阅读说明：本技术 转子组件及永磁电机 (Rotor assembly and permanent magnet motor ) 是由 魏正平 李权锋 杨爱洁 王周叶 汪汉新 陈建 于 2019-11-18 设计创作，主要内容包括：本发明提供了一种转子组件及永磁电机,在转子组件中设置有转子；安装腔,设置在转子内,安装腔中具有两个安装槽,两个安装槽之间具有夹角,安装槽用于安装永磁体,安装槽的两端分别为近端和远端,安装槽的远端与转子的中心线之间的距离大于安装槽的近端与转子的中心线之间的距离；空气槽组,设置在转子内,空气槽组位于安装腔的两个安装槽与转子的外壁围绕成的区域内,空气槽组包括间隔设置的第一空气槽、第二空气槽和第三空气槽。通过在安装腔的两个安装槽与转子的外壁围绕成的区域内间隔设置第一空气槽、第二空气槽和第三空气槽,可降低电机的激振力,优化电机的磁通密度,降低转矩脉动,从而降低电机的振动和噪音。(The invention provides a rotor assembly and a permanent magnet motor, wherein a rotor is arranged in the rotor assembly; the mounting cavity is arranged in the rotor, two mounting grooves are formed in the mounting cavity, an included angle is formed between the two mounting grooves, the mounting grooves are used for mounting permanent magnets, the two ends of each mounting groove are respectively a near end and a far end, and the distance between the far ends of the mounting grooves and the center line of the rotor is larger than the distance between the near ends of the mounting grooves and the center line of the rotor; and the air groove group is arranged in the rotor, is positioned in an area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor, and comprises a first air groove, a second air groove and a third air groove which are arranged at intervals. The first air groove, the second air groove and the third air groove are arranged in the area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor at intervals, so that the exciting force of the motor can be reduced, the magnetic flux density of the motor is optimized, the torque pulsation is reduced, and the vibration and the noise of the motor are reduced.)

1. A rotor assembly, comprising:

a rotor (10);

the mounting cavity is arranged in the rotor (10), two mounting grooves (20) are arranged in the mounting cavity, an included angle is formed between the two mounting grooves (20), the mounting grooves (20) are used for mounting permanent magnets (30), the two ends of each mounting groove (20) are respectively a near end and a far end, and the distance between the far end of each mounting groove (20) and the center line of the rotor (10) is greater than the distance between the near end of each mounting groove (20) and the center line of the rotor (10);

the air groove set is arranged in the rotor (10) and is positioned in an area enclosed by two mounting grooves (20) of the mounting cavity and the outer wall of the rotor (10), and the air groove set comprises a first air groove (41), a second air groove (42) and a third air groove (43) which are arranged at intervals.

2. The rotor assembly according to claim 1, characterized in that, on a plane perpendicular to the centerline of the rotor (10),

a connecting line between a point closest to the second mounting groove (20) and the midpoint of the rotor (10) on the far-end edge of the first mounting groove (20) in the mounting cavity is a first connecting line, a connecting line between a point closest to the first mounting groove (20) and the midpoint of the rotor (10) on the far-end edge of the second mounting groove (20) in the mounting cavity is a second connecting line, and an included angle between the second connecting line and the first connecting line is A0;

the first air groove (41) is an arc-shaped groove extending along the circumferential direction of the rotor (10), extension lines of two side edges of the first air groove (41) pass through the center of the rotor (10), and an included angle between the two side edges of the first air groove (41) is A1;

wherein A1/A0 is 0.15-0.25.

3. The rotor assembly of claim 2,

the second air groove (42) is an arc-shaped groove extending along the circumferential direction of the rotor (10), extension lines of two side edges of the second air groove (42) pass through the center of the rotor (10), and an included angle between the two side edges of the second air groove (42) is A2;

A2/A0＝0.04～0.08。

4. the rotor assembly of claim 2,

the third air groove (43) is an arc-shaped groove extending along the circumferential direction of the rotor (10), extension lines of two side edges of the third air groove (43) pass through the center of the rotor (10), and an included angle between the two side edges of the third air groove (43) is A3;

A3/A0＝0.07～0.13。

5. the rotor assembly according to claim 1, wherein the first air groove (41) is an arc-shaped groove extending in a circumferential direction of the rotor (10), a distance between the first air groove (41) and an outer wall of the rotor (10) in a radial direction of the rotor (10) is T0, a width of the first air groove (41) is T1; T1/T0 is 0.4-0.7.

6. The rotor assembly of claim 5, wherein the second air groove (42) is an arc-shaped groove extending along the circumferential direction of the rotor (10), and the width of the second air groove (42) in the radial direction of the rotor (10) is T2, and T2/T1 is 1-1.1.

7. The rotor assembly according to claim 5, wherein the third air groove (43) is an arc-shaped groove extending along the circumferential direction of the rotor (10), and the width of the third air groove (43) in the radial direction of the rotor (10) is T3, and T3/T1 is 1-1.1.

8. The rotor assembly of claim 1,

two of the mounting slots (20) in the mounting cavity are symmetrically arranged with respect to a preset plane passing through a center line of the rotor (10);

two air groove groups are arranged in the area enclosed by the two mounting grooves (20) of the mounting cavity and the outer wall of the rotor (10), and are symmetrically arranged relative to the preset plane.

9. The rotor assembly of claim 1, wherein the second air slot (42) is located on a side of the first air slot (41) away from a centerline of the rotor (10); the second air slot (42) is located on a side of the third air slot (43) away from the centerline of the rotor (10); the second air groove (42) is located between the first air groove (41) and the third air groove (43) in the circumferential direction of the rotor (10).

10. The rotor assembly of claim 1,

a first separation groove (21) is formed in the region between the inner wall of the far end of the mounting groove (20) and the permanent magnet (30) positioned in the mounting groove (20), and a second separation groove (22) is formed in the region between the inner wall of the near end of the mounting groove (20) and the permanent magnet (30) positioned in the mounting groove (20);

the installation cavity is a plurality of, a plurality of installation cavity along rotor (10) circumference distribution is in on rotor (10).

11. A rotor assembly as claimed in any one of claims 1 to 10, wherein the rotor (10) is formed by laminating a plurality of laminations, and a gap between two adjacent laminations is filled with paint.

12. A permanent magnet electrical machine comprising a rotor assembly according to any one of claims 1 to 11.

Technical Field

The invention relates to the technical field of motors, in particular to a rotor assembly and a permanent magnet motor.

Background

Disclosure of Invention

The invention provides a rotor assembly and a permanent magnet motor, which are used for reducing the excitation force of the motor.

In order to achieve the above object, according to one aspect of the present invention, there is provided a rotor assembly including: a rotor; the mounting cavity is arranged in the rotor, two mounting grooves are formed in the mounting cavity, an included angle is formed between the two mounting grooves, the mounting grooves are used for mounting permanent magnets, the two ends of each mounting groove are respectively a near end and a far end, and the distance between the far ends of the mounting grooves and the center line of the rotor is larger than the distance between the near ends of the mounting grooves and the center line of the rotor; and the air groove group is arranged in the rotor, is positioned in an area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor, and comprises a first air groove, a second air groove and a third air groove which are arranged at intervals.

Further, on a plane perpendicular to the center line of the rotor, a connecting line between a point closest to the second mounting groove and the midpoint of the rotor on the distal edge of the first mounting groove in the mounting cavity is a first connecting line, a connecting line between a point closest to the first mounting groove and the midpoint of the rotor on the distal edge of the second mounting groove in the mounting cavity is a second connecting line, and an included angle between the second connecting line and the first connecting line is a 0; the first air groove is an arc-shaped groove extending along the circumferential direction of the rotor, extension lines of two side edges of the first air groove pass through the center of the rotor, and an included angle between the two side edges of the first air groove is A1; wherein A1/A0 is 0.15-0.25.

Further, the second air groove is an arc-shaped groove extending along the circumferential direction of the rotor, extension lines of two side edges of the second air groove pass through the center of the rotor, and an included angle between the two side edges of the second air groove is A2; A2/A0 is 0.04-0.08.

Further, the third air groove is an arc-shaped groove extending along the circumferential direction of the rotor, extension lines of two side edges of the third air groove pass through the center of the rotor, and an included angle between the two side edges of the third air groove is A3; A3/A0 is 0.07-0.13.

Further, the first air groove is an arc-shaped groove extending along the circumferential direction of the rotor, the distance between the first air groove and the outer wall of the rotor in the radial direction of the rotor is T0, and the width of the first air groove is T1; T1/T0 is 0.4-0.7.

Further, the second air groove is an arc-shaped groove extending along the circumferential direction of the rotor, the width of the second air groove in the radial direction of the rotor is T2, and T2/T1 is 1-1.1.

Further, the third air groove is an arc-shaped groove extending along the circumferential direction of the rotor, and the width of the third air groove in the radial direction of the rotor is T3, and T3/T1 is 1-1.1.

Further, two of the mounting grooves in the mounting cavity are symmetrically arranged with respect to a preset plane passing through a center line of the rotor; two air groove groups are arranged in an area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor, and the two air groove groups are symmetrically arranged relative to the preset plane.

Further, the second air slot is located on one side of the first air slot away from the center line of the rotor; the second air slot is positioned on one side of the third air slot away from the center line of the rotor; the second air groove is located between the first air groove and the third air groove in a circumferential direction of the rotor.

Furthermore, a first separation groove is formed in the area between the inner wall of the far end of the mounting groove and the permanent magnet positioned in the mounting groove, and a second separation groove is formed in the area between the inner wall of the near end of the mounting groove and the permanent magnet positioned in the mounting groove; the installation cavity is a plurality of, and a plurality of installation cavity is along the circumference distribution of rotor is in on the rotor.

Furthermore, the rotor is formed by laminating a plurality of punching sheets, and paint is soaked in a gap between every two adjacent punching sheets.

According to another aspect of the present invention, there is provided a permanent magnet electric machine comprising a rotor assembly as provided above.

By applying the technical scheme of the invention, the invention provides the rotor assembly, wherein the rotor is arranged in the rotor assembly; the mounting cavity is arranged in the rotor, two mounting grooves are formed in the mounting cavity, an included angle is formed between the two mounting grooves, the mounting grooves are used for mounting permanent magnets, the two ends of each mounting groove are respectively a near end and a far end, and the distance between the far ends of the mounting grooves and the center line of the rotor is larger than the distance between the near ends of the mounting grooves and the center line of the rotor; and the air groove group is arranged in the rotor, is positioned in an area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor, and comprises a first air groove, a second air groove and a third air groove which are arranged at intervals. The first air groove, the second air groove and the third air groove are arranged in the area surrounded by the two mounting grooves of the mounting cavity and the outer wall of the rotor at intervals, so that the exciting force of the motor can be reduced, the magnetic flux density of the motor is optimized, the torque pulsation is reduced, and the vibration and the noise of the motor are reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 illustrates a schematic structural view of a rotor assembly provided by an embodiment of the present invention;

fig. 2 shows a partially enlarged view of a right structure of the rotor assembly of fig. 1;

fig. 3 shows a partially enlarged view of the top structure of the rotor assembly of fig. 1.

Wherein the figures include the following reference numerals:

10. a rotor; 20. mounting grooves; 21. a first partition groove; 22. a second partition groove; 30. a permanent magnet; 41. a first air tank; 42. a second air tank; 43. a third air tank; 50. a main shaft.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in the drawings, embodiments of the present invention provide a rotor assembly including: a rotor 10; the mounting cavity is arranged in the rotor 10, two mounting grooves 20 are formed in the mounting cavity, an included angle is formed between the two mounting grooves 20, the mounting grooves 20 are used for mounting permanent magnets 30, two ends of each mounting groove 20 are respectively a near end and a far end, and the distance between the far end of each mounting groove 20 and the center line of the rotor 10 is greater than the distance between the near end of each mounting groove 20 and the center line of the rotor 10; and the air groove group is arranged in the rotor 10 and is positioned in an area enclosed by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10, and the air groove group comprises a first air groove 41, a second air groove 42 and a third air groove 43 which are arranged at intervals.

By applying the technical scheme of the invention, the invention provides a rotor assembly, wherein a rotor 10 is arranged in the rotor assembly; the mounting cavity is arranged in the rotor 10, two mounting grooves 20 are formed in the mounting cavity, an included angle is formed between the two mounting grooves 20, the mounting grooves 20 are used for mounting permanent magnets 30, two ends of each mounting groove 20 are respectively a near end and a far end, and the distance between the far end of each mounting groove 20 and the center line of the rotor 10 is greater than the distance between the near end of each mounting groove 20 and the center line of the rotor 10; and the air groove group is arranged in the rotor and is positioned in an area enclosed by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10, and the air groove group comprises a first air groove 41, a second air groove 42 and a third air groove 43 which are arranged at intervals. The first air groove 41, the second air groove 42 and the third air groove 43 are arranged in the area surrounded by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10 at intervals, so that the excitation force of the motor can be reduced, the magnetic flux density of the motor is optimized, the torque pulsation is reduced, and the vibration and the noise of the motor are reduced. In the present embodiment, the mounting groove 20 and the extending direction of each air groove are both provided along the axial direction of the rotor 10, and the mounting groove 20 and each air groove penetrate the rotor 10.

In this embodiment, on a plane perpendicular to the center line of the rotor 10, a connection line between a point on the distal edge of the first mounting groove 20 in the mounting cavity, which is closest to the second mounting groove 20, and a midpoint of the rotor 10 is a first connection line, a connection line between a point on the distal edge of the second mounting groove 20 in the mounting cavity, which is closest to the first mounting groove 20, and a midpoint of the rotor 10 is a second connection line, and an included angle between the second connection line and the first connection line is a 0; the first air groove 41 is an arc-shaped groove extending along the circumferential direction of the rotor 10, the extension lines of the two side edges of the first air groove 41 pass through the center of the rotor 10, and the included angle between the two side edges of the first air groove 41 is a 1; wherein A1/A0 is 0.15-0.25. The larger the a1/a0 is, the larger the space occupied by the first air groove 41 is, the more remarkable the balance optimization magnetic flux density effect is, the smaller torque pulsation is obtained, and the larger the magnetic resistance is, but the larger the magnetic resistance is, the more rapid decrease of the electromagnetic torque is caused. The parameter scanning is carried out by simulation software, and the A1/A0 is preferably in the range of 0.15-0.25. This arrangement can balance the oscillogram for optimizing magnetic density: thus, a large effective value of magnetic flux density and a small torque ripple can be obtained.

In the present embodiment, the second air groove 42 is an arc-shaped groove extending along the circumferential direction of the rotor 10, the extension lines of the two side edges of the second air groove 42 both pass through the center of the rotor 10, and the included angle between the two side edges of the second air groove 42 is a 2; A2/A0 is 0.04-0.08. The larger the a2/a0 is, the larger the space occupied by the second air groove 42 is, the more remarkable the balance optimization magnetic flux density effect is, the smaller torque pulsation is obtained, and the larger the magnetic resistance is, but the larger the magnetic resistance is, the more rapid decrease of the electromagnetic torque is caused. The parameter scanning is carried out by simulation software, and the A2/A0 is better in the range of 0.04-0.08. This arrangement can balance the oscillogram for optimizing magnetic density: thus, a large effective value of magnetic flux density and a small torque ripple can be obtained.

In the present embodiment, the third air groove 43 is an arc-shaped groove extending along the circumferential direction of the rotor 10, the extension lines of the two side edges of the third air groove 43 both pass through the center of the rotor 10, and the included angle between the two side edges of the third air groove 43 is a 3; A3/A0 is 0.07-0.13. The larger the A3/a0 is, the larger the space occupied by the third air groove 43 is, the more remarkable the balance optimization magnetic flux density effect is, the smaller torque pulsation is obtained, and the larger the magnetic resistance is, but the larger the magnetic resistance is, the more rapid decrease of the electromagnetic torque is caused. The parameter scanning is carried out by simulation software, and the A3/A0 is preferably in the range of 0.07-0.13. This arrangement can balance the oscillogram for optimizing magnetic density: thus, a large effective value of magnetic flux density and a small torque ripple can be obtained.

In the present embodiment, the first air groove 41 is an arc-shaped groove extending in the circumferential direction of the rotor 10, the distance between the first air groove 41 and the outer wall of the rotor 10 in the radial direction of the rotor 10 is T0, and the width of the first air groove 41 is T1; T1/T0 is 0.4-0.7. The excessive restraint of too large magnetic lines of force of T1/T0, the torque is reduced, and the structural strength of the rotor is reduced; the T1/T0 is too small, and the first air slot 41 is too far from the air gap, so that the magnetic force lines cannot be effectively adjusted, and the electromagnetic force is deteriorated. Parameter scanning is carried out through Ansoft simulation software, and t1/t10 is preferably 0.4-0.7: the strength of the rotor 10 can be ensured, a larger electromagnetic torque can be obtained, the magnetic flux density waveform can be optimized, and a smaller torque ripple can be obtained.

In the present embodiment, the second air groove 42 is an arc-shaped groove extending in the circumferential direction of the rotor 10, and the width of the second air groove 42 in the radial direction of the rotor 10 is T2, and T2/T1 is 1 to 1.1. The arrangement can ensure the structural strength of the rotor 10, obtain larger electromagnetic torque, optimize magnetic flux density waveform and obtain smaller torque pulsation.

Further, the third air groove 43 is an arc-shaped groove extending in the circumferential direction of the rotor 10, and the width of the third air groove 43 in the radial direction of the rotor 10 is T3, and T3/T1 is 1 to 1.1. The arrangement can ensure the structural strength of the rotor 10, obtain larger electromagnetic torque, optimize magnetic flux density waveform and obtain smaller torque pulsation.

In the present embodiment, two mounting grooves 20 in the mounting cavity are symmetrically arranged with respect to a preset plane passing through the center line of the rotor 10; in the area enclosed by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10, there are two air groove sets, which are arranged symmetrically with respect to the predetermined plane. Through the arrangement, the exciting force of the motor can be further reduced, the magnetic flux density of the motor is optimized, and the torque pulsation is reduced, so that the vibration and the noise of the motor are reduced.

In the present embodiment, the second air groove 42 is located on the side of the first air groove 41 away from the center line of the rotor 10; the second air slot 42 is located on the side of the third air slot 43 away from the centerline of the rotor 10; the second air groove 42 is located between the first air groove 41 and the third air groove 43 in the circumferential direction of the rotor 10.

Further, a first separation groove 21 is formed in the region between the inner wall of the distal end of the mounting groove 20 and the permanent magnet 30 positioned in the mounting groove 20, and a second separation groove 22 is formed in the region between the inner wall of the proximal end of the mounting groove 20 and the permanent magnet 30 positioned in the mounting groove 20; the installation cavity is a plurality of, and a plurality of installation cavities distribute on rotor 10 along rotor 10's circumference. The provision of the first slots 21 and the second slots 22 reduces the obstruction and facilitates the formation of the predetermined magnetic field.

In this embodiment, the rotor 10 is formed by laminating a plurality of punching sheets, and paint is soaked in a gap between two adjacent punching sheets. Therefore, the rigidity and the damping of the rotor 10 are high, the fixed frequency of the rotor 10 is improved, and the low-frequency noise of the starting of the main drive motor is reduced. Specifically, the rotor 10 is laminated by a soft magnetic material sheet and then dipped in paint by VPI vacuum pressure so that the insulating paint penetrates between the laminations to produce a paint film.

In this embodiment, the rotor assembly further includes permanent magnets 30 and a main shaft 50 engaged with the rotor 10. A main shaft 50 is inserted into the rotor 10 to drive the rotor 10 to rotate.

Another embodiment of the invention also provides a permanent magnet motor which comprises the rotor assembly provided above. A rotor 10 is arranged in a rotor component of the permanent magnet motor; the mounting cavity is arranged in the rotor 10, two mounting grooves 20 are formed in the mounting cavity, an included angle is formed between the two mounting grooves 20, the mounting grooves 20 are used for mounting permanent magnets 30, two ends of each mounting groove 20 are respectively a near end and a far end, and the distance between the far end of each mounting groove 20 and the center line of the rotor 10 is greater than the distance between the near end of each mounting groove 20 and the center line of the rotor 10; and the air groove group is arranged in the rotor and is positioned in an area enclosed by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10, and the air groove group comprises a first air groove 41, a second air groove 42 and a third air groove 43 which are arranged at intervals. The first air groove 41, the second air groove 42 and the third air groove 43 are arranged in the area surrounded by the two mounting grooves 20 of the mounting cavity and the outer wall of the rotor 10 at intervals, so that the excitation force of the motor can be reduced, the magnetic flux density of the motor is optimized, the torque pulsation is reduced, and the vibration and the noise of the motor are reduced.

To facilitate an understanding of the effects of the above, a comparative example of a particular rotor assembly is described. The first order fixed frequency of the rotor 10 before dipping paint is at 570HZ, and the amplitude is 0.07; the first-order fixed frequency of the rotor 10 after paint dipping is 1800HZ, the amplitude at 570HZ after paint dipping is 0.01, and the amplitude is effectively reduced by 85.7%; the first-order fixed frequency is improved by about 2.2 times. The permanent magnet motor adopting the scheme is applied to the electric automobile, can be effectively fixed with an axle and can avoid frequency, resonance is avoided, and low-frequency noise of the motor during starting and accelerating is greatly reduced.

The torque ripple of the main drive motor without the air groove is 2.91%, the torque ripple is 1.47% after the scheme is implemented, and the torque ripple is reduced by 50%; the contrast of the motor exciting force of the original scheme and the scheme can be known: the exciting force under different frequency doubling is reduced compared with the original scheme, wherein the exciting force is maximum at 72 frequency doubling and is reduced by 44 percent compared with the exciting force.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.