CN218633467U

CN218633467U - Straight strip type stator punching sheet, stator and motor

Info

Publication number: CN218633467U
Application number: CN202222414338.4U
Authority: CN
Inventors: 肖胜宇; 陈彬; 陈晓森; 蔡易霖; 张家旺
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-03-14
Anticipated expiration: 2032-09-09

Abstract

The utility model provides a straight bar type stator punching sheet, a stator and a motor, wherein the straight bar type stator punching sheet is arranged in the arranging production process to produce a plurality of stator punching sheet units, and the plurality of stator punching sheet units comprise a first stator punching sheet unit and a second stator punching sheet unit; one end of the first stator tooth is connected to the first stator yoke part, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit, one end of the second stator tooth is connected to the second stator yoke part, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit, and the first stator yoke part and the second stator yoke part are connected; the end face, opposite to the first stator tooth, of the first stator yoke is a second end face; the end face, opposite to the second stator teeth, of the second stator yoke is a fourth end face; the second end face and the fourth end face are matched and are mutually attached. According to the utility model discloses can effectively save the scrap (bridge bf 2) between the original every group stator punching sheet, improve the utilization ratio to the material, reduce the stator cost.

Description

Straight strip type stator punching sheet, stator and motor

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to straight strip type stator is towards piece, stator and motor.

Background

Cost reduction is one of important targets of motor research and development, the electromagnetic technology in the field of the existing fan motor is mature, the homogeneity of products of various manufacturers is serious, and the purpose of cost reduction is difficult to achieve from optimization of an electromagnetic scheme, so that the improvement of the material utilization rate of the motor by reducing production process waste becomes a main cost reduction route.

The prior art stator forms generally fall into 4 categories: round, block, coil, straight strip. The material utilization rate of the round stator is low, and the winding speed is low; each stator unit of the segmented stator needs to be wound independently, the number of wire ends processed after splicing is large, the working procedures are multiple and complex, and the rounding precision is low; the structure of the coiled stator is complex, and the process difficulty is high; the straight bar type stator has comprehensive advantages in all aspects, so the straight bar type stator is most widely applied to fan motors.

As shown in fig. 1, a conventional stator core is generally in an opposite-insertion type, that is, two rows of stator punching teeth are alternately inserted into one group and are simultaneously punched. According to the shape of a traditional stator core, two overlap edges are reserved during stock layout, wherein one overlap edge is reserved between two rows of stator punching sheets in one group and has the width bf1, the other overlap edge is reserved between two groups and has the width bf2, and the material utilization rate of one row of stator punching sheets is increased

The stator punching sheet comprises = V1 x 2/L1/(b 1+ hj1+ bf1+ bf 2), L1= (Z1 + 0.5) × L4+ (6-9 mm), wherein V1 is the practical area of the traditional stator punching sheet, b1 is the width of the stator punching sheet, L1 is the width of a stock layout, Z1 is the number of teeth of a stator core, L4 is the tooth pitch, hj1 is the height of a yoke part, and therefore the material utilization rate of the stator punching sheet can be greatly improved by eliminating overlap and shortening the tooth pitch of the stator core.

Because stator among the prior art need reserve the scrap (bridge) and lead to having material utilization rate low grade technical problem when punching the stock layout, consequently the utility model discloses research and design out a vertical bar formula stator punching, stator and motor.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the stator among the prior art and need reserve the scrap (bridge) and lead to having the defect that material utilization is low when going to the sheet stock layout to a straight strip stator is towards piece, stator and motor are provided.

In order to solve the above problem, the utility model provides a straight strip type stator punching sheet, it includes:

the straight strip type stator punching sheet is arranged in a layout manufacturing process to manufacture a plurality of stator punching sheet units, the structures of the plurality of stator punching sheet units are the same, and the plurality of stator punching sheet units comprise a first stator punching sheet unit and a second stator punching sheet unit;

the first stator punching unit comprises a first stator tooth and a first stator yoke, one end of the first stator tooth is connected to the first stator yoke, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit, the second stator punching unit comprises a second stator tooth and a second stator yoke, one end of the second stator tooth is connected to the second stator yoke, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit, and the first stator yoke is connected with the second stator yoke;

the end face, provided with the first stator teeth, of the first stator yoke part is a first end face, and the end face opposite to the first stator teeth is a second end face; the end face, provided with the second stator teeth, of the second stator yoke part is a third end face, and the end face opposite to the second stator teeth is a fourth end face; the second end face and the fourth end face are matched and mutually attached.

In some embodiments, the stator punching device further comprises a third stator punching unit, and the third stator punching unit, the first stator punching unit and the second stator punching unit are sequentially connected;

the third stator punching unit comprises a third stator tooth and a third stator yoke, one end of the third stator tooth is connected to the third stator yoke, the other end of the third stator tooth extends towards the first stator yoke and is connected with the first stator yoke; the first stator teeth extend towards the third stator yoke part and are arranged in a connection mode with the third stator yoke part;

the end face of the third stator yoke portion, on which the third stator teeth are arranged, is a fifth end face, and the end face opposite to the third stator teeth is a sixth end face; the free end face of the first stator tooth is matched with the fifth end face and is mutually attached, and the free end face of the third stator tooth is matched with the first end face and is mutually attached.

In some embodiments, the number of the first stator punching units is multiple, the multiple first stator punching units are sequentially connected to form the straight bar stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure.

In some embodiments, the number of the second stator punching units is multiple, and the second stator punching units are sequentially connected; the number of the third stator punching units is multiple, and the multiple third stator punching units are sequentially connected; the first stator teeth are inserted between two adjacent third stator teeth, and the third stator teeth are inserted between two adjacent first stator teeth to form a plug-in type layout structure.

In some embodiments, a free end face of the first stator tooth is a first arc face, the fifth end face of the third stator yoke is a second arc face, and the first arc face is in abutting contact with the second arc face; the free end face of the third stator tooth is a third cambered surface, the first end face of the first stator yoke is a fourth cambered surface, and the third cambered surface is attached to the fourth cambered surface.

In some embodiments, the first arc surface is a concave arc surface and the second arc surface is a convex arc surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface.

In some embodiments, the second end face of the first stator yoke is a straight plane and the fourth end face of the second stator yoke is a straight plane at the time of stock layout.

In some embodiments, a sunken groove is formed in the second end face of the straight-bar stator punching sheet at the joint of two adjacent first stator yoke portions, and the depth of the sunken groove is t3.

In some embodiments, the first stator yoke is provided with a yoke inner surface boss protruding outward on the first end surface, and a height of the yoke inner surface boss from the first end surface is a yoke inner surface boss height h2.

In some embodiments, a maximum distance between the second end face of the first stator yoke portion and a free end face of the first stator tooth along a centerline direction of the first stator tooth is a stator core width b2, and a distance between a tooth root and a tooth tip of the first stator tooth at the centerline of the first stator tooth is a tooth length L5; the distance between the joint position of the first end surface and the boss on the inner surface of the yoke and the second end surface along the middle line direction of the first stator tooth is the yoke height hj2;

the above parameters satisfy the following relations: t3= b2+ h2-L5-hj2.

In some embodiments, the yoke inner surface bosses of two adjacent first stator yokes are provided with connecting grooves at joints by means of recessing, and the connecting grooves are opposite to the sunken grooves and the minimum distance between the connecting grooves is a yoke connecting height h1.

In some embodiments, a tooth pitch between two adjacent first stator punching sheet units is L3, where L3 is a distance between center lines of two adjacent first stator teeth, a distance between a meeting position of the second end surface and the sunken groove and a circle center along a radial direction in the annular stator punching sheet structure is a stator radius R, a tooth number of the first stator teeth is a stator core tooth number Z1, and the above parameters satisfy the following relation:

L3＝2*(R-h1-t3)*tan(180°/Z1)。

in some embodiments, the layout width of the straight bar type stator punching sheet is L2, L2 is a length that the first stator punching units are sequentially connected, the number of teeth of the first stator teeth is a stator core tooth number Z1, a tooth pitch between two adjacent first stator punching units is L3, L3 is a distance between central lines of two adjacent first stator teeth, and the above parameters satisfy the following relations: l2= (Z1 + 0.5) × L3+ (6-9 mm).

In some embodiments, a process groove is disposed on the free end surface of the first stator tooth, the width of the process groove is b3, and the depth t1= 0.2-0.3 mm.

In some embodiments, along a center line direction of the first stator tooth, a maximum distance between the second end surface of the first stator yoke portion and a free end surface of the first stator tooth is a width b2 of the stator core, a distance between a tooth root and a tooth tip of the first stator tooth at the center line of the first stator tooth is a tooth length L5, a number of teeth of the first stator tooth is a stator core tooth number Z1, and the following relationship is satisfied: b3=2 (b 2+ h2-L5-t3-h 1) tan (180 °/Z1).

In some embodiments, a first protrusion is convexly arranged on the first stator yoke portion of the first stator punching unit at the head end toward the first stator yoke portion of the first stator punching at the tail end, a first groove is arranged on the first stator yoke portion of the first stator punching unit at the tail end toward the direction away from the first stator yoke portion of the first stator punching at the head end, and the first protrusion can be inserted into the first groove to form a clamping connection.

In some embodiments, the first protrusion is an arc protrusion, the first groove is an arc groove, the width of the arc protrusion in a direction perpendicular to the first end surface is b4, the distance between the first end surface and the second end surface of the first stator yoke portion is a yoke height hj2, the number of teeth of the first stator tooth is a stator core tooth number Z1, and the following relationship is satisfied: b4= (20% to 40%) (hj 2+ h 2)/tan (180 °/Z1).

In some embodiments, a second protrusion is convexly arranged on the second end surface of the first stator yoke of the first stator punching unit at the head end in a direction away from the first end surface, a third protrusion is convexly arranged on the second end surface of the first stator yoke of the first stator punching unit at the tail end in a direction away from the first end surface, a position where the first protrusion is connected with the first groove is between the first end surface and the first protrusion, and a surface where the two first stator yokes are opposite and connected is a first connecting surface; the side surface of the second protrusion is connected with the side surface of the third protrusion to form a second connection surface, the second connection surface and the first connection surface are located on different surfaces, and the second connection surface is close to the first stator tooth at the head end relative to the first connection surface.

In some embodiments, the first contact surface and the second contact surface both pass through the center of the annular stator lamination structure, and a center included angle formed by the first contact surface and the second contact surface is α; the protruding height of the second protrusion is the same as that of the third protrusion, and is h3, and h3= 0.2-0.5 mm.

In some embodiments, the first stator tooth includes a stator tooth body and pole shoes, one end of each pole shoe is connected to a circumferential side of the stator tooth body and is farthest away from the first stator yoke portion, and the other end of each pole shoe extends in the circumferential direction, and the two pole shoes are arranged in one-to-one correspondence with two circumferential sides of the stator tooth body;

the protrusion is provided with first knot point on the terminal surface of stator tooth main part, the both sides of first knot point all are provided with the preformed groove, the degree of depth of preformed groove is t2, the protrusion is provided with the second knot point on the terminal surface of first stator yoke portion.

In some embodiments, the stator tooth body has a circumferential width of tooth width bt and satisfies the relationship: t2= (1% -2%) btt/2.

In some embodiments, after forming the annular stator lamination structure, the first stator tooth is located radially inside the first stator yoke portion, i.e., the stator core for the inner rotor motor.

The utility model also provides a stator, it includes preceding arbitrary straight strip stator towards the piece.

The utility model also provides a motor, it includes aforementioned stator.

The utility model provides a pair of straight strip type stator punching sheet, stator and motor have following beneficial effect:

1. the utility model discloses a with a plurality of stator punching sheet units of straight strip stator punching sheet in the stock layout preparation process all the same, and the first stator yoke portion of first stator punching sheet unit and the second stator yoke portion laminating design of second stator punching sheet unit, and the second terminal surface of first stator yoke portion and the fourth terminal surface of second stator yoke portion mutual adaptation and laminating each other, can effectively save the butt up bf2 between the original every group stator punching sheet, save this part butt up structure, make the relative terminal surface adaptation of two sets of stator yoke portions and laminate each other, can improve the utilization ratio to the material effectively, namely the preferred yoke portion surface of straight strip stator punching sheet is a straight face, during the stock layout, need not to reserve the butt up between every group stator punching sheet, improve the material utilization ratio, reduce the stator cost; the utility model discloses still through mutually supporting and laminating the free end terminal surface of the first stator tooth of first stator punching unit and the fifth end of the third stator yoke portion of third stator punching unit, the free end terminal surface of third stator tooth and the first end of first stator yoke portion mutually support and laminate, can effectively save the overlap bf1 that reserves between two rows of stator punching sheets in original a set of, can further improve the utilization ratio to the material, promptly the utility model discloses the interior diametral plane of straight strip formula stator punching sheet is laminating with the yoke portion internal surface and is arranging the appearance, need not to reserve the overlap between two rows of stator punching sheets, improves material utilization ratio, reduces stator cost;

2. the utility model discloses the upper side of yoke portion junction of straight strip formula stator punching is equipped with the undercut, can effectively shorten the tooth pitch of adjacent stator unit to shorten stator punching and arrange the appearance material width, improve material utilization, reduce stator cost, solved stator punching and arrange the appearance material width longer and the problem that the material utilization is low that leads to of stator punching;

3. the utility model discloses stator punching sheet inner diameter face is equipped with the technology groove, in the stamping process, makes machine oil better permeate to the punching sheet material in, prevents cutter and punching sheet damage, has solved the stator and has leaded to the problem that cutter and punching sheet damage easily when punching press; the process groove can prevent slender excess materials from being left at the corner after the punching of the stator punching sheet, avoids secondary processing, and solves the problem that the excess materials are left at the corner after the punching of the stator punching sheet and secondary processing is needed; the process groove also has weakening effect on the cogging torque and the torque ripple of the motor, and solves the problems of large cogging torque and large torque ripple of the motor;

4. the utility model discloses a straight strip stator core both sides overlap joint department is equipped with assorted circular arc arch and circular arc recess respectively, can effectively avoid the straight strip stator core to take place the phenomenon of fracture after becoming the circle (the breach of current structure is a straight line, the welding atress is easy to split; the utility model discloses through protruding and recess cooperation and form the skew angle in the stamping process, so the breach is not a straight line, so be difficult to split), can effectively guarantee stator core's rounding precision, solve the stator core and produce the problem that the stator circularity is low that the fracture leads to easily after becoming the circle;

5. the utility model discloses a stator core becomes the circle after, has convex structure outside the lap mouth, this is favorable to welding process, and welding process has only one step, and production efficiency is high, has solved stator core and has become the circle after welding process more, problem that production efficiency is lower; the reserved grooves are formed in two sides of the buckling point position of the tooth part of the stator punching sheet, so that the tooth width size does not exceed the tolerance range after the buckling point is punched, the product percent of pass is improved, and the problem that the tooth width size of the stator is increased after the buckling point is punched by the stator punching sheet is solved;

6. the utility model discloses a stator core tooth portion is inboard in yoke portion, and inner rotor motor stator core is used promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor, has solved stator core and has become the circle after, and the notch width is too big, leads to the problem of motor performance reduction.

Drawings

Fig. 1 is a layout structure view of a conventional straight bar type stator core;

fig. 2 is a layout structure diagram of the straight bar type stator core of the present invention;

FIG. 2a is a partial enlarged view of the portion O in FIG. 2;

fig. 3 is a round structure diagram of the straight bar type stator core of the present invention;

fig. 4 is a partially enlarged view of the straight bar type stator core of the present invention;

FIG. 4a is an enlarged partial view of the yoke joint (at A) of FIG. 4;

FIG. 4b is an enlarged partial view of the yoke joint (at E) of FIG. 4;

fig. 5 is a partially enlarged view of the straight bar type stator core of the present invention at the lap joint;

FIG. 5a is an enlarged partial view of the lap (at B) of FIG. 5;

fig. 6 is a structural diagram of connection of two stator punching units when a conventional straight bar type stator core has no process slot and no yoke boss;

fig. 6a is a partial enlarged view of portion C of fig. 6;

fig. 6b is a partially enlarged view of a portion D of fig. 6.

The reference numbers are given as:

101. a first stator punching unit; 102. the second stator punching sheet unit; 1. a first stator tooth; 2. a first stator yoke; 21. a first end face; 22. a second end face; 3. a second stator tooth; 4. a second stator yoke; 41. a third end face; 42. a fourth end face; 103. a third stator punching unit; 5. a third stator tooth; 6. a third stator yoke; 61. a fifth end face; 62. a sixth end surface; 7. sinking the tank; 8. a boss on the inner surface of the yoke part; 9. connecting grooves; 10. a process tank; 11. a first protrusion; 12. a first groove; 13. a second protrusion; 14. a third protrusion; 15. a first junction surface; 16. a second contact surface; 17. a stator tooth body; 18. a pole shoe; 191. a first buckling point; 192. a second fastening point; 20. reserving a groove; 20a, elongated remnants.

Detailed Description

As shown in fig. 2-6, the utility model provides a straight strip type stator punching sheet, it includes:

the straight strip type stator punching sheet is subjected to layout manufacturing on a plurality of stator punching sheet units simultaneously in the layout manufacturing process, the structures of the plurality of stator punching sheet units are the same, and the plurality of stator punching sheet units comprise a first stator punching sheet unit 101 and a second stator punching sheet unit 102;

the first stator punching unit 101 comprises a first stator tooth 1 and a first stator yoke 2, one end of the first stator tooth 1 is connected to the first stator yoke 2, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit 102, the second stator punching unit 102 comprises a second stator tooth 3 and a second stator yoke 4, one end of the second stator tooth 3 is connected to the second stator yoke 4, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit 101, and the first stator yoke 2 is connected with the second stator yoke 4;

the end face of the first stator yoke 2, on which the first stator tooth 1 is arranged, is a first end face 21, and the end face opposite to the first stator tooth 1 is a second end face 22; the end surface of the second stator yoke 4 on which the second stator teeth 3 are arranged is a third end surface 41, and the end surface opposite to the second stator teeth 3 is a fourth end surface 42; the second end surface 22 and the fourth end surface 42 are matched and attached to each other.

The utility model discloses a with a plurality of stators of vertical bar stator punching sheet in stock layout manufacturing process towards the piece unit homoenergetic, and the first stator yoke portion of first stator punching sheet unit and the second stator yoke portion design of laminating mutually of second stator punching sheet unit, and the second terminal surface of first stator yoke portion and the mutual adaptation of fourth terminal surface of second stator yoke portion and laminate mutually, can effectively save the border bf2 of taking between the original every group stator punching sheet, save this part border structure, make the relative terminal surface adaptation of two sets of stator yoke portions and laminate each other, can improve the utilization ratio to the material effectively, the preferred vertical bar stator punching sheet's yoke portion surface is a vertical plane promptly, during the stock layout, need not to reserve the border between every group stator punching sheet, improve the material utilization ratio, reduce the stator cost.

The utility model discloses a utility model point:

1. the outer surface of the yoke part of each straight strip type stator punching sheet is a straight surface, each group of stator punching sheets can be attached to perform layout, no overlap edge needs to be reserved between the stator punching sheets, and the material utilization rate is improved;

2. the inner diameter surface of the straight strip type stator punching sheet and the inner surface of the yoke portion can be attached to carry out opposite insertion and layout, no overlap edge needs to be reserved between two rows of stator punching sheets, and the material utilization rate is improved;

3. a sinking groove is arranged above the joint of the yoke parts of the straight strip type stator punching sheet, and the depth of the sinking groove satisfies the relation: t3= b2+ h2-L5-hj2, b2 is the width of the stator core, h2 is the height of the boss on the inner surface of the yoke, L5 is the tooth length, hj2 is the height of the yoke, other structures cannot be influenced under the condition of shortening the tooth pitch, the height of the yoke is not too small, the structural strength is prevented from being influenced, and the structural stability is ensured; the pitch of adjacent stator units satisfies the relation: l3=2 (R-h 1-t 3) tan (180 DEG/Z1), and the sink groove can effectively shorten the pitch of adjacent stator units, so that the sample width of the stator punching sheet is shortened, and the material utilization rate is improved;

4. the inner diameter surface of the stator punching sheet is provided with a process groove, and the width of the process groove meets the relation:

b3=2 (b 2+ h2-L5-t3-h 1) tan (180 DEG/Z1), b3 is the width of the process groove, h1 is the height of the joint of the yoke, the depth t1 of the process groove is = 0.2-0.3 mm, the depth ensures that the process chamfer is left in the process groove, and the process groove can effectively weaken the cogging torque and the torque pulsation of the motor and avoid secondary processing;

5. a boss is designed on the inner surface of the yoke part, the height h2 of the boss needs to be larger than the radius of a process chamfer, the chamfer is left on the boss, and slender excess materials are prevented from being left on two sides of a pole shoe after the stator punching sheet is punched, so that secondary processing is avoided;

6. the lap openings on the two sides of the straight bar type stator core are respectively provided with a circular arc protrusion and a circular arc groove which are matched with each other, and the width of the circular arc protrusion satisfies the relation formula: b4= (20% -40%) (hj 2+ h 2)/tan (180 °/Z1), and the phenomenon of cracking after the straight bar type stator iron core is rounded can be effectively avoided;

7. the part of the yoke part above the arc protrusion is deviated in the opposite direction of the arc protrusion, the part of the yoke part above the arc groove is deviated in the scheme of the notch of the arc groove, the two deviation angles are consistent, the two part of the yoke part are both designed with sharp-angled protrusions, so that the two part of the yoke part are both provided with a lapping opening outward protruding structure, the two protruding structures are consistent in height, h3= 0.2-0.5 mm, and the lapping opening outward protruding structure is beneficial to a welding process;

8. stator punching tooth portion detains some position both sides and is equipped with the preformed groove, and the preformed groove degree of depth satisfies the relational expression:

t2= (1% -2%) bt/2, and the tooth width dimension can be ensured not to exceed the tolerance range after stamping buckling points.

The utility model provides a following technical problem:

1. the problem of low material utilization rate caused by the need of reserving the lap during the stock layout of the stator punching sheet is solved;

2. the problem of low material utilization rate caused by long sample arrangement width of the stator punching sheet is solved;

3. the problem that a cutter and a punching sheet are easily damaged when the stator punching sheet is punched is solved;

4. the problem that the stator punching sheet needs to be subjected to secondary processing because excess materials are left at the rear corner after punching is solved;

5. the problems of large cogging torque and large torque pulsation of the motor are solved;

6. the problem of low roundness of the stator caused by easy cracking of the round stator core is solved;

7. the problems that the welding process is more and the production efficiency is lower after the stator core is rounded are solved;

8. the problem that the tooth width of the stator is increased after the stator punching sheet is punched to form a fastening point is solved;

9. the problem of stator core become the circle after, the notch width is too big, leads to motor performance to reduce is solved.

Problem to technical background, the utility model provides a no scrap (bridge) straight bar formula stator core of high material utilization, high rounding precision, concrete technical scheme is as follows:

1. the utility model discloses straight strip stator core of no scrap (bridge) is folded by a plurality of stator punching and is pressed and form, every the stator punching includes a plurality of stator unit that connect gradually, each the stator unit includes yoke portion, tooth portion and end terminal.

2. As shown in fig. 2, the inner diameter surface of the straight-bar stator punching sheet and the inner surface of the yoke portion can be attached to perform opposite insertion and layout, and no overlap is required to be reserved between two rows of stator punching sheets; the outer surface of the yoke part of the straight strip type stator punching sheet is a straight surface, each group of stator punching sheets can be attached to perform stock layout, no need of reserved overlap edges is needed between the stator punching sheets, the stock layout length can be greatly shortened by eliminating two overlap edges, and the material utilization rate of the stator punching sheets is improved.

In some embodiments, the stator punching device further comprises a third stator punching unit 103, and the third stator punching unit 103, the first stator punching unit 101 and the second stator punching unit 102 are sequentially connected;

the third stator punching unit 103 comprises a third stator tooth 5 and a third stator yoke 6, one end of the third stator tooth 5 is connected to the third stator yoke 6, and the other end of the third stator tooth extends towards the first stator yoke 2 and is connected with the first stator yoke 2; the first stator tooth 1 extends towards the third stator yoke 6 and is connected with the third stator yoke 6;

the end surface of the third stator yoke 6 on which the third stator teeth 5 are arranged is a fifth end surface 61, and the end surface opposite to the third stator teeth 5 is a sixth end surface 62; the free end face of the first stator tooth 1 is matched with the fifth end face 61 and attached to the fifth end face, and the free end face of the third stator tooth 5 is matched with the first end face 21 and attached to the first end face.

The utility model discloses still through the free end terminal surface of the first stator tooth with the first stator punching unit and the third stator towards the mutual adaptation of the fifth end of the third stator yoke portion of piece unit and laminating, the free end terminal surface of third stator tooth and the mutual adaptation of the first end of first stator yoke portion and laminating can effectively save the overlap bf1 that two rows of stators of original in a set of reserved towards the piece, can further improve the utilization ratio to the material, promptly the utility model discloses the interior diametral plane of straight strip formula stator towards the piece is laminating with the yoke portion internal surface and is arranging the appearance, need not to reserve the overlap between two rows of stator towards the piece, further improves material utilization ratio, further reduces the stator cost.

In some embodiments, the number of the first stator punching units 101 is multiple, the multiple first stator punching units are sequentially connected to form the straight bar stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure. This is the utility model discloses a preferred structural style of the stator punching sheet that straight strip formula stator punching sheet form becomes annular meets in order to form annular stator punching sheet structure through a plurality of first stator punching sheet unit head to press a plurality of annular stator punching sheet structure superposes into stator core structure as an organic whole.

In some embodiments, the number of the second stator punching units 102 is multiple, and the multiple second stator punching units are connected in sequence; the number of the third stator punching units 103 is multiple, and the multiple third stator punching units are sequentially connected; the first stator teeth 1 are inserted between two adjacent third stator teeth 5, and the third stator teeth 5 are inserted between two adjacent first stator teeth 1 to form a plug-in and socket sample-arranging structure. This is the utility model discloses a second stator is towards preferred structural style of piece unit and third stator towards piece unit, can produce a plurality of stators towards the piece unit simultaneously promptly in one row's stock layout, can form annular stator towards the piece structure after can be through pressing into the stator core structure, owing to effectively saved two rows of stator in a set of and towards the first scrap (bridge bf 1) of reserving between the piece and every group stator towards the piece second scrap (bridge) bf2 between the piece, consequently just can effectively improve the utilization ratio to the material, the cost of stator has been reduced.

In some embodiments, the free end surface of the first stator tooth 1 is a first arc surface, and the fifth end surface 61 of the third stator yoke 6 is a second arc surface, and the first arc surface and the second arc surface are in abutting contact; the end surface of the free end of the third stator tooth 5 is a third arc surface, the first end surface 21 of the first stator yoke 2 is a fourth arc surface, and the third arc surface is attached to the fourth arc surface;

the second end surface 22 of the first stator yoke 2 is a straight plane and the fourth end surface 42 of the second stator yoke 4 is a straight plane when a pattern is produced.

This is the utility model discloses a free end terminal surface of first stator tooth and the preferred structural style of fifth terminal surface form the cooperation of cambered surface promptly through the structure of cambered surface, can form the plane laminating through straight plane, and original scrap (bridge) is saved effectively to the homoenergetic, save material, improves material utilization, reduces the cost of stator.

In some embodiments, the first arc surface is a concave arc surface and the second arc surface is a convex arc surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface. This is the utility model discloses a preferred structural style of first cambered surface, second cambered surface, third cambered surface and fourth cambered surface can form unsmooth complex cambered surface structure.

In some embodiments, a sunken groove 7 is formed in the second end surface 22 of the straight-bar stator punching sheet at the joint of two adjacent first stator yoke portions 2, and the depth of the sunken groove 7 is t3. The utility model discloses a be equipped with the undercut above the yoke portion junction of straight strip formula stator punching, can effectively shorten the tooth pitch of adjacent stator unit to it is wide to shorten the stator punching row appearance material, improves material utilization, reduces the stator cost.

In some embodiments, the first stator yoke 2 is provided with a yoke inner surface boss 8 protruding outwards on the first end surface 21 (as shown in fig. 2a, the yoke inner surface boss 8 of the first stator yoke is an arc surface, the yoke inner surface boss is an arc inner surface protruding again on the first arc surface, the yoke inner surface boss 8 of the first stator yoke is connected with an arc free end surface (i.e. a third arc surface) of the third stator tooth 5 in a matching manner; the structures of the first stator lamination unit, the second stator lamination unit and the third stator lamination unit are the same as each other), and the height of the yoke inner surface boss 8 from the first end surface 21 is a yoke inner surface boss height h2. The utility model discloses a yoke portion internal surface is through designing the boss, and boss height h2 need be greater than technology chamfer radius, can stay the chamfer on the boss, as shown in fig. 6, can prevent that stator punching sheet punching press back pole shoe both sides from leaving long and thin clout 20a, avoids secondary operation.

In some embodiments, along a centerline direction of the first stator tooth 1 (i.e., a direction parallel to the centerline may be on the centerline, both belonging to the centerline direction, the same applies below), a maximum distance between the second end surface 22 of the first stator yoke 2 and a free end surface of the first stator tooth 1 is a stator core width b2, a distance between a tooth root and a tooth top of the first stator tooth 1 at the centerline of the first stator tooth 1 is a tooth length L5, and a distance between a position where the first end surface 21 meets the yoke inner surface boss 8 and the second end surface 22 along the centerline direction of the first stator tooth 1 is a yoke height hj2;

the above parameters satisfy the following relations: t3= b2+ h2-L5-hj2.

The utility model discloses a sink degree of depth satisfies the relational expression: t3= b2+ h2-L5-hj2, b2 is the width of the stator core, h2 is the height of the boss on the inner surface of the yoke portion, L5 is the tooth length, hj2 is the height of the yoke portion, so that other structures cannot be influenced under the condition of shortening the tooth pitch, the height of the yoke portion is not too small, the structural strength is prevented from being influenced, and the structural stability is ensured.

In some embodiments, the yoke inner surface bosses 8 of two adjacent first stator yokes 2 are provided with a connecting groove 9 at the joint by means of a recess, and the connecting groove 9 is opposite to the sunken groove 7 and the minimum distance between the sunken grooves 7 is a yoke connecting height h1.

In some embodiments, a pitch between two adjacent first stator lamination units 101 is L3, L3 is a distance between central lines of two adjacent first stator teeth 1, a radial direction in the annular stator lamination structure is followed, a distance between a connection position of the second end face (22) and the sunken groove (7) and a circle center of the annular stator lamination structure is a stator radius R, a tooth number of the first stator teeth 1 is a stator core tooth number Z1, and the above parameters satisfy the following relation: l3=2 (R-h 1-t 3) tan (180 °/Z1).

The utility model discloses a tooth pitch of adjacent stator unit satisfies the relational expression:

l3=2 (R-h 1-t 3) tan (180 °/Z1), the pitch of adjacent stator units can be effectively shortened by the sink grooves, and the larger t3, the smaller the pitch. The smaller the tooth pitch is, namely the shorter the length of the straight strip type stator punching sheet is, the shorter the sample arrangement width L2 is, so that the sample arrangement width of the stator punching sheet is shortened, and the material utilization rate is improved.

In some embodiments, the layout width of the straight bar type stator punching sheet is L2, L2 is a length that the first stator punching sheet units 101 are sequentially connected, the number of teeth of the first stator teeth 1 is a stator core tooth number Z1, a tooth pitch between two adjacent first stator punching sheet units 101 is L3, L3 is a distance between central lines of two adjacent first stator teeth 1, and the above parameters satisfy the following relations:

L2＝(Z1+0.5)*L3+(6～9mm)；

the material utilization of stator punching in the stock layout region is eta, and the practical area of stator punching in the stock layout region is V2, along the central line direction of first stator tooth 1, first stator yoke 2 second terminal surface 22 with the maximum distance between the free end face of first stator tooth 1 is stator core's width b2, first stator yoke 2 first terminal surface 21 extremely distance between the second terminal surface 22 is yoke height hj2, and above-mentioned parameter satisfies the following relational expression: η = V2 × 2/(L2 (b 2+ hj2+ h 2)).

As shown in fig. 4, the upper side of the yoke part combining part of the straight strip type stator punching sheet is provided with a sinking groove, the tooth pitch of adjacent stator units can be effectively shortened, so that the width of the sample arranging material of the stator punching sheet is shortened, the material utilization rate is improved, and the depth of the sinking groove meets the relational expression: t3= b2+ h2-L5-hj2, the pitch of adjacent stator units satisfies the relation:

l3=2 (R-h 1-t 3) tan (180 DEG/Z1), and the material width of the straight strip type stator punching sheet row meets the relation:

l2= (Z1 + 0.5) × L3+ (6-9 mm), and the material utilization rate eta of one row of stator punching sheets

= V2 x 2/L2/(b 2+ hj2+ h 2), R is the outer radius of the stator core, Z1 is the number of teeth of the stator core, and V2 is the practical area of the stator lamination; the material width can be effectively shortened, and the utilization rate of the material is effectively improved.

In some embodiments, a process groove 10 is disposed on the free end surface of the first stator tooth 1, and the width of the process groove 10 is b3.

The utility model discloses a stator is equipped with the technology groove towards piece inner diameter face, can make machine oil better permeate in towards the piece material in the stamping process, prevents cutter and towards piece damage; the process groove can prevent slender excess materials from being left at the rear corners of the punched stator punching sheet, and secondary processing is avoided (as shown in fig. 6, the corners after one punching are chamfers, and the excess materials can be left unless the punching is performed twice, and the process groove can leave the excess materials in the groove and does not influence normal use); the process slots also have a weakening effect on the cogging torque and the torque ripple of the motor (the stator pole shoe is slotted, namely the number of slots is increased, the cogging torque frequency is increased, and the amplitude is also reduced.

In some embodiments, along a direction of a center line of the first stator tooth 1, a maximum distance between the second end surface 22 of the first stator yoke portion 2 and a free end surface of the first stator tooth 1 is a stator core width b2, a distance between a tooth root and a tooth tip of the first stator tooth 1 at the center line of the first stator tooth 1 is a tooth length L5, a number of teeth of the first stator tooth 1 is a stator core tooth number Z1, and the following relationship is satisfied by the above parameters: b3=2 (b 2+ h2-L5-t3-h 1) tan (180 °/Z1), and the depth t1 of the process groove = 0.2-0.3 mm. The method meets the relational expression and the depth, can ensure that the process chamfer is remained in the process groove, can effectively weaken the cogging torque and the torque pulsation of the motor, and avoids secondary processing.

In some embodiments, a first protrusion 11 is convexly disposed on the first stator yoke 2 of the first stator punching unit at the head end toward the first stator yoke 2 of the last first stator punching, a first groove 12 is disposed on the first stator yoke 2 of the last first stator punching unit at the tail end toward the direction away from the first stator yoke 2 of the first stator punching, and the first protrusion 11 can be inserted into the first groove 12 to form a snap connection.

The utility model discloses a straight strip formula stator core both sides overlap mouth department and be equipped with assorted circular arc arch and circular arc recess respectively, can effectively avoid the phenomenon that takes place the fracture after straight strip formula stator core becomes the circle (current structure is not protruding and recess complex structure, and the breach is a straight line, and the welding atress is easy to split, the utility model discloses a arch and recess cooperation can form the skew angle at the punching press in-process, so the breach is not the straight line, so be difficult for splitting), guarantee stator core's the precision of becoming a circle. (the lap of the utility model refers to the split between the head and the tail yoke parts after the straight bar type stator iron core becomes round).

In some embodiments, the first protrusion 11 is an arc protrusion, the first groove 12 is an arc groove, the width of the arc protrusion in a direction perpendicular to the first end surface 21 is b4, the distance between the first end surface 21 and the second end surface 22 of the first stator yoke 2 is a yoke height hj2, the number of the first stator teeth 1 is a stator core teeth number Z1, and the following relationship is satisfied:

b4= (20% to 40%) (hj 2+ h 2)/tan (180 °/Z1). Satisfy above-mentioned relational expression and can make straight strip formula stator core become the circle after, the circular arc arch closely combines with the circular arc recess, increases bonding strength, can effectively avoid straight strip formula stator core to become the phenomenon that takes place the fracture after the circle, increases stator core's the precision of becoming the circle.

In some embodiments, the second end surface 22 of the first stator yoke 2 of the first stator punching unit at the head end is provided with a second protrusion 13 protruding in a direction away from the first end surface 21, the second end surface 22 of the first stator yoke 2 of the first stator punching unit at the tail end is provided with a third protrusion 14 protruding in a direction away from the first end surface 21, and a surface where the first protrusion 11 meets the first groove 12 is a first meeting surface 15 between the first end surface 21 and a position where the first protrusion 11 meets the first groove 12; the side surface of the second protrusion 13 is connected to the side surface of the third protrusion 14 to form a second contact surface 16, the second contact surface 16 is located on a different surface from the first contact surface 15, and the second contact surface 16 is located closer to the first stator tooth 1 at the head end than the first contact surface 15.

Stator core becomes the circle after, there is convex structure outside the joint, this is favorable to welding process, and welding process only one step, high production efficiency, the part yoke portion of the protruding top of circular arc is towards the bellied opposite direction skew of circular arc, the part yoke portion of circular arc recess top is towards the notch scheme skew of circular arc recess, two skew angles are unanimous, two parts yoke portion all designs the closed angle arch, make two parts yoke portion all have the joint outer convex structure, through forming the skew angle, can make the breach not be the straight line in the manufacturing process, so be difficult for splitting, stator core's preparation stability can be guaranteed.

In some embodiments, the first contact surface 15 and the second contact surface 16 both pass through the center of the annular stator lamination structure, and a center included angle formed by the two is α; the protruding height of the second protrusion 13 is the same as the protruding height of the third protrusion 14, and both are h3, and h3= 0.2-0.5 mm. The utility model discloses a two parts yoke portion all has the evagination structure of taking a mouthful, and two protrusion structure highly uniform take a mouthful evagination structure to be favorable to welding process.

In some embodiments, the first stator tooth 1 includes a stator tooth body 17 and pole shoes 18, one end of each pole shoe 18 is connected to a circumferential side of the stator tooth body 17 and is farthest away from the first stator yoke 2, and the other end of each pole shoe 18 extends in a circumferential direction, and two pole shoes 18 are provided and are arranged in one-to-one correspondence with two circumferential sides of the stator tooth body 17;

stator tooth main part 17's the protruding first knot point 191 that is provided with on the terminal surface, the both sides of first knot point 191 all are provided with preformed groove 20, the degree of depth of preformed groove 20 is t2, the protruding second knot point 192 that is provided with on the terminal surface of first stator yoke portion 2. The reserved grooves are formed in two sides of the buckling point position of the tooth part of each stator punching sheet, so that after the punching buckling point is guaranteed, the tooth width size does not exceed the tolerance range, the product percent of pass is improved (the buckling point is a structure formed by mutually buckling and pressing each punching sheet, positioning and connection among the punching sheets are realized, and a stator core is assembled) when the buckling point is punched, the material beside the punching sheet can be extruded, the size is increased, the tooth width is an important size, and the reserved grooves need to be cut.

In some embodiments, the stator tooth body has a circumferential width of tooth width bt and satisfies the relationship: t2= (1% -2%) btt/2. The two sides of the buckling point position of the tooth part of the stator punching sheet are provided with the reserved grooves, the depth of each reserved groove meets the above relational expression, and the tooth width size does not exceed the tolerance range after the buckling point is punched, so that a subsequent framework can be smoothly sleeved on the stator core.

In some embodiments, after forming the annular stator lamination structure, the first stator tooth 1 is located at the radial inner side of the first stator yoke portion 2, that is, the stator core for the inner rotor motor. Stator core tooth portion is inboard at yoke portion, and rotor motor is with stator core promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor.

The utility model also provides a stator, it includes preceding arbitrary the straight bar stator towards the piece.

The utility model discloses a beneficial effect of stator as follows:

1. the outer surface of the yoke part of each straight strip type stator punching sheet is a straight surface, and a lap edge is not required to be reserved between each group of stator punching sheets during stock layout, so that the material utilization rate is improved, and the stator cost is reduced;

2. the inner diameter surface of the straight strip type stator punching sheet and the inner surface of the yoke part can be attached to perform stock layout, and no overlap is required to be reserved between two rows of stator punching sheets, so that the material utilization rate is improved, and the stator cost is reduced;

3. the sunken grooves are formed above the joint of the yoke parts of the straight stator punching sheets, so that the tooth pitch of adjacent stator units can be effectively shortened, the sample arrangement width of the stator punching sheets is shortened, the material utilization rate is improved, and the stator cost is reduced;

4. the inner diameter surface of the stator punching sheet is provided with a process groove, so that engine oil can better permeate into punching sheet materials in the punching process, and damage to a cutter and the punching sheet is prevented; the process groove can prevent slender excess materials from being left at the rear corner of the punched stator punching sheet, and secondary processing is avoided; the process groove also has weakening effect on the cogging torque and the torque ripple of the motor;

5. the matched arc bulges and arc grooves are respectively arranged at the lap openings at the two sides of the straight bar type stator core, so that the cracking phenomenon of the straight bar type stator core after the rounding can be effectively avoided (the matching of the bulges and the grooves of the utility model can form an offset angle in the stamping process, so that the cracks are not straight lines, and are not easy to crack), and the rounding precision of the stator core is ensured;

6. after the stator core is rounded, a convex structure is arranged outside the lap opening, which is beneficial to the welding process, and the welding process is only one step, so that the production efficiency is high;

7. both sides of the buckling point position of the tooth part of the stator punching sheet are provided with the reserved grooves, so that the tooth width size does not exceed the tolerance range after the buckling point is punched, and the product percent of pass is improved.

8. Stator core tooth portion is inboard at yoke portion, and rotor motor is with stator core promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor.

The utility model also provides a motor, it includes aforementioned stator.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a straight strip formula stator punching sheet which characterized in that: the method comprises the following steps:

the straight strip type stator punching sheet is used for simultaneously performing layout manufacturing on a plurality of stator punching sheet units in the layout manufacturing process, the plurality of stator punching sheet units are identical in structure, and the plurality of stator punching sheet units comprise a first stator punching sheet unit (101) and a second stator punching sheet unit (102);

the first stator punching unit (101) comprises a first stator tooth (1) and a first stator yoke portion (2), one end of the first stator tooth (1) is connected to the first stator yoke portion (2), the other end of the first stator tooth extends towards the direction deviating from the second stator punching unit (102), the second stator punching unit (102) comprises a second stator tooth (3) and a second stator yoke portion (4), one end of the second stator tooth (3) is connected to the second stator yoke portion (4), the other end of the second stator tooth extends towards the direction deviating from the first stator punching unit (101), and the first stator yoke portion (2) is connected with the second stator yoke portion (4);

the end face, provided with the first stator teeth (1), of the first stator yoke (2) is a first end face (21), and the end face opposite to the first stator teeth (1) is a second end face (22); the end face, provided with the second stator teeth (3), of the second stator yoke (4) is a third end face (41), and the end face opposite to the second stator teeth (3) is a fourth end face (42); the second end face (22) and the fourth end face (42) are matched and are mutually attached.

2. The straight bar stator punching sheet of claim 1, characterized in that:

the stator punching device is characterized by further comprising a third stator punching unit (103), wherein the third stator punching unit (103), the first stator punching unit (101) and the second stator punching unit (102) are sequentially connected;

the third stator punching unit (103) comprises a third stator tooth (5) and a third stator yoke (6), one end of the third stator tooth (5) is connected to the third stator yoke (6), the other end of the third stator tooth extends towards the first stator yoke (2) and is connected with the first stator yoke (2); the first stator tooth (1) extends towards the direction of the third stator yoke part (6) and is connected with the third stator yoke part (6);

the end face, provided with the third stator teeth (5), of the third stator yoke (6) is a fifth end face (61), and the end face opposite to the third stator teeth (5) is a sixth end face (62); the free end face of the first stator tooth (1) is matched with the fifth end face (61) and attached to the fifth end face, and the free end face of the third stator tooth (5) is matched with the first end face (21) and attached to the first end face.

3. The straight bar stator lamination of claim 2, wherein:

the number of the first stator punching units (101) is multiple, the first stator punching units are sequentially connected to form the straight bar type stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure.

4. The straight bar type stator punching sheet of claim 3, characterized in that:

the number of the second stator punching units (102) is multiple, and the second stator punching units are sequentially connected; the number of the third stator punching units (103) is multiple, and the third stator punching units are sequentially connected; the first stator teeth (1) are inserted between two adjacent third stator teeth (5), and the third stator teeth (5) are inserted between two adjacent first stator teeth (1) to form a plug-in and socket-out structure.

5. The straight bar type stator punching sheet of claim 2, characterized in that:

the end face of the free end of the first stator tooth (1) is a first cambered surface, the fifth end face (61) of the third stator yoke (6) is a second cambered surface, and the first cambered surface is attached to the second cambered surface; the free end face of the third stator tooth (5) is a third cambered surface, the first end face (21) of the first stator yoke portion (2) is a fourth cambered surface, and the third cambered surface is attached to the fourth cambered surface.

6. The straight bar type stator punching sheet of claim 5, characterized in that:

the first cambered surface is a concave cambered surface, and the second cambered surface is a convex cambered surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface.

7. The straight bar stator lamination of claim 2, wherein:

the second end face (22) of the first stator yoke portion (2) is a straight plane and the fourth end face (42) of the second stator yoke portion (4) is a straight plane during stock layout manufacturing.

8. The straight strip type stator punching sheet according to claim 3, characterized in that:

a sunken groove (7) is formed in the second end face (22) at the joint of two adjacent first stator yoke portions (2) in the straight strip type stator punching sheet, and the depth of the sunken groove (7) is t3.

9. The straight bar stator lamination of claim 8, wherein:

first stator yoke portion (2) is in outwards be provided with yoke portion internal surface boss (8) convexly on first terminal surface (21), yoke portion internal surface boss (8) distance the height of first terminal surface (21) is yoke portion internal surface boss height h2.

10. The straight bar type stator punching sheet of claim 9, characterized in that:

the maximum distance between the second end face (22) of the first stator yoke part (2) and the free end face of the first stator tooth (1) along the direction of the middle line of the first stator tooth (1) is the width b2 of the stator core, and the distance between the tooth root and the tooth top of the first stator tooth (1) at the middle line of the first stator tooth (1) is the tooth length L5; the distance between the joint position of the first end face (21) and the yoke inner surface boss (8) and the second end face (22) along the midline direction of the first stator tooth (1) is a yoke height hj2;

the above parameters satisfy the following relations: t3= b2+ h2-L5-hj2.

11. The straight bar type stator punching sheet of claim 9, characterized in that:

the yoke inner surface boss (8) of two adjacent first stator yokes (2) are equipped with spread groove (9) in the junction, spread groove (9) with sink groove (7) relative and with the minimum distance between sink groove (7) is yoke joint height h1.

12. The straight bar stator lamination of claim 11, wherein:

the tooth pitch between two adjacent first stator punching units (101) is L3, and L3 is the distance between the central line of two adjacent first stator teeth (1), along radial direction in the annular stator punching structure, second terminal surface (22) with the distance between the position of meeting and the centre of a circle of heavy groove (7) is stator radius R, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and above-mentioned parameter satisfies the following relational expression: l3=2 (R-h 1-t 3) tan (180 °/Z1).

13. The straight bar type stator punching sheet of claim 9, characterized in that:

the stock layout width of straight strip type stator punching is L2, and L2 is a plurality of first stator punching unit (101) connects gradually's length, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and the tooth pitch between two adjacent first stator punching unit (101) is L3, and L3 is the distance between the central line of two adjacent first stator teeth (1), and above-mentioned parameter satisfies the following relational expression:

L2＝(Z1+0.5)*L3+(6～9mm)。

14. the straight bar stator lamination of claim 11, wherein:

a process groove (10) is formed in the free end face of the first stator tooth (1), the width of the process groove (10) is b3, and the depth t1= 0.2-0.3 mm of the process groove.

15. The straight bar stator lamination of claim 14, wherein:

along the central line direction of first stator tooth (1), the biggest distance between the second terminal surface (22) of first stator yoke portion (2) and the free end face of first stator tooth (1) is stator core's width b2, the central line department of first stator tooth (1) the distance between the tooth root of first stator tooth (1) to the tooth top is tooth length L5, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and above-mentioned parameter satisfies following relation: b3=2 (b 2+ h2-L5-t3-h 1) tan (180 °/Z1).

16. The straight bar stator lamination of claim 9, wherein:

go towards first stator yoke portion (2) of the first stator punching sheet unit of head end the direction protrusion of first stator yoke portion (2) of terminal first stator punching sheet is provided with first arch (11), the first stator yoke portion (2) of terminal first stator punching sheet unit is faced towards and is deviated from the direction of first stator yoke portion (2) of the first stator punching sheet of head end is provided with first recess (12), first arch (11) can be inserted and establish the entering in first recess (12), form the joint.

17. The straight bar stator lamination of claim 16, wherein:

first arch (11) are the circular arc arch, first recess (12) are the circular arc recess, the circular arc is protruding along the perpendicular to the width of the direction of first terminal surface (21) is b4, first stator yoke portion (2) first terminal surface (21) extremely distance between second terminal surface (22) is yoke portion height hj2, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and above-mentioned parameter satisfies the following relational expression: b4= (20% to 40%) (hj 2+ h 2)/tan (180 °/Z1).

18. The straight bar stator lamination of claim 16, wherein:

a second protrusion (13) is convexly arranged on the second end face (22) of the first stator yoke (2) of the first stator punching unit at the head end in the direction away from the first end face (21), a third protrusion (14) is convexly arranged on the second end face (22) of the first stator yoke (2) of the first stator punching unit at the tail end in the direction away from the first end face (21), a position where the first protrusion (11) is connected with the first groove (12) is arranged between the first end face (21), and the opposite and connected faces of the two first stator yokes (2) are first connection faces (15); the side surface of the second protrusion (13) is connected with the side surface of the third protrusion (14) to form a second contact surface (16), the second contact surface (16) and the first contact surface (15) are located on different surfaces, and the second contact surface (16) is close to the first stator tooth (1) at the head end relative to the first contact surface (15).

19. The straight bar stator lamination of claim 18, wherein:

the first contact surface (15) and the second contact surface (16) respectively pass through the circle center of the annular stator punching sheet structure, and the included angle formed by the circle centers is alpha; the protruding height of the second protrusion (13) is the same as that of the third protrusion (14), and both the protruding height and the protruding height are h3, and h3= 0.2-0.5 mm.

20. The straight strip type stator punching sheet according to claim 3, characterized in that:

the first stator tooth (1) comprises a stator tooth main body (17) and two pole shoes (18), one end of each pole shoe (18) is connected to the circumferential side face of the stator tooth main body (17) and is farthest away from the first stator yoke part (2), the other end of each pole shoe extends towards the circumferential direction, and the two pole shoes (18) are arranged on two circumferential sides of the stator tooth main body (17) in a one-to-one correspondence mode;

the protruding first knot point (191) that is provided with on the terminal surface of stator tooth main part (17), the both sides of first knot point (191) all are provided with preformed groove (20), the degree of depth of preformed groove (20) is t2, the protruding second knot point (192) that is provided with on the terminal surface of first stator yoke portion (2).

21. The straight bar stator lamination of claim 20, wherein:

the circumferential width of the stator tooth main body is tooth width bt and satisfies the relational expression: t2= (1% -2%) btt/2.

22. The straight strip type stator punching sheet according to claim 3, characterized in that:

after forming annular stator lamination structure, first stator tooth (1) is located the radial inboard of first stator yoke portion (2), stator core for the inner rotor motor promptly.

23. A stator, characterized by: comprising a straight bar stator lamination as claimed in any one of claims 1 to 22.

24. An electric machine characterized by: comprising the stator of claim 23.