CN112564318A

CN112564318A - Stator punching sheet, stator core, motor, compressor and refrigeration equipment

Info

Publication number: CN112564318A
Application number: CN202011381216.9A
Authority: CN
Inventors: 邱小华; 徐飞; 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: 2021-03-26
Anticipated expiration: 2040-11-30
Also published as: CN112564318B

Abstract

The invention provides a stator punching sheet, a stator iron core, a motor, a compressor and refrigeration equipment, wherein the stator punching sheet comprises: 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; the tooth crown is connected with the tooth root, the end surface of the tooth crown, which is far away from the tooth root, comprises a first tooth surface and a second tooth surface along the circumferential direction of the stator yoke, one end of the first tooth surface, which is far away from the second tooth surface, is a first end, and one end of the second tooth surface, which is far away from the first tooth surface, is a second end; and the distance between the first tooth surface and the circle center of the inscribed circle of the plurality of stator teeth is gradually smaller along the direction from the first end to the second end. According to the stator punching sheet provided by the invention, the distance between the first tooth surface and the circle center of the inscribed circle of the plurality of stator teeth is gradually smaller, so that the magnetic saturation of the first ends of the stator teeth is greatly reduced, the distortion of an air gap magnetic field is further reduced, the harmonic content of a motor is reduced, and the fluctuation of torque is reduced.

Description

Stator punching sheet, stator core, motor, compressor and refrigeration equipment

Technical Field

The invention relates to the field of motors, in particular to a stator punching sheet, a stator core, a motor, a compressor and a refrigerating device.

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.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

Therefore, the invention provides a stator punching sheet in a first aspect.

A second aspect of the invention proposes a stator core.

A third aspect of the invention provides an electric machine.

A fourth aspect of the present invention provides a compressor.

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

In view of the above, according to a first aspect of the present invention, the present invention provides a stator punching sheet, 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; the tooth crown is connected with the tooth root, the end surface of the tooth crown, which is far away from the tooth root, comprises a first tooth surface and a second tooth surface along the circumferential direction of the stator yoke, one end of the first tooth surface, which is far away from the second tooth surface, is a first end, and one end of the second tooth surface, which is far away from the first tooth surface, is a second end; and the distance between the first tooth surface and the center of an inscribed circle of the plurality of stator teeth is gradually reduced along the direction from the first end to the second end.

The stator punching sheet provided by the invention comprises a stator yoke and stator teeth, wherein the stator yoke is integrally in an annular structure, and a plurality of stator teeth are uniformly distributed on an inner ring of the stator yoke, namely, stator slots are formed among the stator teeth so as to be convenient for arranging windings.

Specifically, the stator tooth includes tooth root and crown, and the first end and the stator yoke of tooth root are connected, and the second end and the crown of tooth root are connected, and first end and second end are for the both ends that carry on the back mutually.

Wherein, along stator yoke's week side, including first flank and second flank on the terminal surface of the one side that the crown deviates from the tooth root, promptly after assembling into the motor, along the direction that the rotor can rotate, include first flank and second flank on the terminal surface of the one side that the crown deviates from the tooth root, specifically, first flank and second flank distribute along clockwise or anticlockwise.

And the rotor is arranged in the inner ring of the stator yoke, the rotation direction of the rotor is the direction from the first end to the second end, and the distance between the first tooth surface and the circle center of the inscribed circle of the plurality of stator teeth is gradually reduced along the direction from the first end to the second end, so that when the rotor rotates into the stator teeth, the initially-entering air gap is increased, the magnetic circuit pressure drop on the air gap side can be increased by the increase of the air gap, the magnetic saturation of the first end of the stator teeth is greatly reduced, the distortion of an air gap magnetic field is reduced, the harmonic content of the motor is reduced, and the fluctuation of torque is reduced.

In addition, the air gap is gradually reduced when the rotor rotates, namely, the magnetic saturation is gradually improved, so that the increase of radial force caused by the change of the cliff type air gap is avoided, the motor is ensured to have sufficient output power, and the noise of the motor is reduced.

In addition, according to the stator punching sheet in the above technical scheme provided by the invention, the following additional technical features can be provided:

in the above technical solution, further, along the direction from the second end to the first end, the distance between the second tooth surface and the center of the inscribed circle of the plurality of stator teeth gradually increases first, and then gradually decreases.

In this technical scheme, along the direction of second end to first end, the distance between the centre of a circle of the inscription circle of second flank of tooth and a plurality of stator teeth crescent, along the direction of first end to second end promptly, the direction of rotor pivoted, the distance between the centre of a circle of the inscription circle of second flank of tooth and a plurality of stator teeth is crescent earlier, reduce gradually again, and then at the in-process of rotor roll-out second flank of tooth, the air gap at second flank of tooth department is crescent earlier, the condition that reduces gradually afterwards, thereby in the part of air gap crescent, reduce the radial force that the rotor received, at the part that reduces gradually, promote the magnetic circuit pressure drop of air gap side, and then promote the magnetic saturation of stator tooth second flank of tooth, promote motor efficiency.

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 this aspect, the first tooth surface may include one or more curved surfaces, one or more flat surfaces, or a combination of one or more curved surfaces and one or more flat surfaces along the circumferential direction of the stator yoke.

The second tooth surface may include one or more curved surfaces, one or more flat surfaces, or a combination of one or more curved surfaces and one or more flat surfaces along a circumferential direction of the stator yoke.

In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the first tooth surface is an arc surface; 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, further guarantees that the air gap change in first 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.

Along the circumference of stator yoke, 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, and the air gap change in second flank of tooth department between further assurance stator punching sheet 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 stepped structure is formed between the first tooth surface and the second tooth surface.

In this technical scheme, be stair structure through setting up first flank of tooth and second flank of tooth, and then make first flank of tooth keep away from the centre of a circle of the inscribed circle of a plurality of stator teeth, and then when the rotor turned to the second flank of tooth by first flank of tooth, the air gap meeting abrupt change in ladder department, and then promoted the magnetic saturation of this department to promote the magnetic force to the rotor, promote motor efficiency.

In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the angle of the center of the circle occupied by the first tooth surface is smaller than the angle of the center of the circle occupied by the second tooth surface.

In the technical scheme, the angle of the circle center occupied by the first tooth surface is smaller than that occupied by the second tooth surface, so that the stator teeth face to the whole end face of the rotor, the magnetic saturation of the first tooth surface is reduced, the second tooth surface is guaranteed to have more parts with good air gap magnetic density, the magnetic force on the rotor is guaranteed, and the output power of the motor is guaranteed while the fluctuation of torque is reduced.

In any of the above technical solutions, further, a ratio of an outer diameter of the stator yoke to a minimum inner diameter formed between end faces of the plurality of 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 minimum inner diameter formed between the outer diameter of the stator yoke and the end faces of the plurality of 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 an enough winding space and an 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 a second aspect of the present invention, there is provided a stator core comprising: at least one stator punching sheet that any one technical scheme provided as above provided.

The stator core provided by the invention comprises at least one stator punching sheet provided by any one of the technical schemes, so that all the beneficial effects of the stator punching sheet provided by any one of the technical schemes are achieved, and the stator core is not stated one by one.

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 the 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 a third aspect of the invention, the invention proposes an electrical machine comprising: the stator core provided by any one of the technical schemes; and the rotor is rotatably arranged in the stator iron core.

The motor provided by the invention comprises the stator core provided by any one of the above technical solutions, so that all the beneficial effects of the stator core provided by any one of the above technical solutions are achieved, and the description is omitted.

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

In the technical scheme, the air gap at the first end is ensured to be larger, and the air gap at the first tooth surface is gradually reduced, 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^-3The unit of the inner diameter Di of the stator core is mm, the unit of the rated torque T of the motor is N.m, and the unit of the unit volume torque TPV of the rotor is kN.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 a fourth aspect of the present invention, there is provided a compressor comprising: the stator core provided by any one of the technical schemes; or a motor as proposed in any of the above-mentioned solutions.

The compressor provided by the present invention includes the stator core proposed by any one of the above technical solutions or the motor proposed by any one of the above technical solutions, and therefore, all the advantages of the stator core proposed by any one of the above technical solutions and the motor proposed by any one of the above technical solutions are achieved, and are not further recited herein.

According to a fifth aspect of the present invention, there is provided a refrigeration apparatus comprising: the stator core provided by any one of the technical schemes; or the motor provided by any one of the above technical schemes; or a compressor as proposed in any of the above solutions.

The refrigeration equipment provided by the invention comprises the stator core provided by any one of the above technical solutions or the motor provided by any one of the above technical solutions or the compressor provided by any one of the above technical solutions, so that all the advantages of the stator core provided by any one of the above technical solutions, the motor provided by any one of the above technical solutions and the compressor provided by any one of the above technical solutions are achieved, and the description is omitted.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, 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 lamination 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 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 4 is:

100 stator laminations, 110 stator yoke, 120 stator teeth, 122 tooth root, 124 tooth crown, 126 first tooth face, 128 second tooth face, 130 first end, 140 second end, 150 stator slot, 200 compressor, 210 rotor, 220 crankshaft, 230 first bearing, 240 second bearing, 250 cylinder, 260 piston.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. 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.

A stator punching sheet 100, a stator core, a motor, a compressor 200, and a refrigeration apparatus according to some embodiments of the present invention are described below with reference to fig. 1 to 4.

Example 1:

as shown in fig. 1 to 3, the present invention provides a stator punching sheet 100, including: the stator structure 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 the rotor 210.

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 and a crown 124, the root 122 is connected between the crown 124 and the stator yoke 110, i.e., one end of the root 122 is connected to the stator yoke 110 and the crown 124 is connected to the opposite end of the stator yoke 110.

Specifically, after the motor is mounted, as shown in fig. 1 and 2, when the rotor 210 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, will pass through the first tooth face 126 first and then the second tooth face 128, where a first end 130 of the first tooth face 126 facing away from the second tooth face 128 is a first end 140, and an end of the second tooth face 128 facing away from the first tooth face 126 is a second end 140.

And along the direction from the first end 130 to the second end 140, the distance between the first tooth surface 126 and the center of the inscribed circle of the plurality of stator teeth 120 is gradually reduced, so that when the rotor 210 rotates into the stator teeth 120, the initially entered air gap is increased, the increase of the air gap can increase the magnetic circuit pressure drop on the air gap side, further, the magnetic saturation of the first end 130 of the stator teeth 120 is greatly reduced, further, the distortion of the air gap magnetic field is reduced, the harmonic content of the motor is reduced, and the fluctuation of the torque is reduced.

Moreover, the air gap is gradually reduced when the rotor 210 rotates, that is, the magnetic saturation is gradually increased, so that the increase of radial force caused by the change of the cliff-type air gap is avoided, the motor is ensured to have sufficient output power, and the noise of the motor is reduced.

Specifically, as shown in fig. 1 and fig. 2, a base circle, that is, a curved portion of a dotted line in fig. 1, may be made in the stator lamination 100, wherein 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 an axis of the stator yoke 110 to the second tooth surface 128.

Specifically, the radius of the base circle is the distance from the axial center of the stator yoke 110 to the second end 140 of the second tooth face 128 facing away from the first tooth face 126.

Further, the distance between the direction from the first end 130 to the second tooth surface 128 of the first tooth surface 126 and the base circle is greatly reduced.

Further, by adopting the structure of the stator punching sheet 100, the even harmonic of the armature magnetic field can be inhibited, the radial electromagnetic wave generated by the interaction of the armature magnetic field harmonic and the rotor 210 magnetic field harmonic can be obviously reduced, the vibration noise of the compressor 200 in the key frequency band can be improved, and the hearing of the compressor 200 can be effectively improved.

Example 2:

as shown in fig. 1 to 3, in embodiment 1, further, in a direction from the second end 140 to the first end 130, a distance between the second tooth surface 128 and a center of an inscribed circle of the plurality of stator teeth 120 gradually increases and then gradually decreases.

That is, the distance between the direction from the second end 140 to the first tooth surface 126 and the base circle of the second tooth surface 128 increases and then gradually decreases.

In this embodiment, along the direction from the second end 140 to the first end 130, the distance between the second tooth surface 128 and the center of the inscribed circle of the plurality of stator teeth 120 gradually increases and then gradually decreases, that is, along the direction from the first end 130 to the second end 140, the distance between the second tooth surface 128 and the rotation axis of the rotor 210 gradually increases and then gradually decreases in the rotation direction of the rotor 210, and further, in the process that the rotor 210 rotates out of the second tooth surface 128, at least one section of air gap at the second tooth surface 128 gradually decreases to increase the magnetic circuit pressure drop at the air gap side, thereby increasing the magnetic saturation of the second tooth surface 128 of the stator teeth 120, increasing the motor efficiency, and, at the gradually increasing air gap portion, decreasing the radial force applied to the rotor, and reducing the noise of the ground motor or the compressor.

Example 3:

as shown in fig. 1 to 3, in addition to embodiment 1 or embodiment 2, further, in the circumferential direction of the stator yoke 110, the first tooth surface 126 includes at least one curved surface and/or at least one flat surface.

In this embodiment, the first tooth surface 126 may include a curved surface along the circumferential direction of the stator yoke 110.

The first tooth surface 126 may include a multi-sectional curved surface along the circumferential direction of the stator yoke 110.

The first tooth surface 126 may include a curved surface and a flat surface along the circumferential direction of the stator yoke 110.

The first tooth surface 126 may include a plurality of curved surfaces and a flat surface along the circumferential direction of the stator yoke 110.

The first tooth face 126 may include a multi-segment curved surface and a multi-segment flat surface along the circumferential direction of the stator yoke 110.

The first tooth surface 126 may include 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, further, in the circumferential direction of the stator yoke 110, the second tooth surface 128 includes at least one curved surface and/or at least one flat surface.

In this embodiment, the second tooth face 128 may include a curved surface along the circumferential direction of the stator yoke 110.

The second tooth face 128 may include a multi-sectional curved surface along the circumferential direction of the stator yoke 110.

The second tooth face 128 may include a curved surface and a flat surface along the circumferential direction of the stator yoke 110.

The second tooth face 128 may include a plurality of curved surfaces and a flat surface along the circumferential direction of the stator yoke 110.

The second tooth face 128 may include a multi-segment curved surface and a multi-segment flat surface along the circumferential direction of the stator yoke 110.

The second tooth face 128 may include a curved surface along the circumferential direction of the stator yoke 110.

Example 5:

as shown in fig. 1 to 3, in addition to any one of embodiments 1 to 4, the first tooth surface 126 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 126 is an arc surface, so that the undulation degree of the first tooth surface 126 has continuity, and the change of the first tooth surface 126 is a regular arc change, so that it is ensured that the air gap width is in a smaller gradual change state or a constant state, further ensuring that the air gap between the stator lamination 100 and the rotor 210 at the first tooth surface 126 changes smoothly, increasing the magnetic field force applied to the rotor 210, and reducing the radial electromagnetic force wave.

Example 6:

as shown in fig. 1 to 3, in addition to any one of embodiments 1 to 5, the second tooth surface 128 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 second tooth surface 128 is an arc surface, so that the undulation degree of the second tooth surface 128 has continuity, and the change of the second tooth surface 128 is a regular arc change, so that it is ensured that the air gap width is in a smaller gradual change state or a constant state, further ensuring that the air gap between the stator lamination 100 and the rotor 210 at the second tooth surface 128 changes smoothly, increasing the magnetic field force applied to the rotor 210, and reducing the radial electromagnetic force wave.

Example 7:

as shown in fig. 1 to 3, in addition to any one of embodiments 1 to 6, further, a stepped structure is formed between the first tooth face 126 and the second tooth face 128, and the first tooth face 126 is depressed toward the root 122 side.

In this embodiment, the first tooth surface 126 and the second tooth surface 128 are arranged in a stepped structure, so that the first tooth surface 126 is far away from the center of an inscribed circle of the plurality of stator teeth 120, and when the rotor 210 is turned from the first tooth surface 126 to the second tooth surface 128, an air gap at the step is suddenly changed, so that magnetic saturation at the position is improved, and thus the magnetic force on the rotor 210 is improved, and the motor efficiency is improved.

Example 8:

in addition to any one of embodiments 1 to 7, further, in the circumferential direction of the stator yoke 110, the angle of the center of the circle occupied by the first tooth surface 126 is smaller than the angle of the center of the circle occupied by the second tooth surface 128.

In this embodiment, the angle of the center of the circle occupied by the first tooth surface 126 is smaller than the angle of the center of the circle occupied by the second tooth surface 128, so that the stator teeth 120 face the whole end surface of the rotor 210, thereby reducing the magnetic saturation at the first tooth surface 126, ensuring that there are more parts with good air gap magnetic density at the second tooth surface 128, further ensuring the magnetic force on the rotor 210, and thus reducing the torque fluctuation and ensuring the output power of the motor.

Specifically, the root 122 is of a symmetrical configuration, the dashed line in FIG. 1 being the centerline of the root 122, the root 122 being symmetrical about the centerline of the root 122, wherein the first flank 126 is located between the centerline of the root 122 and the first end 130, and the second flank 128 crosses the centerline of the root 122.

Example 9:

in addition to any one of embodiments 1 to 8, 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 10:

the present invention provides a stator core, including: at least one stator lamination 100 as provided in any of the embodiments.

The stator core provided by the invention comprises at least one stator punching sheet 100 provided in any embodiment, so that all the beneficial effects of the stator punching sheet 100 provided by any technical scheme are achieved, and no description is given 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 11:

on the basis of embodiment 10, further, the method further includes: 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 12:

in addition to embodiment 10 or embodiment 11, a flux guide groove is further provided in a part of the stator lamination 100.

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

Example 13:

on the basis of embodiment 11, further, a magnetic conductance groove is provided on a part of the stator lamination 100; or all the stator laminations 100 are provided with magnetic conduction grooves.

In this embodiment, there is not the magnetic conductance recess on the iron core punching sheet in the stator core, all has the magnetic conductance recess on the stator punching sheet 100, or some stator punching sheets 100 have the magnetic conductance recess, and then on the 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 14:

on the basis of embodiment 11, further, magnetic conductance grooves are arranged on part of the iron core punching sheets; or all the iron core punching sheets are provided with magnetic conduction grooves.

In this embodiment, stator punching sheet 100 in the stator core does not have a magnetic conductance groove, and the iron core punching sheet has a magnetic conductance groove, or a part of the iron core punching sheet has a magnetic conductance groove, and then on the stator core, the punching sheet having two structures simultaneously is beneficial to improving the low-frequency energy efficiency of the motor, and is suitable for improving the mass production manufacturability.

Example 15:

on the basis of embodiment 11, further, magnetic conductance grooves are formed in part of the core laminations and part of the stator laminations 100; or only magnetic conduction grooves are formed in all the iron core punching sheets and part of the stator punching sheets 100; or only magnetic conduction grooves are formed in part of the iron 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 16:

on the basis of any one of embodiments 10 to 15, further, in the axial direction of the stator core, the total height of all the stator laminations 100 and the portions of all the core laminations provided with the magnetic conduction grooves is L1; the total height of all the stator laminations 100 and the part of all the core laminations not provided with the flux guide grooves along the axial direction of the stator core is L2, wherein,

in this embodiment, assemble two kinds of towards the piece according to different axial thickness and can obtain different motor vibration noise improvement effect, be provided with the magnetic conductance recess towards the piece overall height bigger, the noise improvement effect is better, notThe total height of the punching sheet provided with the magnetic conduction groove is larger, the energy efficiency of the motor is higher, and further the magnetic conduction groove is arranged on the punching sheet

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

equal to 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, or 0.01.

Example 17:

the present invention provides a motor, comprising: a stator core as provided in any of the above embodiments; and a rotor 210 rotatably disposed within the stator core.

The motor provided by the invention comprises the stator core provided by any embodiment, so that all the beneficial effects of the stator core provided by any embodiment are achieved, and the description is omitted.

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 magnet to rotate.

Specifically, the motor is a permanent magnet synchronous motor.

Example 18:

on the basis of the embodiment 17, further, the rotor 210 rotates along the first tooth surface 126 to the second tooth surface 128 of the stator tooth 120 of the stator lamination 100 of the stator core, that is, the rotor 210 rotates along the first end 130 to the second end 140 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 126 to the second tooth surface 128 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 126 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 position of the first tooth surface 126 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 between the armature magnetic field harmonic and the rotor 210 magnetic field harmonic is remarkably reduced, the vibration noise of the key frequency band of the compressor 200 is further improved, and the noise of the motor is reduced.

Example 19:

in example 17 or 18, the inner diameter of the stator core is Di, the rated torque of the motor is T, and the torque per unit volume of the rotor 210210 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。

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 20:

on the basis of any one of embodiments 17 to 19, further, the stator slots 150 are formed between adjacent stator teeth 120 of the stator core, and a ratio of the number of the 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 21:

as shown in fig. 4, the present invention provides a compressor 200 including: 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 provided by the present invention includes the stator core provided in any of the above embodiments or the motor provided in any of the above embodiments, so that all the advantages of the stator core provided in any of the above embodiments and the motor provided in any of the above embodiments are achieved, and are not further recited herein.

Example 22:

as shown in fig. 4, in addition to embodiment 21, 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 23:

the present invention provides a refrigeration apparatus comprising: 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 apparatus provided by the present invention includes the stator core provided in any of the above embodiments, or the motor provided in any of the above embodiments, or the compressor 200 provided in any of the above embodiments, and therefore, all the advantages of the stator core provided in any of the above embodiments, the motor provided in any of the above embodiments, and the compressor 200 provided in any of the above embodiments are not described herein.

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 24:

in an embodiment of the present invention, a stator core is provided, which is applied to an electric motor, and in particular, the electric motor includes a stator including a stator core, and the stator core is enclosed outside the rotor 210.

Specifically, a plurality of teeth are disposed on a side of the stator core facing the rotor 210, the plurality of stator teeth 120 are disposed along a circumferential direction of the stator core, a stator slot 150 is defined between adjacent stator teeth 120, so that a coil is wound on the stator teeth 120, a circle on a farthest end profile of the tooth crown 124 on one side of the rotor 210 in a rotating direction is defined as a base circle by taking a rotating center of the rotor 210 as a center, that is, a center of the base circle is a rotating center of the rotor 210, that is, a center of an inscribed circle of the plurality of stator teeth 120, and a radius of the base circle is a distance from the center of the inscribed circle of the plurality of stator teeth 120 to a second end 140 of the second tooth face 128 facing away from the first tooth face 126.

The clearance between the contour line of the surface of the crown 124 on the side and the base circle is increased from small to small with reference to the direction of the second end 140 to the center line of symmetry of the root 122 of the stator tooth 120.

The clearance between the contour line of the surface of the crown 124 on the side and the base circle is at least greatly reduced with respect to the direction from the first end 130 to the center line of symmetry of the tooth root 122 of the stator tooth 120.

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 point on the air gap side of the crown 124 on the side facing away from the root 122, which is farthest from the rotational center of the rotor 210 in the radial direction of the stator, is on the first tooth flank 126.

Specifically, stator core includes a plurality of towards the piece, and the piece piles up along the axial of stator, specifically, towards the piece including stator punching 100 and iron core towards the piece to, be provided with the magnetic conductance recess on some punching. 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 face 126 is located on the opposite side of the rotation direction of the rotor 210. The first tooth surface 126 is disposed on the opposite side of the rotation direction of the rotor 210 more advantageously to improve the vibration noise of the motor and the compressor 200.

Further, not being provided with the punching sheet of magnetic conductance recess, stacking highly for L1 along the motor axial, being provided with the punching sheet of magnetic conductance recess, stacking highly for L2 along the motor axial, satisfy:

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 the magnetic conductance recess is big more, the noise improvement effect is better, the total height of the punching sheet that is not provided with the magnetic conductance recess 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 are clamped between the stamped sheets which are not provided with the magnetic conductance grooves; and/or the punching sheets which are not provided with the magnetic conductance grooves are clamped between the punching sheets which are provided with the magnetic conductance grooves.

Example 25:

the present invention also provides a motor comprising: a stator core as in any of the embodiments above is provided.

The motor provided by the invention has all the beneficial effects of the stator core because the motor comprises the stator core provided by any one of the embodiments.

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。

Wherein the rated torque T of the motorThe unit 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 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 210210 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 26:

the present invention also provides a compressor 200 comprising: 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 provided by the invention comprises the stator core provided by any one 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 27:

according to the present invention, there is also provided a refrigerating apparatus comprising: 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 invention comprises the stator core provided by any one of the 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 invention, the terms "first", "second", and "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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

In the description herein, 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;

the tooth crown is connected with the tooth root, the end surface of one side, away from the tooth root, of the tooth crown comprises a first tooth surface and a second tooth surface along the circumferential direction of the stator yoke, one end, away from the second tooth surface, of the first tooth surface is a first end, and one end, away from the first tooth surface, of the second tooth surface is a second end;

wherein, along the direction from the first end to the second end, the distance between the first tooth surface and the center of an inscribed circle of the plurality of stator teeth gradually decreases.

2. The stator lamination as recited in claim 1,

and along the direction from the second end to the first end, the distance between the second tooth surface and the circle center of the inscribed circle of the plurality of stator teeth is gradually increased and then gradually decreased.

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 claim 1,

the first tooth surface is a circular arc surface along the circumferential direction of the stator yoke;

the second tooth surface is a circular arc surface along the circumferential direction of the stator yoke.

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

a stepped structure is formed between the first tooth surface and the second tooth surface.

6. The stator lamination as recited in claim 5,

and along the circumferential direction of the stator yoke, the circle center angle occupied by the first tooth surface is smaller than that occupied by the second tooth surface.

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

the ratio of the outer diameter of the stator yoke to the minimum inner diameter formed between the end faces of the plurality of stator teeth is 0.5 or more and 0.58 or less.

8. A stator core, comprising:

at least one stator lamination as claimed in any one of claims 1 to 7.

9. The stator core of claim 8, 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.

10. The stator core according to claim 9,

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

11. The stator core according to claim 10,

the total height of the stator punching sheet and/or the iron core punching sheet provided with the magnetic conductance grooves along the axial direction is L1;

the total height of the stator punching sheet and/or the iron core punching sheet which are not provided with the magnetic conductance grooves along the axial direction is L2,

wherein, L1/L2 is more than or equal to 0.001 and less than or equal to 0.6.

12. An electric machine, comprising:

a stator core according to any one of claims 8 to 11;

a rotor rotatably disposed within the stator core.

13. The electric machine of claim 12,

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

14. The electrical machine according to claim 12 or 13,

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

15. The electrical machine according to claim 12 or 13,

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

16. a compressor, comprising:

a stator core according to any one of claims 8 to 11; or

An electric machine as claimed in any one of claims 12 to 15.

17. A refrigeration apparatus, comprising:

a stator core according to any one of claims 8 to 11; or

The electric machine of any one of claims 12 to 15; or

The compressor of claim 16.