CN117767596A - Stator core, stator, motor and compressor - Google Patents

Abstract

The invention provides a stator core, a stator, a motor and a compressor, wherein the stator core comprises an annular stator yoke part, the outer side wall of the stator yoke part is provided with a plurality of protruding parts, the protruding parts are uniformly distributed along the circumference of the circle center of the stator core, and buffer grooves penetrating through the two axial ends of the stator core are arranged in each protruding part; the stator core is propped against the inner wall of the motor shell through each protruding part, and the wall thickness between the outer wall of each protruding part and the corresponding buffer groove can be deformed. According to the technical scheme of the invention, the structure of the matching of the protruding parts and the buffer grooves can enable the assembly deformation of the whole stator to basically only occur in each protruding part, so that the deformation displacement of the stator yoke part and the stator teeth on the inner side of the stator can be reduced, the integral deformation of the stator during hot sleeve assembly is reduced, and noise and vibration generated by irregular deformation during the operation of the compressor are reduced; and the air gap of the motor can be ensured to be uniform, and the running efficiency of the motor is improved.

Description

Stator core, stator, motor and compressor

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a stator core, a stator, a motor and a compressor.

Background

The permanent magnet synchronous motor has the characteristics of high torque density, low manufacturing cost, high efficiency, wide area and the like, is widely applied to the field of home electric air conditioner compressors, wherein the stator of the compressor is mostly in interference fit with the shell during assembly, irregular deformation of the stator is easy to occur in the assembly process, a motor magnetic circuit is affected, the motor air gap is caused to be uneven, the iron loss of the motor operation is increased, the input power is increased, the compressor energy is reduced, and meanwhile, the irregular deformation can cause larger noise and vibration during the motor operation.

Disclosure of Invention

Therefore, the invention provides a stator core, a stator, a motor and a compressor, and the technical problems to be solved mainly are as follows: how to reduce the deformation amount of the stator thermal sleeve, reduce the operation vibration and noise of the compressor and improve the motor efficiency.

In order to solve the above problems, the present invention provides a stator core, which includes a stator yoke having a ring shape, wherein the outer sidewall of the stator yoke has a plurality of protruding portions, the plurality of protruding portions are uniformly distributed circumferentially around the center of the stator core, and buffer slots penetrating through two axial ends of the stator core are provided in each protruding portion;

the stator core is propped against the inner wall of the motor shell through the protruding parts, and the wall thickness between the outer wall of each protruding part and the corresponding buffer groove can be deformed.

In some embodiments, each buffer slot is a symmetrical slot body, and a symmetrical plane of each buffer slot passes through the center of the stator core.

In some embodiments, each buffer tank is provided with a first buffer tank body and a second buffer tank body which are spaced and symmetrically arranged;

the interval between the first buffer groove body and the second buffer groove body in each buffer groove is H, and the width of each buffer groove body along the radial direction of the stator core is L, wherein L is more than H.

In some embodiments, the stator core further comprises a plurality of stator teeth, wherein the plurality of stator teeth are all arranged on the inner wall of the stator yoke part and are uniformly distributed circumferentially around the center of the stator core;

stator grooves are formed between every two adjacent stator teeth, wherein the number of the protruding parts is equal to that of the stator grooves and corresponds to that of the stator grooves one by one; the outer side wall of each protruding part is opposite to the bottom surface of the corresponding stator groove.

In some embodiments, each of the stator slots is a symmetrical slot body, and each of the protrusions is symmetrical about a plane of symmetry of the corresponding stator slot.

In some embodiments, in a section perpendicular to the axis of the stator core, for any one of the protruding portions, there are opposite first and second ends in the circumferential direction of the stator core, a line connecting the first end to the center of the stator core is a first line segment, a line connecting the second end to the center of the stator core is a second line segment, and the buffer groove in the protruding portion is located between the first line segment and the second line segment.

In some embodiments, in a cross section perpendicular to the axis of the stator core, for any one of the projections, the arc length between its circumferentially opposite ends along the stator core is R1, and the arc length between its circumferentially opposite ends along the stator core of the buffer slot in the projection is R2, where R1 > R2 > 0.8R 1.

In some embodiments, the minimum distance between each buffer slot and the outer circle of the stator core is D1, and the width of each buffer slot along the radial direction of the stator core is L, where L > D1.

In some embodiments, each buffer slot has a width L along the radial direction of the stator core, and the stator yoke has a maximum width D2 along the radial direction of the stator core, wherein D2 > 5*L.

The invention also provides a stator, which can comprise the stator core.

The invention also provides an electric machine which may comprise a stator as described in the foregoing.

The invention also provides a compressor which may include a motor as described in the foregoing.

The stator core, the stator, the motor and the compressor provided by the invention have the following beneficial effects:

1. the structure of the protruding part and the buffer groove can enable the assembly deformation of the whole stator to basically only occur in each protruding part, and particularly, the assembly deformation of the whole stator can occur at the wall thickness between the outer wall of each protruding part and the corresponding buffer groove, so that the deformation displacement of the stator yoke part and the stator teeth on the inner side of the stator can be reduced, the whole deformation of the stator during hot sleeve assembly is reduced, and the noise, vibration and vibration absorption energy generated by irregular deformation during the operation of the compressor are reduced.

2. Because the deformation of the stator during assembly basically occurs in each protruding part, the stator yoke part and the stator teeth basically do not deform at the inner side of the stator, so that the air gap uniformity of the motor can be ensured, the air gap flux density harmonic content of the motor is reduced, and the excitation vibration of the motor due to the harmonic is reduced; meanwhile, the iron loss generated by harmonic waves can be reduced, and the running efficiency of the motor is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The drawings in the following description are merely exemplary and other implementations drawings may be derived from the drawings provided without inventive effort for a person skilled in the art.

Fig. 1 is a top view of a stator core of the present invention;

FIG. 2 is a schematic view of a portion of a stator core;

FIG. 3 shows a comparison of motor efficiency at nominal frequency for a motor of the present invention versus a conventional motor;

fig. 4 shows a graph of the magnitude of each order of the back emf harmonic versus the back emf harmonic content for a motor according to the present invention versus a conventional motor.

The reference numerals are:

1. a stator yoke; 2. stator teeth; 3. a stator groove; 4. a protruding portion; 5. a buffer tank; 31. a bottom surface; 41. an outer circle connecting rib; 42. a connecting rib; 51. a first buffer tank; 52. and a second buffer tank.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

Referring to fig. 1 to 2 in combination, according to an embodiment of the present invention, there is provided a stator core including a stator yoke 1 having a ring shape. The outer side wall of the stator yoke 1 is provided with a plurality of protruding parts 4, and the protruding parts 4 are uniformly distributed along the circumference around the center of the stator core. Buffer grooves 5 penetrating through two axial ends of the stator core are arranged in each protruding part 4. Wherein, the stator core is propped against the inner wall of the motor shell through each protruding part 4, and the wall thickness between the outer wall of each protruding part 4 and the wall of the corresponding buffer groove 5 can be deformed.

In the above example, the structure of the protruding portion 4 and the buffer slot 5 in cooperation enables the assembly deformation of the whole stator to basically only occur in each protruding portion 4, specifically, all occur at the wall thickness between the outer wall of each protruding portion 4 and the corresponding buffer slot 5, so that the deformation displacement of the stator yoke portion 1 and the stator teeth 2 inside the stator can be reduced, and the whole deformation of the stator during hot jacket assembly is reduced, thereby being beneficial to reducing noise and vibration generated by irregular deformation and absorbing energy generated by vibration during operation of the compressor.

In addition, as the deformation of the stator during assembly basically occurs in each protruding part 4, the stator yoke part 1 and the stator teeth 2 basically do not deform at the inner side of the stator, so that the uniform air gap of the motor can be ensured, the magnetic flux density harmonic content of the air gap of the motor is reduced, and the excitation vibration of the motor due to the harmonic is reduced; meanwhile, the iron loss generated by harmonic waves can be reduced, and the running efficiency of the motor is further improved.

Fig. 3 shows a comparison of motor efficiency at nominal frequency for a motor according to the present invention versus a motor according to a conventional scheme. Here, "this patent scheme" in fig. 3 means that the motor employs the above-described stator core having the protruding portion 4 and the buffer groove 5, and "conventional scheme" in fig. 3 means that the stator core of the motor is a conventional stator core without the protruding portion 4 and the buffer groove 5. As can be seen from fig. 3, the motor efficiency is significantly improved by using the stator core having the protruding portion 4 and the buffer slot 5.

In some embodiments, each buffer slot 5 may be a symmetrical slot body, and the symmetry plane of each buffer slot 5 passes through the center of the stator core, so that the influence of each buffer slot 5 on the magnetic circuit of the stator yoke 1 can be reduced, the magnetic resistance of the stator yoke 1 is reduced, the iron loss during the operation of the motor is reduced, and the performance of the motor is improved.

In a specific application example, as shown in fig. 2, each of the buffer tanks 5 has a first buffer tank body 51 and a second buffer tank body 52 which are arranged at intervals and symmetrically. Wherein, the first buffer tank 51 and the second buffer tank 52 may both be V-shaped with the opening of the V-shape facing the center of the stator core. Wherein, the included angle between the first buffer groove body 51 and the second buffer groove body 52 in the buffer groove 5 is beta, and 180 degrees is more than beta and more than 120 degrees.

In the above example, by limiting the angle between the first buffer tank 51 and the second buffer tank 52 in the buffer tank 5, the structural strength of the buffer tank 5 can be ensured.

What needs to be explained here is: the two ends of each buffer groove body can be round, sharp corner or flat top.

Further, as shown in fig. 2, the intervals between the first buffer tank 51 and the second buffer tank 52 in each buffer tank 5 are all H, and the widths of each buffer tank along the radial direction of the stator core are all L. Wherein L > H.

In the above example, the interval between the first buffer tank body 51 and the second buffer tank body 52 in each buffer tank 5 forms the connection rib 42, and the arrangement of the connection rib 42 can increase the structural strength of the buffer tank 5; and the connecting ribs 42 are arranged in the middle of the buffer tank 5 to play a supporting role, so that stress transmitted by the shell can be absorbed more uniformly. In addition, by making L > H, the structural strength of the buffer tank 5 and the deformation amount requirement of the stator can be balanced.

In some embodiments, as shown in fig. 1, the foregoing stator core further includes a plurality of stator teeth 2, where the plurality of stator teeth 2 are disposed on an inner wall of the stator yoke 1 and are uniformly distributed circumferentially around a center of the stator core. Stator slots 3 are formed between each two adjacent stator teeth 2. Wherein, the number of the protruding parts 4 is equal to the number of the stator grooves 3 and corresponds to one. The outer side wall of each projection 4 is opposed to the bottom surface 31 of the corresponding stator groove 3.

In the above example, by the corresponding arrangement of the protruding portions 4 and the stator grooves 3, the buffer grooves 5 in each protruding portion 4 can absorb stator stress more uniformly, reduce the deformation amount of the stator, ensure the structural strength of the stator yoke 1, and ensure the coaxiality of each stator tooth 2.

In some embodiments, as shown in fig. 1, each stator slot 3 is a symmetrical slot body, and each protruding portion 4 is symmetrical with respect to the symmetry plane of the corresponding stator slot 3, so that the stator stress can be absorbed more uniformly, the deformation of the stator is further reduced, the structural strength of the stator yoke portion 1 is ensured, and the coaxiality of each stator tooth 2 is ensured.

In some embodiments, as shown in fig. 1, in a section perpendicular to the axis of the stator core, for any protruding portion 4, which has a first end and a second end opposite in the circumferential direction of the stator core, a line connecting the first end and the center of the stator core is a first line segment a1, a line connecting the second end and the center of the stator core is a second line segment a2, a buffer groove 5 in the protruding portion 4 is located between the first line segment a1 and the second line segment a 2.

In the above example, as shown in fig. 2, the wall thickness between the outer wall of each protruding portion 4 and the corresponding buffer groove 5 forms the outer circumferential connecting rib 41. Through the above-mentioned size design, make the structure of buffer tank 5 can not too big, the excircle tie bar 41 width can not be too little, keep the supporting role of outer assistance tie bar 42, let the structure of stator yoke 1 more reasonable, guarantee stator yoke 1 excircle structural strength.

In some embodiments, as shown in fig. 1, in a section perpendicular to the axis of the stator core, for any one of the protruding portions 4, the arc length between its opposite ends in the circumferential direction of the stator core is R1, and the arc length between its opposite ends in the circumferential direction of the stator core is R2 for the buffer groove 5 in that protruding portion 4. Wherein R1 > R2 > 0.8R 1.

In the above example, through the above-mentioned size design, make buffer tank 5 have sufficient groove space to absorb the deformation volume to further reduce the deformation of stator, guarantee that former magnetic circuit structure walks according to the design magnetic circuit, reduce the inside magnetic density harmonic of stator core, thereby reduce motor back electromotive force harmonic, reduce the iron loss that the harmonic produced, further promote motor performance.

Fig. 4 shows a graph of the magnitude of each order of the back emf harmonic versus the back emf harmonic content for a motor according to the present invention versus a conventional motor. Wherein, "this patent scheme" in fig. 4 means that the motor employs the above stator core having the protruding portion 4 and the buffer groove 5, and that the size constraint is satisfied between the buffer groove 5 and the protruding portion 4: r1 > R2 > 0.8R1; while the "conventional scheme" in fig. 4 means that the stator core of the motor is a conventional stator core without the protrusions 4 and the buffer tank 5. As can be seen from fig. 4, after the motor adopts the stator core with the protruding portion 4 and the buffer slot 5, the amplitude of each order of the counter potential harmonic and the content of the counter potential harmonic are low.

In some embodiments, as shown in fig. 2, the minimum distance between each buffer slot 5 and the outer circumference of the stator core is D1, and the width of each buffer slot 5 along the radial direction of the stator core is L, where L > D1. The structure ensures that the width of the outer circle connecting rib 41 is not too small and the strength is insufficient, so that the reasonable size absorbs the stress of the interference fit of the stator core, thereby reducing the deformation; the cavity structure of the buffer groove 5 in the size matching can absorb the vibration energy generated by the motor, and reduce the vibration noise of the compressor.

In some embodiments, as shown in fig. 1 and 2, the width of each buffer slot 5 in the radial direction of the stator core is L, and the maximum width of the stator yoke 1 in the radial direction of the stator core is D2. Wherein D2 is > 5*L. The structure can further ensure the structural strength of the motor, the proper width of the buffer groove 5 in the radial direction can also ensure that the deformation amount of the stator thermal sleeve is smaller, and the buffer groove 5 penetrating through the stator core is formed in the stator core to provide a circulation channel for a refrigerant, so that the motor is cooled, and the operation efficiency of the motor is improved.

The stator core can be formed by axially laminating a plurality of layers of silicon steel sheets.

The present invention also provides a stator, which may include the stator core of any one of the above. The invention also provides a motor which can comprise the stator. The invention also provides a compressor which can comprise the motor. Because the compressor, the motor and the stator all adopt the stator core, the protruding parts 4 and the buffer grooves 5 are matched, the assembly deformation of the whole stator can basically only occur in each protruding part 4, and particularly, the assembly deformation of the whole stator can occur at the wall thickness between the outer wall of each protruding part 4 and the corresponding buffer groove 5, so that the deformation displacement of the stator yoke part 1 and the stator teeth 2 at the inner side of the stator can be reduced, the whole deformation of the stator is reduced when the stator is assembled in a hot-sleeved mode, and the noise, vibration and energy generated by vibration due to irregular deformation are reduced when the compressor is operated.

In addition, as the deformation of the stator during assembly basically occurs in each protruding part 4, the stator yoke part 1 and the stator teeth 2 basically do not deform at the inner side of the stator, so that the uniform air gap of the motor can be ensured, the magnetic flux density harmonic content of the air gap of the motor is reduced, and the excitation vibration of the motor due to the harmonic is reduced; meanwhile, the iron loss generated by harmonic waves can be reduced, and the running efficiency of the motor is further improved.

Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (12)

1. A stator core, characterized in that: the stator comprises a stator yoke part (1) which is annular, wherein a plurality of protruding parts (4) are arranged on the outer side wall of the stator yoke part (1), the protruding parts (4) are uniformly distributed circumferentially around the center of a stator core, and buffer grooves (5) penetrating through the two axial ends of the stator core are arranged in each protruding part (4);

wherein, stator core offsets with the inner wall of motor casing through each protruding portion (4), and the wall thickness between the outer wall of each protruding portion (4) and corresponding dashpot (5) can take place deformation.

2. The stator core as claimed in claim 1 wherein:

each buffer groove (5) is a symmetrical groove body, and the symmetrical surface of each buffer groove (5) passes through the center of the stator core.

3. The stator core as claimed in claim 2, wherein:

each buffer groove (5) is provided with a first buffer groove body (51) and a second buffer groove body (52) which are arranged at intervals and symmetrically;

the space between the first buffer groove body (51) and the second buffer groove body (52) in each buffer groove (5) is H, and the width of each buffer groove body along the radial direction of the stator core is L, wherein L is more than H.

4. A stator core according to any one of claims 1 to 3, characterized in that:

the stator core further comprises a plurality of stator teeth (2), wherein the plurality of stator teeth (2) are arranged on the inner wall of the stator yoke part (1) and are uniformly distributed circumferentially around the center of the stator core;

stator grooves (3) are formed between every two adjacent stator teeth (2), wherein the number of the protruding parts (4) is equal to that of the stator grooves (3) and corresponds to that of the stator grooves one by one; the outer side wall of each protruding part (4) is opposite to the bottom surface (31) of the corresponding stator groove (3).

5. The stator core as claimed in claim 4 wherein:

each stator groove (3) is a symmetrical groove body, and each protruding part (4) is symmetrical relative to the symmetrical plane of the corresponding stator groove (3).

6. The stator core according to any one of claims 1 to 3, 5, characterized in that:

in a section perpendicular to the axis of the stator core, for any protruding portion (4), there are opposite first and second ends in the circumferential direction of the stator core, a line connecting the first end and the center of the stator core is a first line segment (a 1), a line connecting the second end and the center of the stator core is a second line segment (a 2), and a buffer groove (5) in the protruding portion (4) is located between the first line segment (a 1) and the second line segment (a 2).

7. The stator core as claimed in claim 6 wherein:

in a section perpendicular to the axis of the stator core, for any one of the projections (4), the arc length between its opposite ends in the circumferential direction of the stator core is R1, and the arc length between its opposite ends in the circumferential direction of the stator core of the buffer groove (5) in the projection (4) is R2, wherein R1 > R2 > 0.8 x R1.

8. The stator core according to any one of claims 1 to 3, 5, characterized in that:

the minimum distance between each buffer groove (5) and the outer circle of the stator core is D1, and the width of each buffer groove (5) along the radial direction of the stator core is L, wherein L is more than D1.

9. The stator core according to any one of claims 1 to 3, 5, characterized in that:

the width of each buffer groove (5) along the radial direction of the stator core is L, and the maximum width of the stator yoke part (1) along the radial direction of the stator core is D2, wherein D2 is more than 5*L.

10. A stator, characterized in that: comprising a stator core according to any one of claims 1-9.

11. An electric motor, characterized in that: comprising a stator as claimed in claim 10.

12. A compressor, characterized in that: comprising an electrical machine as claimed in claim 11.