CN117411203A

CN117411203A - A motor and compressor

Info

Publication number: CN117411203A
Application number: CN202311521850.1A
Authority: CN
Inventors: 龚海涛
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2023-11-15
Filing date: 2023-11-15
Publication date: 2024-01-16
Anticipated expiration: 2043-11-15
Also published as: CN117411203B

Abstract

The invention provides a motor and a compressor, wherein the motor comprises a stator core and a rotor; the stator core comprises a stator yoke part and a plurality of stator teeth, wherein the plurality of stator teeth are arranged on the inner wall of the stator yoke part and are uniformly distributed circumferentially around the center of the stator core; one side of each stator tooth facing the center of the stator core encloses a stator inner hole; the stator core is sleeved on the rotor through the stator inner hole; the outer diameter of the stator yoke part is D1, the diameter of the stator inner hole is D2, D2/D1 is more than or equal to 0.6, and a gap L between the rotor and the hole wall of the stator inner hole meets the following conditions: l is more than or equal to 0.5 mm and less than or equal to 0.8 mm. According to the technical scheme of the invention, the stator core punching sheet is subjected to large-split-ratio design, and the outer diameter of the rotor can be increased by matching with reasonable air gap design, so that the rotor can be provided with larger-volume magnetic steel, the magnetic property of the magnetic steel is improved, and the efficiency of the motor is improved.

Description

Motor and compressor

Technical Field

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

Background

The existing permanent magnet synchronous reluctance motor has the following defects:

1. the price of the rare earth is high for a long time, the cost of the rare earth magnetic steel in the motor exceeds one third at present, the cost performance of the permanent magnet synchronous motor is restricted, and if ferrite magnetic steel is adopted to replace the rare earth magnetic steel, the cost can be reduced, but the efficiency of the motor can be reduced.

2. Most of stators of motors adopt a distributed winding process, the volume of winding end parts is larger, the cost of the motor is increased due to the increase of copper, and meanwhile, the end winding can generate loss, so that the motor efficiency is lowered.

3. Each pole on the rotor core is composed of two tile-shaped magnetic steels, for a large-split-ratio motor, the tile-shaped magnetic steels are difficult to realize deep V structure if the pole number is increased, so that the air gap magnetic density is limited to be further improved, meanwhile, the manufacturing tolerance of the tile-shaped magnetic steels is difficult to achieve the level of square magnetic steels, the assembly process is complex, the magnetic steels are poor in universality, the inner layer magnetic bridge is easy to be too high in magnetic density due to space limitation, and the magnetization orientation direction in the manufacturing process of the tile-shaped magnetic steels is difficult to achieve the ideal level, so that the motor efficiency is influenced.

Disclosure of Invention

Therefore, the invention provides a motor and a compressor, which mainly solve the technical problems that: how to improve the efficiency of the motor.

In order to solve the above-described problems, the present invention provides a motor including a stator core and a rotor;

the stator core comprises a stator yoke part and a plurality of stator teeth, wherein the plurality of stator teeth are arranged on the inner wall of the stator yoke part and are uniformly distributed circumferentially around the center of the stator core; one side of each stator tooth facing the center of the stator core encloses a stator inner hole; the stator core is sleeved on the rotor through the stator inner hole;

the outer diameter of the stator yoke part is D1, the diameter of the stator inner hole is D2, D2/D1 is more than or equal to 0.6, and a gap L between the rotor and the hole wall of the stator inner hole meets the following conditions: l is more than or equal to 0.5 mm and less than or equal to 0.8 mm.

In some embodiments, the rotor has a rotor core, on which a plurality of V-shaped magnetic steel grooves are provided, the plurality of V-shaped magnetic steel grooves being uniformly distributed circumferentially around the center of the rotor core;

the V-shaped magnetic steel grooves are respectively formed by two V-shaped groove bodies, namely a first groove body and a second groove body, and the first groove bodies and the corresponding second groove bodies are symmetrically arranged.

In some embodiments, the first slot body and the second slot body both have a first slot wall located on the inner side of the V-shape and a second slot wall opposite to the outer wall of the rotor core, each of the first slot wall and the corresponding second slot wall has a chamfer bevel therebetween, and an included angle θ3 between each of the chamfer bevels and the corresponding first slot wall satisfies: theta 3 is more than or equal to 30 degrees and less than or equal to 50 degrees.

In some embodiments, the angle θ between the first and second grooves satisfies: θ is less than or equal to 50 °.

In some embodiments, the first tank body and the second tank body are provided with magnetic steels, and the width Lm of each magnetic steel and the thickness Dm of each magnetic steel satisfy: dm/Lm is more than or equal to 0.15 and less than or equal to 0.25.

In some embodiments, the outer wall surface of the rotor core has first areas, the number of the first areas is equal to that of the V-shaped magnetic steel grooves, and the first areas are in one-to-one correspondence, and each first area is opposite to the V-shaped opening of the corresponding V-shaped magnetic steel groove;

wherein, each first region is equipped with the recess, each recess is in the both ends in the circumference of rotor core and the contained angle θ1 between the line at rotor core center satisfy: theta 1 is more than or equal to 45 degrees and less than or equal to 50 degrees.

In some embodiments, the rotor core is provided with a first magnetic beam trimming groove and a second magnetic beam trimming groove which are symmetrically arranged on an iron core part between two groove bodies of each V-shaped magnetic steel groove, and a space is reserved between each first magnetic beam trimming groove and each second magnetic beam trimming groove and the outer wall surface of the rotor core; forming a corresponding first region on the outer wall surface of each iron core part, wherein a groove on each first region is positioned between a first magnetic beam trimming groove and a second magnetic beam trimming groove on the corresponding iron core part;

wherein, contained angle θ2 between the line of the center of first magnetic beam arrangement groove and the center of second magnetic beam arrangement groove and rotor core satisfies: theta 1-theta 2 is more than or equal to 0 degree and less than or equal to 15 degrees.

In some embodiments, the intervals Lm between the first and second magnetic flux trimming grooves and the outer wall surface of the rotor core each satisfy: lm is more than or equal to 0.5 mm and less than or equal to 1 mm.

In some embodiments, each of the stator teeth has a coil wound thereon, each of the coils being a concentrated coil.

The invention also provides a compressor comprising the motor as claimed in any one of the above.

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

1. through limiting the outer diameter D1 of the stator yoke part and the diameter D2 of the stator inner hole to D2/D1 not less than 0.6, the punching sheet of the stator core is designed with a large crack ratio, and the air gap diameter (namely the diameter of the stator inner hole) can be increased as much as possible on the basis that the area of an enameled wire is ensured not to be extruded to cause the electric density of the enameled wire to be too high, so that the outer diameter of a rotor can be increased under the condition of ensuring a reasonable air gap L, the rotor can be provided with magnetic steel with larger volume, the magnetic property of the magnetic steel is improved, and the efficiency of a motor is improved.

2. By controlling the angle θ3 of the cut edge (i.e., the chamfer bevel), the radial electromagnetic force can be reduced, and the motor noise can be reduced.

3. Through setting the contained angle theta between first cell body and the second cell body to less than or equal to 50, make V-arrangement magnet steel groove be dark V-arrangement design, so can increase V-arrangement magnet steel groove's volume, be favorable to installing the magnet steel of bigger volume to improve the magnetic property of magnet steel, increase motor efficiency.

4. Through the wide-thick proportion of rational design magnet steel, the dark V-arrangement design of cooperation magnet steel can pack into bigger magnet steel of volume on the basis of guaranteeing rotor core intensity to improve the magnetism nature of magnet steel, increase motor efficiency.

5. Through the contained angle theta 1 of each recess on the reasonable setting each rotor core outer wall surface, can improve the d axle air gap and increase d axle magnetic resistance, reach the purpose that improves motor salient pole ratio and magnetic resistance torque utilization ratio, so be favorable to improving the efficiency of motor.

6. Through the contained angle of rational design first magnetic beam arrangement groove and second magnetic beam arrangement groove, in the rotor rotation in-process, can weaken the air gap field mutation degree, reduce stator and rotor air gap density low order radial force wave amplitude, reach the purpose of noise reduction.

7. Compared with the existing coil of the distributed coil, the concentrated coil can reduce the volume of the winding end, reduce the copper consumption and reduce the cost of the motor. In addition, the end winding with smaller volume can reduce loss, and is beneficial to improving the efficiency of the motor.

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 cross-sectional view of an electric motor of the present invention;

fig. 2 is a top view of a stator core of the motor of the present invention;

FIG. 3 is a cross-sectional view of the rotor of the motor of the present invention;

FIG. 4 is a graph showing a comparison of motor efficiency tests for a prior art motor and a motor of the present invention under 20HZ conditions;

fig. 5 shows a comparison of motor efficiency tests for a prior art motor and a motor of the present invention under 40HZ conditions.

The reference numerals are:

1. a stator core; 2. a rotor; 3. magnetic steel; 4. a coil; 11. a stator yoke; 12. stator teeth; 20. v-shaped magnetic steel groove; 21. a rotor core; 22. a first groove wall; 23. a second groove wall; 24. chamfering inclined planes; 25. an iron core part; 26. a first region; 101. a stator groove; 102. a stator inner bore; 201. a first tank body; 202. a second tank body; 203. a first magnetic beam finishing tank; 204. a second magnetic beam finishing tank; 205. a groove.

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.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. It should be understood, however, that the construction, proportion, and size of the drawings, in which the present invention is practiced, are all intended to be illustrative only, and not to limit the scope of the present invention, which should be defined by the appended claims. Any structural modification, proportional change or size adjustment should still fall within the scope of the disclosure without affecting the efficacy and achievement of the present invention. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

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 3 in combination, according to an embodiment of the present invention, there is provided an electric motor including a stator core 1 and a rotor 2. The stator core 1 includes a stator yoke 11 and a plurality of stator teeth 12. The plurality of stator teeth 12 are all disposed on the inner wall of the stator yoke 11 and are uniformly distributed circumferentially around the center of the stator core 1. One side of each stator tooth 12 facing the center of the stator core 1 encloses a stator inner hole 102. The stator core 1 is sleeved on the rotor 2 through the stator inner hole 102. Wherein the outer diameter of the stator yoke 11 is D1, and the diameter of the stator inner hole is D2, and D2/D1 is more than or equal to 0.6. The clearance L between the rotor 2 and the wall of the stator bore 102 satisfies: l is more than or equal to 0.5 mm and less than or equal to 0.8 mm.

In the above example, by limiting the outer diameter D1 of the stator yoke 11 and the diameter D2 of the stator inner hole 102 to D2/D1 not less than 0.6, the punched sheet of the stator core 1 is designed with a large split ratio, and the air gap diameter (i.e., the diameter of the stator inner hole) can be increased as much as possible on the basis of ensuring that the area of the enameled wire is not extruded to cause the electric density of the enameled wire to be too high, so that the outer diameter of the rotor 2 can be increased under the condition of ensuring a reasonable air gap L, and the rotor 2 can be provided with a larger volume of magnetic steel to improve the magnetic performance of the magnetic steel, thereby being beneficial to improving the efficiency of the motor. Experiments prove that by adopting the technical scheme, the unloaded air gap flux density average value of the non-rare earth motor can be increased from 0.26T to 0.35T, so that the electromagnetic torque is increased by more than 1.3 times, and the efficiency is improved.

When the ferrite magnetic steel is adopted to replace the rare earth magnetic steel, the ferrite magnetic steel with larger volume can make up the difference of magnetic properties between the ferrite magnetic steel and the rare earth magnetic steel, and the efficiency of the motor is ensured.

As shown in fig. 3, the rotor 2 has a rotor core 21, and a plurality of V-shaped magnetic steel grooves 20 are provided in the rotor core 21, and the plurality of V-shaped magnetic steel grooves 20 are uniformly distributed circumferentially around the center of the rotor core 21. The two V-shaped grooves of each V-shaped magnetic steel groove 20 are a first groove 201 and a second groove 202, and each first groove 201 and the corresponding second groove 202 are symmetrically arranged.

In the above example, by providing the magnetic steel grooves as V-shaped magnetic steel grooves 20, it is advantageous to mount a larger volume of magnetic steel 3, improving the magnetic performance of the magnetic steel 3.

As shown in fig. 3, the aforementioned first slot 201 and second slot 202 each have a first slot wall 22 located inside the V-shape and a second slot wall 23 opposite to the outer wall of the rotor core 21. Each first groove wall 22 and the corresponding second groove wall 23 are provided with a chamfer bevel 24. The included angle θ3 between each chamfer bevel 24 and the corresponding first groove wall 22 satisfies: theta 3 is more than or equal to 30 degrees and less than or equal to 50 degrees.

In the above example, the chamfer 24 may also be referred to as a cut edge, and by controlling the angle θ3 between the chamfer 24 and the corresponding first groove wall 22, the radial electromagnetic force may be reduced, and the motor noise may be reduced. Experiments show that by adopting the scheme of the chamfer bevel 24, the electromagnetic force of the tooth part during the operation of the motor can be reduced by more than 3 percent, thereby realizing the purpose of reducing electromagnetic noise.

Further, as shown in fig. 3, the included angle θ between the first slot 201 and the second slot 202 satisfies: θ is less than or equal to 50 °.

In the above example, the V-shaped magnetic steel groove 20 is designed to be deep V-shaped by setting the included angle θ between the first groove 201 and the second groove 202 to be equal to or smaller than 50, so that the volume of the V-shaped magnetic steel groove 20 can be increased, which is beneficial to installing a larger volume of magnetic steel 3, so as to improve the magnetic performance of the magnetic steel 3 and increase the motor efficiency.

In a specific application example, as shown in fig. 3, the magnetic steels 3 are installed in the first tank 201 and the second tank 202, and the width Lm of each magnetic steel 3 and the thickness Dm of each magnetic steel 3 satisfy: dm/Lm is more than or equal to 0.15 and less than or equal to 0.25.

In the above example, by reasonably designing the width-to-thickness ratio of the magnetic steel 3 and matching with the deep V-shaped design of the magnetic steel 3, a larger volume of the magnetic steel 3 can be installed on the basis of ensuring the strength of the rotor core 21, so as to improve the magnetic performance of the magnetic steel 3 and increase the motor efficiency.

The magnetic steel 3 is square magnetic steel, and has better processing manufacturability compared with arc magnetic steel, so that the processing and assembling process cost is reduced.

In a specific application example, the magnetic steel 3 may be a high-grade ferrite magnetic steel with a number of 9 series or more.

As shown in fig. 3, the outer wall surface of the rotor core 21 has first areas 26, and the number of the first areas 26 is equal to the number of the V-shaped magnetic steel grooves 20 and corresponds to one. Each first region 26 is opposite to the V-shaped opening of the corresponding V-shaped magnetic steel groove 20. Wherein, each first region 26 is provided with a groove 205, and an included angle θ1 between connecting lines of two ends of each groove 205 in the circumferential direction of the rotor core 21 and the center of the rotor core 21 satisfies: theta 1 is more than or equal to 45 degrees and less than or equal to 50 degrees.

In the above example, by reasonably setting the included angle θ1 of each groove 205, the d-axis air gap can be increased to increase the d-axis magnetic resistance, so as to achieve the purpose of improving the salient pole ratio and the magnetic resistance torque utilization rate of the motor, which is beneficial to improving the efficiency of the motor.

As shown in fig. 3, the rotor core 21 is provided with a first magnetic flux trimming groove 203 and a second magnetic flux trimming groove 204 which are symmetrically arranged on the core portion 25 between the two groove bodies of each V-shaped magnetic steel groove 20. Each of the first and second magnetic flux trimming grooves 203 and 204 has a space from the outer wall surface of the rotor core 21. The outer wall surface of each core portion 25 forms the aforementioned corresponding first region 26. The groove 205 on each first region 26 is located between the first magnetic flux trimming groove 203 and the second magnetic flux trimming groove 204 on the corresponding core portion 25. Wherein, the included angle θ2 between the connecting lines of the centers of the first magnetic flux trimming groove 203 and the second magnetic flux trimming groove 204 and the center of the rotor core 21 satisfies: theta 1-theta 2 is more than or equal to 0 degree and less than or equal to 15 degrees.

In the above example, by reasonably designing the included angle between the first magnetic beam trimming groove 203 and the second magnetic beam trimming groove 204, the mutation degree of the air gap magnetic field can be weakened in the rotation process of the rotor 2, the amplitude of the low-order radial force wave of the air gap magnetic density of the stator and the rotor can be reduced, and the purpose of reducing noise can be achieved.

In some embodiments, the foregoing intervals Lm between each of the first and second magnetic flux trimming grooves 203 and 204 and the outer wall surface of the rotor core 21 satisfy: lm is more than or equal to 0.5 mm and less than or equal to 1 mm.

In the above example, by limiting the interval Lm between each magnetic beam trimming groove and the outer wall surface of the rotor core 21 to between 0.5 mm and 1 mm, on the one hand, processing is facilitated so that each magnetic beam trimming groove does not penetrate the outer wall of the rotor core; on the other hand, the magnetic flux arrangement grooves are close enough to the outer wall surface of the rotor core 21, so that the amplitude of low-order radial force waves for reducing the air gap flux density of the stator and the rotor is enhanced, and the noise reduction effect is enhanced.

As shown in fig. 1, the coils 4 are wound around each of the stator teeth 12, and each of the coils 4 is a concentrated coil.

Compared with the existing coil of the distributed coil, the concentrated coil can reduce the volume of the winding end, reduce the copper consumption and reduce the cost of the motor. In addition, the end winding with smaller volume can reduce loss, and is beneficial to improving the efficiency of the motor.

In a specific application example, as shown in fig. 1 and 2, stator slots 101 are formed between the two adjacent stator teeth 12, the number of stator slots 101 may be 12, and the number of magnetic poles on the rotor 2 may be 8 or 10, etc. Wherein the number of the V-shaped magnetic steel grooves 20 on the rotor core 21 is equal to the number of the magnetic poles on the rotor 2. The stator core 1 may be formed by axially laminating a plurality of silicon steel sheets. The rotor core 21 is formed by laminating the rotor 2 punched sheets in the axial direction.

According to the invention, the 12-slot 8-pole concentrated winding stator is matched with the deep V-shaped rotor 2, so that copper loss is reduced, the utilization rate of the ferrite magnetic steel 3 is improved, and the motor efficiency is improved. For the rotor structure with the deep V-shaped design, the design of the magnetic steel V angle and the groove is carried out through specific parameters, so that the salient pole ratio of the motor is improved, and the motor efficiency is improved. The small magnetism isolating holes (namely the first magnetic beam trimming groove 203 and the second magnetic beam trimming groove 204) are respectively arranged on two sides of the groove 205 of the rotor 2, so that the abrupt change of radial electromagnetic force is reduced, and the noise of the motor is reduced.

Fig. 4 shows a comparison of motor efficiency tests for a prior art motor and a motor of the present invention under 20HZ conditions. Fig. 5 shows a comparison of motor efficiency tests for a prior art motor and a motor of the present invention under 40HZ conditions. The ordinate in both fig. 4 and fig. 5 is motor efficiency, the first row of the table in the abscissa in both is a higher order harmonic, and the second and third rows of the table in the abscissa are motor torque. Wherein, the motor in the prior art adopts a distributed coil, a tile-shaped magnetic steel design, a groove-free design, a magnetic beam-free finishing groove design and a trimming-free design, and the motor in the invention adopts a concentrated coil 4, a square magnetic steel 3 design, a groove 205 design, a magnetic beam-free finishing groove design and a trimming-free design. As can be seen from fig. 4 and 5, the efficiency of the motor of the present invention is significantly higher than that of the prior art.

The present invention also provides a compressor that may include a motor of any of the above. Because the compressor adopts the motor, the outer diameter D1 of the stator yoke 11 and the diameter D2 of the stator inner hole are limited to D2/D1 not less than 0.6, so that the punched sheet of the stator core 1 is designed with a large crack ratio, the air gap diameter (namely the diameter of the stator inner hole) can be increased as much as possible on the basis of ensuring that the area of an enameled wire is not extruded to cause the electric density of the enameled wire to be too high, the outer diameter of the rotor 2 can be increased under the condition of ensuring a reasonable air gap L, the rotor 2 can be provided with larger-volume magnetic steel, the magnetic property of the magnetic steel is improved, and the efficiency of the motor is 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

1. An electric motor, characterized in that: comprises a stator core (1) and a rotor (2);

the stator core (1) comprises a stator yoke (11) and a plurality of stator teeth (12), wherein the plurality of stator teeth (12) are arranged on the inner wall of the stator yoke (11) and are uniformly distributed around the circle center of the stator core (1) in a circumference manner; one side of each stator tooth (12) facing the center of the stator core (1) encloses a stator inner hole (102); the stator core (1) is sleeved on the rotor (2) through the stator inner hole (102);

the outer diameter of the stator yoke part (11) is D1, the diameter of the stator inner hole (102) is D2, D2/D1 is more than or equal to 0.6, and a gap L between the rotor (2) and the hole wall of the stator inner hole (102) meets the following conditions: l is more than or equal to 0.5 mm and less than or equal to 0.8 mm.

2. The electric machine of claim 1, wherein:

the rotor (2) is provided with a rotor core (21), a plurality of V-shaped magnetic steel grooves (20) are arranged on the rotor core (21), and the plurality of V-shaped magnetic steel grooves (20) are uniformly distributed circumferentially around the center of the rotor core (21);

the two V-shaped groove bodies of each V-shaped magnetic steel groove (20) are respectively a first groove body (201) and a second groove body (202), and each first groove body (201) and each corresponding second groove body (202) are symmetrically arranged.

3. The electric machine of claim 2, wherein:

both the first groove body (201) and the second groove body (202) are provided with a first groove wall (22) positioned on the inner side of the V shape and a second groove wall (23) opposite to the outer wall of the rotor core (21), a chamfer inclined surface (24) is arranged between each first groove wall (22) and the corresponding second groove wall (23), and an included angle theta 3 between each chamfer inclined surface (24) and the corresponding first groove wall (22) is as follows: theta 3 is more than or equal to 30 degrees and less than or equal to 50 degrees.

4. The electric machine of claim 2, wherein:

the included angle theta between the first groove body (201) and the second groove body (202) meets the following conditions: θ is less than or equal to 50 °.

5. The electric machine of claim 4, wherein:

magnetic steel (3) are arranged in the first groove body (201) and the second groove body (202), and the width Lm of each magnetic steel (3) and the thickness Dm of each magnetic steel (3) meet the following conditions: dm/Lm is more than or equal to 0.15 and less than or equal to 0.25.

6. The electric machine of claim 2, wherein:

the outer wall surface of the rotor core (21) is provided with first areas (26), the number of the first areas (26) is equal to that of the V-shaped magnetic steel grooves (20) and corresponds to that of the V-shaped magnetic steel grooves one by one, and each first area (26) is opposite to the V-shaped opening of the corresponding V-shaped magnetic steel groove (20);

wherein, each first region (26) is provided with a groove (205), and an included angle theta 1 between connecting lines of two ends of each groove (205) in the circumferential direction of the rotor core (21) and the center of the rotor core (21) satisfies: theta 1 is more than or equal to 45 degrees and less than or equal to 50 degrees.

7. The electric machine of claim 6, wherein:

the rotor core (21) is provided with a first magnetic beam trimming groove (203) and a second magnetic beam trimming groove (204) which are symmetrically arranged on an iron core part (25) between two groove bodies of each V-shaped magnetic steel groove (20), and a space is reserved between each first magnetic beam trimming groove (203) and each second magnetic beam trimming groove (204) and the outer wall surface of the rotor core (21); the outer wall surface of each iron core part (25) forms a corresponding first area (26), and a groove (205) on each first area (26) is positioned between a first magnetic beam trimming groove (203) and a second magnetic beam trimming groove (204) on the corresponding iron core part (25);

wherein, the contained angle theta 2 between the line of the center of the first magnetic beam arrangement groove (203) and the second magnetic beam arrangement groove (204) and the center of the rotor core (21) satisfies: theta 1-theta 2 is more than or equal to 0 degree and less than or equal to 15 degrees.

8. The electric machine of claim 7, wherein:

the intervals Lm between the first and second magnetic flux trimming grooves (203, 204) and the outer wall surface of the rotor core (21) satisfy: lm is more than or equal to 0.5 mm and less than or equal to 1 mm.

9. The electric machine of any one of claims 1 to 8, wherein:

the stator teeth (12) are wound with coils (4), and each coil (4) is a concentrated coil.

10. A compressor, characterized in that: comprising the electrical machine of any one of claims 1-9.