WO2016082639A1

WO2016082639A1 - Stator iron core and stator, motor

Info

Publication number: WO2016082639A1
Application number: PCT/CN2015/092565
Authority: WO
Inventors: 樊学敏; 朱婷婷; 张守军
Original assignee: 广东威灵电机制造有限公司
Priority date: 2014-11-28
Filing date: 2015-10-22
Publication date: 2016-06-02
Also published as: CN104467212B; SG11201704187VA; CN104467212A; KR20170090420A

Abstract

A stator iron core (1) and stator, motor, related to the field of motor, the stator iron core comprising: a stator yoke (11) and several stator teeth (12) disposed on the stator yoke. A bottom slot (13) is formed between any two neighboring stator teeth, the stator yoke has two axial ends disposed in opposite directions, top slots (14) in a same quantity as the bottom slots are disposed on at least one of the two axial ends, each top slot is disposed to be paired up with a respective bottom slot, the stator yoke has a radial spacer portion (111) spaced and disposed between the top slot and the bottom slot and a circumferential spacer portion (112) spaced and disposed between two neighboring top slots. Disposing the top slot opposite to the bottom slot recessed on at least one end portion in the axial direction of the stator yoke effectively shortens the winding path of the stator winding set on the stator yoke, thus reducing the amount of enamel wire and the consumption of the stator winding set, further increasing motor efficiency.

Description

Title: Inventor Name: Stator Core and Stator, Motor Technology

[0001] The present invention relates to the field of electric machines, and in particular to a stator core and a stator having the stator core, and a motor having the stator.

Background technique

[0002] An air conditioner fan motor commonly used in the prior art has the following structure: The stator core is formed by only one punch, and the stator winding is wound around the stator yoke of the stator core. The air conditioner fan motor has the following disadvantages in specific applications: The winding path of the stator winding on the stator yoke is substantially rectangular, and the winding path is relatively long, thereby causing a large amount of enameled wire and comparing the loss of the stator winding. Large, and thus seriously affect the improvement of motor efficiency.

technical problem

[0003] The object of the present invention is to overcome the deficiencies of the prior art described above, and provide a stator core, a stator, and an electric motor, which solves the problem that the existing stator winding has a long winding path on the stator yoke, resulting in a large amount of enameled wire and loss of the stator winding. Technical problems that are difficult to improve with large motor efficiency.

Problem solution

Technical solution

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a stator core, comprising a stator yoke and a plurality of stator teeth disposed on the stator yoke, and a stator is formed between any two adjacent stator teeth a wire slot, the stator yoke has two opposite axial ends, and at least one of the axial ends is further recessed with a number of wire grooves equal to the number of the drop grooves, and each of the slots The wire trough is disposed opposite to each of the drop grooves, and the stator yoke has a radial partition portion partitioned between the opposite wire groove and the drop groove and is spaced apart from A circumferential partition between two adjacent wire grooves.

[0005] Preferably, the above-described stator core includes two half-core splits that are joined to each other end to end, and the half-core split body is formed by stacking at least two punches in the axial direction.

[0006] Preferably, the half core split body is formed by laminating a plurality of first punching pieces and a plurality of second punching pieces, and each of the first punching pieces is sequentially laminated to form a laminated body, each of which is a second punch is laminated on the body of the laminate The same side; or, each of the second punches is respectively laminated on both sides of the laminated body.

[0007] Preferably, one side of the first punching piece is spaced apart from the first slot, and two sides of the second punching piece are respectively spaced apart from each other by a plurality of second slot slots and a plurality of a third slot, the number of the second slot and the number of the third slot are the same as the number of the first slot, and each of the second slot and the slot The third port groove is disposed opposite to each other, and each of the first port groove and each of the second port grooves are axially stacked to form the drop groove, and each of the third port grooves is axially Stacked into the wire trough.

[0008] Preferably, the first punching piece includes a first yoke piece and a plurality of first tooth pieces protruding from one side of the first yoke piece, and any two adjacent ones of the first tooth pieces are Forming one of the first port grooves; the second punching piece includes a second yoke piece and a plurality of second tooth pieces protruding from a side of the second yoke piece, the second yoke piece including a half-circumferential yoke a yoke piece having the same number and the same number as the second tooth piece, wherein the second tooth piece and the yoke piece are respectively protruded from each other on opposite sides of the half-circumferential yoke piece, and any two adjacent A second port is formed between the second teeth, and a third port is formed between any two adjacent yoke pieces.

[0009] Preferably, each of the stator teeth is circumferentially enclosed to form a hollow inner hole through which the rotor is bored, and the drop groove includes a notch adjacent to the hollow inner hole and a groove away from the hollow inner hole. And a slot between the slot and the slot, the slot extending obliquely along the hollow inner hole toward the side of the slot in a gradually increasing width, the slot shoulder The notch extends obliquely toward the side of the trough body in a gradually increasing width.

[0010] Preferably, the number of the drop grooves is sixteen, and the inner diameter of the hollow inner hole is Φ47 mm.

-049mm, the stator wheel has a diameter of Φ74 mm - 084 mm.

[0011] Preferably, the stator teeth include wide teeth and narrow teeth having a width smaller than the width of the wide teeth, each of the wide teeth and each of the narrow teeth being circumferentially alternately distributed inside the stator yoke, and The width of the wide tooth is 4.0 mm to 4.5 mm, the width of the narrow tooth is 3.0 mm to 3.5 mm, and the width of one end of the notch near the hollow inner hole is 1.7 mm to 1.9 mm. The width of the slot is from 0.5 mm to 0.8 mm, the radial extension of the slot is from 0.5 mm to 0.8 mm, and the radial extension of the slot is 0. 45 mm - 0.65 Mm, the radial partition has a radial extension height of 1.0 mm to 6.0 mm.

Further, an embodiment of the present invention further provides a stator including the stator core described above and a stator winding wound around the stator yoke. Further, an embodiment of the present invention further provides an electric machine including the stator described above and a rotor mated with the stator.

Advantageous effects of the invention

Beneficial effect

[0014] The stator core, the stator and the motor provided by the present invention, by recessing a wire groove opposite to the drop groove at at least one axial end of the stator yoke, so that the stator winding is wound around the stator yoke, Winding through the slot. Since the stator winding bypasses the wire slot in a diagonal line segment, the present invention is equivalent to changing a certain winding path of the existing stator winding from an L-shaped bending path to a line segment. The path, in this way, according to the principle of the shortest line segment between two points, we can know that the invention effectively shortens the winding path of the stator winding on the stator yoke, thereby reducing the amount of enameled wire and the loss of the stator winding, and thus the efficiency of the motor. Enhancements provide a new solution. Brief description of the drawing

DRAWINGS

1 is a schematic plan view showing a stator core according to an embodiment of the present invention;

2 is a schematic perspective structural view of a half iron core split body according to an embodiment of the present invention;

3 is a schematic plan view showing a planar structure of a half-core split body according to an embodiment of the present invention;

4 is a schematic plan view showing a first punching piece according to an embodiment of the present invention;

5 is a schematic plan view showing a second punching piece according to an embodiment of the present invention;

6 is a schematic cross-sectional structural view of a motor according to an embodiment of the present invention.

Embodiments of the invention

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] It is to be noted that when an element is referred to as being "fixed" or "in" another element, it can be directly on the other element or possibly the same. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or. As shown in FIG. 1 and FIG. 2, a stator core 1 according to an embodiment of the present invention includes a stator yoke 11 and a plurality of stator teeth 12 disposed on the stator yoke 11 between any two adjacent stator teeth 12 A drop line 13 is formed, the stator yoke 11 has two opposite axial ends (axially extending ends), and at least one of the axial ends is concavely equal in number to the number of the drop grooves 13 The wire passing groove 14 is disposed opposite to each of the wire passing grooves 14 and the respective drop grooves 13, and the stator yoke 11 has a radial partition portion which is disposed between the opposing wire passing groove 14 and the falling groove 13 111 and a circumferential partition portion 112 interposed between adjacent two wire passing grooves 14. The opposite wire troughs 14 and the drop grooves 13 are respectively disposed on two sides of the radial partition portion 111, and the wire trough 14 and the drop groove 13 are arranged in a mouth shape, and the chute and the drop groove are arranged. The mouth of the 13 is opposite to the radial partition portion 111, that is, the direction of the mouth of the wire groove 14 is opposite to the direction of the mouth of the drop groove 13. In the embodiment of the present invention, according to the principle that the line segment between the two points is the shortest, the wire groove 14 opposite to each of the drop grooves 13 is recessed at at least one axial end of the stator yoke 11 so that the existing stator winding 2 can be A certain winding path wound on the stator yoke 11 is changed from an L-shaped bending path to a line path, thereby effectively shortening the winding path of the stator winding 2 on the stator yoke 11, reducing the amount of enameled wire and the stator winding. The loss of 2, in turn, provides a new solution for the improvement of motor efficiency, and helps to reduce the temperature rise during motor operation, which is beneficial to extend the service life of the motor.

[0024] Preferably, as shown in FIG. 1 and FIG. 2, the above-described stator core 1 includes two half-core split bodies 10 which are joined to each other end to end, that is, the stator core 1 is separated by two half-core cores for 10 weeks. The splicing is formed; and the half core split body 10 is formed by laminating at least two punching sheets in the axial direction. In the specific production, the two semi-core split bodies 10 are respectively laminated by using punching sheets, and then the sub-windings 2 are separately wound on the stator yokes 11 of the two half-core split bodies 10, and finally two and a half are further The core split body 10 is welded to form an integral stator core 1. In the present embodiment, the stator core 1 is divided into two half-core split bodies 10 separately manufactured and wound separately, so that the winding of the stator winding 2 on the stator yoke 11 can be facilitated, thereby ensuring that the stator winding 2 is in the stator. The smoothness of winding on the yoke 11 and the winding efficiency of the stator winding 2 are improved. The semi-core split body 10 is formed by laminating at least two kinds of punching pieces in the axial direction, so that at least one axial end portion of the stator core 1 formed by lamination can be formed to form the wire groove 14 , thereby facilitating the formation of the wire groove 14 . The winding path of the stator winding 2 on the stator yoke 11 can be effectively shortened; at the same time, the semi-core split body 10 is laminated by punching, which can simplify the production process of the stator core 1 and reduce the stator iron. The production cost of the core 1. Preferably, in the present embodiment, the two half-core split bodies 10 joined to form the stator core 1 have the same structure, that is, the two half-core split bodies 10 correspond to the stator cores 1 being diametrically aligned along one of their axes of symmetry. It is divided into segments, which helps to reduce the number of components and facilitates the interchangeability of components. [0025] Preferably, as shown in FIG. 2, FIG. 4 and FIG. 5, the half core split body 10 is formed by laminating a plurality of first punching pieces 101 and a plurality of second punching pieces 102, and each of the first punching pieces is formed. 101 is sequentially laminated to form a lamination main body, that is, each of the first punching pieces 101 is sequentially laminated together, and each of the second punching pieces 102 is laminated on the same side of the lamination main body, so that the finally formed stator core 1 is formed. The wire grooves 14 are formed only at one axial end portion; or, the second punching plates 102 are respectively laminated on both sides of the laminated body, such that the finally formed stator core 1 is at both axial ends A wire groove 14 is formed. In this embodiment, the half core split body 10 is only formed by laminating the two punching sheets of the first punching piece 101 and the second punching piece 102, and each of the first punching pieces 101 is laminated together, and each second punching The sheet 102 is laminated on one side of each of the first punching sheets 101 and may be laminated on both sides of each of the second punching sheets 102, so that the wire grooves 14 can be formed only at one axial end of the stator yoke 11 respectively. The effect and the effect of forming the wire groove 14 at both axial ends of the stator yoke 11 are obtained. Of course, in a specific application, the half core split body 10 may also be formed by laminating two or more punches, so that the formed wire trunk groove 14 is a stepped groove.

Specifically, as shown in FIG. 2, FIG. 4 and FIG. 5, one side of the first punching piece 101 is spaced apart from each other by a plurality of first opening grooves 1011, and two sides of the second punching piece 102 are respectively spaced apart. a plurality of second port slots 1021 and a plurality of third port slots 1022, the number of the second port slots 1021 and the number of the third port slots 1022 are the same as the number of the first slot slots 1 011, and each The second port groove 1021 is respectively disposed opposite to the third port groove 1022, and each of the first port groove 1011 and each of the second port groove 1021 are axially stacked into a drop groove 13 for each third port. The grooves 102 2 are stacked in the axial direction into the wire grooves 14. The shape of the first port groove 1011 is the same as that of the second port groove 1021, and is the same as the cross-sectional shape of the drop groove 13, and the shape of the third port groove 1022 is the same as that of the wire groove 14. Thus, by the structural shape of the first punching piece 101 and the second punching piece 102, it is ensured that the shape of the finally formed stator core 1 satisfies the design requirements.

[0027] Specifically, as shown in FIG. 2, FIG. 4 and FIG. 5, the first punching piece 101 includes a first yoke piece 1012 and a plurality of first tooth pieces 1013 protruding from the side of the first yoke piece 1012, any A first port groove 1011 is formed between the two adjacent first teeth 1013; the second punching piece 102 includes a second yoke piece 1023 and a plurality of second pieces protruding from the second yoke piece 10 23 side. 1024, the second yoke piece 1023 includes a half-circumferential yoke 10231 and a number of the same ribs 10232 as the second tooth piece 1024. The second tooth piece 1024 and the convex yoke piece 10232 are respectively protruded from the half-circumferential yoke piece 10231. On both sides, the circumferential width of the yoke piece 10232 is equal to the circumferential width of the root portion of the second tooth 1024 opposite thereto, and a second port groove 102 1 is formed between any two adjacent second teeth 1024. A third port groove 1022 is formed between any two adjacent yoke pieces 10232. First tooth 1013 and The second tooth piece 1024 is laminated to form the stator tooth 12, the first yoke piece 1012 and the second yoke piece 1023 are laminated to form the stator yoke 11, and the half-circumference yoke piece 10231 is laminated to form a radial partition portion 111, and the convex yoke piece 10232 is laminated. A circumferential partition portion 112 is formed.

[0028] Preferably, as shown in FIG. 1, FIG. 2 and FIG. 3, each stator tooth 12 is enclosed in a circumferential direction to form a hollow inner hole 15 through which the rotor 3 is bored, and the drop groove 13 includes a hollow inner hole 15 a notch 131, a groove body 132 away from the hollow inner hole 15, and a groove shoulder 123 between the notch 131 and the groove body 132. The notch 131 faces the groove shoulder 123 along the hollow inner hole 15 in a gradually increasing width L1. The side slope extends, and the shoulder 123 extends obliquely toward the side of the groove body 132 along the slot 131 in such a manner that the width L1 gradually increases. Specifically, each of the stator teeth 12 is protruded in the circumferential direction on the inner side wall of the stator yoke 11, i.e., the hollow inner hole 15 is formed inside the stator teeth 12. In the present embodiment, by optimizing the shape of the drop line 13, the stator winding 2 can be better wound in the drop line 13 on the one hand, and the stator tooth 12 and the stator yoke 11 can be further improved on the other hand. The uniformity of the dense distribution, which in turn helps to improve the material utilization of the stator and improve the efficiency of the motor.

[0029] Preferably, as shown in FIGS. 1 to 5, the number of the drop grooves 13 is sixteen, that is, each half-core split body 10 has eight drop grooves 13; the inner diameter D1 of the hollow inner hole 15 Φ47 mm

-049mm, the outer diameter D2 of the stator yoke 11 is Φ74 ηηη - Φ84ιηιη; the stator teeth 12 include the wide teeth 121 and the circumferential width (projection width in the circumferential direction of the stator core 1) narrow teeth smaller than the circumferential width of the wide teeth 122 The wide teeth 121 and the narrow teeth 122 are alternately distributed in the circumferential direction on the inner side of the stator yoke 11, and the width L1 of the wide teeth (projection width in the circumferential direction of the stator core 1) is 4.0 mm to 4.5 mm, narrow teeth The width L2 (projection width in the circumferential direction of the stator core 1) is 3.0 mm to 3.5 mm; the width L3 of the notch 131 near the end of the hollow inner hole 15 (projection width in the circumferential direction of the stator core 1) 1.7 mm to 1.9 mm, the width L4 of the end of the notch 131 near the shoulder 123 (projection width in the circumferential direction of the stator core 1) is 1.8 m to 2.0 mm; the radial extension height HI of the notch 131 ( The projection height in the radial direction of the stator core 1 is 0.5 mm to 0.8 mm, and the radial extension height H2 of the shoulder 123 (projection height in the radial direction of the stator core 1) is 0.45 mm to 0.65 mm, radial The radial extension height H3 of the partition portion 111 (the projection height in the radial direction of the stator core 1) is 1.0 m. m~6.0mm. Specifically, the stator teeth 12 include a root 1201 protruding from an inner wall of the stator yoke 11 and a crown 1202 protruding from an end of the root 1201. Each of the roots 1201 is along the stator yoke in a form of a circumferential width L1. The inner wall of the eleventh portion extends toward the crown 1202, and the circumferential width of each of the circumferential partition portions 112 is equal to the circumferential width of the tooth root 1201 of the stator teeth 12 opposed thereto. In the embodiment, the width L1 of the wide tooth 121 refers to the circumferential width of the tooth root 1201 of the wide tooth 121, and the width L2 of the narrow tooth 122 refers to the circumferential width of the tooth root 1201 of the narrow tooth 122, and each width. The circumferential width L1 of the tooth root 1201 of the tooth 121 is equal, both of which are 4.0 mm to 4.5 mm _; the circumferential width L2 of the root 1201 of each narrow tooth 122 is equal, and both are 3.0 mm to 3.5 mm. In the present embodiment, by optimizing the parameter design of the stator core 1, the stator winding 2 can be better wound in the drop line 13 and the magnetic field distribution of the stator yoke 11 and the stator teeth 12 can be made reasonable. Uniform, in this way, on the one hand, the temperature rise during the operation of the motor is reduced, the service life of the motor is prolonged, and the efficiency of the motor is improved; on the other hand, the material utilization rate of the punch is improved, and the stator core 1 is reduced. Material costs.

[0030] Specifically, as shown in FIGS. 2 to 5, the first tooth piece 1013 includes a first wide tooth piece 10131 and a first narrow tooth piece 10132 which are alternately arranged with each other, adjacent to the first wide tooth piece 10131 and the first narrow A first slot 1011 is formed between the teeth 10132. The root width of the first wide blade 10131 is L1, the root width of the first narrow blade 10132 is L2, and the second blade 1024 includes a plurality of alternately arranged. The second wide tooth piece 10241 and the second narrow tooth piece 1024 2 form a second port groove 1021 between the adjacent second wide tooth piece 1041 and the second narrow tooth piece 1042, and the root width of the second wide tooth piece 10241 is L1, the root width of the second narrow tooth piece 1042 is L2, the first wide tooth piece 10131 and the second wide tooth piece 1041 are laminated to form the wide tooth 121, and the first narrow tooth piece 10132 and the second narrow tooth piece 102424 are stacked. The pressure forms a narrow tooth 122.

[0031] Preferably, as shown in FIG. 1, FIG. 2 and FIG. 3, the outer wall of the stator yoke 11 is further provided with a trimming structure 16, which is equivalent to using a plane to cut off part of the material of the stator yoke 11 after the stator A tangent plane formed on the outer wall of the yoke 11. The arrangement of the trimming structure 16 optimizes the magnetic field distribution of the stator yoke 11 on the one hand, so that the magnetic field distribution of the stator yoke 11 and the stator teeth 12 is more uniform; on the other hand, the material cost of the stator core 1 is reduced. Of course, in the specific application, the outer wall of the stator yoke 11 may not be provided with the trimming structure 16.

Further, as shown in FIG. 6, an embodiment of the present invention further provides a stator including the stator core 1 described above and a stator winding 2 wound around the stator yoke 11. According to the stator provided by the embodiment of the present invention, since the stator core 1 described above is used, the winding path of the stator winding 2 on the stator yoke 11 can be effectively shortened, thereby reducing the amount of the enameled wire and the loss of the stator winding 2, and further It can provide a new solution for the improvement of motor efficiency. At the same time, it can also reduce the temperature rise during motor operation, which can help avoid the situation that the motor temperature is too high, which will help to extend the service life of the motor. Helps reduce the cost of the motor.

[0033] Further, as shown in FIG. 6, an embodiment of the present invention further provides an electric motor including the stator and the above The rotor 3 mated with the stator. The motor provided by the embodiment of the invention adopts the above-mentioned stator, so that the efficiency of the motor can be effectively improved on the one hand, and the phenomenon that the running temperature of the motor is too high can be avoided on the other hand.

Therefore, it is beneficial to extend the service life of the motor; on the other hand, the cost of the motor can be reduced.

[0034] Specifically, as shown in FIG. 6, the motor provided by the embodiment of the present invention is specifically a plastic-sealed motor, which further includes a rotating shaft 5, a plastic sealing shell 4, a first end cover 6, a second end cover 7, and a first bearing 8. And the second bearing 9, the rotor 3, the first bearing 8 and the second bearing 9 are all fitted on the rotating shaft 5, and the first bearing 8 and the second bearing 9 are respectively located on both sides of the rotor 3, and the rotor 3 is passed through the stator core In the hollow inner bore 15, the first bearing 8 is mounted in the first end cap 6, the second bearing 9 is mounted in the second end cap 7, and the plastic enclosure 4 is encapsulated in the stator, the rotor 3 and the first by using BMC plastic sealing material. Outside the end cap 6, the second end cap 7 is mounted to the end of the plastic enclosure 4 remote from the first end cap 6. The rotor 3 is mounted on the rotating shaft 5 in an interference fit manner, so that the rotating shaft 5 can be rotated by the rotor 3 to achieve the purpose of outputting power outward.

[0035] The motor provided by the embodiment of the invention is preferably applied to the motor of the air-conditioning fan, so that the winding path of the stator winding 2 on the stator yoke 11 is shortened and the amount of enameled wire is reduced relative to the motor of the existing air-conditioning fan. The effect of reducing the loss of the stator winding 2 and improving the efficiency of the motor is obvious. Of course, in a specific application, the motor provided by the embodiment of the present invention can also be applied to other motors, such as motors of household appliances such as range hoods, washing machines, and clothes dryers.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] The stator core includes a stator yoke and a plurality of stator teeth disposed on the stator yoke, and an arcing groove is formed between any two adjacent stator teeth, and the stator yoke has two a reversely disposed axial end portion, wherein: at least one of the axial ends is further recessed with a number of wire grooves equal to the number of the drop grooves, and each of the wire grooves and each of the wires The drop grooves are respectively disposed opposite to each other, and the stator yoke has a radial partition portion which is disposed between the opposite wire groove and the drop groove, and is disposed at two adjacent wires. Circumferential partition between slots

[Claim 2] The stator core according to claim 1, comprising: two half-core splits that are joined to each other end to end, the half-core splits are stacked in the axial direction by at least two punches Pressed into.

[Claim 3] The stator core according to claim 2, wherein: the half core split body is formed by laminating a plurality of first punching pieces and a plurality of second punching pieces, each of said a punching sheet is sequentially laminated to form a laminated body, each of the second punching sheets being laminated on the same side of the laminated body; or each of the second punching sheets is respectively laminated on the laminated main body On both sides.

[Claim 4] The stator core according to claim 3, wherein: one side of the first punching piece is spaced apart from each other by a plurality of first opening grooves, and two sides of the second punching piece are respectively a plurality of second slot slots and a plurality of third slot slots are provided, and the number of the second slot slots and the number of the third slot slots are the same as the number of the first slot slots And each of the second port slots is disposed opposite to each of the third port slots, and each of the first port slots and each of the second port slots are axially stacked to form the drop The wire trough, each of the third port grooves is axially stacked to form the wire trough.

[Claim 5] The stator core according to claim 4, wherein: the first punching piece includes a first yoke piece and a plurality of first tooth pieces protruding from a side of the first yoke piece Forming, by the two adjacent first teeth, a first slot; the second punching piece comprises a second yoke and a plurality of protrusions on a side of the second yoke a second tooth piece, the second yoke piece includes a half-circumferential yoke piece and a number of convex yoke pieces having the same number as the second tooth piece, and the second tooth piece and the convex yoke piece are respectively protruded from each other in two One of the second grooving grooves is formed between the two sides of the half-circumferential yoke, and any two adjacent yokes are adjacent to each other. One of the third port slots is formed between them.

The stator core according to any one of claims 1 to 5, wherein: each of said stator teeth is enclosed in a circumferential direction to form a hollow inner hole through which the rotor is bored, and said drop groove includes said hollow a notch of the inner hole, a groove body away from the hollow inner hole, and a groove between the notch and the groove body, the notch being oriented along the hollow inner hole in a gradually increasing width The side of the slot shoulder extends obliquely, and the slot shoulder extends obliquely along the slot toward the side of the slot body in a gradually increasing width.

The stator core according to claim 6, wherein: the number of the drop grooves is sixteen, and the inner diameter of the hollow inner hole is Φ47 ηιηι - Φ49ιηιη, and the outer diameter of the stator yoke is Φ74. Mm -084mm=

A stator core according to claim 7, wherein: said stator teeth include wide teeth and narrow teeth having a width smaller than said wide tooth width, and said wide teeth and said narrow teeth are alternately distributed in the circumferential direction. The width of the wide tooth is 4.0 mm to 4.5 mm, the width of the narrow tooth is 3.0 mm to 3.5 mm, and the width of the notch is close to one end of the hollow inner hole. The width of one end of the notch near the shoulder is 1.8m~2.0mm; the radial extension of the notch is 0.5mm~0.8mm, the diameter of the groove is 1.7mm~1.9mm The extending height is 0.45 mm to 0.65 mm, and the radial extending height of the radial partition portion is 1.0 mm to 6.0 mm.

A stator comprising: the stator core according to any one of claims 1 to 8 and a stator winding wound around the stator yoke.

An electric machine comprising: the stator of claim 9 and a rotor mated with the stator.