CN218498889U

CN218498889U - Motor, compressor and refrigeration plant

Info

Publication number: CN218498889U
Application number: CN202222992013.4U
Authority: CN
Inventors: 杨雄; 徐飞; 李宗洋
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-02-17
Anticipated expiration: 2032-11-10

Abstract

The utility model provides a motor, compressor and refrigeration plant. The motor comprises a stator core, a rotor core and a plurality of magnetic poles; the stator core comprises a plurality of first stamped sheets, the plurality of first stamped sheets are arranged along the axial direction of the motor, each first stamped sheet in the plurality of first stamped sheets comprises a yoke part and a plurality of stator teeth, the plurality of stator teeth are arranged along the circumferential direction of the yoke part, a first stator slot is formed between every two adjacent stator teeth in the plurality of stator teeth, each stator tooth in the plurality of stator teeth comprises a tooth body, a first tooth shoe and a second tooth shoe, the tooth body is connected with the yoke part, and the first tooth shoe and the second tooth shoe are respectively arranged on two sides of the tooth body in the circumferential direction; the rotor core is matched with the stator core; a plurality of magnetic poles are arranged in the circumferential direction of the rotor core; the number of the plurality of magnetic poles is larger than that of the first stator grooves, and the first tooth shoe and the second tooth shoe are asymmetric relative to a first center line of the tooth body in the radial direction.

Description

Motor, compressor and refrigeration plant

Technical Field

The utility model relates to the technical field of motors, particularly, relate to a motor, compressor and refrigeration plant.

Background

At present, in the correlation technique, along with the promotion of efficiency index, the efficiency index of motor is higher and higher, and the utmost point groove cooperation of motor can be 6 grooves 4 utmost points, 9 grooves 6 utmost points, 12 grooves 8 utmost points, and this kind of stator module and rotor subassembly's cooperation mode can lead to stator module and rotor subassembly cause the iron loss higher, and then reduces the efficiency of motor.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

To this end, a first aspect of the present invention provides an electric machine.

A second aspect of the present invention provides a compressor.

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

In view of the above, a first aspect of the present invention provides an electric machine, including a stator core, a rotor core, and a plurality of magnetic poles; the stator core comprises a plurality of first stamped sheets, the first stamped sheets are arranged along the axial direction of the motor, each first stamped sheet in the first stamped sheets comprises a yoke part and a plurality of stator teeth, the stator teeth are arranged along the circumferential direction of the yoke part, a first stator slot is formed between every two adjacent stator teeth in the stator teeth, each stator tooth in the stator teeth comprises a tooth body, a first tooth shoe and a second tooth shoe, the tooth body is connected with the yoke part, and the first tooth shoe and the second tooth shoe are respectively arranged on two sides of the tooth body in the circumferential direction; the rotor core is matched with the stator core; a plurality of magnetic poles are arranged along the circumferential direction of the rotor core; the number of the plurality of magnetic poles is larger than that of the first stator slots, and the first tooth shoe and the second tooth shoe are asymmetric relative to a first center line of the tooth body in the radial direction.

The utility model provides a motor, including stator core, rotor core and a plurality of magnetic pole. The stator core is arranged with a plurality of stator slots along an axial direction. The plurality of magnetic poles are arranged along the circumferential direction of the rotor core to achieve mounting and fixing of the plurality of magnetic poles.

Every first punching sheet in a plurality of first punching sheets includes yoke portion and a plurality of stator tooth, a plurality of stator tooth arrange along the circumference of yoke portion, first stator slot has between two adjacent stator teeth in a plurality of stator teeth, every stator tooth includes the tooth body in a plurality of stator teeth, first tooth boots and second tooth boots, the tooth body is connected with the yoke portion, first tooth boots and second tooth boots set up respectively in tooth body both sides in circumference, and first tooth boots and second tooth boots are asymmetric for tooth body first central line in footpath for the first tooth boots of asymmetry make asymmetric first tooth boots and second tooth boots can reduce stator module's iron loss, and then promote the efficiency of motor. Especially, when the synthetic harmonic magnetic field of stator module and rotor subassembly is great, asymmetric first tooth boots and second tooth boots can reduce stator module's iron loss more effectively, and then promote the efficiency of motor.

And the first tooth shoe and the second tooth shoe are arranged to be asymmetric relative to the first central line of the tooth body in the radial direction, so that the noise of the motor can be reduced when the motor runs, and particularly the electromagnetic noise of the motor can be effectively reduced.

On the basis that the first tooth shoe and the second tooth shoe are arranged to be asymmetrical relative to a first central line of a tooth body in the radial direction, the number of poles of a plurality of magnetic poles is arranged to be larger than the number of slots of a plurality of stator slots, namely, the size of each part of a stator core is limited, so that the slot area of each stator slot is limited, the number of slots is smaller than the number of poles, and as a winding coil is wound from a gap between the tooth shoes of two adjacent stator teeth, for the winding coil with the same length, the slot area of each stator slot determines the height of the end part of the winding coil in the axial direction of the stator core after the winding coil is wound, the range of magnetic flux can be further limited, so that the levels of copper loss and iron loss during the operation of the motor are restrained, the copper loss of the motor is further reduced, the efficiency of the motor reaches the optimal level, and the efficiency of the motor is further improved.

Specifically, the electric machine includes a stator winding including winding coils.

Specifically, the number of stator slots is 6, the number of stator teeth is 6, and the number of poles of the multiple magnetic poles is 8, i.e., the motor is a 6-slot 8-pole matched motor.

Further, in order to ensure the operation performance of the motor, the structure of the rotor core tends to a columnar structure rather than a regular columnar structure, for example, there may be a groove-like structure on the surface of the rotor core, so that the cross section of the rotor core in the radial direction may not be a regular circle, and a circle passing through the outermost contour of the rotor core is set as a contour circle passing through the axis of the rotor core, and if the radial cross section of the rotor core is a regular circle, the contour circle coincides with the outer edge of the radial cross section of the rotor core. The stator and the rotor core are concentrically arranged, so that the stator and the rotor core can be matched, the stator comprises a stator yoke portion, the stator yoke portion is constructed to be annular, a plurality of stator teeth are arranged on the stator yoke portion along the circumferential direction of the stator yoke portion, and the two adjacent stator teeth are arranged at intervals, so that the coils are convenient to wind.

Rotor core is the columnar structure, has seted up the magnet groove on the rotor core, the magnet groove along rotor core's axial extension and run through rotor core, the magnetic pole is installed in the magnet groove and is formed the magnetic pole, the magnetic pole can play the effect of increase magnetic flux, the magnet groove is a plurality of, a plurality of magnet grooves are along rotor core's circumference interval distribution, so the magnetic pole also is along rotor core's circumference interval distribution, and then can make magnetic field distribution more even.

The magnetic pole is a permanent magnet.

Additionally, the utility model provides an above-mentioned technical scheme in the motor can also have following additional technical characteristics:

the utility model discloses an among the technical scheme, the notch of first stator groove is at ascending width more than or equal to 6 millimeters in week, and less than or equal to 15 millimeters.

In this technical scheme, the width of the notch of first stator groove on circumference is 6 millimeters to 15 millimeters, through adjusting the width of the notch of first stator groove on circumference, realizes the adjustment to the torque of motor. And the width of the notch of the first stator slot in the circumferential direction is set between 6 mm and 15 mm, so that the reduction of the torque of the motor caused by the over-small width of the notch in the circumferential direction can be avoided, the torque reduction of the motor caused by the overlarge width of the notch in the circumferential direction can be avoided, so that the torque of the motor is effectively improved, and the performance of the motor is further improved.

Especially for the output torque of the motor, by setting the width of the notch of the first stator groove in the circumferential direction between 6 mm and 15 mm, the output torque of the motor can be effectively increased.

Specifically, the width of the notch of the first stator groove in the circumferential direction was 6 mm.

Specifically, the width of the notch of the first stator groove in the circumferential direction was 12 mm.

Specifically, the width of the notch of the first stator groove in the circumferential direction is 15 mm.

In one technical solution of the present invention, the first stator groove has a second center line in a radial direction; the distance between one end of the first tooth shoe, which is far away from the tooth body, and the second center line is a first distance; the distance between one end of the second tooth shoe, which is far away from the tooth body, and the second center line is a second distance; the ratio of the second distance to the first distance is greater than or equal to 1.1 and less than or equal to 2.

In this technical scheme, the ratio of the distance between the one end that the tooth body was kept away from to second tooth boots and second central line and the distance between the one end that the tooth body was kept away from to first tooth boots and second central line is 1.1 to 2, and the adjustment to motor efficiency is realized through adjusting the distance between the one end that the tooth body was kept away from to second tooth boots and the distance ratio between the one end that the tooth body was kept away from to first tooth boots and second central line. And the ratio of the distance between one end of the second tooth shoe, which is far away from the tooth body, and the second central line to the distance between one end of the first tooth shoe, which is far away from the tooth body, and the second central line is set to be between 1.1 and 2, so that the efficiency of the motor can be effectively improved, and the performance of the motor is further improved.

Specifically, the ratio of the distance between the end of the second tooth shoe far away from the tooth body and the second center line to the distance between the end of the first tooth shoe far away from the tooth body and the second center line is 1.1.

Specifically, the ratio of the distance between the end of the second tooth shoe far away from the tooth body and the second center line to the distance between the end of the first tooth shoe far away from the tooth body and the second center line is 1.6.

Specifically, the ratio of the distance between the end of the second tooth shoe far away from the tooth body and the second center line to the distance between the end of the first tooth shoe far away from the tooth body and the second center line is 2.

In one embodiment of the present invention, a radial distance between a side wall of the first tooth shoe facing one side of the rotor core and a side wall of the rotor core facing one side of the stator core is a third distance; the distance between any position on the side wall of one side, facing the rotor core, of the second tooth shoe and the side wall of one side, facing the stator core, of the rotor core in the radial direction is a fourth distance; the fourth distance is greater than the third distance.

In the technical scheme, the iron loss of the motor can be adjusted by adjusting the size relationship between the radial distance between the first tooth shoe and the side wall of the side, facing the stator core, of the rotor core and the radial distance between the second tooth shoe and the side wall of the side, facing the stator core, of the rotor core, so that the efficiency of the motor is adjusted. And the radial distance between the first tooth shoe and the side wall of one side of the rotor core, which faces the stator core, is set to be smaller than the radial distance between the second tooth shoe and the side wall of one side of the rotor core, which faces the stator core, so that the iron loss of the motor is reduced, and the efficiency of the motor is further improved.

Through adjusting the size relation between the radial distance between the side wall of one side of the first tooth shoe and the rotor core towards the stator core and the radial distance between the second tooth shoe and the side wall of one side of the rotor core towards the stator core, the electromagnetic excitation of the motor can be adjusted, and the noise of the motor can be adjusted. And the radial distance between the first tooth shoe and the side wall of the side of the rotor core, which faces the stator core, is set to be smaller than the radial distance between the second tooth shoe and the side wall of the side of the rotor core, which faces the stator core, so that the electromagnetic excitation of the motor is reduced, and the noise generated in the running process of the motor is further reduced.

Specifically, when the distance between the first tooth shoe and the side wall of the side of the rotor core facing the stator core is basically unchanged, namely the air gap is kept unchanged, the phase difference of the tooth harmonic magnetic field of the stator and the rotor under the load is close to 90 degrees, the peak value of the harmonic magnetic field synthesized by the stator and the rotor is higher, so that the iron loss is increased and the noise is deteriorated.

Further, the fourth distance gradually increases from a side close to the first tooth shoe to a side far from the first tooth shoe.

The utility model discloses an among the technical scheme, the ratio more than or equal to 1.2 of fourth distance and third distance, and less than or equal to 2.8.

In this technical scheme, set up to 1.2 to 2.8 through the ratio with fourth distance and third distance, can avoid leading to the radial force of motor too big because of the ratio undersize of fourth distance and third distance, also avoid leading to the radial force of motor too big because of the ratio of fourth distance and third distance, and then set up the ratio of fourth distance and third distance to 1.2 to 2.8, can effectively reduce the radial force of motor, thereby can reduce the iron loss and the electromagnetic excitation of motor, improve the efficiency and the noise reduction of motor.

Specifically, the ratio of the fourth distance to the third distance is 1.2.

Specifically, the ratio of the fourth distance to the third distance is 2.

Specifically, the ratio of the fourth distance to the third distance is 2.8.

The utility model discloses an among the technical scheme, every stator tooth is provided with first face towards one side of rotor core in a plurality of stator teeth, and first face is the cambered surface, and the axis of first face coincides for rotor core's axis.

In this technical scheme, the partial lateral wall of stator tooth towards one side of rotor core sets up to the cambered surface coaxial for rotor core, is convenient for measure stator core's radial dimension, and then ensures the qualification rate of stator core after the processing. Especially for a stator core comprising a plurality of core blocks, the partial side wall of one side of the stator tooth facing the rotor core is provided with a cambered surface which is coaxial relative to the rotor core, so that the roundness of the stator core is ensured.

Specifically, the axis of the rotor core is an axis around which the rotor core rotates. The axis of the first surface is a straight line where the center of a circle of the arc of the first surface on the radial section is located. The utility model discloses an among the technical scheme, every stator tooth is provided with the second face towards one side of rotor core in a plurality of stator teeth, and the second face is the cambered surface, arranges with first face along circumference, and the axis of second face and rotor core's axis offset.

In the technical scheme, at least part of the side wall of one side of the stator tooth facing the rotor core is set to be an arc surface which is offset relative to the axis of the rotor core, so that the distance between the stator tooth and the rotor core is gradually changed, but the distance between the stator tooth and the rotor core is suddenly increased, the weakening effect of a synthesized harmonic magnetic field can be improved, the working stability of the motor is prevented from being influenced due to the sudden change of the distance between the stator tooth and the rotor core, the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor is improved, and the noise is reduced.

Specifically, the axis of the second surface is a straight line where the center of a circular arc of the second surface on the radial cross section is located.

The utility model discloses an among the technical scheme, the shape of the terminal surface towards rotor core in the stator tooth, because the terminal surface towards rotor core includes one section at least cambered surface or one section at least plane in the stator, for example, the terminal surface towards rotor core can have one section cambered surface and other sections be the plane or have one section plane and other section position cambered surfaces in the stator tooth, thereby make along the direction of rotation against the rotor, the interval crescent of stator tooth and rotor, but not the interval crescent of stator tooth and rotor, thereby can improve the weakening effect to synthetic harmonic magnetic field, avoid the interval between stator tooth and the rotor to change suddenly and influence the job stabilization nature of motor, can reduce the iron loss and the electromagnetic excitation of motor, improve the efficiency and the noise abatement of motor.

The utility model discloses an among the technical scheme, first face is located one side of second face on the first direction, and wherein the first direction is rotor core's rotation direction.

In this technical scheme, first face is located the one side of second face on the first direction for along the direction of rotation of rotor subassembly, be first face and second face in proper order, and then make the interval between stator tooth and the rotor core increase gradually at rotor subassembly pivoted in-process, thereby can improve the weakening effect to synthetic harmonic magnetic field, avoid the interval between stator tooth and the rotor core to change suddenly and influence the job stabilization nature of motor, can reduce the iron loss and the electromagnetic excitation of motor, improve the efficiency and the noise reduction of motor.

In one technical solution of the present invention, the angle of the central angle corresponding to the first surface is a first angle; the angle of the central angle corresponding to the second surface is a second angle; the ratio of the first angle to the second angle is greater than or equal to 0.4 and less than or equal to 1.8.

In the technical scheme, the adjustment of the peak value of the harmonic magnetic field synthesized by the stator and the rotor is realized by adjusting the angle of the central angle corresponding to the first surface and the angle of the central angle corresponding to the second surface. And the ratio of the angle of the central angle corresponding to the first surface to the angle of the central angle corresponding to the second surface is set to be 0.4-1.8, so that the peak value of a harmonic magnetic field synthesized by the stator and the rotor can be effectively reduced, the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor is improved, and the noise is reduced.

Specifically, the ratio of the first angle to the second angle is 0.4.

Specifically, the ratio of the first angle to the second angle is 1.2.

Specifically, the ratio of the first angle to the second angle is 1.8.

In one technical solution of the present invention, the stator core further includes at least one second punching sheet, and the at least one second punching sheet and the plurality of first punching sheets are circumferentially arranged; the at least one second punching sheet is provided with a second stator groove, and the width of the notch of the second stator groove in the circumferential direction is smaller than that of the notch of the first stator groove in the circumferential direction.

In the technical scheme, a plurality of first punching sheets are mixed with second punching sheets, and second stator slots are formed in the second punching sheets. Because the width of the notch of the second stator slot in the circumferential direction is smaller than the width of the notch of the first stator slot in the circumferential direction, the second stator slot can better limit the stator winding in the slot, the winding is prevented from being separated from the first stator slot, the probability of the motor failure is reduced, the service life of the motor is prolonged, and the reliability of the motor is improved.

The utility model discloses an among the technical scheme, the width more than or equal to 1 millimeter, and less than or equal to 5 millimeters of notch in week of second stator slot.

In this technical scheme, set up to 1 millimeter to 5 millimeters through the width with the notch of second stator slot on circumference for the second stator slot can be positioned the winding effectively, further reduces the probability that the motor broke down, prolongs the life of motor, promotes the reliability of motor.

The utility model discloses an among the technical scheme, at least one second towards the piece including two second towards the piece, two second towards the piece set up in a plurality of first towards the both sides of piece in the axial.

In this technical scheme, the quantity of second towards the piece is two, and two second towards the piece sets up respectively in the both sides of a plurality of first towards the piece, and two second towards the piece and carry on spacingly to the winding in the both sides of a plurality of first towards the piece, have increased the distance between two second towards the piece, promote two second towards the piece and carry out fixed stability to the winding.

Furthermore, the number of the second punching sheets can also be three, two of the three second punching sheets are respectively arranged on two sides of the plurality of first punching sheets, and one second punching sheet is arranged between the plurality of first punching sheets.

Specifically, the second punching sheet is arranged in the middle of the first punching sheets in the axial direction.

In one technical scheme of the utility model, the rotor core is embedded in the inner side of the stator core; or the rotor core is sleeved outside the stator core.

In this technical scheme, rotor core inlays in stator core's inboard for the motor can regard as inner rotor motor. The rotor core is sleeved outside the stator core, so that the motor can be used as an outer rotor motor.

The utility model discloses an among the technical scheme, stator core includes a plurality of iron core pieces, and a plurality of iron core pieces are arranged along circumference.

In the technical scheme, the stator core comprises a plurality of core blocks, and the core blocks are arranged along the circumferential direction so that the core blocks form the stator core. The stator core is formed by the plurality of core blocks, so that the winding difficulty of the winding coil can be reduced when the coil of the stator winding is wound.

Specifically, a plurality of stator core submodule pieces are spliced to form to when the coiling of coil, splice stator core again after can having wound the coil, the full rate of groove can improve greatly, and then reduces the copper loss of motor. For the motor with 6 slots and 8 poles, the stator core is formed by splicing a plurality of stator core sub-modules, so that the slot fullness rate is improved as much as possible, the motor efficiency is improved, and the performance advantage of the 6-slot 8-pole motor is fully exerted.

Specifically, the number of the plurality of core blocks is 6, and the 6 core blocks are arranged in the circumferential direction.

The utility model discloses the second aspect provides a compressor, motor among the above-mentioned arbitrary technical scheme. Therefore, the compressor has all the advantages of the motor, and the description is omitted.

Specifically, the compressor includes the casing, has the cavity in the casing, and the motor can be installed in the cavity to the realization is to the installation of motor, makes the casing can protect the motor.

Specifically, the compressor still includes the installation department, and the motor is dismantled and is connected in the installation department, installs the motor in the installation department and realizes the installation and fixed to the motor, and the motor can be dismantled in the installation department and be convenient for maintain the motor, improves the convenience of maintenance process.

The utility model discloses the third aspect provides a refrigeration plant, including the motor or the compressor among any one of the above-mentioned technical scheme. Therefore, the refrigeration equipment has all the beneficial effects of the motor or the compressor, and the details are not repeated.

Specifically, the refrigeration equipment is an air conditioner or a refrigerator.

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 one of schematic structural views of a stator core according to an embodiment of the present invention;

FIG. 2 shows an embodiment according to the present invention the structure schematic diagram of the inner rotor motor of the example;

fig. 3 is a schematic illustration of the effect of slot width on motor efficiency according to an embodiment of the present invention;

fig. 4 is a second schematic structural view of a stator core according to an embodiment of the present invention;

fig. 5 is a schematic diagram of the effect of the ratio of W1 to W2 on motor efficiency according to an embodiment of the present invention;

fig. 6 is a partial schematic view of a stator core according to an embodiment of the present invention;

fig. 7 is a schematic illustration of the effect of the ratio of L1 to L2 on the radial force according to an embodiment of the invention;

fig. 8 is a schematic illustration of the effect of the ratio of D to C on the radial force according to an embodiment of the invention;

fig. 9 is one of three-dimensional schematic views of a stator core according to an embodiment of the present invention;

fig. 10 is a second three-dimensional schematic view of a stator core according to an embodiment of the present invention;

fig. 11 is a schematic structural view of an external rotor motor according to an embodiment of the present invention;

fig. 12 is a third schematic structural diagram of a stator core according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 12 is:

100 stator core, 200 first stator slot, 300 first stamped piece, 310 yoke portion, 320 stator tooth, 322 tooth body, 324 first tooth shoe, 326 second tooth shoe, 328 first face, 329 second face, 400 core piece, 500 second stamped piece, 600 second stator slot, 700 rotor core, 800 magnetic pole.

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.

A motor, a compressor, and a refrigerating apparatus according to some embodiments of the present invention will be described with reference to fig. 1 to 12.

In an embodiment of the present invention, as shown in fig. 1 and 2, there is provided an electric machine including a stator core 100, a rotor core 700, and a plurality of magnetic poles 800; the stator core 100 comprises a plurality of first punching sheets 300, the plurality of first punching sheets 300 are arranged along the axial direction of the motor, each first punching sheet 300 in the plurality of first punching sheets 300 comprises a yoke portion 310 and a plurality of stator teeth 320, the plurality of stator teeth 320 are arranged along the circumferential direction of the yoke portion 310, a first stator slot 200 is formed between two adjacent stator teeth 320 in the plurality of stator teeth 320, each stator tooth 320 in the plurality of stator teeth 320 comprises a tooth body 322, a first tooth shoe 324 and a second tooth shoe 326, the tooth body 322 is connected with the yoke portion 310, and the first tooth shoe 324 and the second tooth shoe 326 are respectively arranged on two sides of the tooth body 322 in the circumferential direction; rotor core 700 is fitted to stator core 100; a plurality of magnetic poles 800 are arranged along the circumferential direction of the rotor core 700; wherein the number of the plurality of magnetic poles 800 is greater than the number of the first stator slots 200, and the first tooth shoe 324 and the second tooth shoe 326 are asymmetrical with respect to the first center line a in the radial direction of the tooth body 322.

In this embodiment, the motor includes a stator core 100, a rotor core 700, and a plurality of magnetic poles 800. The stator core 100 is arranged with a plurality of stator slots in the axial direction. The plurality of magnetic poles 800 are arranged along the circumferential direction of the rotor core 700 to achieve mounting and fixing of the plurality of magnetic poles 800.

Each first punching sheet 300 of the plurality of first punching sheets 300 comprises a yoke portion 310 and a plurality of stator teeth 320, the plurality of stator teeth 320 are arranged along the circumferential direction of the yoke portion 310, a first stator slot 200 is formed between two adjacent stator teeth 320 of the plurality of stator teeth 320, each stator tooth 320 of the plurality of stator teeth 320 comprises a tooth body 322, a first tooth shoe 324 and a second tooth shoe 326, the tooth body 322 is connected with the yoke portion 310, the first tooth shoe 324 and the second tooth shoe 326 are respectively arranged on two sides of the tooth body 322 in the circumferential direction, and the first tooth shoe 324 and the second tooth shoe 326 are asymmetric relative to a first central line a of the tooth body 322 in the radial direction, so that the asymmetric first tooth shoe 324 and the second tooth shoe 326 can reduce iron loss of the stator assembly, and further improve the efficiency of the motor. Especially, when the resultant harmonic magnetic field of the stator assembly and the rotor assembly is large, the asymmetric first tooth shoe 324 and the asymmetric second tooth shoe 326 can more effectively reduce the iron loss of the stator assembly, thereby improving the efficiency of the motor.

And by disposing the first tooth shoe 324 and the second tooth shoe 326 asymmetrically with respect to the first center line a of the tooth body 322 in the radial direction, it is also possible to reduce noise of the motor when the motor is operating, and particularly, electromagnetic noise of the motor can be effectively reduced.

On the basis that the first tooth shoe 324 and the second tooth shoe 326 are arranged to be asymmetric relative to the first center line a of the tooth body 322 in the radial direction, the number of poles of the plurality of magnetic poles 800 is set to be larger than the number of slots of the plurality of stator slots, that is, the size of each part of the stator core 100 is limited, so that the slot area of the stator slots is limited, and the number of slots is smaller than the number of poles.

Specifically, the motor includes a stator winding including a winding coil.

Specifically, the number of stator slots is Z, the number of pole pairs P of magnetic poles, i.e., the number of poles of the magnetic poles is 2P, and Z/P =1.5 is satisfied.

The number of stator slots is 6, the number of stator teeth 320 is 6, and the number of poles of the multiple magnetic poles 800 is 8, i.e. the motor is a 6-slot 8-pole matched motor.

Further, in order to ensure the operation performance of the motor, the structure of the rotor core 700 tends to be a columnar structure rather than a regular columnar structure, for example, there may be a groove-shaped structure on the surface of the rotor core 700, so the cross section of the rotor core 700 in the radial direction may not be a regular circle, and a circle passing through the outermost contour of the rotor core 700 is set as a contour circle passing through the axis of the rotor core 700, and if the radial cross section of the rotor core 700 is a regular circle, the contour circle coincides with the outer edge of the radial cross section of the rotor core 700. The stator is concentrically disposed with the rotor core 700 so that the stator and the rotor core 700 can be fitted, the stator includes a stator yoke portion 310, the stator yoke portion 310 is configured in a ring shape, a plurality of stator teeth 320 are disposed on the stator yoke portion 310 along a circumferential direction of the stator yoke portion 310, and adjacent two stator teeth 320 are disposed at intervals therebetween so as to facilitate winding of coils.

Rotor core 700 is the columnar structure, the magnet groove has been seted up on rotor core 700, the magnet groove is along rotor core 700's axial extension and run through rotor core 700, magnetic pole 800 installs in the magnet groove and forms magnetic pole 800, magnetic pole 800 can play the effect of increase magnetic flux, the magnet groove is a plurality of, the circumference interval distribution of rotor core 700 is followed to a plurality of magnet grooves, so magnetic pole 800 also is the circumference interval distribution along rotor core 700, and then can make magnetic field distribution more even.

The magnetic pole 800 is a permanent magnet.

The present embodiment provides a motor, and in addition to the technical features of the above-described embodiments, further includes the following technical features.

As shown in fig. 1, the width W of the notch of the first stator groove 200 in the circumferential direction is 6 mm or more and 15 mm or less.

In this embodiment, the width W of the notch of the first stator groove 200 in the circumferential direction is 6 to 15 mm, and the adjustment of the torque of the motor is achieved by adjusting the width W of the notch of the first stator groove 200 in the circumferential direction. And the width W of the notch of the first stator slot 200 in the circumferential direction is set between 6 mm and 15 mm, so that the torque reduction of the motor caused by the over-small width W of the notch in the circumferential direction can be avoided, and the torque reduction of the motor caused by the over-large width W of the notch in the circumferential direction can also be avoided, thereby effectively improving the torque of the motor and further improving the performance of the motor.

Especially for the output torque of the motor, by setting the width of the notch of the first stator groove 200 in the circumferential direction between 6 mm and 15 mm, the output torque of the motor can be effectively increased.

And by adjusting the width of the notch of the first stator slot 200 in the circumferential direction, adjustment of the motor efficiency can also be achieved. As shown in fig. 3, and setting the width of the notch of the first stator slot 200 in the circumferential direction between 6 mm and 15 mm can effectively improve the efficiency of the motor.

Specifically, the width of the notch of the first stator groove 200 in the circumferential direction is 6 mm.

Specifically, the width of the notch of the first stator groove 200 in the circumferential direction is 12 mm.

Specifically, the width of the notch of the first stator groove 200 in the circumferential direction is 15 mm.

As shown in fig. 4, the first stator groove 200 has a second center line B in the radial direction; the distance between the end of the first tooth shoe 324 away from the tooth body 322 and the second center line B is a first distance W1; the second distance W2 is between the end of the second tooth shoe 326 away from the tooth body 322 and the second centerline B; the ratio of the second distance W2 to the first distance W1 is greater than or equal to 1.1 and less than or equal to 2.

In this embodiment, as shown in fig. 5, the ratio of the distance between the end of the second tooth shoe 326 away from the tooth body 322 and the second center line B to the distance between the end of the first tooth shoe 324 away from the tooth body 322 and the second center line B is 1.1 to 2, and the adjustment of the motor efficiency is achieved by adjusting the ratio of the distance between the end of the second tooth shoe 326 away from the tooth body 322 and the second center line B to the distance between the end of the first tooth shoe 324 away from the tooth body 322 and the second center line B. And the ratio of the distance between the end of the second tooth shoe 326 far away from the tooth body 322 and the second central line B to the distance between the end of the first tooth shoe 324 far away from the tooth body 322 and the second central line B is set to be 1.1-2, so that the efficiency of the motor can be effectively improved, and the performance of the motor can be further improved.

Specifically, the ratio of the distance between the end of second tooth shoe 326 remote from tooth body 322 and second centerline B to the distance between the end of first tooth shoe 324 remote from tooth body 322 and second centerline B is 1.1.

Specifically, the ratio of the distance between the end of second tooth shoe 326 remote from tooth body 322 and second centerline B to the distance between the end of first tooth shoe 324 remote from tooth body 322 and second centerline B is 1.6.

Specifically, the ratio of the distance between the end of second tooth shoe 326 remote from tooth body 322 and second centerline B to the distance between the end of first tooth shoe 324 remote from tooth body 322 and second centerline B is 2.

As shown in fig. 6, a distance between a side wall of the first tooth shoe 324 on the side facing the rotor core 700 and a side wall of the rotor core 700 on the side facing the stator core 100 in the radial direction is a third distance L1; a distance between any position on a side wall of the second tooth shoe 326 on the side facing the rotor core 700 and a side wall of the rotor core 700 on the side facing the stator core 100 in the radial direction is a fourth distance L2; the fourth distance L2 is greater than the third distance L1.

In this embodiment, by adjusting the size relationship between the radial distance between the first tooth shoe 324 and the side wall of the rotor core 700 facing the stator core 100 and the radial distance between the second tooth shoe 326 and the side wall of the rotor core 700 facing the stator core 100, the iron loss of the motor can be adjusted, and thus the motor efficiency can be adjusted. And the distance in the radial direction between the first tooth shoe 324 and the side wall of the side of the rotor core 700 facing the stator core 100 is set to be smaller than the distance in the radial direction between the second tooth shoe 326 and the side wall of the side of the rotor core 700 facing the stator core 100, so that the iron loss of the motor is reduced, and the efficiency of the motor is further improved.

By adjusting the size relationship between the radial distance between the first tooth shoe 324 and the side wall of the rotor core 700 facing the stator core 100 and the radial distance between the second tooth shoe 326 and the side wall of the rotor core 700 facing the stator core 100, the electromagnetic excitation of the motor can be adjusted, and the noise of the motor can be adjusted. And the distance between the first tooth shoe 324 and the side wall of the side of the rotor core 700 facing the stator core 100 in the radial direction is set to be smaller than the distance between the second tooth shoe 326 and the side wall of the side of the rotor core 700 facing the stator core 100 in the radial direction, so that the electromagnetic excitation of the motor is reduced, and the noise generated during the operation of the motor is further reduced.

Specifically, when the distance between the first tooth shoe 324 and the side wall of the rotor core 700 facing the side of the stator core 100 is substantially constant, that is, the air gap is kept constant, the tooth harmonic magnetic field phase difference of the stator and the rotor under load is close to 90 °, the peak value of the harmonic magnetic field synthesized by the stator and the rotor is high, thereby causing the increase of the iron loss and the deterioration of the noise, and by arranging that the distance between the first tooth shoe 324 and the side wall of the rotor core 700 facing the side of the stator core 100 in the direction opposite to the rotation direction of the rotor has a tendency to become large, so that the tooth harmonic magnetic field phase difference of the stator and the rotor under load is from 90 ° to 180 °, the peak value of the synthesized harmonic magnetic field is effectively reduced, thereby the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor can be improved, and the noise can be reduced.

Further, the fourth distance gradually increases from the side close to the first tooth shoe 324 to the side far from the first tooth shoe 324.

Further, the distance in the radial direction between the first tooth shoe 324 and the side wall of the rotor core 700 on the side facing the stator core 100 is smaller than the minimum distance in the radial direction between the second tooth shoe 326 and the side wall of the rotor core 700 on the side facing the stator core 100.

The first tooth shoe 324 and the second tooth shoe 326 may be directly connected, or a transition section may be provided between the first tooth shoe 324 and the second tooth shoe 326.

As shown in fig. 7, the ratio of the fourth distance L2 to the third distance L1 is greater than or equal to 1.2 and less than or equal to 2.8.

In this embodiment, the ratio of the fourth distance L2 to the third distance L1 is set to 1.2 to 2.8, which can avoid the situation that the radial force of the motor is too large due to the too small ratio of the fourth distance L2 to the third distance L1, and also avoid the situation that the radial force of the motor is too large due to the too large ratio of the fourth distance L2 to the third distance L1, and further the ratio of the fourth distance L2 to the third distance L1 is set to 1.2 to 2.8, which can effectively reduce the radial force of the motor, thereby reducing the iron loss and electromagnetic excitation of the motor, improving the efficiency of the motor and reducing the noise.

Specifically, the ratio of the fourth distance L2 to the third distance L1 is 1.2.

Specifically, the ratio of the fourth distance L2 to the third distance L1 is 2.

Specifically, the ratio of the fourth distance L2 to the third distance L1 is 2.8.

As shown in fig. 2, a side of each of the plurality of stator teeth 320 facing the rotor core 700 is provided with a first surface 328, the first surface 328 is an arc surface, and an axis of the first surface 328 coincides with an axis of the rotor core 700.

In this embodiment, a part of the side wall of the stator tooth 320 facing the rotor core 700 is provided as a cambered surface coaxial with the rotor core 700, which facilitates measurement of the radial dimension of the stator core 100, thereby ensuring the qualification rate of the processed stator core 100. Particularly, for the stator core 100 including the plurality of core blocks 400, a portion of a side wall of the stator teeth 320 facing one side of the rotor core 700 is provided as an arc surface coaxial with respect to the rotor core 700, so that the roundness of the stator core 100 is easily ensured.

Specifically, the axis of the rotor core 700 is an axis around which the rotor core rotates. The axis of the first face 328 is a straight line at the center of the arc of the first face 328 in the radial cross-section. The present embodiment provides a motor, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features.

As shown in fig. 2, each of the plurality of stator teeth 320 is provided with a second face 329 on a side of the stator tooth 320 facing the rotor core 700, the second face 329 is an arc face and is circumferentially arranged with the first face 328, and an axis of the second face 329 is offset from an axis of the rotor core 700.

In this embodiment, at least a portion of a sidewall of one side of stator tooth 320 facing rotor core 700 is set to be an arc surface offset with respect to an axis of rotor core 700, so that a distance between stator tooth 320 and rotor core 700 is gradually changed, rather than a distance between stator tooth 320 and rotor core 700 being suddenly increased, thereby improving a weakening effect on a synthesized harmonic magnetic field, preventing a gap between stator tooth 320 and rotor core 700 from being suddenly changed to affect the operation stability of the motor, reducing iron loss and electromagnetic excitation of the motor, improving the efficiency of the motor, and reducing noise.

Specifically, the axis of the second face 329 is a straight line on which the center of the circular arc of the second face 329 in the radial cross section is located.

Further, a first face 328 is disposed on the first tooth shoe 324 and a second face 329 is disposed on the second tooth shoe 326.

The present embodiment provides a motor, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features.

The shape of the end face of the stator tooth 320 facing the rotor core 700 is that the end face of the stator facing the rotor core 700 includes at least one arc face or at least one flat face, for example, the end face of the stator tooth 320 facing the rotor core 700 may have one arc face and the other flat face or one flat face and the other flat face, so that the distance between the stator tooth 320 and the rotor is gradually increased along the direction opposite to the rotation direction of the rotor, rather than the distance between the stator tooth 320 and the rotor is suddenly increased, thereby improving the weakening effect on the synthesized harmonic magnetic field, avoiding the influence on the working stability of the motor caused by the sudden change of the distance between the stator tooth 320 and the rotor, reducing the iron loss and electromagnetic excitation of the motor, improving the efficiency of the motor and reducing the noise.

As shown in fig. 2, the first surface 328 is positioned at one side of the second surface 329 in a first direction E, which is a rotation direction of the rotor core 700.

In this embodiment, the first surface 328 is located on one side of the second surface 329 in the first direction E, so that the first surface 328 and the second surface 329 are arranged in sequence along the rotation direction of the rotor assembly, and further, the distance between the stator teeth 320 and the rotor core 700 is gradually increased in the rotation process of the rotor assembly, so that the weakening effect on the synthesized harmonic magnetic field can be improved, the phenomenon that the working stability of the motor is affected due to the sudden change of the distance between the stator teeth 320 and the rotor core 700 is avoided, the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor is improved, and the noise is reduced.

As shown in fig. 6, the central angle of the first surface 328 is a first angle C; the central angle of the second surface 329 is a second angle D; the ratio of the first angle C to the second angle D is greater than or equal to 0.4 and less than or equal to 1.8.

In this embodiment, the adjustment of the peak value of the harmonic magnetic field synthesized by the stator and the rotor is realized by adjusting the angle of the central angle corresponding to the first surface 328 and the angle of the central angle corresponding to the second surface 329. And the ratio of the angle of the central angle corresponding to the first surface 328 to the angle of the central angle corresponding to the second surface 329 is set to be 0.4 to 1.8, so that the peak value of the harmonic magnetic field synthesized by the stator and the rotor can be effectively reduced, the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor is improved, and the noise is reduced.

As shown in fig. 8, the radial force of the motor can be adjusted by adjusting the angle of the central angle corresponding to the first surface 328 and the angle of the central angle corresponding to the second surface 329. The ratio of the angle of the central angle corresponding to the first surface 328 to the angle of the central angle corresponding to the second surface 329 is set to 0.4 to 1.8, so that the radial force of the motor can be effectively reduced, the iron loss and the electromagnetic excitation of the motor can be reduced, the efficiency of the motor is improved, and the noise is reduced.

Specifically, the ratio of the first angle C to the second angle D is 0.4.

Specifically, the ratio of the first angle C to the second angle D is 1.2.

Specifically, the ratio of the first angle C to the second angle D is 1.8.

As shown in fig. 9 and 10, the stator core 100 further includes at least one second punching sheet 500, and the at least one second punching sheet 500 and the plurality of first punching sheets 300 are arranged along the circumferential direction; the at least one second punching sheet 500 is provided with a second stator slot 600, and the width of the notch of the second stator slot 600 in the circumferential direction is smaller than the width of the notch of the first stator slot 200 in the circumferential direction.

In this embodiment, the second punching sheet 500 is interposed in the plurality of first punching sheets 300, and the second stator slot 600 is provided on the second punching sheet 500. Because the width of the notch of the second stator slot 600 in the circumferential direction is smaller than the width of the notch of the first stator slot 200 in the circumferential direction, the second stator slot 600 can better limit the stator winding in the slot, the winding is prevented from being separated from the first stator slot 200, the probability of the motor failure is reduced, the service life of the motor is prolonged, and the reliability of the motor is improved.

The width of the notch of the second stator slot 600 in the circumferential direction is 1 mm or more and 5 mm or less.

In this embodiment, the width of the notch of the second stator slot 600 in the circumferential direction is set to be 1 mm to 5 mm, so that the second stator slot 600 can effectively position the winding, the probability of the motor failure is further reduced, the service life of the motor is prolonged, and the reliability of the motor is improved.

As shown in fig. 9, the at least one second punching sheet 500 includes two second punching sheets 500, and the two second punching sheets 500 are disposed on two sides of the plurality of first punching sheets 300 in the axial direction.

In this embodiment, the number of the second punching sheets 500 is two, the two second punching sheets 500 are respectively disposed on two sides of the plurality of first punching sheets 300, the two second punching sheets 500 limit the windings on two sides of the plurality of first punching sheets 300, the distance between the two second punching sheets 500 is increased, and the stability of the two second punching sheets 500 in fixing the windings is improved.

Further, as shown in fig. 10, the number of the second punching sheets 500 may also be three, two second punching sheets 500 in the three second punching sheets 500 are respectively disposed on two sides of the plurality of first punching sheets 300, and one second punching sheet 500 is disposed between the plurality of first punching sheets 300.

Specifically, one second punching sheet 500 is disposed at the middle of the plurality of first punching sheets 300 in the axial direction.

Further, the number of the second punching pieces 500 is smaller than the number of the first punching pieces 300.

As shown in fig. 2, the rotor core 700 may be embedded inside the stator core 100.

As shown in fig. 11, the rotor core 700 may be sleeved outside the stator core 100.

In this embodiment, the rotor core 700 is embedded inside the stator core 100 so that the motor can be an inner rotor motor. The rotor core 700 is sleeved outside the stator core 100, so that the motor can be used as an outer rotor motor.

As shown in fig. 12, the stator core 100 includes a plurality of core blocks 400, and the plurality of core blocks 400 are arranged in a circumferential direction.

In this embodiment, the stator core 100 includes a plurality of core blocks 400, and the plurality of core blocks 400 are arranged in the circumferential direction such that the plurality of core blocks 400 constitute the stator core 100. By forming the stator core 100 as a plurality of core blocks 400, the winding difficulty of the winding coil can be reduced when the winding of the coil of the stator winding is performed.

Specifically, a plurality of stator core 100 submodule pieces are spliced to form to when the coiling of coil, splice stator core 100 again after can having wound the coil, the full rate of groove can improve greatly, and then reduces the copper loss of motor. For the motor with 6 slots and 8 poles, the stator core 100 is formed by splicing a plurality of stator core 100 sub-modules, so that the slot fullness rate is improved as much as possible, the motor efficiency is improved, and the performance advantage of the 6-slot 8-pole motor is fully exerted.

Specifically, the number of the plurality of core blocks 400 is 6, and 6 core blocks 400 are arranged in the circumferential direction.

In an embodiment of the present invention, there is provided a compressor including the motor in any one of the above embodiments. Therefore, the compressor has all the beneficial effects of the motor, and the details are not repeated.

In an embodiment of the present invention, there is provided a refrigeration apparatus, including the motor or the compressor in any one of the above embodiments. Therefore, the refrigeration equipment has all the beneficial effects of the motor or the compressor, and the details are not repeated.

In particular, the refrigeration device is an air conditioner or a refrigerator.

In the claims, the specification and the drawings attached to the specification, the term "plurality" means two or more, unless there is an additional definite limitation, the terms "upper", "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings only for the purpose of describing the present invention more conveniently and simplifying the description process, but not for the purpose of indicating or implying that the referred device or element must have the described specific orientation, be constructed and operated in the specific orientation, and thus the description should not be construed as limiting the present invention; the terms "connect," "mount," "secure," and the like are to be construed broadly, and for example, "connect" may refer to a fixed connection between multiple objects, a removable connection between multiple objects, or an integral connection; the multiple objects may be directly connected to each other or indirectly connected to each other through an intermediate. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the above data.

In the claims, the specification and drawings of the specification, the description of the term "one embodiment," "some embodiments," "specific embodiments," and the like, 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 the claims, the description and the drawings of the present application, schematic representations of the above terms 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. An electric machine, comprising:

the stator core comprises a plurality of first stamped sheets, the plurality of first stamped sheets are arranged along the axial direction of the motor, each first stamped sheet in the plurality of first stamped sheets comprises a yoke part and a plurality of stator teeth, the plurality of stator teeth are arranged along the circumferential direction of the yoke part, a first stator groove is formed between two adjacent stator teeth in the plurality of stator teeth, each stator tooth in the plurality of stator teeth comprises a tooth body, a first tooth shoe and a second tooth shoe, the tooth body is connected with the yoke part, and the first tooth shoe and the second tooth shoe are respectively arranged on two sides of the tooth body in the circumferential direction;

the rotor iron core is matched with the stator iron core;

a plurality of magnetic poles arranged along a circumferential direction of the rotor core;

wherein the number of the plurality of magnetic poles is greater than the number of the first stator slots, and the first and second tooth shoes are asymmetrical with respect to a first centerline of the tooth body in a radial direction.

2. The electric machine according to claim 1, wherein a width of a notch of the first stator slot in a circumferential direction is 6 mm or more and 15 mm or less.

3. The electric machine of claim 1, wherein the first stator slot has a second centerline in a radial direction;

the distance between one end of the first tooth shoe, which is far away from the tooth body, and the second center line is a first distance;

the distance between one end, far away from the tooth body, of the second tooth shoe and the second center line is a second distance;

the ratio of the second distance to the first distance is greater than or equal to 1.1 and less than or equal to 2.

4. The electric machine of claim 1, wherein a side wall of a side of the first tooth shoe facing the rotor core is radially spaced from a side wall of a side of the rotor core facing the stator core by a third distance;

a distance between any position on a side wall of one side of the second tooth shoe facing the rotor core and a side wall of one side of the rotor core facing the stator core in the radial direction is a fourth distance;

the fourth distance is greater than the third distance.

5. The electric machine of claim 4, wherein a ratio of the fourth distance to the third distance is greater than or equal to 1.2 and less than or equal to 2.8.

6. The electric machine of claim 4, wherein a side of each of the plurality of stator teeth facing the rotor core is provided with a first face, the first face being an arc face, an axis of the first face coinciding with respect to an axis of the rotor core.

7. The electric machine of claim 6, wherein each of the plurality of stator teeth is provided with a second face on a side facing the rotor core, the second face being an arcuate face arranged circumferentially with the first face, an axis of the second face being offset from an axis of the rotor core.

8. The electric machine of claim 7, wherein the first face is located on one side of the second face in a first direction, wherein the first direction is a rotational direction of the rotor core.

9. The motor of claim 7, wherein the angle of the central angle corresponding to the first face is a first angle;

the angle of the central angle corresponding to the second surface is a second angle;

the ratio of the first angle to the second angle is greater than or equal to 0.4 and less than or equal to 1.8.

10. The electric machine of claim 1, wherein the stator core further comprises:

the at least one second punching sheet and the plurality of first punching sheets are arranged along the circumferential direction;

the at least one second punching sheet is provided with a second stator groove, and the width of the notch of the second stator groove in the circumferential direction is smaller than that of the notch of the first stator groove in the circumferential direction.

11. The electric machine of claim 10, wherein the width of the slot opening of the second stator slot in the circumferential direction is greater than or equal to 1 mm and less than or equal to 5 mm.

12. The electric machine of claim 10, wherein the at least one second stamped segment comprises two second stamped segments disposed on opposite sides of the plurality of first stamped segments in the axial direction.

13. The electric machine according to any one of claims 1 to 12, wherein the rotor core is embedded inside the stator core; or

The rotor core is sleeved on the outer side of the stator core.

14. The electric machine according to any one of claims 1 to 12, wherein the stator core comprises:

a plurality of core blocks arranged in a circumferential direction.

15. A compressor, characterized by comprising an electric machine according to any one of claims 1 to 14.

16. A refrigeration device comprising a motor as claimed in any one of claims 1 to 14, or a compressor as claimed in claim 15.