CN110912304B

CN110912304B - Motor rotor, motor, compressor and air conditioner

Info

Publication number: CN110912304B
Application number: CN201911025869.0A
Authority: CN
Inventors: 刘进超; 周博; 张辉; 廖文华
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2021-11-30
Anticipated expiration: 2039-10-25
Also published as: CN110912304A

Abstract

The application provides a motor rotor, motor, compressor and air conditioner. This electric motor rotor includes rotor core (1), be provided with magnetic steel groove (2) on rotor core (1), in the plane of the central axis of perpendicular to rotor core (1), the periphery of rotor core (1) includes first circular arc section (3) and second circular arc section (4) that set up in turn and connect gradually along circumference, the centre of a circle of first circular arc section (3) is located d epaxially, and first circular arc section (3) are about d axisymmetric, distance between the centre of a circle of first circular arc section (3) and the center of rotor core (1) is L1, the centre of a circle of second circular arc section (4) and the center coincidence of rotor core (1), and second circular arc section (4) are about q axisymmetric. According to the motor rotor provided by the application, the radial electromagnetic force waves of the low order of the motor can be effectively reduced, and then the vibration and the noise of the compressor are reduced.

Description

Motor rotor, motor, compressor and air conditioner

Technical Field

The application relates to the technical field of electrical equipment, in particular to an electric motor rotor, an electric motor, a compressor and an air conditioner.

Background

In recent years, with the rapid development of power electronic technology, microelectronic technology, novel motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors can be rapidly popularized and applied. Compared with the traditional electrically excited synchronous motor, the permanent magnet synchronous motor, especially the rare earth permanent magnet synchronous motor has the advantages of less loss, high efficiency and obvious electricity-saving effect. The permanent magnet synchronous motor is excited by the permanent magnet, so that the structure of the motor is simpler, the processing and assembly cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, and the running reliability of the motor is improved; and because the efficiency and the power density of the motor are improved because of no need of exciting current and no exciting loss, the motor is a motor which is researched more in recent years and is applied more and more widely in various fields.

At present, the standards of the industry for vibration and noise of compressors are higher and higher, a motor is used as a power source of the compressors and is a main factor of vibration and noise of the compressors, and low-order radial electromagnetic force waves are an important reason for generating vibration noise of the motor.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a motor rotor, motor, compressor and air conditioner, can effectively reduce the radial electromagnetic wave of motor low order, and then reduce the vibration and the noise of compressor.

In order to solve the problem, the application provides an electric motor rotor, including rotor core, the last magnetic steel groove that is provided with of rotor core, in the plane of the central axis of perpendicular to rotor core, rotor core's periphery includes first circular arc section and the second circular arc section that sets up and connect gradually along circumference in turn, the centre of a circle of first circular arc section is located d epaxially, and first circular arc section is about d axisymmetric, the distance between the centre of a circle of first circular arc section and rotor core's the center is L1, the centre of a circle of second circular arc section and rotor core's center coincidence, and the second circular arc section is about q axisymmetric.

Preferably, the radius of the first circular arc segment is Rd, and the radius of the second circular arc segment is Rq, wherein 0.85 < Rd/Rq < 1.

Preferably, the distance between the center of the rotor core and the first arc segment on the d-axis is L, wherein 0 < L1/L < 0.1.

Preferably, the included angle between the d axis and the q axis is a1, a1 is 90 °/p, p is the number of pole pairs of the rotor, and under the same magnetic pole, the line connecting the intersection point of the first circular arc segment and the second circular arc segment and the center of the rotor core forms an included angle a2 with the d axis, wherein 0.5 < a2/a1 < 0.63.

Preferably, the part of the rotor core, which is positioned at the radial outer side of the magnetic steel slot, is provided with a magnetic isolation hole group.

Preferably, the magnetic isolation hole group comprises a first hole group and a second hole group, the first hole group is located in the fan-shaped area corresponding to the first circular arc section, and the second hole group is located in the fan-shaped area corresponding to the second circular arc section.

Preferably, the second arc segment is provided with a first groove, the first groove is a trapezoidal groove with gradually reduced width along the radial inward direction, and the first groove is symmetrical about the q axis.

Preferably, the second punch combination includes first magnetism isolating hole and second magnetism isolating hole, and first magnetism isolating hole sets up the radial outer end in magnetism steel groove to communicate with the magnet steel groove, and the second magnetism isolating hole sets up in one side that first magnetism isolating hole is close to the d axle, is provided with the second recess on the second circular arc section, and the second recess is located first magnetism isolating hole and second in circumference between the magnetism isolating hole.

Preferably, an included angle a3 is formed between a connecting line between the center of the bottom of the second groove and the center of the rotor core and the q axis, wherein 6 degrees is less than a3 degrees is less than 8 degrees; and/or the second groove is in transition connection with the second arc section through an arc.

Preferably, the second groove is a circular arc groove or a polygonal groove.

Preferably, the equal distance between each magnetic shielding hole of the magnetic shielding hole group and the circular arc section of the region where the magnetic shielding hole group is located is d1, wherein d1 is more than or equal to 0.5 and less than or equal to 0.7.

Preferably, the rotor core is provided with a rivet hole and/or a flow hole, and the rivet hole and/or the flow hole are located on the q axis and are symmetrical about the q axis.

According to another aspect of the present application, there is provided an electric machine comprising an electric machine rotor as described above.

According to another aspect of the present application, there is provided a compressor including the above-described motor rotor or the above-described motor.

According to another aspect of the present application, there is provided an air conditioner including a compressor, the compressor being the above-mentioned compressor.

The application provides an electric motor rotor, including rotor core, the last permanent magnetism mounting groove that is provided with of rotor core, at the perpendicular to in the plane of rotor core's the central axis, rotor core's periphery includes first circular arc section and the second circular arc section that sets up in turn and connect gradually along circumference, the centre of a circle of first circular arc section is located d epaxially, just first circular arc section is about d axisymmetric, the centre of a circle of first circular arc section with distance between rotor core's the center is L1, the centre of a circle of second circular arc section with rotor core's center coincidence, just second circular arc section is about q axisymmetric. In this application, through setting up rotor core into the excircle structure that eccentric circular arc and perfect circle structure combined together, can make this electric motor rotor's outer circumference form irregular circular to and motor stator between form inhomogeneous air gap, utilize eccentric circular arc and perfect circle circular arc matched with structure adjustment air gap flux density, make the air gap flux density of motor more sinusoidal, effectively reduce 0 rank radial force ripples, and then reduce the vibration and the noise of compressor.

Drawings

Fig. 1 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present application;

FIG. 2 is a first dimensional block diagram of a rotor of an electric machine according to an embodiment of the present application;

FIG. 3 is a second dimensional block diagram of a rotor of an electric machine according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a motor according to an embodiment of the present application;

fig. 5 is a graph comparing 0 order radial force waves for a motor of an embodiment of the present application with a prior art motor.

The reference numerals are represented as:

1. a rotor core; 2. a magnetic steel groove; 3. a first arc segment; 4. a second arc segment; 5. a first group of holes; 6. a second group of holes; 7. a first groove; 8. a second groove; 9. a first magnetism isolating hole; 10. a second magnetism isolating hole; 11. rivet holes; 12. a flow-through hole; 13. and (5) magnetic steel.

Detailed Description

With reference to fig. 1 to 5, according to an embodiment of the present application, the electric motor rotor includes a rotor core 1, a magnetic steel slot 2 is provided on the rotor core 1, in a plane perpendicular to a central axis of the rotor core 1, a periphery of the rotor core 1 includes a first arc segment 3 and a second arc segment 4 that are alternately arranged along a circumferential direction and are sequentially connected, a circle center of the first arc segment 3 is located on a d axis, and the first arc segment 3 is symmetric about the d axis, a distance between a circle center of the first arc segment 3 and a center of the rotor core 1 is L1, a circle center of the second arc segment 4 coincides with a center of the rotor core 1, and the second arc segment 4 is symmetric about the q axis.

In this application, through set up rotor core into the eccentric circular arc for rotor core center eccentric and with the excircle structure that rotor core center coincidence's right circular arc combined together, can make this electric motor rotor's outer circumference form irregular circular, thereby and form inhomogeneous air gap between the motor stator, utilize eccentric circular arc and right circular arc matched with structure adjustment air gap flux density, make the air gap flux density of motor more sinusoidal, effectively reduce 0 rank radial force ripples, and then reduce the vibration and the noise of compressor.

In this embodiment, first circular arc section 3 and second circular arc section 4 are along rotor core 1's circumference evenly distributed to form evenly distributed's air gap structure in rotor core 1's week side, make to form whole periodic variation between electric motor rotor and the motor stator, the air gap of local inhomogeneous change, thereby conveniently form sinusoidal air gap magnetic density more, effectively reduce motor noise. As shown in fig. 1, the first arc segment 3 and the second arc segment 4 intersect at point a.

Preferably, the radius of the first arc section 3 is Rd, the radius of the second arc section 4 is Rq, wherein 0.85 < Rd/Rq < 1, the radius of the first arc section 3 can be limited within a certain range, and the problem that the fluctuation of the air gap of the motor is too large due to the fact that the radius of the first arc section 3 is too small, and the fluctuation of the motor is too large and the noise is increased in the operation process of the motor is avoided.

On the d axle, the distance between the center of rotor core 1 and first circular arc section 3 is L, wherein 0 < L1/L < 0.1, can further control the eccentric distance between first circular arc section 3 for the center of rotor core 1 in reasonable scope, can form the air gap magnetic field of even periodic variation, can avoid producing too big torque ripple simultaneously, improves motor operating stability, reduces motor noise.

An included angle between the d axis and the q axis is a1, a1 is 90 °/p, p is the number of pole pairs of the rotor, and an included angle a2 is formed between a connecting line between the intersection point of the first circular arc section 3 and the second circular arc section 4 and the center of the rotor core 1 and the d axis under the same magnetic pole, wherein a2/a1 is more than 0.5 and less than 0.63.

By limiting the ratio relation between a2 and a1, a2 can be limited through a1, and then the outer circle profile of the motor rotor can be limited, so that the outer circle profile of the motor rotor in the angle range can effectively reduce the 0-order 18-frequency multiplication radial force wave of the motor.

The part of the rotor core 1, which is positioned at the radial outer side of the magnetic steel slot 2, is provided with a magnetic isolation hole group.

The magnetic isolation hole group comprises a first hole group 5 and a second hole group 6, the first hole group 5 is located in a fan-shaped area corresponding to the first circular arc section 3, and the second hole group 6 is located in a fan-shaped area corresponding to the second circular arc section 4.

The first hole group 5 includes a plurality of third magnetism isolating holes, the plurality of third magnetism isolating holes extend along the radial direction of the rotor core 1, the plurality of third magnetism isolating holes are rectangular, and the third magnetism isolating holes located on two sides of the d axis under the same pole are symmetrical about the d axis.

The second arc section 4 is provided with a first groove 7, the first groove 7 is a trapezoidal groove with gradually reduced width along the radial inward direction, and the first groove 7 is symmetrical about the q axis. The trapezoidal groove is formed in the q axis, so that the positive and negative connection positions of the air gap flux density can be smoother, and the air gap flux density distribution of the air gap flux density is improved.

The second punch combination 6 comprises a first magnetism isolating hole 9 and a second magnetism isolating hole 10, the first magnetism isolating hole 9 is arranged at the radial outer end of the magnetic steel groove 2 and communicated with the magnetic steel groove 2, the second magnetism isolating hole 10 is arranged at one side, close to the d shaft, of the first magnetism isolating hole 9, a second groove 8 is arranged on the second circular arc section 4, and the second groove 8 is circumferentially located between the first magnetism isolating hole 9 and the second magnetism isolating hole 10. Through setting up second recess 8, can weaken the arch of this department air gap flux density curve for air gap flux density distributes more evenly, improves motor operating performance.

Through setting up first recess 7 and second recess 8, can increase the magnetic resistance that sets up the air gap of two groove departments, reduce air gap flux density harmonic, and then reduce radial electromagnetic force ripples, and then reduce the vibration and the noise of compressor.

Preferably, an angle a3 is formed between a line connecting the center of the bottom of the second groove 8 and the center of the rotor core 1 and the q-axis, wherein 6 ° < a3 < 8 °. As shown in fig. 1, the bottom center of the second groove 8 is point B. The arrangement position of the second groove 8 can be limited by limiting the angle of a3, and the second groove 8 can optimally sine the air gap flux density of the motor, so that the radial force wave is reduced.

Through circular arc transitional coupling between second recess 8 and the second circular arc section 4, can realize the rounding off between second recess 8 and the second circular arc section 4, guarantee the continuity of periphery wall surface structure change, and then guarantee the sinusoidal continuity of the air gap flux density that forms.

Preferably, the radius r of the circular arc is in the range of 0 < r < 10mm, and in the range, the radius of the circular arc is far larger, and the optimization effect is better.

The second groove 8 is, for example, a circular arc groove or a polygonal groove.

The equal distance between each magnetism isolating hole of magnetism isolating hole group and the circular arc section of its place is d1, wherein d1 is more than or equal to 0.5 and less than or equal to 0.7, can enough avoid magnetism isolating bridge width that forms between magnetism isolating hole and each circular arc section too little can not play effectual connection reinforcing effect, can avoid magnetism isolating bridge width too big to cause great magnetic leakage again, reduces the working property of motor.

Preferably, the rotor core 1 is provided with a rivet hole 11 and/or a flow hole 12, and the rivet hole 11 and/or the flow hole 12 are located on the q-axis and are symmetrical with respect to the q-axis.

The motor rotor also comprises a magnetic steel 13, and the magnetic steel 13 is arranged in the magnetic steel groove 2. Preferably, the magnetic steel grooves 2 under the same pole are V-shaped grooves. The magnetic steel slot 2 can also be in a straight line shape or other shapes.

According to an embodiment of the application, the motor comprises a motor rotor, and the motor rotor is the motor rotor.

Referring to fig. 5 in combination, after the motor of the present application is adopted, compared with the prior art, the frequency multiplication amplitude of the 0-order radial force wave 18 of the present application is reduced by 75.3%, and after the optimization scheme of the present application is adopted, the frequency multiplication amplitude of 18 is reduced by 88.3% compared with the prior art, so that the vibration and noise of the motor can be greatly optimized, and the vibration and noise of the compressor can be reduced.

According to an embodiment of the present application, a compressor includes the above-described motor rotor or the above-described motor.

According to an embodiment of the present application, an air conditioner includes a compressor, which is the above-described compressor.

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

1. The motor rotor is characterized by comprising a rotor core (1), wherein a magnetic steel groove (2) is formed in the rotor core (1), a first arc section (3) and a second arc section (4) which are alternately arranged along the circumferential direction and sequentially connected are arranged on the periphery of the rotor core (1) in a plane perpendicular to the central axis of the rotor core (1),

the circle center of the first arc section (3) is positioned on the d axis, the first arc section (3) is symmetrical about the d axis, the distance between the circle center of the first arc section (3) and the center of the rotor core (1) is L1,

the circle center of the second arc section (4) is superposed with the center of the rotor core (1), and the second arc section (4) is symmetrical about the q axis;

the rotor core (1) forms an outer circumferential structure combined by a first arc section (3) eccentric relative to the center of the rotor core (1) and a second arc section (4) coincident with the center of the rotor core (1);

the radius of the first circular arc section (3) is Rd, the radius of the second circular arc section (4) is Rq, and the Rd/Rq is more than 0.85 and less than 1.

2. An electric machine rotor according to claim 1, characterized in that the distance between the centre of the rotor core (1) and the first circular arc segment (3) on the d-axis is L, where 0 < L1/L < 0.1.

3. An electric machine rotor according to claim 1, characterized in that the included angle between the d-axis and the q-axis is a1, a1 is 90 °/p, p is the number of rotor pole pairs, and the line between the intersection point of the first circular arc segment (3) and the second circular arc segment (4) and the center of the rotor core (1) forms an included angle a2 with the d-axis under the same magnetic pole, wherein 0.5 < a2/a1 < 0.63.

4. An electric machine rotor according to any of claims 1-3, characterized in that the part of the rotor core (1) radially outside the magnet steel slots (2) is provided with a set of magnet-isolating holes.

5. An electric machine rotor according to claim 4, characterised in that the magnetic separation hole sets comprise a first hole set (5) and a second hole set (6), the first hole set (5) being located in a sector area corresponding to the first circular arc segment (3) and the second hole set (6) being located in a sector area corresponding to the second circular arc segment (4).

6. An electric machine rotor according to claim 5, characterised in that the second circular arc segment (4) is provided with a first groove (7), the first groove (7) being a trapezoidal groove with decreasing width in the radially inward direction, the first groove (7) being symmetrical about the q-axis.

7. The electric motor rotor according to claim 5, characterized in that the second hole group (6) comprises a first magnetism isolating hole (9) and a second magnetism isolating hole (10), the first magnetism isolating hole (9) is arranged at the radial outer end of the magnetic steel slot (2) and is communicated with the magnetic steel slot (2), the second magnetism isolating hole (10) is arranged at one side of the first magnetism isolating hole (9) close to the d axis, a second groove (8) is arranged on the second circular arc section (4), and the second groove (8) is circumferentially arranged between the first magnetism isolating hole (9) and the second magnetism isolating hole (10).

8. An electric machine rotor according to claim 7, characterized in that a line between the centre of the bottom of the second groove (8) and the centre of the rotor core (1) forms an angle a3 with the q-axis, where 6 ° < a3 < 8 °; and/or the second groove (8) is in transition connection with the second arc section (4) through an arc.

9. An electric machine rotor, according to claim 7 or 8, characterised in that said second groove (8) is a circular or polygonal groove.

10. The motor rotor as claimed in claim 4, wherein the equal distance between each magnetic shielding hole of the magnetic shielding hole group and the circular arc segment of the region is d1, wherein d1 is 0.5-0.7.

11. An electric machine rotor according to claim 1, characterized in that the rotor core (1) is provided with rivet holes (11) and/or flow holes (12), the rivet holes (11) and/or flow holes (12) being located on the q-axis and being symmetrical about the q-axis.

12. An electric machine comprising a machine rotor, characterized in that the machine rotor is a machine rotor according to any one of claims 1-11.

13. A compressor, characterized by comprising an electric machine rotor as claimed in any one of claims 1 to 11 or an electric machine as claimed in claim 12.

14. An air conditioner comprising a compressor, wherein said compressor is the compressor of claim 13.