CN213602456U

CN213602456U - Stator punching sheet, stator core, permanent magnet synchronous motor, compressor and refrigeration equipment

Info

Publication number: CN213602456U
Application number: CN202022828134.6U
Authority: CN
Inventors: 徐飞; 邱小华; 江波
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-02
Anticipated expiration: 2030-11-30

Abstract

The utility model provides a stator is towards piece, stator core, PMSM, compressor and refrigeration plant, wherein, the stator is towards the piece including: the stator yoke is of an annular structure; a plurality of stator teeth provided on an inner ring of the stator yoke; the stator tooth includes: a tooth root connected with the stator yoke; a tooth portion connected with the tooth root; and the tooth shoe is connected with the tooth part, and the end surface of one side of the tooth shoe, which is far away from the tooth part, comprises a first tooth surface and a second tooth surface along the circumferential direction of the stator yoke, wherein the first tooth surface and the second tooth surface are recessed towards the direction of the tooth root by taking the symmetrical center line of the tooth part as the reference, one side of the symmetrical center line of the tooth part is the first tooth surface, and the other side of the symmetrical center line of the tooth part is the second tooth surface, and the maximum distance between the first tooth surface and the circle centers of the inscribed circles of the plurality of stator teeth is larger than the maximum distance between the second tooth surface and the circle centers of the. The radial electromagnetic force wave generated by the action of the armature magnetic field harmonic wave and the rotor magnetic field harmonic wave is reduced, and the vibration noise of the motor in the key frequency band is improved.

Description

Stator punching sheet, stator core, permanent magnet synchronous motor, compressor and refrigeration equipment

Technical Field

The utility model relates to a motor field particularly relates to a stator is towards piece, a stator core, a PMSM, a compressor and a refrigeration plant.

Background

In a rotary direct-current variable-frequency compressor adopting a motor in the related art, the motor generally adopts a built-in permanent magnet motor, and in recent years, along with the improvement of the power density of the motor, higher requirements are provided for the vibration noise of the motor, while the conventional motor cannot meet the requirement of silence more and more.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model discloses a first aspect provides a stator punching.

A second aspect of the present invention provides a stator core.

The third aspect of the utility model provides a permanent magnet synchronous motor.

A fourth aspect of the present invention provides a compressor.

A fifth aspect of the present invention provides a refrigeration apparatus.

In view of this, according to the utility model discloses an aspect, the utility model provides a stator punching sheet, include: the stator yoke is of an annular structure; a plurality of stator teeth provided on an inner ring of the stator yoke; the stator tooth includes: a tooth root connected with the stator yoke; a tooth portion connected with the tooth root; and the tooth shoe is connected with the tooth part, and the end surface of one side of the tooth shoe, which is far away from the tooth part, comprises a first tooth surface and a second tooth surface along the circumferential direction of the stator yoke, wherein the first tooth surface and the second tooth surface are recessed towards the direction of the tooth root by taking the symmetrical center line of the tooth part as the reference, one side of the symmetrical center line of the tooth part is the first tooth surface, and the other side of the symmetrical center line of the tooth part is the second tooth surface, and the maximum distance between the first tooth surface and the circle centers of the inscribed circles of the plurality of stator teeth is greater than the maximum distance between the second tooth surface and the circle centers of the inscribed.

The utility model provides a stator punching sheet, including stator yoke and stator tooth, the whole annular structure that is of stator yoke, a plurality of stator tooth equipartitions circle in the stator yoke, form the stator slot promptly between the stator tooth to in setting up the winding.

Specifically, the stator tooth includes tooth root, tooth portion and tooth boots, and the first end and the stator yoke of tooth root are connected, and the second end of tooth root is connected with the one end of tooth portion, and first end and second end are for the both ends of carrying on the back mutually, and the other end that carries on the back mutually with the tooth root of tooth portion is connected with the tooth boots.

The end face of one side of the tooth shoe, which faces away from the tooth part, comprises a first tooth face and a second tooth face along the peripheral side of the stator yoke, namely the end face of one side of the tooth shoe, which faces away from the tooth part, comprises the first tooth face and the second tooth face along the direction in which the rotor can rotate after the motor is assembled, and specifically, the first tooth face and the second tooth face are distributed along the clockwise direction or the anticlockwise direction.

And the first tooth surface and the second tooth surface are concave towards the direction of the tooth part, so that sufficient space is provided for the rotation of the rotor, the air gap between the stator punching sheet and the rotor is reduced, and the energy efficiency of the motor is ensured.

And the maximum distance between the first tooth surface and the center of the circle inscribed in the plurality of stator teeth is larger than the maximum distance between the second tooth surface and the center of the circle inscribed in the plurality of stator teeth. And further along the extension direction of the symmetrical center line of the tooth part, the recess depth of the first tooth surface is larger than that of the second tooth surface, and further when the stator yoke is used, a rotor is arranged in the inner ring of the stator yoke and rotates in the direction from the first tooth surface to the second tooth surface.

Additionally, according to the utility model provides an above-mentioned technical scheme's stator towards piece can also have following additional technical characteristic:

in the above technical solution, further, the first tooth surface and the second tooth surface are in smooth transition or have a stepped structure.

In the technical scheme, at least part of the first tooth surface and part of the second tooth surface are in the same plane or curved surface, so that the second tooth surface is provided with a point farthest from the center of a circle inscribed in the plurality of stator teeth.

The first tooth surface and the second tooth surface are of a stepped structure, so that the part with the larger air gap and the part with the smaller air gap are both longer in length, and the performance of the motor is improved.

In any of the above solutions, further, along the circumferential direction of the stator yoke, the first tooth surface includes at least one section of curved surface and/or at least one section of flat surface; and/or the second tooth surface comprises at least one section of curved surface and/or at least one section of flat surface along the circumferential direction of the stator yoke.

In the technical scheme, the first tooth surface is a section of curved surface, a plurality of sections of curved surfaces, a plane at one end, a plurality of sections of planes, and the combination of the curved surfaces and the planes along the circumferential direction of the stator yoke, and the first tooth surface can be selected in any structure according to the requirement.

The second tooth surface is a combination of a section of curved surface, a plurality of sections of curved surfaces, a plane at one end, a plurality of sections of planes, a curved surface and a plane along the circumferential direction of the stator yoke, and the second tooth surface can be selected in any structure according to the requirement.

In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the first tooth surface is an arc surface; and/or the second tooth surface is a circular arc surface along the circumferential direction of the stator yoke.

In this technical scheme, along the circumference of stator yoke, first flank of tooth is the arc surface, and then makes the undulation degree of first flank of tooth have the continuity to, the change of first flank of tooth is regular circular arc change, and then has guaranteed that the air gap width is a less gradual change state, perhaps unchangeable state, further guarantees that the air gap change in first flank of tooth department between stator punching sheet and the rotor is gentle, promotes the magnetic field force that the rotor received, reduces radial electromagnetic force ripples.

Along stator yoke's circumference, the second flank of tooth is the arc surface, and then makes the undulation degree of second flank of tooth have the continuity to, the change of second flank of tooth is the circular arc change of law, and then has guaranteed that the air gap width is a less gradual change state, perhaps unchangeable state, further guarantees that the air gap change in second flank of tooth department between stator punching and the rotor is gentle, promotes the magnetic field force that the rotor received, reduces radial electromagnetic force ripples.

In any of the above technical solutions, further, a ratio of an outer diameter of the stator yoke to a minimum inner diameter surrounded by end faces of the stator teeth is greater than or equal to 0.5 and less than or equal to 0.58.

In this embodiment, the ratio of the outer diameter of the stator yoke to the minimum inner diameter surrounded by the end faces of the stator teeth is greater than or equal to 0.5 and less than or equal to 0.58, so that the stator punching sheet is ensured to have enough winding space and enough space for arranging the rotor, the consumption of the stator punching sheet material is reduced, and the cost of the stator punching sheet is reduced.

According to the utility model discloses a second aspect, the utility model provides a stator core, include: at least one stator punching sheet that any one technical scheme provided as above provided.

The utility model provides a stator core, because of the stator towards the piece that proposes including any one of at least one above-mentioned technical scheme, consequently, have as above-mentioned any one technical scheme's the whole beneficial effect towards the piece that stator provided, no longer state one by one here.

In the above technical solution, further, the method further includes: at least one iron core towards the piece, iron core towards the piece and the stator is towards the axial of piece and is piled up along stator core.

In this technical scheme, stator core can also include at least one iron core towards the piece, and the structure is the unit different with the stator punching promptly, and iron core towards piece and stator punching pile up along stator core's axial, and then constitute whole stator core to satisfy the magnetic field effect to the rotor.

In any of the above technical solutions, further, magnetic conductance grooves are provided on a part of all the stator laminations and all the core laminations.

In this technical scheme, only part has the magnetic conductance recess in whole stator punching and whole iron core punching, and then on stator core, has the punching of two kinds of structures simultaneously, is favorable to improving the low frequency efficiency of motor, compromises and improves volume production manufacturability.

In any of the above technical solutions, further, along the axial direction of the stator core, the total height of all stator laminations and the part of all core laminations provided with the magnetic conductance grooves is L1; the total height of all stator laminations and the part of all core laminations which is not provided with the magnetic conductance grooves along the axial direction of the stator core is L2, wherein,

in this technical scheme, can obtain different motor vibration noise improvement effect with two kinds of towards the piece according to the equipment of different axial thickness, the towards the piece overall height that is provided with the magnetic conductance recess is big more, the noise improvement effect is better, the towards piece overall height that is not provided with the magnetic conductance recess is big more, the motor efficiency is high more, and then at the motor vibration noise improvement effect that is in different axial thickness

In time, the energy efficiency and the noise reduction effect of the motor can be considered.

According to the utility model discloses a third aspect, the utility model provides a permanent magnet synchronous motor, include: the stator core provided by any one of the technical schemes; and the rotor is rotatably arranged in the stator iron core.

The utility model provides a permanent magnet synchronous motor, because of including the stator core that proposes as above-mentioned arbitrary technical scheme, consequently, have the whole beneficial effect of the stator core that proposes as above-mentioned arbitrary technical scheme, no longer state one by one here.

In the above technical solution, further, the rotor rotates along the first tooth surface to the second tooth surface of the stator tooth of the stator lamination of the stator core.

In the technical scheme, the air gap at the first tooth surface is ensured to be larger, so that the effects of reducing the radial force on the rotor and reducing the noise are ensured.

In any of the above technical solutions, further, the inner diameter of the stator core is Di, the rated torque of the motor is T, and the unit volume torque of the rotor is TPV, where 5.18 × 10^-7≤T×Di^-3×TPV^-1≤1.17×10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3。

In the technical scheme, the inner diameter Di of the stator core, the rated torque T of the motor and the unit volume torque of the rotor are TPV and meet the following requirements: 5.18X 10^-7≤T×Di^-3×TPV^-1≤1.17×10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3And then the value range of the combined variable of the rated torque T of the motor, the inner diameter Di of the stator core and the unit volume torque TPV of the rotor is limited, so that the motor can meet the power requirement of a high-strength environment, for example: a compressor.

In addition, the structure can effectively reduce the magnetic leakage of the rotor, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.

In any of the above technical solutions, further, stator slots are formed between adjacent stator teeth of the stator core, and a ratio of the number of the stator slots to 2 times of the number of pole pairs of the rotor is any of:

and

in the technical scheme, the pole slot matching of the motor is further limited by limiting the proportional relation between the number Z of the stator slots and the number P of the pole pairs of the rotor, and Z and 2 multiplied by P meet the requirement

Or

In time, the armature iron loss can be effectively reduced, the magnetic flux is improved, and the motor efficiency is further improved.

According to the utility model discloses a fourth aspect, the utility model provides a compressor, include: the stator core provided by any one of the technical schemes; or a permanent magnet synchronous motor as proposed in any of the above technical solutions.

The utility model provides a compressor, because of including the stator core that proposes as above-mentioned any technical scheme or the motor that proposes as above-mentioned any technical scheme, consequently, have as above-mentioned any technical scheme proposed stator core and as above-mentioned any technical scheme proposed permanent magnet synchronous motor's whole beneficial effect, no longer state one by one here.

According to the utility model discloses a fifth aspect, the utility model provides a refrigeration plant, include: the permanent magnet synchronous motor stator core provided by any one of the technical schemes; or the permanent magnet synchronous motor provided by any technical scheme; or a compressor as proposed in any of the above solutions.

The utility model provides a refrigeration plant, because of including the stator core that proposes as above-mentioned any technical scheme or the PMSM that proposes as above-mentioned any technical scheme or the compressor that proposes as above-mentioned any technical scheme, consequently, have as above-mentioned any technical scheme proposed stator core and as above-mentioned any technical scheme proposed PMSM and as above-mentioned any technical scheme proposed compressor's whole beneficial effect, no longer state one by one here.

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

Drawings

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

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

fig. 2 is a schematic structural diagram of a stator punching sheet according to an embodiment of the present invention;

fig. 3 shows a partial enlarged view of the stator lamination shown in fig. 2 at a;

fig. 4 is a schematic structural diagram of stator teeth in a stator lamination according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a stator punching sheet according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an iron core punching sheet having a magnetic conductance groove according to an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a compressor according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

100 stator laminations, 110 stator yoke, 120 stator teeth, 122 tooth roots, 124 tooth portions, 126 tooth shoes, 1262 first tooth faces, 1264 second tooth faces, 130 first region, 140 second region, 150 stator slots, 160 magnetically permeable grooves, 200 compressor, 210 rotor, 220 crankshaft, 230 first bearing, 240 second bearing, 250 cylinder, 260 piston.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The following describes a stator punching sheet 100, a stator core, a permanent magnet synchronous motor, a compressor 200 and a refrigeration device provided according to some embodiments of the present invention with reference to fig. 1 to 7.

Example 1:

as shown in fig. 1 to 5, the utility model provides a stator punching sheet 100, include: the stator comprises a stator yoke 110 and a plurality of stator teeth 120, wherein the stator yoke 110 is of an annular structure, the number of the stator teeth 120 is multiple, the plurality of stator teeth 120 are uniformly distributed on the inner ring of the stator yoke 110, a stator slot 150 is formed between every two adjacent stator teeth 120, a winding can be arranged in the stator slot 150, and the plurality of stator teeth 120 form a space around the stator slot to facilitate the arrangement of a rotor.

After the motor is assembled, the magnets on the rotor 210 are positioned in the magnetic field generated by the energization of the windings, and are further subjected to the magnetic force generated by the windings to rotate.

Further, the stator teeth 120 include a root 122, a tooth 124, and a tooth shoe 126, the root 122 being connected between the tooth 124 and the stator yoke 110, i.e., one end of the root 122 is connected to the stator yoke 110 and the opposite end of the root 122 is connected to the tooth, and the opposite end of the tooth is connected to the tooth shoe 126.

Specifically, after the motor is mounted, as shown in fig. 1 and 2, when the rotor rotates in the W direction, any point on the circumferential side of the rotor 210, which is located in the space surrounded by the stator laminations 100, passes through the first tooth surface 1262 first and then passes through the second tooth surface 1264.

The utility model provides a first flank 1262 and second flank 1264 are to the structure sunken to tooth 124, and then provide a similar convex circular shape space for rotor 210 to in rotor 210 rotatory back, rotor 210 and stator punching air gap between piece 100 are in a controllable position, avoid first flank 1262 and second flank 1264 protruding to lead to local air gap too big, and influence motor efficiency.

Further, the depth of the recess of the first tooth surface 1262 is greater than the depth of the recess of the second tooth surface 1264, so that when the rotor 210 passes through the first tooth surface 1262, the width of the air gap is increased, the increased width of the air gap increases the pressure drop of the magnetic circuit, the magnetic saturation at the position of the first tooth surface 1262 is reduced, the local saturation effect is reduced, the distortion of the air gap magnetic field is weakened, the even harmonic of the armature magnetic field is favorably inhibited, the radial electromagnetic force wave generated by the interaction of the armature magnetic field harmonic and the rotor 210 magnetic field harmonic is obviously reduced, the vibration noise of the key frequency band of the compressor 200 is improved, and the noise of the motor is reduced.

Specifically, of the first tooth surface 1262 and the second tooth surface 1264, the first tooth surface 1262 has a point farthest from the rotation center of the rotor 210.

As shown in fig. 5, in an embodiment of the present invention, a wire is led from the rotation center of the plurality of rotors 210 to the first tooth surface 1262 and the second tooth surface 1264, wherein L1, L2, L3 and L4 are leads from the rotation center of the rotors 210 to the first tooth surface 1262, and L5, L6 and L7 are leads from the rotation center of the rotors 210 to the first tooth surface 1262, wherein L1 is 28.6cm, L2 is 28.9543cm, L3 is 29.1901cm, L4 is 29.2020cm, L5 is 29.1382cm, L6 is 28.9179cm, and L7 is 28.600 cm. That is, the end of first tooth surface 1262 facing away from second tooth surface 1264 is equidistant from the center of rotation of rotor 210 and the end of second tooth surface 1264 facing away from first tooth surface 1262.

Specifically, as shown in fig. 1 and fig. 2, a base circle, that is, a curved line portion of a dotted line in fig. 1, fig. 2 and fig. 3, may be made in the stator lamination 100, where a center of the base circle is a center of an inscribed circle of the plurality of stator teeth 120, and a radius of the base circle is a minimum distance from the center of the inscribed circle of the plurality of stator teeth 120 to the second tooth surface 1264.

I.e. the base circle is identical to the inscribed circle of the plurality of stator teeth 120. And the center of rotation of the rotor is the center of the inscribed circle of the plurality of stator teeth 120.

Specifically, the radius of the base circle is a distance from a center of an inscribed circle of the plurality of stator teeth 120 to an end of the second tooth surface 1264 facing away from the first tooth surface 1262.

Further, the maximum distance between first tooth surface 1262 and the center of the circle inscribed in plurality of stator teeth 120 is greater than the maximum distance between second tooth surface 1264 and the center of the circle inscribed in plurality of stator teeth 120.

Specifically, the tooth 124 has a symmetrical structure, a straight line of a dotted line in fig. 2 and 3 is a symmetrical center line of the tooth 124, and the tooth 124 is symmetrical about the symmetrical center line of the tooth 124, wherein a region surrounded by the first tooth surface 1262, the symmetrical center line of the tooth 124, and a base circle is a first region 130, or a region surrounded by the first tooth surface 1262, the symmetrical center line of the tooth 124, the base circle, and a shortest connecting line of the first tooth surface 1262 and the base circle is the first region 130.

The area enclosed by the symmetrical center lines and the base circle of the second tooth surface 1264 and the tooth part 124 is the second area 140, and on the cross section perpendicular to the axis of the stator punching sheet 100, the area of the first area 130 is larger than that of the second area 140, so that the air gap magnetic density of the first area 130 is different from that of the second area 140, even harmonics can be reduced when the rotor 210 rotates, the influence of magnetic force superposition on the radial movement of the rotor 210 is reduced, the vibration noise of the key frequency band of the compressor 200 is improved, and the noise of the motor is reduced.

The recess of the first tooth surface 1262 is open in the axial direction of the stator yoke 110; the recess of the second tooth surface 1264 is open in the axial direction of the stator yoke 110.

Example 2:

as shown in fig. 3, in addition to embodiment 1, first tooth surface 1262 and second tooth surface 1264 are further in smooth transition.

In this embodiment, the first tooth surface 1262 and the second tooth surface 1264 have smooth transition, that is, two sides of the joint of the first tooth surface 1262 and the second tooth surface 1264 are located on the same curved surface or plane, so that a relatively flat and gradual air gap change is realized at the position of the symmetrical center line of the tooth 124, and thus, a part for increasing the air gap is limited on the second tooth surface, thereby reducing the noise of the motor or the compressor and improving the energy efficiency of the motor or the compressor.

As shown in fig. 4, in embodiment 1, the first tooth surface 1262 and the second tooth surface 1264 have a stepped structure.

In this embodiment, first tooth surface 1262 and second tooth surface 1264 are stepped, such that the portion with the larger air gap and the portion with the smaller air gap have longer lengths, thereby improving the performance of the motor.

Example 3:

as shown in fig. 1 to 3, in addition to embodiment 1 or embodiment 2, further, the first tooth surface 1262 may have any structure in the circumferential direction of the stator yoke 110.

The first tooth surface 1262 is a curved surface.

In this embodiment, the first tooth surface 1262 is a curved surface along the circumferential direction of the stator yoke 110, and the undulation degree of the first tooth surface 1262 has continuity, so that the width of the air gap between the first tooth surface 1262 and the rotor 210 is prevented from changing in a cliff manner, the change of the air gap between the stator punching sheet 100 and the rotor 210 at the first tooth surface 1262 is smooth, and the radial electromagnetic force wave is reduced.

First tooth surface 1262 is a flat surface.

In this embodiment, along the circumferential direction of the stator yoke 110, the first tooth surface 1262 is a plane, and the undulation degree of the first tooth surface 1262 has continuity, so that the width of the air gap between the first tooth surface 1262 and the rotor 210 is prevented from changing in a cliff manner, the change of the air gap between the stator punching sheet 100 and the rotor 210 at the first tooth surface 1262 is smooth, and the radial electromagnetic force wave is reduced.

The first tooth surface 1262 is a multi-segment curved surface.

In this embodiment, the first tooth surface 1262 is formed by joining a plurality of curved surfaces along the circumferential direction of the stator yoke 110.

The first tooth surface 1262 is a multi-segment plane.

In this embodiment, the first tooth surface 1262 is formed by joining a plurality of flat surfaces in the circumferential direction of the stator yoke 110.

The first tooth surface 1262 is a combination of a flat surface and a curved surface. Specifically, the number of the flat surfaces may be one or more, and the number of the curved surfaces may be one or more.

In this embodiment, the first tooth surface 1262 is a combination of a flat surface and a curved surface in the circumferential direction of the stator yoke 110.

As shown in fig. 1 to 3, further, the second tooth surface 1264 may have any structure along the circumferential direction of the stator yoke 110.

Second tooth surface 1264 is curved.

In this embodiment, the second tooth surface 1264 is a curved surface along the circumferential direction of the stator yoke 110, and the undulation degree of the second tooth surface 1264 has continuity, so that the change of the air gap width between the second tooth surface 1264 and the rotor 210 in a cliff type is avoided, the change of the air gap between the stator punching sheet 100 and the rotor 210 at the second tooth surface 1264 is smooth, and the radial electromagnetic force wave is reduced.

Second tooth surface 1264 is planar.

In this embodiment, the second tooth surface 1264 is a plane along the circumferential direction of the stator yoke 110, and the undulation degree of the second tooth surface 1264 has continuity, so that the change of the air gap width between the second tooth surface 1264 and the rotor 210 in a cliff type is avoided, the change of the air gap between the stator punching sheet 100 and the rotor 210 at the second tooth surface 1264 is smooth, and the radial electromagnetic force wave is reduced.

The second tooth surface 1264 is a multi-segment curved surface.

In this embodiment, the second tooth surface 1264 is formed by splicing a plurality of curved surfaces along the circumferential direction of the stator yoke 110.

The second tooth surface 1264 is a multi-segment planar surface.

In this embodiment, the second tooth surface 1264 is formed by joining a plurality of flat surfaces along the circumferential direction of the stator yoke 110.

The second tooth surface 1264 is a combination of a flat surface and a curved surface. Specifically, the number of the flat surfaces may be one or more, and the number of the curved surfaces may be one or more.

In this embodiment, the second tooth surface 1264 is a combination of a flat surface and a curved surface along the circumferential direction of the stator yoke 110.

Example 4:

as shown in fig. 1 to 3, in addition to any one of embodiments 1 to 3, the first tooth surface 1262 is an arc surface in the circumferential direction of the stator yoke 110.

In this embodiment, along the circumferential direction of the stator yoke 110, the first tooth surface 1262 is a circular arc surface, so that the undulation degree of the first tooth surface 1262 has continuity, and the change of the first tooth surface 1262 is a regular circular arc change, which further ensures that the change of the air gap between the stator punching sheet 100 and the rotor 210 at the first tooth surface 1262 is smooth, and reduces the radial electromagnetic force wave.

Example 5:

as shown in fig. 1 to 3, in addition to any one of embodiments 1 to 4, the second tooth surface 1264 is an arc surface in the circumferential direction of the stator yoke 110.

In this embodiment, the second tooth surface 1264 is an arc surface along the circumferential direction of the stator yoke 110, so that the undulation degree of the second tooth surface 1264 has continuity, and the change of the second tooth surface 1264 is a regular arc change, thereby further ensuring that the change of the air gap between the stator punching sheet 100 and the rotor 210 at the second tooth surface 1264 is smooth, and reducing the radial electromagnetic force wave.

Example 6:

in addition to embodiment 5, the first tooth surface 1262 and the second tooth surface 1264 are respectively a single end circular arc surface, and the radius of the first tooth surface 1262 is smaller than that of the second tooth surface 1264.

In this embodiment, the radius of first tooth surface 1262 is smaller than the radius of second tooth surface 1264, thereby making the curvature of first tooth surface 1262 larger and ensuring that the depth of concavity of first tooth surface 1262 is greater than the effect of second tooth surface 1264.

Further, the radius of the first tooth surface 1262 and the radius of the second tooth surface 1264 are both smaller than the minimum distance between the center of the circle inscribed in the plurality of stator teeth 120 and the stator teeth 120.

Further, the distance from the axial center of first tooth surface 1262 to the center of the circle inscribed in the plurality of stator teeth 120 is smaller than the distance from the axial center of second tooth surface 1264 to the center of the circle inscribed in the plurality of stator teeth 120.

Example 7:

in addition to any of embodiments 1 to 6, further, a vertical distance from an end of the first tooth surface 1262 facing away from the second tooth surface 1264 to a symmetric centerline of the tooth 124 is equal to a vertical distance from an end of the second tooth surface 1264 facing away from the first tooth surface 1262 to the symmetric centerline of the tooth 124.

In this embodiment, the vertical distance from the end of the first tooth surface 1262 away from the second tooth surface 1264 to the symmetric center line of the tooth 124 is equal to the vertical distance from the end of the second tooth surface 1264 away from the first tooth surface 1262 to the symmetric center line of the tooth 124, that is, if the recess depth of the first tooth surface 1262 and the second tooth surface 1264 is not calculated, the stator tooth 120 is of a symmetric structure, so that the time that the rotor 210 passes through the first tooth surface 1262 and the second tooth surface 1264 is ensured to be the same, the even harmonic of the armature magnetic field can be cut off in frequency, the effect of reducing the radial electromagnetic wave is improved, the vibration noise of the compressor 200 in the critical frequency band is improved, and the noise of the motor is reduced.

Example 8:

in addition to any one of embodiments 1 to 7, a ratio of an outer diameter of the stator yoke 110 to a minimum inner diameter surrounded by end faces of the stator teeth 120 is 0.5 or more and 0.58 or less.

That is, the ratio of the outer diameter of the stator lamination 100 to the inner diameter of the stator lamination 100 is greater than or equal to 0.5 and less than or equal to 0.58.

In this embodiment, the ratio of the outer diameter of the stator yoke 110 to the minimum inner diameter defined by the end faces of the stator teeth 120 is greater than or equal to 0.5 and less than or equal to 0.58, so that the stator lamination 100 has a sufficient winding space and a sufficient space for arranging the rotor 210, the material consumption of the stator lamination 100 is reduced, and the cost of the stator lamination 100 is reduced.

Example 9:

the utility model provides a stator core, include: at least one stator lamination 100 as provided in any of the embodiments.

The utility model provides a stator core, because of including at least one stator towards piece 100 as any embodiment provides, consequently, have as above-mentioned any technical scheme provides's whole beneficial effect towards piece 100, no longer state one by one here.

Specifically, the stator core includes a plurality of stator laminations 100, and the plurality of stator laminations 100 are stacked along an axial direction of the stator core.

Example 10:

on the basis of embodiment 9, further, the method further comprises: at least one iron core punching sheet, iron core punching sheet and stator punching sheet 100 pile up along stator core's axial.

In this embodiment, the stator core may further include core laminations of other structures, so as to provide more various changes for the magnetic field, thereby expanding the effect of the stator core.

Specifically, the core laminations and the stator laminations 100 may be stacked in any manner. For example: stacking iron core punching sheets at two ends of the stator punching sheet 100; stacking stator laminations 100 at both ends of the iron core laminations; stacking iron core laminations on one side of the stator laminations 100; stator laminations 100 and core laminations are stacked alternately.

Example 11:

as shown in fig. 6, in addition to embodiment 9 or embodiment 10, a flux guide groove 160 is further provided on a part of the stator lamination 100.

In this embodiment, only some of the stator laminations 100 in the stator core are provided with the magnetic conduction grooves 160, and further, the laminations having two structures are provided on the stator core, which is beneficial to improving the low-frequency energy efficiency of the motor and improving the mass production manufacturability.

Example 12:

as shown in fig. 6, in addition to embodiment 10, further, a flux guide groove 160 is provided on a part of the stator lamination 100; or the magnetic conduction grooves 160 are arranged on all the stator laminations 100.

In this embodiment, there is not magnetic conductance groove 160 on the iron core punching sheet in the stator core, all has magnetic conductance groove 160 on stator punching sheet 100, or some stator punching sheets 100 have magnetic conductance groove 160, and then on stator core, have the punching sheet of two kinds of structures simultaneously, be favorable to improving the low frequency efficiency of motor, compromise and improve volume production manufacturability.

Example 13:

as shown in fig. 6, in addition to embodiment 10, further, a magnetic conductance groove 160 is provided on a part of the core sheet; or all of the core segments may be provided with magnetically permeable grooves 160.

In this embodiment, there is not magnetic conductance groove 160 on stator punching 100 in the stator core, all has magnetic conductance groove 160 on the core punching, or some have the core punching have magnetic conductance groove 160, and then on stator core, have the punching of two kinds of structures simultaneously, be favorable to improving the low frequency efficiency of motor, compromise and improve the volume production manufacturability.

Example 14:

as shown in fig. 6, on the basis of embodiment 10, further, a magnetic conductance groove 160 is provided on a part of the core laminations and a part of the stator laminations 100; or only the magnetic conductance grooves 160 are arranged on all the iron core laminations and part of the stator laminations 100; or only the magnetic conduction grooves 160 are formed on part of the core laminations and all the stator laminations 100.

In the embodiment, the stator core is simultaneously provided with the punching sheets with two structures, so that the low-frequency energy efficiency of the motor is improved, and the mass production manufacturability is improved.

Example 15:

as shown in fig. 6, in addition to any one of embodiments 9 to 14, further, the total height of all the stator laminations 100 and the portion of all the core laminations provided with the flux guide grooves 160 in the axial direction of the stator core is L1; the total height of all the stator laminations 100 and the portion of all the core laminations not provided with the flux guide groove 160 in the axial direction of the stator core is L2, wherein,

in this embodiment, two types of punching sheets are assembled according to different axial thicknesses to obtain different motor vibration noise improvement effects, the larger the total height of the punching sheet provided with the magnetic conductance groove 160 is, the better the noise improvement effect is, the larger the total height of the punching sheet not provided with the magnetic conductance groove 160 is, the higher the motor energy efficiency is, and further, the motor vibration noise improvement effect is improved in the aspect that the total height of the punching sheet is larger

The energy efficiency and the noise reduction effect of the motor can be considered.

In particular, the amount of the solvent to be used,

equal to 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05 or 0.06.

Example 16:

the utility model provides a permanent magnet synchronous motor, include: a stator core as provided in any of the above embodiments; and a rotor 210 rotatably disposed within the stator core.

The utility model provides a permanent magnet synchronous motor, because of including the stator core as above-mentioned any embodiment provides, consequently, have the whole beneficial effect as above-mentioned any embodiment provides's stator core, no longer state one by one here.

Specifically, the motor includes a stator including a stator core provided as in any one of the above embodiments, and a winding provided to the stator core.

The rotor 210 includes a rotor core and a magnet disposed on the rotor core, and the winding generates a magnetic field after being energized, so as to push the rotor to rotate.

Example 17:

in addition to embodiment 16, the rotor 210 further rotates along the first tooth surface 1262 to the second tooth surface 1264 of the stator tooth 120 of the stator lamination 100 of the stator core.

In this embodiment, the rotor 210 is arranged to rotate along the first tooth surface 1262 to the second tooth surface 1264 of the stator teeth 120 of the stator lamination 100 of the stator core, so that it is ensured that when the rotor 210 passes the first tooth surface 1262 first, the width of the air gap is increased, and the increased air gap width increases the magnetic circuit voltage drop, so that the magnetic saturation at the first tooth surface 1262 is reduced, the local saturation effect is reduced, the distortion of the air gap magnetic field is weakened, the even harmonic of the armature magnetic field is favorably suppressed, the radial electromagnetic force wave generated by the interaction of the armature magnetic field harmonic and the rotor 210 magnetic field harmonic is remarkably reduced, the vibration noise of the compressor 200 in the key frequency band is improved, and the noise of the motor is reduced.

Example 18:

in example 16 or 17, the inner diameter of the stator core is Di, and the rated torque of the motor isT, the torque per unit volume of the rotor 210 is TPV, wherein 5.18 × 10^-7≤T ×Di^-3×TPV^-1≤1.17×10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3。

Specifically, the rated torque T of the motor is expressed in N · m, the inner diameter Di of the stator core is expressed in mm, and the unit volume torque TPV of the rotor 210 is expressed in kN · m ″^-3。

In this embodiment, the inner diameter Di of the stator core, the rated torque T of the motor, and the torque per unit volume of the rotor 210 are TPV, which satisfy: 5.18X 10^-7≤T×Di^-3×TPV^-1≤1.17×10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3And then, the value range of the combined variable of the rated torque T of the motor, the inner diameter Di of the stator core and the unit volume torque TPV of the rotor 210 is limited, so that the motor can meet the power requirement of a high-strength environment, for example: a compressor 200.

In addition, the structure can effectively reduce the magnetic leakage of the rotor 210, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.

Example 19:

on the basis of any one of embodiments 16 to 18, further, stator slots 150 are formed between adjacent stator teeth 120 of the stator core, and a ratio of the number of stator slots 150 to 2 times the number of pole pairs of the rotor 210 is any one of the following:

and

in this embodiment, Z and 2 × P satisfy by defining the proportional relationship between the number Z of stator slots 150 and the number P of pole pairs of the rotor 210, thereby defining the pole-slot matching of the motor

Or

Specifically, the motor may be a 6-pole 9-slot motor, a 4-pole 6-slot motor, an 8-pole 12-slot motor, or a 10-pole 12-slot motor.

Example 20:

as shown in fig. 7, the present invention provides a compressor 200, comprising: a stator core as provided in any of the above embodiments; or a permanent magnet synchronous machine as provided in any of the above embodiments.

The utility model provides a compressor 200, because include the stator core that any embodiment provided as above or the PMSM that any embodiment provided as above, consequently, have the stator core that any embodiment provided as above and the whole beneficial effect of the PMSM that any embodiment provided as above, no longer state one by one here.

Example 21:

as shown in fig. 7, in addition to embodiment 20, further, the compressor 200 further includes: a crankshaft 220 inserted through the rotor core of the rotor 210 and connected to the rotor core; and a power part connected with the crankshaft 220, the power part being configured to rotate following the rotor 210 to compress a medium.

Specifically, the power unit includes a piston 260 and a cylinder 250, which are disposed in the cylinder 250 and connected to the crankshaft 220, and a first bearing 230 and a second bearing 240 are disposed on the crankshaft 220, and the first bearing 230 and the second bearing 240 are respectively located at both ends of the power unit.

Example 22:

the utility model provides a refrigeration plant, include: a stator core as provided in any of the above embodiments; or a permanent magnet synchronous machine as provided in any of the above embodiments; or a compressor 200 as provided in any of the embodiments described above.

The utility model provides a refrigeration equipment, because include the stator core that any embodiment provided as above or the permanent magnet synchronous machine that any embodiment provided as above or the compressor 200 that any embodiment provided as above provided, consequently, have the stator core that any embodiment provided as above and the permanent magnet synchronous machine that any embodiment provided as above and the compressor 200 that any embodiment provided as above all beneficial effect, no statement here again.

Specifically, the refrigeration equipment further comprises a heat exchanger and a throttling element, and a heat exchange loop is formed by the heat exchanger, the throttling element and the compressor 200, and further the heat exchanger comprises a condenser and an evaporator.

The refrigeration apparatus includes: heat exchange equipment such as refrigerators, freezers, air conditioners and the like.

Example 23:

the utility model discloses an in the embodiment, a stator core is provided, is applied to PMSM, and specifically, the motor includes the stator, and the stator includes stator core, and stator core encloses the outside of locating rotor 210.

A plurality of stator teeth 120 are provided on a side of the stator core facing the rotor core, the plurality of stator teeth 120 being disposed along a circumferential side of the stator core, and a stator slot 150 is defined between adjacent stator teeth 120.

The stator also includes coils wound around the stator teeth 120 to form windings.

A base circle is defined by taking the center of rotation of the rotor 210, i.e., the axis of the stator core, as the center of the circle, and the center of rotation of the rotor 210, and a point on the farthest end of the stator teeth 120 in the direction of rotation of the rotor 210, as the radius. Stator tooth 120 is divided into first tooth surface 1262 and second tooth surface 1264 with reference to the symmetric center line of stator tooth 120, that is, the symmetric center line of tooth 124, wherein rotor 210 rotates from first tooth surface 1262 to second tooth surface 1264.

Specifically, the area of the portion surrounded by the portion of the first tooth surface 1262 facing the base circle, i.e., the first region 130, is not equal to the area of the portion surrounded by the portion of the second tooth surface 1264 facing the base circle, i.e., the second region 140.

At least one of the punching sheets of the stator core has the structural characteristics. By adopting the stator structure, the suppression of even harmonics of the armature magnetic field is facilitated, the radial electromagnetic force wave generated by the interaction of the armature magnetic field harmonics and the rotor 210 magnetic field harmonics is obviously reduced, the vibration noise of the compressor 200 in a key frequency band is further improved, and the hearing of the compressor 200 is effectively improved.

Further, the air gap side of the tooth shoe 126 on the side facing away from the tooth 124 is on the first tooth surface 1262 at the farthest point from the rotational center of the rotor 210 in the radial direction of the stator.

Specifically, the stator core includes a plurality of punching sheets, and the punching sheets are stacked along the axial direction of the stator, specifically, the punching sheets include the stator punching sheet 100 and the core punching sheet, and a magnetic conductance groove 160 is provided on some punching sheets. And then adopt two kinds of towards piece structures simultaneously and be favorable to improving the low frequency efficiency of motor, compromise and improve volume production manufacturability.

Further, the first tooth surface 1262 is located on the opposite side of the rotation direction of the rotor 210. The first tooth surface 1262 is disposed on the opposite side of the rotation direction of the rotor 210 to be more advantageous in improving vibration noise of the motor and the compressor 200.

Further, not being provided with the punching sheet of magnetic conductance recess 160, stacking height along the motor axial is L1, is provided with the punching sheet of magnetic conductance recess 160, and stacking height along the motor axial is L2, satisfies:

assemble two kinds of stator punching sheets 100 according to different axial thickness and can obtain different compressor 200 vibration noise improvement effects, the total height of the punching sheet that is provided with magnetic conductance recess 160 is big more, the noise improvement effect is better, the total height of the punching sheet that is not provided with magnetic conductance recess 160 is big more, the motor efficiency is high more, two kinds of punching sheets can be assembled according to actual need.

Furthermore, the stamped sheets provided with the magnetic conductance grooves 160 are clamped between the stamped sheets not provided with the magnetic conductance grooves 160; and/or the laminations not provided with the flux guide grooves 160 are sandwiched between laminations provided with flux guide grooves 160.

Example 24:

the utility model also provides a motor, include: a stator core as in any of the embodiments above is provided.

The utility model provides a motor, because of the stator core who provides including any above-mentioned embodiment, consequently have above-mentioned stator core's whole beneficial effect.

The motor includes: a stator including a stator core, the stator core being disposed around the rotor 210; one side of the multi-stator core facing the rotor core is provided with a plurality of stator teeth 120, the plurality of stator teeth 120 are arranged along the circumferential direction of the stator core, and a stator slot 150 is defined between the adjacent teeth; a coil wound around the stator teeth 120 to form a winding; wherein the number of stator slots 150 is Z, the number of pole pairs of the rotor 210 is P, and the ratio of Z to 2P is equal to

Or

In this embodiment, the stator includes a stator core, the stator core is provided with stator teeth 120, stator slots 150 are defined between adjacent stator teeth 120, coils are wound on the stator teeth 120, and the stator core is surrounded outside the rotor 210, wherein, a proportional relation between the number Z of the stator slots 150 and the number P of the pole pairs of the rotor 210 is defined, and further, the pole slot cooperation of the motor is defined, wherein, when the number P of the pole pairs of the rotor 210 is defined, then, the number of the poles of the rotor 210 is 2P, that is, the motor may be a 6-pole 9-slot motor, a 4-pole 6-slot motor, an 8-pole 12-slot motor, a 10-pole 12-slot motor, and the motor of the above type can effectively reduce armature iron loss, promote magnetic flux, and further promote motor.

Further, the inner diameter of the stator core is Di, the rated torque of the motor is T, the unit volume torque of the rotor 210 is TPV, and the following relation is satisfied: 5.18X 10^-7≤T×Di^-3×TPV^-1≤1.17× 10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3。

The unit of the rated torque T of the motor is N · m, the unit of the inner diameter Di of the stator core is mm, and the unit of the unit volume torque TPV of the rotor 210 is mIs kN.m.m^-3。

In this embodiment, the rated torque of the motor is T, the inner diameter of the stator core is Di, the torque per unit volume of the rotor 210 is TPV, and 5.18 × 10 is satisfied^-7≤T×Di^-3×TPV^-1≤1.17×10^-6The value range of the unit volume torque TPV is 5 kN.m.m^-3≤TPV≤45kN·m·m^-3The motor can meet the power requirement of the compressor 200 by limiting the value range of the combined variable of the rated torque T of the motor, the inner diameter Di of the stator core and the unit volume torque TPV of the rotor 210, and in addition, the motor adopting the rotor 210 and the compressor 200 can effectively reduce the magnetic leakage of the rotor 210, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.

Further, one side of the plurality of stator teeth 120 facing the rotor core surrounds an inner side wall of the stator core, and a ratio of a minimum diameter of the inner side wall of the stator core to a diameter of an outer side wall of the stator core is greater than 0.5 and less than or equal to 0.58.

In this embodiment, the ratio of the diameter of the inner side wall of the stator to the diameter of the outer side wall of the stator core is greater than 0.5 and less than or equal to 0.57, so that the motor has high cost performance.

Example 25:

the utility model also provides a compressor 200, include: a stator core as provided in any of the above embodiments; or a motor as provided in any of the embodiments above.

The compressor 200 of the present invention includes the stator core provided in any of the above embodiments; or a motor as provided in any of the above embodiments, and thus has all the benefits of a stator core or a motor.

Further, the compressor 200 further includes: a crankshaft 220 inserted through the rotor core of the rotor 210 and connected to the rotor core; and a power part connected with the crankshaft 220, and operatively configured to compress a medium and rotate with the motor.

In this embodiment, the compressor 200 further includes a crankshaft 220 and a power portion, the crankshaft 220 penetrates through the rotor core of the rotor 210, and the crankshaft 220 is connected to the rotor core and the power portion, so that when the motor works, the power portion can be driven to move, and then the medium is compressed, for example: and (4) a refrigerant.

Specifically, the crankshaft 220 of the compressor 200 is connected to the rotor core through a shaft hole of the rotor core.

Specifically, the compressor 200 further includes a main bearing and an auxiliary bearing, the power unit further includes a cylinder 250 and a piston 260, one end of the crankshaft 220 is inserted into the rotor 210, and the other end of the crankshaft sequentially passes through the main bearing, the cylinder 250 and the auxiliary bearing.

Example 26:

according to the utility model also provides a refrigeration plant, include: a stator core as provided in any of the above embodiments; or a motor as provided in any of the embodiments above; or a compressor 200 as provided in any of the embodiments described above.

The refrigeration equipment provided by the utility model comprises the stator core provided by any one of the above embodiments; or a motor as provided in any of the embodiments above; or the compressor 200 as provided in any of the above embodiments, and thus has all the benefits of the stator core or the motor or the compressor 200.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

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

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.

Claims

1. A stator punching sheet is characterized by comprising:

a stator yoke having an annular structure;

a plurality of stator teeth provided on an inner ring of the stator yoke;

the stator teeth include:

a tooth root connected with the stator yoke;

a tooth connected to the tooth root;

a tooth shoe connected to the tooth portion, wherein an end surface of the tooth shoe on a side facing away from the tooth portion in a circumferential direction of the stator yoke includes a first tooth surface and a second tooth surface, and the first tooth surface is provided on one side of a symmetrical center line of the tooth portion and the second tooth surface is provided on the other side of the symmetrical center line of the tooth portion on the basis of the symmetrical center line of the tooth portion,

the first tooth surface and the second tooth surface are concave towards the tooth root, and the maximum distance between the first tooth surface and the circle centers of the plurality of stator tooth inscribed circles is larger than the maximum distance between the second tooth surface and the circle centers of the plurality of stator tooth inscribed circles.

2. The stator lamination as recited in claim 1,

the first tooth surface and the second tooth surface are in smooth transition or in a step structure.

3. The stator lamination as recited in claim 1,

the first tooth surface comprises at least one section of curved surface and/or at least one section of plane surface along the circumferential direction of the stator yoke; and/or

The second tooth surface comprises at least one section of curved surface and/or at least one section of plane surface along the circumferential direction of the stator yoke.

4. The stator lamination as recited in any one of claims 1 to 3,

the ratio of the outer diameter of the stator yoke to the minimum inner diameter enclosed by the end faces of the stator teeth is greater than or equal to 0.5 and less than or equal to 0.58.

5. A stator core, comprising:

at least one stator lamination as claimed in any one of claims 1 to 4.

6. The stator core of claim 5, further comprising:

at least one iron core punching sheet, the iron core punching sheet with the stator punching sheet is followed stator core's axial is piled up.

7. The stator core according to claim 6,

and magnetic conduction grooves are formed in all the stator punching sheets and part of all the iron core punching sheets.

8. The stator core according to claim 7,

the total height of all the stator laminations and the part, provided with the magnetic conductance grooves, of all the iron core laminations along the axial direction of the stator iron core is L1;

the total height of all the stator laminations and the part of all the iron core laminations which is not provided with the magnetic conductance grooves along the axial direction of the stator iron core is L2,

wherein the content of the first and second substances,

9. a permanent magnet synchronous motor, comprising:

a stator core according to any one of claims 5 to 8;

a rotor rotatably disposed within the stator core.

10. The permanent magnet synchronous machine according to claim 9,

the rotor rotates along a first tooth surface to a second tooth surface of a stator tooth of a stator punching sheet of the stator core.

11. The permanent magnet synchronous machine according to claim 9 or 10,

the inner diameter of the stator core is Di, the rated torque of the motor is T, the unit volume torque of the rotor is TPV,

wherein, 5.18 is multiplied by 10^-7≤T×Di^-3×TPV^-1≤1.17×10^-6，5kN·m·m^-3≤TPV≤45kN·m·m^-3。

12. The permanent magnet synchronous machine according to claim 9 or 10,

stator slots are formed between adjacent stator teeth of the stator core, and the ratio of the number of the stator slots to 2 times of the pole pair number of the rotor is any one of the following:

and

13. a compressor, comprising:

a stator core according to any one of claims 5 to 8; or

A permanent magnet synchronous machine according to any of claims 9 to 12.

14. A refrigeration apparatus, comprising:

a stator core according to any one of claims 5 to 8; or

A permanent magnet synchronous machine according to any one of claims 9 to 12; or

The compressor of claim 13.