bank of cells has the edge the radially extended baseline of rotor punching, the baseline passes through the midpoint of the outer cell wall of permanent magnet mounting groove, first air gap groove have with the first side cell wall that the outer cell wall of permanent magnet mounting groove links to each other, first side cell wall is to keeping away from the direction of baseline and the extension that leans out, the plumb line of baseline with the contained angle of first side cell wall is alpha, alpha satisfies: alpha is more than 0 degree and less than or equal to 75 degrees.

2. The rotor sheet as recited in claim 1, wherein α satisfies: alpha is more than or equal to 10 degrees and less than or equal to 45 degrees.

3. The rotor sheet as recited in claim 1, wherein the two first air gap slots are spaced apart from each other by a distance W in a direction perpendicular to the base line₂₂The width of the permanent magnet mounting groove is W, wherein,

4. the rotor sheet as recited in claim 1, wherein the first side slot walls of the two first air gap slots are spaced proximally from each other by a distance W in a direction perpendicular to the base line₂₁The width of the permanent magnet mounting groove is W, wherein W₂₁≤W。

5. The rotor sheet as recited in claim 1, wherein the first air gap slot has a third side slot wall, the first side slot wall connecting the third side slot wall and an outer slot wall of the permanent magnet mounting slot, the third side slot wall having a length L₂₁The length of the first side groove wall is L₂₂The included angle between the first side groove wall and the third side groove wall is alpha₂₁Wherein, in the step (A),

6. the rotor sheet as recited in claim 1, wherein the first air gap slot has a second side slot wall opposite the first side slot wall, the second side slot wall extending obliquely outwardly away from the base line.

7. The rotor sheet as recited in claim 6, wherein the first air gap slot further has a bottom slot wall, the bottom slot wall of the first air gap slot being connected to the second side slot wall, the bottom slot wall of the first air gap slot being parallel to the base line.

8. The rotor sheet according to any one of claims 1 to 7, wherein a second air gap slot is provided at an outer side of the permanent magnet mounting slot, the second air gap slot is communicated with the permanent magnet mounting slot, and an inner notch of the second air gap slot is formed at an outer slot wall of the permanent magnet mounting slot.

9. The rotor sheet as recited in claim 8, wherein a spacing of two side slot walls of the second air gap slot opposite to each other decreases inwardly along the baseline.

10. The rotor sheet according to claim 9, wherein an included angle between a side groove wall of the second air gap groove and an outer groove wall of the permanent magnet mounting groove is α₁₁Said α and said α₁₁Satisfies the following conditions:

11. the rotor sheet as recited in claim 8, wherein the inner slot opening of the second air gap slot has a dimension W in a direction perpendicular to the baseline₁₂The size of the bottom groove wall of the second air gap groove is W₁₁The width of the permanent magnet mounting groove is W, wherein,

12. the rotor sheet as recited in claim 8, wherein the inner slot opening of the second air gap slot has a dimension W in a direction perpendicular to the baseline₁₂The first side groove walls of the two first air gap grooves are at a distance W from each other₂₁Wherein, in the step (A),

13. the rotor sheet as recited in claim 12, wherein W is the width of the slot₂₁And said W₁₂Satisfies the following conditions:

14. the rotor sheet as recited in claim 1, wherein the permanent magnet mounting slots are symmetrical about the baseline, and/or wherein the two first air gap slots are symmetrical about the baseline.

15. A rotor for an electric machine, comprising:

a rotor core formed by stacking a plurality of rotor sheets according to any one of claims 1 to 14 in an axial direction thereof;

and the permanent magnets are arranged in the permanent magnet mounting grooves of the plurality of rotor punching sheets.

16. An electrical machine comprising a rotor of an electrical machine according to claim 15.

17. A vehicle characterized by comprising an electric machine according to claim 16.

Technical Field

The invention relates to the technical field of vehicles, in particular to a rotor punching sheet, a rotor of a motor, the motor and a vehicle.

Background

In the correlation technique, the rotor is equipped with the permanent magnet mounting groove that is used for installing the permanent magnet, and the structure of permanent magnet mounting groove leads to stress concentration, leads to rotor sheet easy fracture, for example easily makes magnetic isolation bridge fracture inefficacy, consequently, often will separate magnetic bridge's width design great for guaranteeing mechanical strength, leads to the magnetic leakage serious, and often need select the silicon steel sheet that intensity is high, magnetic property is not good to be used for processing rotor sheet.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a rotor sheet, which is not easily broken.

Another object of the present invention is to provide a rotor of an electric machine having the above rotor sheet.

Another object of the invention is to propose an electric machine with a rotor as described above.

Another object of the invention is to propose a vehicle having an electric machine as described above.

According to the rotor punching sheet provided by the embodiment of the invention, the rotor punching sheet is provided with a plurality of groove groups distributed along the circumferential direction of the rotor punching sheet, each groove group comprises a permanent magnet installation groove and two first air gap grooves, the two first air gap grooves are respectively arranged at two sides of the permanent magnet installation groove and are communicated with the permanent magnet installation groove in the circumferential direction of the rotor punching sheet, each groove group is provided with a base line extending along the radial direction of the rotor punching sheet, the base line passes through the middle point of the outer groove wall of the permanent magnet installation groove, each first air gap groove is provided with a first side groove wall connected with the outer groove wall of the permanent magnet installation groove, the first side groove wall extends outwards in a direction far away from the base line, the included angle between the perpendicular line of the base line and the first side groove wall is alpha, and the alpha meets the following requirements: alpha is more than 0 degree and less than or equal to 75 degrees.

According to the rotor punching sheet provided by the embodiment of the invention, the first air gap groove 20 is arranged, alpha is more than 0 degree and less than or equal to 75 degrees, the maximum stress point of the rotor punching sheet is deviated, and the maximum stress value is obviously reduced, so that the stress at the outer groove wall of the permanent magnet mounting groove is obviously reduced, the rotor punching sheet is not easy to break, the service life is prolonged, and the silicon steel sheet with better magnetic property can be selected while the requirement on mechanical strength is met, thereby being beneficial to improving the magnetic property of the rotor punching sheet.

In addition, the rotor sheet according to the above embodiment of the present invention may further have the following additional technical features:

according to the rotor punching sheet of the embodiment of the invention, the alpha satisfies the following conditions: alpha is more than or equal to 10 degrees and less than or equal to 45 degrees.

According to some embodiments of the invention, the two first air gap slots have a distance W from each other in a direction perpendicular to the base line₂₂The width of the permanent magnet mounting groove is W, wherein,

according to some embodiments of the invention, the first side slot walls of the two first air gap slots are spaced proximally from each other in a direction perpendicular to the base line by a distance W₂₁The width of the permanent magnet mounting groove is W, wherein W₂₁≤W。

According to some embodiments of the invention, the first air slot has a third side slot wall, the first side slot wall connecting the third side slot wall and an outer slot wall of the permanent magnet mounting slot, the third side slot wall having a length L₂₁The length of the first side groove wall is L₂₂The included angle between the first side groove wall and the third side groove wall is alpha₂₁Wherein, in the step (A),

according to some embodiments of the invention, the first air gap slot has a second side slot wall opposite the first side slot wall, the second side slot wall extending obliquely outwardly and away from the base line.

According to some embodiments of the invention, the first air gap slot further has a bottom slot wall, the bottom slot wall of the first air gap slot being connected to the second side slot wall, the bottom slot wall of the first air gap slot being parallel to the base line.

According to some embodiments of the present invention, the permanent magnet mounting groove is provided at an outer side thereof with a second air gap groove communicating with the permanent magnet mounting groove, and an inner notch of the second air gap groove is formed at an outer groove wall of the permanent magnet mounting groove.

According to some embodiments of the invention, the spacing of the two opposing side slot walls of the second air gap slot decreases inwardly along the baseline.

According to some embodiments of the invention, an angle between a side slot wall of the second air gap slot and an outer slot wall of the permanent magnet mounting slot is α₁₁Said α and said α₁₁Satisfies the following conditions:

according to some embodiments of the invention, the inner slot opening of the second air gap slot has a dimension W in a direction perpendicular to the base line₁₂The size of the bottom groove wall of the second air gap groove is W₁₁The width of the permanent magnet mounting groove is W, wherein,

according to some embodiments of the invention, the inner slot opening of the second air gap slot has a dimension W in a direction perpendicular to the base line₁₂The first side groove walls of the two first air gap grooves are at a distance W from each other₂₁Wherein, in the step (A),

according to some embodiments of the invention, said W₂₁And said W₁₂Satisfies the following conditions:

according to some embodiments of the invention, the permanent magnet mounting slot is symmetrical about the base line, and/or the two first air gap slots are symmetrical about the base line.

A rotor of a motor according to an embodiment of the present invention includes: the rotor core is formed by stacking a plurality of rotor punching sheets according to the embodiment of the invention along the axial direction of the rotor core; and the permanent magnets are arranged in the permanent magnet mounting grooves of the plurality of rotor punching sheets.

A motor according to an embodiment of the present invention includes a rotor of a motor according to an embodiment of the present invention.

A vehicle according to an embodiment of the invention includes a motor according to an embodiment of the invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at block A;

FIG. 3 is a stress distribution diagram for a rotor without a first air gap slot;

FIG. 4 is a stress distribution diagram of a rotor according to an embodiment of the present invention.

Reference numerals:

a rotor sheet 100;

a permanent magnet mounting groove 10; an outer slot wall 11 of the permanent magnet mounting slot 10; a side slot wall 12 of the permanent magnet mounting slot 10;

a first air gap slot 20; a first side groove wall 21; a second sidewall wall 22; a bottom slot wall 23 of the first air slot 20; a third side pocket wall 24;

a magnetic isolation bridge 30;

a second air gap groove 40; the side slot wall 41 of the second air gap slot 40; a bottom slot wall 42 of the second air gap slot 40; a chamfered surface 43.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

A rotor punching sheet 100, a rotor of an electric machine, and a vehicle according to an embodiment of the present invention are described below with reference to the drawings.

In the design process of the rotor topological structure of the permanent magnet motor, leakage flux of a certain degree is bound to exist, and the utilization rate of the permanent magnet is reduced. In order to effectively control magnetic leakage, a magnetic isolation bridge structure is adopted as a common technical means. The magnetic flux leakage is effectively limited by the magnetic flux saturation in the magnetic isolation bridge. In view of reducing the leakage flux, the smaller the width of the magnetic isolation bridge, the smaller the leakage flux, but the same also leads to a reduction in the mechanical strength of the rotor.

At present, a permanent magnet synchronous motor, especially a new energy automobile driving motor, often runs under a high rotating speed working condition, particularly in a spoke type (spoke) topological structure, a magnetic isolation bridge is formed outside a permanent magnet mounting groove, stress concentration is caused at corners and corner accessories of the outer groove wall of the permanent magnet mounting groove, the magnetic isolation bridge can bear large centrifugal force influence, and if the mechanical strength of the magnetic isolation bridge is insufficient, the magnetic isolation bridge can break and fail. In some correlation technique, often will separate the width design of magnetic bridge great for guaranteeing mechanical strength, lead to the rotor magnetic leakage serious, perhaps choose the higher silicon steel sheet of intensity for use, be difficult to compromise the intensity and the magnetic performance demand of silicon steel sheet, be unfavorable for the promotion of magnetic performance.

Therefore, the present invention provides a rotor sheet 100 with reduced sheet stress concentration, in which the rotor sheet 100 is not easily broken, and even if the width of the magnetic isolation bridge is small, the magnetic isolation bridge is not easily broken and fails.

Referring to fig. 1 and 2, a plurality of groove groups are arranged on a rotor punching sheet 100 according to an embodiment of the present invention, and the groove groups are distributed along a circumferential direction of the rotor punching sheet 100. Each slot group comprises a permanent magnet mounting slot 10 and two first air gap slots 20. In the circumferential direction of the rotor sheet 100, two first air gap slots 20 are respectively disposed on two sides of the permanent magnet mounting groove 10 and are communicated with the permanent magnet mounting groove 10. The permanent magnets may be installed in the permanent magnet installation slots 10.

In addition, as shown in fig. 2, the slot group has a baseline (e.g., a dotted line shown in fig. 2) extending in a radial direction of the rotor sheet 100, the baseline passing through a midpoint of an outer slot wall of the permanent magnet mounting slot 10. The first air gap groove 20 has a first side groove wall 21, and the first side groove wall 21 is connected to the outer groove wall 11 of the permanent magnet installation groove 10, in other words, two first air gap grooves 20 are respectively disposed at two corners of the outer end of the permanent magnet installation groove 10, so that the outer end of the permanent magnet installation groove 10 does not have a corner structure with a smaller angle in the related art.

In the present invention, "outer" refers to a direction away from the center point of the rotor sheet 100 along the radial direction of the rotor sheet 100, and "inner" refers to a direction close to the center point of the rotor sheet 100 along the radial direction of the rotor sheet 100. For example, the "outer slot wall 11 of the permanent magnet mounting slot 10" refers to one of the slot walls of the permanent magnet mounting slot 10 that is far from the center point of the rotor punching sheet 100.

In addition, it should be noted that in some embodiments of the present invention, the base line may be a symmetry line of the slot group, that is, the permanent magnet installation slot 10 is symmetrical about the base line, and the two first air gap slots 20 are also symmetrical about the base line; in other embodiments, the permanent magnet installation slot 10 may not be symmetrical with respect to the baseline, for example, the permanent magnet installation slot 10 may be a tile-shaped slot, where the baseline is a connection line between a midpoint of an outer slot wall and a midpoint of an inner slot wall of the tile-shaped slot; in still other embodiments, the two first air gap slots 20 may not be symmetrical about the baseline, that is, in embodiments of the present invention, the two first air gap slots 20 may or may not be identical in structure, all within the scope of the present invention.

In some embodiments, as shown in fig. 2, the first side slot wall 21 extends obliquely outward in a direction away from the base line, so that the extending direction of the first side slot wall 21 is different from the extending direction of the outer slot wall 11 and the side slot wall 12 of the permanent magnet installation slot 10, and the included angle between the first side slot wall 21 and the outer slot wall 11 of the permanent magnet installation slot 10 is an obtuse angle, thereby reducing stress concentration at the connection position of the first air gap slot 20 and the permanent magnet installation slot 10 and improving mechanical strength.

Referring to fig. 2, an included angle between the first side groove wall 21 and a perpendicular line of the base line is α, and α satisfies: alpha is more than 0 degree and less than or equal to 75 degrees. In the above angular range, the maximum stress point of the rotor sheet 100 is located on the slot wall of the first air gap slot 20, and the maximum stress value is effectively reduced, while the stress value of the position of the permanent magnet mounting slot 10 in contact with the permanent magnet (i.e., the outer slot wall 11 of the permanent magnet mounting slot 10) is significantly reduced, so that the rotor sheet 100 is not easily broken even when the rotor sheet is operated at a high speed. Moreover, for the silicon steel sheets used for processing the rotor sheet 100, the silicon steel sheets with different specifications are difficult to simultaneously consider high strength and good magnetic performance, and in the embodiment of the present invention, the specification with better magnetic performance can be selected for the silicon steel sheets within the angle range and on the premise of satisfying the mechanical strength, so as to improve the high-speed performance of the rotor sheet 100.

For example, fig. 3 shows a stress distribution pattern of a rotor without the first air gap groove 20, that is, a stress distribution pattern of a rotor having a corner structure at an outer end of a permanent magnet installation groove, and fig. 4 shows a stress distribution pattern of a rotor provided with a permanent magnet installation groove 10 and a first air gap groove 20 according to the present invention. The beneficial effects described above are also well documented by the stress profiles of fig. 3 and 4.

For example, in some particular embodiments, α is 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, and so forth. In some embodiments, α satisfies: alpha is more than or equal to 10 degrees and less than or equal to 45 degrees, the maximum stress value is smaller in the angle range, the stress at the outer groove wall 11 of the permanent magnet installation groove 10 is smaller, and the groove group is easier to machine.

It should be noted that, in the example shown in fig. 1 and fig. 2, the permanent magnet installation slot 10 is a rectangular slot extending along the radial direction of the rotor sheet 100 for illustrative purposes, and in other embodiments, the outer slot wall 11 of the permanent magnet installation slot 10 may be a plane or an arc surface, and the side slot wall 12 of the permanent magnet installation slot 10 may also be a plane or an arc surface, which are within the protection scope of the present invention.

According to the rotor punching sheet 100 provided by the embodiment of the invention, the first air gap groove 20 is arranged, alpha is more than 0 degree and less than or equal to 75 degrees, so that the maximum stress point of the rotor punching sheet 100 is deviated, and the maximum stress value is obviously reduced, the stress at the outer groove wall 11 of the permanent magnet installation groove 10 is obviously reduced, the rotor punching sheet 100 is not easy to break, the service life is prolonged, and a silicon steel sheet with better magnetic property can be selected while the requirement on mechanical strength is met, thereby being beneficial to improving the magnetic property of the rotor punching sheet 100.

According to some embodiments of the present invention, as shown in FIG. 2, the two first air gap slots 20 are spaced apart from each other by a distance W in a direction perpendicular to the base line (e.g., tangential to the rotor sheet 100 shown in FIG. 2)₂₂The width of the permanent magnet installation groove 10 is W, wherein,for example, in some embodiments,and may be 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, etc. In the above ratio range, the extension size of the part of the rotor sheet 100 located outside the slot group in the circumferential direction of the rotor sheet 100 is larger, the stress distribution area on the rotor sheet 100 is expanded sufficiently to improve the uniformity of stress dispersion, the distance between the maximum stress point and the outer slot wall 11 of the permanent magnet mounting slot 10 is larger, and the position on the outer slot wall 11, which is in contact with the permanent magnet, is less prone to fracture; and the part of the rotor punching sheet 100, which is positioned outside the slot group, is prevented from being too large in length, so that the situation that stress concentration occurs in the first air gap slot 20 due to the fact that a corner with a small angle occurs in the first air gap slot 20 is prevented.

According to some embodiments of the invention, as shown in FIG. 2, in the vertical directionThe first side groove walls 21 of the two first air gap grooves 20 are arranged at a distance W from each other in the direction of the base line₂₁And W is₂₁Is less than or equal to the width W of the permanent magnet mounting groove 10, i.e. W₂₁W is less than or equal to W. After the permanent magnet is installed in the permanent magnet installation groove 10, two sharp corners of the outer end of the permanent magnet are located in the first air gap groove 20, namely, the two sharp corners are not in contact with the outer groove wall 11 of the permanent magnet installation groove 10 and the first side groove wall 21 of the first air gap groove 20, so that the two sharp corners of the permanent magnet can be prevented from being damaged due to large stress, and the structural stability of the permanent magnet can be improved.

In some embodiments, referring to FIG. 2, the first air slot 20 has a second side slot wall 22, the second side slot wall 22 and the first side slot wall 21 are opposite to each other, and the second side slot wall 22 extends obliquely outward and away from the base line.

By the arrangement of the structure, the extending direction of the second side groove wall 22 is different from the extending direction of the outer groove wall 11 and the side groove wall 12 of the permanent magnet mounting groove 10, and the included angle formed by the second side groove wall 22 and the side groove wall 12 of the permanent magnet mounting groove 10 is an obtuse angle, so that the stress concentration at the joint of the first air gap groove 20 and the side groove wall 12 of the permanent magnet mounting groove 10 can be reduced, and the mechanical strength is improved.

According to some embodiments of the present invention, as shown in fig. 2, the first air slot 20 further has a third side slot wall 24, the first side slot wall 21 connects the third side slot wall 24 and the outer slot wall 11 of the permanent magnet mounting slot 10, and the planes of the first side slot wall 21 and the third side slot wall 24 are not coplanar. Wherein the third side groove wall 24 has a length L in a radial cross section as shown in FIG. 2₂₁The length of the first side groove wall 21 is L₂₂The included angle between the first side groove wall 21 and the third side groove wall 24 is alpha₂₁Wherein, in the step (A),

therefore, the included angle between the third side groove wall 24 and the bottom groove wall 23 of the first air gap groove 20 can be increased, and the included angle between the first side groove wall 21 and the outer groove wall 11 of the permanent magnet installation groove 10 can be increased, so that the stress concentration at the two positions can be reduced, and the stress amplitude can be reduced.

In some embodiments, as shown in FIG. 2, the first air slot 20 also has a bottom slot wall 23, the bottom slot wall 23 of the first air slot 20 being connected to the second side slot wall 22. In embodiments with a third side slot wall 24, the bottom slot wall 23 connects the third side slot wall 24 and the second side slot wall 22, and in embodiments without the third side slot wall 24, the bottom slot wall 23 connects the first side slot wall 21 and the second side slot wall 22. Further, the bottom slot wall 23 of the first air gap slot 20 is parallel to the base line. Compared with the case that the first side groove wall 21 (or the third side groove wall 24) is directly connected with the second side groove wall 22, the included angle formed by the bottom groove wall 23 and the first side groove wall 21 (or the third side groove wall 24) and the included angle formed by the bottom groove wall 23 and the second side groove wall 22 are both larger than the included angle formed by the direct connection of the first side groove wall 21 (or the third side groove wall 24) and the second side groove wall 22 by arranging the bottom groove wall 23, and the stress concentration in the first air gap groove 20 is further reduced.

In some embodiments of the present invention, as shown in fig. 2, a second air gap groove 40 is provided on the outer side of the permanent magnet installation groove 10, the second air gap groove 40 is communicated with the permanent magnet installation groove 10, and an inner slot opening of the second air gap groove 40 (a slot opening of the second air gap groove 40 close to the center point of the rotor sheet 100) is formed on the outer slot wall 11 of the permanent magnet installation groove 10.

In some embodiments, the portion of the rotor sheet 100 located outside the second air gap groove 40 may be formed as the magnetic isolation bridge 30, and since the portion of the rotor sheet 100 located between the first air gap groove 40 and the second air gap groove 40 can provide stable support for the permanent magnet, the mechanical strength is ensured. Therefore, by arranging the second air gap groove 40, the width of the magnetic isolation bridge 30 can be set smaller, so that the magnetic leakage is effectively reduced, and the material utilization rate is improved. In other embodiments, on the premise of ensuring the mechanical strength, the second air gap groove 40 may further have an outer notch formed on the outer circumferential surface of the rotor sheet 100, so that the effect of reducing the magnetic flux leakage is better.

According to some embodiments of the present invention, as shown in fig. 2, the distance between two opposite side slot walls 41 of the second air gap slot 40 decreases inward along the length direction of the permanent magnet mounting slot 10 to increase the extension length of the magnetic isolation bridge 30 along the circumferential direction of the rotor sheet 100, so as to improve the effect of reducing magnetic leakage, and the portion of the rotor sheet 100 located between the side slot wall 41 of the second air gap slot 40 and the outer slot wall 11 of the permanent magnet mounting slot 10 may form a protruding structure with a larger size, and the protruding structure may form effective radial support for the permanent magnet, thereby improving stability.

According to some embodiments of the present invention, referring to FIG. 2, the side slot wall 41 of the second air-gap slot 40 and the outer slot wall 11 of the permanent magnet mounting slot 10 are angled at an angle α₁₁Alpha and alpha₁₁Satisfies the following conditions:in the case of a being constant, this ratio is too small, resulting in an included angle α₁₁If the angle of inclination of the side slot wall 41 of the second air gap slot 40 is too large, the extension dimension of the magnetic isolation bridge 30 along the circumferential direction of the rotor sheet 100 is too small, and the magnetic isolation effect is reduced. Too large of this ratio will result in an included angle α₁₁Too small, reduces the structural strength of the boss portion, and increases the difficulty of machining the second air gap groove 40.

Therefore, within the above size range, it is not only beneficial to increase the extension size of the magnetic isolation bridge 30 in the circumferential direction of the rotor sheet 100 to improve the magnetic isolation effect and reduce the magnetic leakage, but also beneficial to improve the mechanical strength of the convex part and make the convex part less prone to fracture. For example, in some embodiments, α/α₁₁And may be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. In some embodiments, α and α₁₁Satisfies the following conditions:

in an embodiment of the present invention, the junctions of the walls may be joined by chamfers, such as the rounded chamfers shown in fig. 2, to reduce stress concentrations at the junctions of the walls. For example, in fig. 2, the junctions between the first side slot wall 21 of the first air slot 20 and the outer slot wall 11 of the permanent magnet mounting slot 10, between the second side slot wall 22 of the first air slot 20 and the side slot wall 12 of the permanent magnet mounting slot 10, between the first side slot wall 21 and the third side slot wall 24 of the first air slot 20, between the third side slot wall 24 and the bottom slot wall 23 of the first air slot 20, between the second side slot wall 22 and the bottom slot wall 23 of the first air slot 20, between the outer slot wall 11 of the permanent magnet mounting slot 10 and the side slot wall 41 of the second air slot 40, and between the bottom slot wall 42 and the two side slot walls 41 of the second air slot 40 are all connected by a chamfer.

It should be noted that, in the description of the present invention, each parameter is based on the embodiment where no chamfer is provided. For example, as shown in FIG. 2, the opening dimension W of the inner slot opening of the second air gap slot 40 in the direction perpendicular to the base line₁₂The distance between the two side slot walls 41 of the second air gap slot 40 and the intersection point of the extension lines of the outer slot wall 11 of the permanent magnet mounting slot 10 is defined.

For another example, as shown in FIG. 2, the bottom slot wall 42 and the two side slot walls 41 of the second air gap slot 40 may be connected by a chamfered surface 43, the spacing of the two chamfered surfaces 43 increasing inwardly along the base line. Compared with the direct connection of the bottom slot wall 42 and the side slot wall 41 of the second air gap slot 40, the included angle formed by the chamfer surface 43 and the bottom slot wall 42 of the second air gap slot 40, the included angle formed by the chamfer surface 43 and the side slot wall 41 of the second air gap slot 40 are larger than the included angle formed by the direct connection of the bottom slot wall 42 and the side slot wall 41 of the second air gap slot 40, and the stress concentration in the second air gap slot 40 is reduced.

According to some embodiments of the present invention, as shown in FIG. 2, the inner slot opening of the second air gap slot 40 has a dimension W in a direction perpendicular to the base line₁₂The dimension W of the bottom slot wall 42 of the second air gap slot 40₁₁The width of the permanent magnet installation groove 10 is W, wherein,the outer slot wall 11 of the permanent magnet mounting slot 10 has enough area to provide stable support for the permanent magnet, and meanwhile, the inclination angle of the side slot wall 41 of the second air gap slot 40 is more suitable, so that the effect of improving the structural strength of the rotor sheet 100 is better. For example, in some embodiments,0.31, 0.4, 0.5, 0.6, etc.,1.15, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, etc.

In some embodiments of the present invention, and with continued reference to FIG. 2, the first side slot walls 21 of the two first air gap slots 20 are spaced proximally from one another in a direction perpendicular to the baseline by a distance W₂₁Wherein, in the step (A),within the above ratio range, the contact area between the outer slot wall 11 of the permanent magnet mounting slot 10 and the permanent magnet is large enough to ensure the stability of the permanent magnet fixation, and at the same time, the stress concentration is reduced, and the processing of the second air gap slot 40 is facilitated. In some embodiments of the present invention, the,the fixed permanent magnet has better stability effect and is easier to process. In some embodiments of the present invention, the substrate may be,and may be 0.3, 0.4, 0.5, 0.6, 0.7, etc.

In addition, in the invention, the inner wall surfaces of the first air gap groove 20 and the second air gap groove 40 do not form an integral curved surface, so that parameterization is easy to realize, on one hand, specific structural parameters can be conveniently and accurately expressed when the design process is shifted to the machining process, and on the other hand, detection is easy after machining is finished, thereby being beneficial to improving the yield of the production of the rotor sheet 100.

The rotor of the motor according to the embodiment of the present invention includes a rotor core formed by stacking a plurality of rotor sheets 100 according to the embodiment of the present invention in an axial direction thereof, and permanent magnets installed in permanent magnet installation grooves 10 of the plurality of rotor sheets. Because the rotor sheet 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, according to the rotor of the motor according to the embodiment of the present invention, by providing the first air gap groove 20, where α is greater than 0 ° and less than or equal to 75 °, the maximum stress point of the rotor sheet 100 is shifted, and the maximum stress value is significantly reduced, so that the stress at the outer groove wall 11 of the permanent magnet mounting groove 10 is significantly reduced, the rotor sheet 100 is not easily broken, the service life is prolonged, and while the requirement of mechanical strength is met, a silicon steel sheet with better magnetic performance can be selected, which is beneficial to improving the magnetic performance of the rotor sheet 100.

A motor according to an embodiment of the present invention includes a rotor of a motor according to an embodiment of the present invention. Because the rotor of the motor has the beneficial technical effects, according to the motor provided by the embodiment of the invention, the maximum stress point of the rotor sheet 100 is deviated and the maximum stress value is remarkably reduced by arranging the first air gap groove 20 with alpha being more than 0 degree and less than or equal to 75 degrees, so that the stress at the outer groove wall 11 of the permanent magnet mounting groove 10 is remarkably reduced, the rotor sheet 100 is not easy to break, the service life is prolonged, and the silicon steel sheet with better magnetic property can be selected while the requirement on mechanical strength is met, thereby being beneficial to improving the magnetic property of the rotor sheet 100.

A vehicle according to an embodiment of the invention includes a motor according to an embodiment of the invention. Because the motor has the beneficial technical effects, according to the vehicle provided by the embodiment of the invention, the maximum stress point of the rotor sheet 100 is shifted and the maximum stress value is remarkably reduced by arranging the first air gap groove 20 with alpha being more than 0 degree and less than or equal to 75 degrees, so that the stress at the outer groove wall 11 of the permanent magnet mounting groove 10 is remarkably reduced, the rotor sheet 100 is not easy to break, the service life is prolonged, and the silicon steel sheet with better magnetic property can be selected while the requirement on mechanical strength is met, thereby being beneficial to improving the magnetic property of the rotor sheet 100.

Other constructions and operations of the motor, rotor and vehicle according to embodiments of the invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.