CN116111746A - Straight-bar stator punching sheet, stator and motor - Google Patents

Abstract

The invention provides a straight-bar stator punching sheet, a stator and a motor, wherein the straight-bar stator punching sheet is simultaneously subjected to layout manufacturing in the layout manufacturing process to manufacture 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, the other end of the first stator tooth extends towards the direction deviating from the second stator punching unit, 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 deviating from the first stator punching unit, and the first stator yoke is connected with the second stator yoke; the end face of the first stator yoke part, which is opposite to the first stator teeth, is a second end face; the end surface of the second stator yoke part, which is opposite to the second stator teeth, is a fourth end surface; the second end face and the fourth end face are matched and mutually attached. According to the invention, the overlapping edge bf2 between each group of original stator punching sheets can be effectively omitted, the utilization rate of materials is improved, and the cost of the stator is reduced.

Description

Straight-bar stator punching sheet, stator and motor

Technical Field

The invention relates to the technical field of motors, in particular to a straight-bar type stator punching sheet, a stator and a motor.

Background

The cost reduction is one of important targets for motor research and development, the electromagnetic technology in the field of fan motors is mature, products of various factories are seriously homogenized, and the purpose of cost reduction is difficult to achieve from electromagnetic scheme optimization, so that the material utilization rate of the motor is improved by reducing waste materials in the production process, and the method becomes a main cost reduction route.

The stator forms of the prior art are generally divided into 4 types: full circle, block, coiled, straight strip. The material utilization rate of the whole circular stator is low, and the winding speed is low; each stator unit of the segmented stator needs to be wound independently, the number of thread ends processed after splicing is large, the procedure is numerous and complex, and the rounding precision is low; the coiled stator has complex structure and high process difficulty; the straight bar stator has comprehensive advantages in the above aspects, so that the straight bar stator is most widely applied to fan motors.

As shown in fig. 1, the conventional stator core is generally a double-row pattern, i.e. two rows of stator punching teeth are interleaved to form a group, and are punched simultaneously. According to the shape of a traditional stator core, two overlapping edges must be reserved during the layout, wherein one overlapping edge is reserved between two rows of stator punching sheets in one group, the width of the overlapping edge is bf1, the other overlapping edge is reserved between each group, the width of the overlapping edge is bf2, and the material utilization rate of one row of stator punching sheets

The material utilization rate of the stator punching sheet can be greatly improved by eliminating the lapping edge and shortening the stator core tooth pitch because 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 the discharge material, Z1 is the number of teeth of the stator core, L4 is the tooth pitch and hj1 is the yoke height, =v1+hj1+bf1+bf2) = (Z1+0.5) ×L4+ (6-9 mm).

Because the technical problems of low material utilization rate and the like caused by reserved overlapping edges in the layout of the stator punching sheet in the prior art are solved, the invention designs a straight-bar stator punching sheet, a stator and a motor.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of low material utilization rate caused by the need of reserving the overlapping edge when the stator punching sheet is arranged in the prior art, thereby providing a straight-strip stator punching sheet, a stator and a motor.

In order to solve the above problems, the present invention provides a straight strip type stator punching sheet, comprising:

the straight strip type stator punching sheet is simultaneously subjected to pattern layout in the pattern layout manufacturing process to manufacture a plurality of stator punching sheet units, the structures of the stator punching sheet units are the same, and the 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 out towards the direction deviating 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 out towards the direction deviating from the first stator punching unit, and the first stator yoke is connected with the second stator yoke;

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

In some embodiments, the stator assembly further comprises a third stator punching unit, wherein 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, and the other end of the third stator tooth extends out towards the direction of the first stator yoke and is connected with the first stator yoke; the first stator teeth extend towards the direction of the third stator yoke part and are connected with the third stator yoke part;

The end face of the third stator yoke part, 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 mutually attached, and the free end face of the third stator tooth is matched with the first end face and mutually attached.

In some embodiments, the number of the first stator punching units is plural, the plural first stator punching units are sequentially connected to form the straight 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 second stator lamination unit is a plurality of, and the plurality of second stator lamination units are connected in sequence; the plurality of 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 opposite-insertion-and-discharge structure.

In some embodiments, the 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 fit connection 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 part is a fourth cambered surface, and the third cambered surface is in fit connection with the fourth cambered surface.

In some embodiments, the first arcuate surface is a concave arcuate surface and the second arcuate surface is a convex arcuate 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 patterning.

In some embodiments, the second end surface of the straight stator punching sheet at the joint of two adjacent first stator yokes is provided with a sinking groove, and the depth of the sinking groove is t3.

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

In some embodiments, along a midline direction of the first stator tooth, a maximum distance between the second end surface of the first stator yoke and a free end surface of the first stator tooth is a width b2 of a stator core, and a distance between a tooth root to a tooth top of the first stator tooth at the midline of the first stator tooth is a tooth length L5; along the direction of the central line of the first stator tooth, the distance between the joint position of the first end surface and the boss on the inner surface of the yoke part and the second end surface is the height hj2 of the yoke part;

The above parameters satisfy the following relation: t3=b2+h2-L5-hj 2.

In some embodiments, the yoke inner surface bosses of two adjacent first stator yokes are provided with a connection groove at the junction by way of a recess, the connection groove being opposite to the sink groove and the minimum distance between the connection groove and the sink groove being a yoke connection height h1.

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

L3＝2*(R-h1-t3)*tan(180°/Z1)。

in some embodiments, the straight strip type stator punching sheet has a layout width of L2, L2 is a length of sequentially connecting a plurality of first stator punching sheet units, the number of teeth of the first stator teeth is the number of teeth Z1 of the stator core, a tooth pitch between two adjacent first stator punching sheet units is L3, and L3 is a distance between midlines of two adjacent first stator teeth, where the foregoing parameters satisfy the following relation: l2= (z1+0.5) l3+ (6 to 9 mm).

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

In some embodiments, along the direction of the midline of the first stator tooth, the maximum distance between the second end surface of the first stator yoke and the free end surface of the first stator tooth is the width b2 of the stator core, the distance between the tooth root and the tooth top of the first stator tooth at the midline of the first stator tooth is the tooth length L5, the number of teeth of the first stator tooth is the number of teeth Z1 of the stator core, and the above parameters satisfy the following relation: b3 =2× (b2+h2-L5-t 3-h 1) ×tan (180 °/Z1).

In some embodiments, a first protrusion is provided on the first stator yoke of the first stator punching unit of the head end towards the direction of the first stator yoke of the first stator punching of the tail end in a protruding manner, a first groove is provided on the first stator yoke of the first stator punching unit of the tail end towards the direction of the first stator yoke of the first stator punching facing away from 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, a width of the arc protrusion along a direction perpendicular to the first end surface is b4, a distance between the first end surface and the second end surface of the first stator yoke is a yoke height hj2, a number of teeth of the first stator teeth is a number of teeth Z1 of the stator core, and the above parameters satisfy the following relation: b4 = (20% -40%) (hj2+h2)/tan (180 °/Z1).

In some embodiments, a second protrusion is convexly arranged on the second end face of the first stator yoke part of the first stator punching unit at the head end towards the direction away from the first end face, a third protrusion is convexly arranged on the second end face of the first stator yoke part of the first stator punching unit at the tail end towards the direction away from the first end face, and a first junction surface is formed between the junction position of the first protrusion and the first groove and the first end face and the opposite and junction surfaces of the two first stator yoke parts; the side surface of the second bulge is connected with the side surface of the third bulge to form a second connecting surface, the second connecting surface and the first connecting surface are positioned on different surfaces, and the second connecting surface is close to the first stator tooth at the head end relative to the first connecting surface.

In some embodiments, the first connecting surface and the second connecting surface respectively pass through the circle centers of the annular stator punching structures, and the included angle between the circle centers formed by the first connecting surface and the second connecting surface is alpha; the second bulges have the same protruding height as the third bulges, and the protruding heights of the second bulges and the third bulges are h3, and h3=0.2-0.5 mm.

In some embodiments, the first stator tooth includes a stator tooth body and a pole shoe, one end of the pole shoe is connected to a circumferential side surface of the stator tooth body and is located at a position farthest from the first stator yoke, the other end extends towards the circumferential direction, and the pole shoe has two pole shoes and is arranged in one-to-one correspondence with the circumferential two sides of the stator tooth body;

The stator tooth is characterized in that a first buckling point is arranged on the end face of the stator tooth main body in a protruding mode, reserved grooves are formed in two sides of the first buckling point, the depth of each reserved groove is t2, and a second buckling point is arranged on the end face of the first stator yoke in a protruding mode.

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

In some embodiments, after forming the annular stator lamination structure, the first stator teeth are located radially inward of the first stator yoke, i.e., the stator core for the inner rotor motor.

The invention also provides a stator, which comprises the straight strip type stator punching sheet.

The invention also provides a motor which comprises the stator.

The straight-bar stator punching sheet, the stator and the motor provided by the invention have the following beneficial effects:

1. according to the invention, the plurality of stator punching units in the process of layout production of the straight stator punching are identical, the first stator yoke part of the first stator punching unit is in fit design with the second stator yoke part of the second stator punching unit, the second end face of the first stator yoke part is mutually matched with the fourth end face of the second stator yoke part and mutually fit, so that the overlap bf2 between each group of original stator punching can be effectively omitted, the partial overlap structure is omitted, the opposite end faces of the two groups of stator yoke parts are mutually matched, the utilization rate of materials can be effectively improved, namely, the yoke outer surfaces of the optimized straight stator punching are a straight surface, the overlap is not required to be reserved between each group of stator punching during layout, the utilization rate of materials is improved, and the cost of the stator is reduced; according to the invention, the free end face of the first stator tooth of the first stator punching unit is mutually matched and attached with the fifth end of the third stator yoke of the third stator punching unit, the free end face of the third stator tooth is mutually matched and attached with the first end of the first stator yoke, the reserved lapping edge bf1 between two rows of stator punching in the original group can be effectively omitted, the utilization rate of materials can be further improved, namely, the inner diameter face of the straight stator punching is attached with the inner surface of the yoke for layout, the lapping edge is not required to be reserved between the two rows of stator punching, the utilization rate of materials is improved, and the cost of the stator is reduced;

2. The sinking groove is arranged 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 discharge width of the stator punching sheets is shortened, the material utilization rate is improved, the stator cost is reduced, and the problem of low material utilization rate caused by longer sample discharge width of the stator punching sheets is solved;

3. according to the stator punching sheet, the inner diameter surface of the stator punching sheet is provided with the process groove, so that engine oil better permeates into the punching sheet material in the punching process, the damage of a cutter and the punching sheet is prevented, and the problem that the cutter and the punching sheet are easily damaged when the stator punching sheet is punched is solved; the process groove can prevent the elongated leftovers from being left at the corners of the stator punched sheets, avoid secondary processing, and solve the problem that the leftovers are left at the corners of the stator punched sheets and need secondary processing; the process groove also has weakening effect on the cogging torque and the torque pulsation of the motor, so that the problems of large cogging torque and large torque pulsation of the motor are solved;

4. 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 phenomenon that the straight-bar type stator core is cracked after rounding (the existing structure is split into a straight line and is easy to crack when welding stress is applied;

5. After the stator core is rounded, the convex structure is arranged outside the lap joint, so that the welding process is facilitated, the welding process is only one step, the production efficiency is high, and the problems of more welding processes and lower production efficiency after the stator core is rounded are solved; the reserved grooves are arranged on two sides of the buckling point 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 qualification rate is improved, and the problem that the tooth width size of the stator is enlarged after the buckling point is punched by the stator punching sheet is solved;

6. the tooth parts of the stator core are arranged on the inner side of the yoke part, namely the stator core for the inner rotor motor, after the straight-bar type stator core is rounded, the width of the notch is ensured not to be too large, the performance of the motor is improved, and the problem that the performance of the motor is reduced due to the too large width of the notch after the stator core is rounded is solved.

Drawings

Fig. 1 is a diagram showing a layout structure of a conventional straight stator core;

fig. 2 is a layout structural view of the straight stator core of the present invention;

FIG. 2a is an enlarged view of a portion O of FIG. 2;

fig. 3 is a circular structure view of the straight stator core of the present invention;

fig. 4 is a partial enlarged view of the straight stator core of the present invention;

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

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

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

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

FIG. 6 is a diagram showing the connection of two stator lamination units of a conventional straight stator core without a process slot and a yoke boss;

FIG. 6a is an enlarged partial view of portion C of FIG. 6;

fig. 6b is a partial enlarged view of the portion D of fig. 6.

The reference numerals are expressed as:

101. a first stator punching unit; 102. a second stator lamination 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 face; 7. a sinking groove; 8. a yoke inner surface boss; 9. a connecting groove; 10. a process tank; 11. a first protrusion; 12. a first groove; 13. a second protrusion; 14. a third protrusion; 15. a first junction; 16. a second junction; 17. a stator tooth body; 18. pole shoes; 191. a first buckling point; 192. a second buckling point; 20. a reserved groove; 20a, slender remainder.

Detailed Description

As shown in fig. 2-6, the present invention provides a straight strip stator punching sheet comprising:

the straight strip type stator punching sheet is subjected to pattern drawing in the pattern drawing 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 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 out towards the direction away 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 out towards the direction away from the first stator punching unit 101, and the first stator yoke 2 is connected with the second stator yoke 4;

the end surface of the first stator yoke 2, on which the first stator teeth 1 are arranged, is a first end surface 21, and the end surface opposite to the first stator teeth 1 is a second end surface 22; the end surface of the second stator yoke 4 on which the second stator teeth 3 are provided 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 adapted and mutually attached.

According to the invention, the plurality of stator punching units in the process of layout production of the straight stator punching are identical, the first stator yoke part of the first stator punching unit is in fit design with the second stator yoke part of the second stator punching unit, the second end face of the first stator yoke part is mutually matched with the fourth end face of the second stator yoke part and mutually fit, the overlap bf2 between each group of original stator punching can be effectively omitted, the partial overlap structure is omitted, the opposite end faces of the two groups of stator yoke parts are mutually matched, the utilization rate of materials can be effectively improved, namely, the yoke outer surfaces of the optimized straight stator punching are a straight surface, the overlap is not required to be reserved between each group of stator punching during layout, the utilization rate of materials is improved, and the cost of the stator is reduced.

The invention is characterized in that:

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

2. the inner diameter surface of the straight stator punching sheet and the inner surface of the yoke part can be adhered to perform opposite-inserting sample arrangement, no overlap edge is reserved between the 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 stator punching sheet, and the depth of the sinking groove meets the relation: t3=b2+h2-L5-hj 2, 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 are not affected under the condition of shortening the tooth pitch, the height of the yoke is not too small, the structural strength is prevented from being affected, and the structural stability is ensured; the tooth pitch of adjacent stator units satisfies the relationship: l3=2 (R-h 1-t 3) tan (180 °/Z1), the sink can effectively shorten the tooth pitch of adjacent stator units, thereby shortening the sample width of stator punching sheet and improving the material utilization rate;

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 (b2+h2-L5-t 3-h 1) tan (180 °/Z1), b3 is the width of the process groove, h1 is the height of the joint of the yoke, and the depth t1=0.2-0.3 mm of the process groove ensures that the process chamfer is left in the process groove, and the process groove can effectively weaken the cogging torque and torque pulsation of the motor and avoid secondary machining;

5. the inner surface of the yoke part is provided with a boss, the height h2 of the boss is required to be larger than the radius of a technological chamfer, the chamfer is left on the boss, the slender surplus materials are prevented from being left on two sides of a pole shoe after stator punching is punched, and secondary processing is avoided;

6. The straight strip type stator core is provided with arc protrusions and arc grooves which are matched with each other at the lap openings on two sides of the straight strip type stator core, and the widths of the arc protrusions meet the relation: b4 (hj2+h2)/tan (180 degrees/Z1), which can effectively avoid cracking of the straight stator core after rounding;

7. the part of the yoke above the arc bulge is offset towards the opposite direction of the arc bulge, the part of the yoke above the arc groove is offset towards the notch scheme of the arc groove, the two offset angles are consistent, the two parts of the yoke are both designed with sharp angle bulges, so that the two parts of the yoke are both provided with a lap-top protruding structure, the heights of the two protruding structures are consistent, h3=0.2-0.5 mm, and the lap-top protruding structure is beneficial to the welding process;

8. the stator punching tooth buckling point positions are provided with reserved grooves on two sides, and the depth of each reserved groove meets the relation:

t2= (1% -2%). Bt/2, can guarantee that the tooth width size does not exceed the tolerance range after punching press knot.

The invention solves the following technical problems:

1. the problem of low material utilization rate caused by the need of reserving overlapping edges when the stator punching sheet is arranged is solved;

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

3. the problem that a cutter and a punching sheet are easy to damage when the stator punching sheet is punched is solved;

4. The problem that the leftover materials are left at the corners of the stator punched sheet and secondary processing is needed is solved;

5. the problem of large cogging torque and large torque pulsation of the motor is solved;

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

7. the problems of more welding procedures and lower production efficiency after the stator iron core is rounded are solved;

8. the problem that the tooth width of the stator is increased after the stator punching sheet punches the buckling point is solved;

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

Aiming at the technical background, the invention provides a straight strip type stator core without a lap, which has high material utilization rate and high rounding precision, and the technical proposal is as follows:

1. the straight strip type stator core without the overlapping edge is formed by laminating a plurality of stator punching sheets, each stator punching sheet comprises a plurality of stator units which are sequentially connected, and each stator unit comprises a yoke part, a tooth part and a pole shoe.

2. As shown in fig. 2, the inner diameter surface of the straight stator punching sheet and the inner surface of the yoke part can be adhered to each other to perform opposite-inserting pattern, and no overlap edge is required to be reserved between the two rows of stator punching sheets; 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 the yoke part for discharging, no overlap edges are needed to be reserved between the stator punching sheets, the length of the discharging materials can be greatly shortened by eliminating two overlap edges, and the utilization rate of the stator punching sheets is improved.

In some embodiments, the stator core further comprises a third stator core unit 103, wherein the third stator core unit 103, the first stator core unit 101 and the second stator core unit 102 are connected in sequence;

the third stator punching unit 103 includes 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 extends towards the direction of the first stator yoke 2 and is connected to the first stator yoke 2; the first stator teeth 1 extend toward the third stator yoke 6 and are connected with the third stator yoke 6;

the end surface of the third stator yoke 6 on which the third stator teeth 5 are provided 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 and mutually attached to the fifth end face 61, and the free end face of the third stator tooth 5 is matched with and mutually attached to the first end face 21.

According to the invention, the free end face of the first stator tooth of the first stator punching unit is mutually matched and attached with the fifth end of the third stator yoke of the third stator punching unit, the free end face of the third stator tooth is mutually matched and attached with the first end of the first stator yoke, the reserved scrap bf1 between two rows of stator punching in the original group can be effectively omitted, and the utilization rate of materials can be further improved, namely, the inner diameter face of the straight stator punching is attached with the inner surface of the yoke for layout, the scrap is not required to be reserved between the two rows of stator punching, the utilization rate of materials is further improved, and the cost of the stator is further reduced.

In some embodiments, the number of the first stator punching units 101 is plural, the plural first stator punching units are sequentially connected to form the straight stator punching, and the first stator punching unit at the head end is connected to the first stator punching unit at the tail end to form an annular stator punching structure. The stator core structure is characterized in that the stator core structure is formed by laminating a plurality of annular stator punching structures.

In some embodiments, the second stator punching units 102 are a plurality of, and the plurality of second stator punching units are connected in sequence; the number of the third stator punching units 103 is plural, and the plural 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 opposite-insertion-and-discharge structure. The second stator punching unit and the third stator punching unit are in a preferable structural form, namely a plurality of stator punching units can be manufactured simultaneously in a row of patterns, and the stator core structure can be formed by pressing after the annular stator punching structure is formed.

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 is in fit connection with the second arc surface; the end face of the free end of the third stator tooth 5 is a third cambered surface, the first end face 21 of the first stator yoke part 2 is a fourth cambered surface, and the third cambered surface is jointed with the fourth cambered 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 at the time of layout production.

The invention is a preferable structural form of the free end face and the fifth end face of the first stator tooth, the arc face is matched through the structure of the arc face, the plane joint can be formed through the straight plane, the original lapping can be effectively omitted, the material is saved, the material utilization rate is improved, and the cost of the stator is reduced.

In some embodiments, the first arcuate surface is a concave arcuate surface and the second arcuate surface is a convex arcuate surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface. The first cambered surface, the second cambered surface, the third cambered surface and the fourth cambered surface are optimized structural forms, and can form a concave-convex matched cambered surface structure.

In some embodiments, the second end surface 22 of the straight stator punching sheet at the joint of two adjacent first stator yokes 2 is provided with a sinking groove 7, and the depth of the sinking groove 7 is t3. According to the invention, the sinking groove is arranged above the joint of the yoke parts of the straight stator punching sheet, so that the tooth pitch of the adjacent stator units can be effectively shortened, the sample discharging width of the stator punching sheet is shortened, the material utilization rate is improved, and the cost of the stator is reduced.

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-shaped inner surface protruding again on the first arc surface, the yoke inner surface boss 8 of the first stator yoke is in fit connection with the arc-shaped free end surface (i.e. the third arc surface) of the third stator tooth 5, the structures of the first stator punching unit, the second stator punching unit and the third stator punching unit are all identical to each other), and the height of the yoke inner surface boss 8 from the first end surface 21 is the height h2 of the yoke inner surface boss. According to the invention, the boss is designed on the inner surface of the yoke part, the boss height h2 is required to be larger than the process chamfer radius, the chamfer can be left on the boss, as shown in fig. 6, the slender remainder 20a can be prevented from being left on two sides of the pole shoe after stator punching, and secondary processing is avoided.

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

the above parameters satisfy the following relation: t3=b2+h2-L5-hj 2.

The invention satisfies the relation by the depth of the sinking groove: t3=b2+h2-L5-hj 2, 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, and other structures can not be affected under the condition of shortening the tooth pitch, and the height of the yoke is ensured not to be too small, so that the structural strength is prevented from being affected, 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 connecting grooves 9 at the joints by way of recesses, the connecting grooves 9 being opposite to the sinking grooves 7 and the minimum distance between the connecting grooves 9 and the sinking grooves 7 being the yoke connection height h1.

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

The tooth pitch of adjacent stator units satisfies the relation: l3=2× (R-h 1-t 3) × (180 °/Z1), the pitch of adjacent stator units can be effectively shortened by the sink grooves, with a larger pitch t3 being smaller. The smaller the tooth pitch, namely the shorter the length of the straight strip type stator punching sheet, the shorter the discharge width L2, thereby shortening the discharge width of the stator punching sheet and improving the material utilization rate.

In some embodiments, the strip-shaped stator punching has a layout width of L2, L2 is a length of sequentially connecting the plurality of first stator punching units 101, the number of teeth of the first stator teeth 1 is the number of teeth Z1 of the stator core, the tooth distance between two adjacent first stator punching units 101 is L3, and L3 is a distance between the middle lines of two adjacent first stator teeth 1, where the above parameters satisfy the following relationship:

L2＝(Z1+0.5)*L3+(6～9mm)；

The material utilization rate of the stator punching sheet in the pattern discharging area is eta, the practical area of the stator punching sheet in the pattern discharging area is V2, the maximum distance between the second end face 22 of the first stator yoke 2 and the free end face of the first stator tooth 1 is the width b2 of the stator core along the center line direction of the first stator tooth 1, the distance between the first end face 21 of the first stator yoke 2 and the second end face 22 is the yoke height hj2, and the above parameters satisfy the following relation: η=v2×2/(l2×b2+hj2+h2).

As shown in fig. 4, a sinking groove is arranged above the joint of the yoke parts of the straight stator punching sheet, so that the tooth pitch of adjacent stator units can be effectively shortened, the sample discharging width of the stator punching sheet is shortened, the material utilization rate is improved, and the depth of the sinking groove meets the relation: t3=b2+h2-L5-hj 2, the pitch of adjacent stator units satisfies the relation:

l3=2 (R-h 1-t 3) tan (180 °/Z1), the linear stator sheet stock width satisfies the relationship:

l2= (z1+0.5) ×l3+ (6-9 mm), material utilization rate η of one row of stator punching sheets

=v2×2/L2/(b2+hj2+h2), 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 materials can be effectively improved.

In some embodiments, a process slot 10 is provided on the free end face of the first stator tooth 1, the width of the process slot 10 being b3.

According to the invention, the technical grooves are formed in the inner diameter surface of the stator punching sheet, so that engine oil can better permeate into the punching sheet material in the punching process, and damage to a cutter and the punching sheet is prevented; the process groove can prevent the elongated leftovers from being left at the corners of the stator punched sheet after punching, so that secondary processing is avoided (as shown in fig. 6, the corners of the stator punched sheet after punching are chamfer angles unless punching is performed twice, so that the leftovers are left, the process groove can leave the leftovers in the groove, and normal use is not affected); the process slots also have a weakening effect on the cogging torque and torque ripple of the motor (slotting in the stator pole shoes, corresponding to an increase in the number of slots, an increase in the number of cogging torque, and a decrease in the amplitude thereof).

In some embodiments, along the direction of the midline of the first stator tooth 1, the maximum distance between the second end face 22 of the first stator yoke 2 and the free end face of the first stator tooth 1 is the width b2 of the stator core, the distance between the tooth root and the tooth top of the first stator tooth 1 at the midline of the first stator tooth 1 is the tooth length L5, the number of teeth of the first stator tooth 1 is the number of teeth Z1 of the stator core, and the above parameters satisfy the following relation: b3 =2×2 (b2+h2-L5-t 3-h 1) ×tan (180 °/Z1), the depth t1 of the process tank=0.2 to 0.3mm. The method meets the relation and the depth, can ensure that the process chamfer is remained in the process groove, can effectively weaken the cogging torque and torque pulsation of the motor and avoid secondary processing.

In some embodiments, a first protrusion 11 is provided on the first stator yoke 2 of the first stator punching unit at the head end in a protruding manner towards the direction of the first stator yoke 2 of the first stator punching unit at the tail end, a first groove 12 is provided on the first stator yoke 2 of the first stator punching unit at the tail end in a direction away from the first stator yoke 2 of the first stator punching unit at the head end, and the first protrusion 11 can be inserted into the first groove 12 to form a clamping connection.

According to the invention, the matched arc bulges and arc grooves are respectively arranged at the lap openings at the two sides of the straight-bar stator core, so that the phenomenon that the straight-bar stator core is cracked after rounding (the existing structure is not a structure with the bulges and grooves matched, the cracks are straight lines, and the welding stress is easy to crack, and the bulges and the grooves matched in the stamping process can form offset angles, so that the cracks are not straight lines, and the cracks are not easy to crack) can be effectively avoided, and the rounding precision of the stator core is ensured. (the lap joint of the invention refers to the split between the head and tail yoke parts after the straight stator core is rounded).

In some embodiments, the first protrusion 11 is a circular arc protrusion, the first groove 12 is a circular arc groove, the width of the circular arc protrusion along the 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 the yoke height hj2, the number of teeth of the first stator tooth 1 is the number of teeth of the stator core Z1, and the above parameters satisfy the following relation:

b4 = (20% -40%) (hj2+h2)/tan (180 °/Z1). After the straight-bar type stator core is rounded, the circular arc protrusions and the circular arc grooves are tightly combined, so that the combination strength is increased, the phenomenon that the straight-bar type stator core cracks after rounding can be effectively avoided, and the rounding precision of the stator core is increased.

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

After the stator core becomes the circle, the structure that has the protrusion outside the lap mouth, this is favorable to welding process, and the welding process only has one step, production efficiency is high, the protruding top of circular arc part yoke portion is towards the protruding opposite direction skew of circular arc, the protruding notch scheme skew of circular arc recess is towards to the protruding partial yoke portion of circular arc recess, two offset angles are unanimous, two partial yoke portions all design the closed angle arch, make two partial yoke portions all have the structure of lap mouth protrusion outside, through forming offset angle, can make the breach not be sharp in the manufacturing process, so be difficult for splitting, stator core's preparation stability can have been guaranteed.

In some embodiments, the first contact surface 15 and the second contact surface 16 respectively pass through the center of the annular stator lamination, and an included angle between the center and the center is α; the protruding height of the second protrusion 13 is the same as that of the third protrusion 14, and is h3, and h3=0.2 to 0.5mm. The two parts of the yoke parts of the invention are provided with the lap-top outer convex structures, the heights of the two convex structures are consistent, and the lap-top outer convex structures are beneficial to the 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 surface of the stator tooth body 17 and is located at a position farthest from the first stator yoke 2, the other end extends towards the circumferential direction, and two pole shoes 18 are provided and are in one-to-one correspondence with the circumferential two sides of the stator tooth body 17;

The end face of the stator tooth main body 17 is provided with a first buckling point 191 in a protruding mode, two sides of the first buckling point 191 are provided with reserved grooves 20, the depth of each reserved groove 20 is t2, and the end face of the first stator yoke 2 is provided with a second buckling point 192 in a protruding mode. The stator punching tooth portion buckling point is provided with reserved grooves on two sides, after the punching buckling point is ensured, the tooth width size does not exceed the tolerance range, the product qualification rate is improved (the buckling point is a structure of buckling each punching piece, positioning and connection among the punching pieces are realized, and a stator core is assembled), and when the punching buckling point is punched, materials beside the stator punching tooth portion buckling point can be extruded, so that the size is enlarged, the tooth width is a relatively important size, and therefore the reserved grooves are needed to be cut.

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

In some embodiments, after forming the annular stator lamination, the first stator teeth 1 are located radially inward of the first stator yoke 2, i.e., the stator core for an inner rotor motor. The stator core tooth part is arranged on the inner side of the yoke part, namely the stator core for the inner rotor motor, and after the straight-bar stator core is rounded, the width of the notch is ensured not to be too large, and the performance of the motor is improved.

The invention also provides a stator, which comprises the straight strip type stator punching sheet.

The stator has the following beneficial effects:

1. the outer surface of the yoke part of each straight stator punching sheet is a straight surface, and during the layout, no overlap edge is reserved between each group of stator punching sheets, so that the material utilization rate is improved, and the cost of the stator is reduced;

2. according to the straight stator punching sheet, the inner diameter surface and the inner surface of the yoke part can be adhered to perform layout, overlapping edges are not required to be reserved between two rows of stator punching sheets, the material utilization rate is improved, and the stator cost is reduced;

3. the sinking groove is arranged above the joint of the yoke parts of the straight stator punching sheet, so that the tooth pitch of adjacent stator units can be effectively shortened, the sample discharging width of the stator punching sheet is shortened, the material utilization rate is improved, and the cost of the stator 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 the punching sheet material in the punching process, and the damage of a cutter and the punching sheet is prevented; the process groove can prevent elongated leftovers from being left at the corners of the stator punched sheet, so that secondary processing is avoided; the process groove also has weakening effect on cogging torque and torque pulsation 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 stator core, so that the phenomenon that the straight-bar stator core is cracked after rounding can be effectively avoided (the bulges and the grooves are matched to form an offset angle in the stamping process, so that the split is not straight, and the split is not easy to crack), and the rounding precision of the stator core is ensured;

6. After the stator iron core is rounded, a protruding structure is arranged outside the lap joint, which is favorable for the welding process, and the welding process has only one step, so that the production efficiency is high;

7. the reserved grooves are arranged on two sides of the buckling point 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, and the product qualification rate is improved.

8. The stator core tooth part is arranged on the inner side of the yoke part, namely the stator core for the inner rotor motor, and after the straight-bar stator core is rounded, the width of the notch is ensured not to be too large, and the performance of the motor is improved.

The invention also provides a motor which comprises the stator.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (24)

1. A straight strip type stator punching sheet is characterized in that: comprising the following steps:

The method comprises the steps that in the process of patterning, a plurality of stator punching units are patterned and manufactured simultaneously, the structures of the stator punching units are the same, and the stator punching units comprise a first stator punching unit (101) and a second stator punching 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 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 (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 deviating 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 part (2) provided with the first stator teeth (1) 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 of the second stator yoke part (4) provided with the second stator teeth (3) 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 mutually attached.

2. The straight strip stator lamination of claim 1, wherein:

the stator punching device further comprises 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 connected in sequence;

the third stator punching unit (103) comprises third stator teeth (5) and third stator yokes (6), one ends of the third stator teeth (5) are connected to the third stator yokes (6), and the other ends of the third stator teeth extend towards the direction of the first stator yokes (2) and are connected with the first stator yokes (2); the first stator teeth (1) extend towards the third stator yoke (6) and are connected with the third stator yoke (6);

the end face of the third stator yoke part (6) provided with the third stator teeth (5) 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 mutually attached, and the free end face of the third stator tooth (5) is matched with the first end face (21) and mutually attached.

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

The stator punching device comprises a plurality of first stator punching units (101), wherein the plurality of 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.

4. A straight strip stator lamination as defined in claim 3 wherein:

the number of the second stator punching units (102) is multiple, and the multiple second stator punching units are sequentially connected; 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 opposite-insertion-and-discharge structure.

5. The straight strip stator punching of any of claims 2-4, wherein:

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

6. The straight strip stator lamination of claim 5, wherein:

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 strip stator punching of any of claims 2-6, wherein:

the second end face (22) of the first stator yoke (2) is a straight plane, and the fourth end face (42) of the second stator yoke (4) is a straight plane at the time of layout production.

8. A straight strip stator lamination as defined in claim 3 wherein:

the second end face (22) of the joint of two adjacent first stator yokes (2) in the straight stator punching sheet is provided with a sinking groove (7), and the depth of the sinking groove (7) is t3.

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

the first stator yoke (2) is provided with a yoke inner surface boss (8) protruding outwards on the first end face (21), and the height of the yoke inner surface boss (8) from the first end face (21) is the yoke inner surface boss height h2.

10. The straight strip stator lamination of claim 9, wherein:

Along the centerline direction of the first stator tooth (1), the maximum distance between the second end face (22) of the first stator yoke (2) and the free end face 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 centerline of the first stator tooth (1) is the tooth length L5; along the centerline direction of the first stator tooth (1), the distance between the joint position of the first end surface (21) and the yoke inner surface boss (8) and the second end surface (22) is the yoke height hj2;

the above parameters satisfy the following relation: t3=b2+h2-L5-hj 2.

11. The straight strip stator lamination of claim 9, wherein:

the yoke inner surface bosses (8) of two adjacent first stator yokes (2) are provided with connecting grooves (9) at the joint, and the connecting grooves (9) are opposite to the sinking grooves (7) and the minimum distance between the connecting grooves (9) and the sinking grooves (7) is the yoke connecting height h1.

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

the tooth distance between two adjacent first stator punching units (101) is L3, L3 is the distance between the central lines of two adjacent first stator teeth (1), the distance between the connecting position of the second end face (22) and the sinking groove (7) and the circle center is the stator radius R along the radial direction in the annular stator punching structure, the number of teeth of the first stator teeth (1) is the number of teeth Z1 of the stator core, and the parameters meet the following relational expression: l3=2 (R-h 1-t 3) tan (180 °/Z1).

13. The straight strip stator lamination of claim 9, wherein:

the pattern width of the straight strip type stator punching sheet is L2, L2 is the length that a plurality of first stator punching sheet units (101) are connected in sequence, the number of teeth of each first stator tooth (1) is stator core tooth number Z1, the tooth distance between two adjacent first stator punching sheet units (101) is L3, L3 is the distance between the central lines of two adjacent first stator teeth (1), and the parameters meet the following relational expression:

L2＝(Z1+0.5)*L3+(6～9mm)。

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

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

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

along the direction of the central line of the first stator tooth (1), the maximum distance between the second end face (22) of the first stator yoke (2) and the free end face of the first stator tooth (1) is the width b2 of the stator core, the distance between the tooth root and the tooth top of the first stator tooth (1) at the central line of the first stator tooth (1) is the tooth length L5, the tooth number of the first stator tooth (1) is the tooth number Z1 of the stator core, and the above parameters satisfy the following relation: b3 =2× (b2+h2-L5-t 3-h 1) ×tan (180 °/Z1).

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

the stator comprises a stator core, a stator core and a stator core, wherein the stator core is characterized in that a first bulge (11) is arranged on a first stator yoke (2) of a first stator punching unit at the head end towards the direction of the first stator yoke (2) of the first stator punching unit at the tail end in a protruding mode, a first groove (12) is formed in the first stator yoke (2) of the first stator punching unit at the tail end towards the direction of the first stator yoke (2) of the first stator punching unit at the tail end away from the head end, and the first bulge (11) can be inserted into the first groove (12) to form clamping connection.

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

the first protrusion (11) is an arc protrusion, the first groove (12) is an arc groove, the width of the arc protrusion along the direction perpendicular to the first end face (21) is b4, the distance from the first end face (21) to the second end face (22) of the first stator yoke (2) is yoke height hj2, the number of teeth of the first stator teeth (1) is stator core number of teeth Z1, and the above parameters satisfy the following relation: b4 = (20% -40%) (hj2+h2)/tan (180 °/Z1).

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

The second end face (22) of the first stator yoke (2) of the head end is provided with a second bulge (13) in a protruding mode in a direction deviating from the first end face (21), the second end face (22) of the first stator yoke (2) of the tail end of the first stator yoke is provided with a third bulge (14) in a protruding mode in a direction deviating from the first end face (21), and a joint position of the first bulge (11) and the first groove (12) is between the first end face (21), and the opposite and joint surfaces of the two first stator yokes (2) are first joint surfaces (15); the side surface of the second bulge (13) is connected with the side surface of the third bulge (14) to form a second connection surface (16), the second connection surface (16) and the first connection surface (15) are positioned on different surfaces, and the second connection surface (16) is close to the first stator tooth (1) at the head end relative to the first connection surface (15).

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

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

20. A straight strip stator lamination as defined in claim 3 wherein:

the first stator teeth (1) comprise stator teeth main bodies (17) and pole shoes (18), one ends of the pole shoes (18) are connected to the circumferential side surfaces of the stator teeth main bodies (17) and are at positions farthest from the first stator yoke parts (2), the other ends of the pole shoes extend towards the circumferential direction, and the number of the pole shoes (18) is two and is set in one-to-one correspondence with the circumferential two sides of the stator teeth main bodies (17);

the stator tooth comprises a stator tooth main body (17), wherein a first buckling point (191) is arranged on the end face of the stator tooth main body (17) in a protruding mode, reserved grooves (20) are formed in two sides of the first buckling point (191), the depth of each reserved groove (20) is t2, and a second buckling point (192) is arranged on the end face of the first stator yoke portion (2) in a protruding mode.

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

the circumferential width of the stator tooth main body is tooth width bt, and the relation is satisfied: t2= (1% -2%). Bt/2.

22. A straight strip stator lamination as defined in claim 3 wherein:

after the annular stator punching structure is formed, the first stator teeth (1) are positioned on the radial inner side of the first stator yoke (2), namely, the stator core for the inner rotor motor.

23. A stator, characterized in that: comprising the straight stator lamination of any one of claims 1-22.

24. An electric motor, characterized in that: comprising the stator of claim 23.

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