A straight bar stator lamination, a stator and an electric machine

Abstract

The application provides a straight-bar stator lamination, a stator and a motor. The straight-bar stator lamination is simultaneously arranged and manufactured to form multiple stator lamination units in the process of layout manufacturing. The multiple stator lamination units include a first stator lamination unit and a second stator lamination unit. One end of a first stator tooth is connected to a first stator yoke, and the other end of the first stator tooth extends away from the second stator lamination unit. One end of a second stator tooth is connected to a second stator yoke, and the other end of the second stator tooth extends away from the first stator lamination unit. The first stator yoke is connected to the second stator yoke. The end face of the first stator yoke opposite to the first stator tooth is a second end face. The end face of the second stator yoke opposite to the second stator tooth is a fourth end face. The second end face and the fourth end face are adapted to each other and are arranged to be in close contact. According to the application, the original overlapping edge bf2 between each group of stator laminations can be effectively saved, the utilization of materials is improved, and the cost of the stator is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor technical field, specifically relates to a straight bar type stator lamination, a stator and a motor. BACKGROUND

[0002] Cost reduction is one of the important goals of motor research and development, and the electromagnetic technology in the field of fan motor is relatively mature, and the products of various manufacturers are seriously homogenized, so it is difficult to achieve the purpose of cost reduction from electromagnetic scheme optimization, therefore, improving the material utilization rate of the motor by reducing waste in the production process has become the main cost reduction route.

[0003] The stator form of the prior art is generally divided into four types: whole circle type, block type, coiled type and straight bar type. The material utilization rate of the whole circle type stator is low, and the winding speed is slow; each stator unit of the block type stator needs to be wound separately, and the wire ends are more after splicing and processing, and the process is complex and complicated, and the circle precision is low; the structure of the coiled type stator is complex, and the process is difficult; the straight bar type stator has comprehensive advantages in the above aspects, so it is most widely used in fan motors.

[0004] As shown in Figure 1 The traditional stator core is generally in the form of a pair of insertion rows, that is, the tooth portions of the two rows of stator laminations are staggered and inserted into a group, and are punched at the same time. According to the shape of the traditional stator core, two lap joints must be reserved during rowing, one of which is a lap joint reserved between the two rows of stator laminations in a group, and the width of the lap joint is bf1, and the other is a lap joint reserved between each group, and the width of the lap joint is bf2, and the material utilization rate of a row of stator laminations

[0005] =V1*2 / L1 / (b1+hj1+bf1+bf2), L1=(Z1+0.5)*L4+(6-9mm), wherein V1 is the practical area of the traditional stator lamination, b1 is the width of the stator lamination, L1 is the rowing material width, Z1 is the number of stator core teeth, L4 is the tooth pitch, and hj1 is the yoke height, so eliminating the lap joint and shortening the tooth pitch of the stator core can greatly improve the material utilization rate of the stator lamination.

[0006] Because the stator lamination of the prior art needs to reserve a lap joint during rowing, there are technical problems such as low material utilization rate, therefore, the present application designs a straight bar type stator lamination, a stator and a motor. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is to overcome the defects of the prior art, that is, the stator lamination needs to reserve a lap joint during rowing, which leads to low material utilization rate, so as to provide a straight bar type stator lamination, a stator and a motor.

[0008] In order to solve the above problems, the present application provides a straight bar type stator lamination, which comprises:

[0009] The straight-bar stator lamination is simultaneously laid out to form a plurality of stator lamination units in the layout process, the structures of the plurality of stator lamination units are the same, and the plurality of stator lamination units include a first stator lamination unit and a second stator lamination unit;

[0010] The first stator lamination unit includes a first stator tooth and a first stator yoke, one end of the first stator tooth is connected to the first stator yoke, and the other end of the first stator tooth extends away from the second stator lamination unit, the second stator lamination unit includes a second stator tooth and a second stator yoke, one end of the second stator tooth is connected to the second stator yoke, and the other end of the second stator tooth extends away from the first stator lamination unit, and the first stator yoke is arranged in connection with the second stator yoke;

[0011] The end face of the first stator yoke where the first stator tooth is arranged is a first end face, and the end face opposite to the first stator tooth is a second end face; the end face of the second stator yoke where the second stator tooth is arranged is a third end face, and the end face opposite to the second stator tooth is a fourth end face; and the second end face and the fourth end face are adapted to each other and arranged in abutment.

[0012] In some embodiments, a third stator lamination unit is further included, and the third stator lamination unit, the first stator lamination unit and the second stator lamination unit are sequentially connected;

[0013] The third stator lamination unit includes 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 toward the first stator yoke and is arranged in connection with the first stator yoke; and the first stator tooth extends toward the third stator yoke and is arranged in connection with the third stator yoke;

[0014] The end face of the third stator yoke where the third stator tooth is arranged is a fifth end face, and the end face opposite to the third stator tooth is a sixth end face; the free end face of the first stator tooth is adapted to the fifth end face and abuts against each other, and the free end face of the third stator tooth is adapted to the first end face and abuts against each other.

[0015] In some embodiments, the first stator lamination unit is a plurality of first stator lamination units, the plurality of first stator lamination units are sequentially connected to form the straight-bar stator lamination, and a first stator lamination unit at a head end is connected to a first stator lamination unit at a tail end to form a ring-shaped stator lamination structure.

[0016] In some embodiments, the second stator lamination unit is a plurality of units, and the plurality of second stator lamination units are sequentially connected; the third stator lamination unit is a plurality of units, and the plurality of third stator lamination units are sequentially connected; the first stator tooth is inserted between two adjacent third stator teeth, and the third stator tooth is inserted between two adjacent first stator teeth, forming a structure of alternating insertion.

[0017] In some embodiments, the free end surface of the first stator tooth is a first arc surface, the fifth end surface of the third stator yoke is a second arc surface, and the first arc surface and the second arc surface are in abutment; the free end surface of the third stator tooth is a third arc surface, the first end surface of the first stator yoke is a fourth arc surface, and the third arc surface and the fourth arc surface are in abutment.

[0018] In some embodiments, the first arc surface is a concave arc surface, and the second arc surface is a convex arc surface; the third arc surface is a concave arc surface, and the fourth arc surface is a convex arc surface.

[0019] In some embodiments, the second end surface of the first stator yoke is a straight plane, and the fourth end surface of the second stator yoke is a straight plane when the structure is made by layout.

[0020] In some embodiments, a sunken groove is provided on the second end surface at the joint of two adjacent first stator yokes in the straight-bar stator lamination, and the depth of the sunken groove is t3.

[0021] In some embodiments, a yoke inner surface boss is outwardly and convexly provided on the first end surface of the first stator yoke, and the height of the yoke inner surface boss from the first end surface is yoke inner surface boss height h2.

[0022] In some embodiments, along the centerline direction 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, and the distance between the tooth root and the tooth top of the first stator tooth at the centerline of the first stator tooth is tooth length L5; along the centerline direction of the first stator tooth, the distance between the joint position of the first end surface and the yoke inner surface boss and the second end surface is yoke height hj2.

[0023] The above parameters satisfy the following relationship: t3=b2+h2-L5-hj2.

[0024] In some embodiments, the yoke inner surface bosses of two adjacent first stator yokes are provided with a connecting groove at the joint by means of recess, and the connecting groove is opposite to the sunken groove and has a minimum distance h1 from the sunken groove.

[0025] In some embodiments, the tooth pitch between two adjacent first stator lamination units is L3, L3 is the distance between the midlines of two adjacent first stator teeth, the distance between the position where the second end surface meets the sink groove and the center of the annular stator lamination structure is the stator radius R, the number of the first stator teeth is the stator core tooth number Z1, and the above parameters satisfy the following relationship:

[0026] L3 = 2 * (R - h1 - t3) * tan (180° / Z1).

[0027] In some embodiments, the layout width of the straight bar stator lamination is L2, L2 is the length of the first stator lamination units connected in sequence, the number of the first stator teeth is the stator core tooth number Z1, the tooth pitch between two adjacent first stator lamination units is L3, L3 is the distance between the midlines of two adjacent first stator teeth, and the above parameters satisfy the following relationship: L2 = (Z1 + 0.5) * L3 + (6-9mm).

[0028] In some embodiments, a process groove is arranged on the free end surface of the first stator tooth, the width of the process groove is b3, and the depth of the process groove is t1 = 0.2-0.3mm.

[0029] 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 the first stator teeth is the stator core tooth number Z1, and the above parameters satisfy the following relationship: b3 = 2 * (b2 + h2 - L5 - t3 - h1) * tan (180° / Z1).

[0030] In some embodiments, a first protrusion is arranged on the first stator yoke of the first stator lamination unit at the head end and protrudes towards the first stator yoke of the first stator lamination unit at the tail end, a first recess is arranged on the first stator yoke of the first stator lamination unit at the tail end and faces away from the first stator yoke of the first stator lamination unit at the head end, the first protrusion can be inserted into the first recess to form a clamping.

[0031] In some embodiments, the first protrusion is a circular arc protrusion, the first groove is a circular arc groove, a width of the circular arc protrusion in a direction perpendicular to the first end face is b4, a distance between the first end face and the second end face of the first stator yoke portion is a yoke height hj2, and a number of the first stator teeth is a stator core tooth number Z1. The above parameters satisfy the following relationship: b4 = (20%~40%)*(hj2+h2) / tan(180° / Z1).

[0032] In some embodiments, the second protrusion is arranged on the second end face of the first stator yoke portion of the first stator lamination unit at the first end in a direction away from the first end face, the third protrusion is arranged on the second end face of the first stator yoke portion of the first stator lamination unit at the last end in a direction away from the first end face, the first interface is formed between the first protrusion and the first end face, and the second interface is formed between a side surface of the second protrusion and a side surface of the third protrusion.

[0033] In some embodiments, the first interface and the second interface each pass a center of the annular stator lamination structure, and a center angle formed by the first interface and the second interface is α; the protruding height of the second protrusion is the same as the protruding height of the third protrusion, and the protruding height is h3, and h3 = 0.2~0.5 mm.

[0034] 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 at a position farthest away from the first stator yoke portion, and the other end extends in a circumferential direction, the pole shoe has two, and is arranged one-to-one corresponding to circumferential sides of the stator tooth body.

[0035] A first fastening point is arranged protruding on an end face of the stator tooth body, a reserved groove is arranged on both sides of the first fastening point, a depth of the reserved groove is t2, and a second fastening point is arranged protruding on an end face of the first stator yoke portion.

[0036] In some embodiments, a circumferential width of the stator tooth body is a tooth width bt, and the following relationship is satisfied: t2 = (1%~2%)*bt / 2.

[0037] In some embodiments, after the annular stator lamination structure is formed, the first stator tooth is located on a radially inner side of the first stator yoke portion, that is, a stator core for an internal rotor motor.

[0038] The application further provides a stator comprising the straight-bar stator lamination.

[0039] The application further provides an electric machine comprising the stator.

[0040] The straight-bar stator lamination, the stator and the electric machine provided by the application have the following beneficial effects:

[0041] 1. The straight-bar stator lamination, the stator and the electric machine provided by the application have the following beneficial effects:

[0042] 2. The straight-bar stator lamination, the stator and the electric machine provided by the application have the following beneficial effects:

[0043] 3. The straight-bar stator lamination, the stator and the electric machine provided by the application have the following beneficial effects:

[0044] 4. The straight bar type stator core of the present application is provided with a matching arc convex and arc groove at the joint of both sides, which can effectively avoid the cracking of the straight bar type stator core after being formed into a circle (the crack of the existing structure is a straight line, and the welding acceptance is easy to crack; the crack is not a straight line by the cooperation of the convex and the groove and the formation of the offset angle in the stamping process, so it is not easy to crack), which can effectively ensure the circle forming precision of the stator core and solve the problem of low stator roundness caused by the cracking of the stator core after being formed into a circle;

[0045] 5. The stator core of the present application is provided with a convex structure outside the joint after being formed into a circle, which is beneficial to the welding process, and the welding process only has one step, the production efficiency is high, and the problem of low production efficiency caused by the multiple welding processes of the stator core after being formed into a circle is solved; the stator punching piece tooth part is provided with a reserved groove at both sides of the buckle point position, so that the tooth width size does not exceed the tolerance range after the stamping buckle point, the product qualified rate is improved, and the problem of large stator tooth width size caused by the stamping buckle point of the stator punching piece is solved;

[0046] 6. The stator core tooth part of the present application is inside the yoke part, that is, the stator core for the internal rotor motor, the slot width of the straight bar type stator core after being formed into a circle will not be too large, the performance of the motor is improved, and the problem of low motor performance caused by the large slot width of the stator core after being formed into a circle is solved. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is the layout structure diagram of the existing straight bar type stator core;

[0048] Figure 2 is the layout structure diagram of the straight bar type stator core of the present application;

[0049] Figure 2a is Figure 2 the local enlarged view of the O part in FIG. 1;

[0050] Figure 3 is the circle forming structure diagram of the straight bar type stator core of the present application;

[0051] Figure 4 is the local enlarged view of the straight bar type stator core of the present application;

[0052] Figure 4a is Figure 4 the local enlarged view of the yoke part joint (A) of FIG. 1;

[0053] Figure 4b is Figure 4 the local enlarged view of the yoke part joint (E) of FIG. 1;

[0054] Figure 5 is the local enlarged view of the joint of the straight bar type stator core of the present application;

[0055] Figure 5a is Figure 5 a partial enlarged view of the joint (B) of

[0056] Figure 6 is a structure diagram of two stator lamination units of the existing straight-bar stator core when there is no process slot and no yoke portion boss;

[0057] Figure 6a is a partial enlarged view of the C part of Figure 6

[0058] Figure 6b is a partial enlarged view of the D part of Figure 6

[0059] The reference signs are represented as:

[0060] 101, first stator lamination unit; 102, second stator lamination unit; 1, first stator tooth; 2, first stator yoke portion; 21, first end face; 22, second end face; 3, second stator tooth; 4, second stator yoke portion; 41, third end face; 42, fourth end face; 103, third stator lamination unit; 5, third stator tooth; 6, third stator yoke portion; 61, fifth end face; 62, sixth end face; 7, sunken groove; 8, yoke portion inner surface boss; 9, connecting groove; 10, process slot; 11, first protrusion; 12, first recess; 13, second protrusion; 14, third protrusion; 15, first joint surface; 16, second joint surface; 17, stator tooth body; 18, pole shoe; 191, first buckling point; 192, second buckling point; 20, reserved slot; 20a, slender excess material. DETAILED DESCRIPTION

[0061] As shown in Figures 2-6 , the present application provides a straight-bar stator lamination, which comprises:

[0062] The straight-bar stator lamination simultaneously arranges and manufactures a plurality of stator lamination units in the layout manufacturing process, the structures of the plurality of stator lamination units are all the same, and the plurality of stator lamination units comprise a first stator lamination unit 101 and a second stator lamination unit 102;

[0063] The first stator lamination 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, and the other end of the first stator tooth 1 extends in a direction away from the second stator lamination unit 102, the second stator lamination 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, and the other end of the second stator tooth 3 extends in a direction away from the first stator lamination unit 101, and the first stator yoke portion 2 is arranged in conjunction with the second stator yoke portion 4;

[0064] ​​The end face of the first stator tooth 1 of the first stator yoke part 2 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 face of the second stator tooth 3 of the second stator yoke part 4 is a third end face 41, and the end face opposite to the second stator tooth 3 is a fourth end face 42; the second end face 22 and the fourth end face 42 are adapted and abutted with each other.

[0065] The present application has the following advantages: the first stator yoke part of the first stator punching sheet unit and the second stator yoke part of the second stator punching sheet unit are abutted, the second end face of the first stator yoke part and the fourth end face of the second stator yoke part are adapted and abutted with each other, the original overlapping edge bf2 between each group of stator punching sheets is effectively saved, the relative end faces of the two groups of stator yoke parts are adapted and abutted with each other, the utilization rate of the material is effectively improved, the outer surface of the yoke part of the straight bar type stator punching sheet is a straight surface, and no overlapping edge is needed between each group of stator punching sheets during the layout, the material utilization rate is improved, and the cost of the stator is reduced.

[0066] The application point of the present application is:

[0067] 1. The outer surface of the yoke part of the straight bar type stator punching sheet is a straight surface, each group of stator punching sheets can be abutted and laid out, and no overlapping edge is needed between them, thereby improving the material utilization rate.

[0068] 2. The inner diameter surface of the straight bar type stator punching sheet and the inner surface of the yoke part can be abutted and laid out, and no overlapping edge is needed between the two groups of stator punching sheets, thereby improving the material utilization rate.

[0069] 3. A sinking groove is arranged above the yoke part joint of the straight bar type stator punching sheet, and the depth of the sinking groove satisfies the relationship t3=b2+h2-L5-hj2, b2 is the width of the stator core, h2 is the height of the yoke part inner surface boss, L5 is the tooth length, and hj2 is the yoke part height. In the case of shortening the tooth pitch, other structures are not affected, the yoke part height is ensured not to be too small, the structural strength is avoided from being affected, and the structure stability is ensured. The tooth pitch of the adjacent stator unit satisfies the relationship L3=2*(R-h1-t3)*tan(180° / Z1), the sinking groove can effectively shorten the tooth pitch of the adjacent stator unit, thereby shortening the stator punching sheet layout material width and improving the material utilization rate.

[0070] 4. A process groove is arranged at the inner diameter surface of the stator punching sheet, and the width of the process groove satisfies the relationship:

[0071] b3=2*(b2+h2-L5-t3-h1)*tan(180° / Z1), b3 is the width of the process tank, h1 is the height of the yoke connection, the depth of the process tank t1=0.2~0.3mm, the depth ensures that the process chamfer remains in the process tank, and the process tank can effectively weaken the cogging torque and torque ripple of the motor and avoid secondary processing;

[0072] 5. The yoke inner surface is designed with a boss, the boss height h2 needs to be greater than the process chamfer radius, the chamfer is left on the boss, which prevents the stator punching sheet from leaving long excess material on both sides of the pole shoe after stamping, and avoids secondary processing;

[0073] 6. The straight strip type stator core is provided with a matching circular arc protrusion and a circular arc groove at the two side laps respectively, the circular arc protrusion width satisfies the relationship formula: b4=(20%~40%)*(hj2+h2) / tan(180° / Z1), which can effectively avoid the cracking phenomenon of the straight strip type stator core after being formed into a circle;

[0074] 7. The part of the yoke above the circular arc protrusion is offset in the opposite direction of the circular arc protrusion, and the part of the yoke above the circular arc groove is offset in the direction of the slot opening of the circular arc groove, the two offset angles are consistent, and the two parts of the yoke are designed with sharp protrusions, so that the two parts of the yoke have lap outwards protruding structures, the heights of the two protruding structures are consistent, h3=0.2~0.5mm, and the lap outwards protruding structure is beneficial to the welding process;

[0075] 8. The stator punching sheet tooth part buckle point position is provided with a reserved groove on both sides, and the reserved groove depth satisfies the relationship formula:

[0076] t2=(1%~2%)*bt / 2, which can ensure that the tooth width size does not exceed the tolerance range after stamping the buckle point.

[0077] The present application solves the following technical problems:

[0078] 1. The problem of low material utilization rate caused by the need to reserve the lap when arranging the stator punching sheet;

[0079] 2. The problem of low material utilization rate caused by the long width of the stator punching sheet;

[0080] 3. The problem of damage to the tool and the punching sheet caused by the stamping of the stator punching sheet;

[0081] 4. The problem of remaining material at the corner of the stator punching sheet after stamping, which needs secondary processing;

[0082] 5. The problem of large cogging torque and large torque ripple of the motor;

[0083] 6. The problem of low stator roundness caused by the cracking of the stator core after being formed into a circle;

[0084] 7. The stator core is formed into a circle, and the welding process is more, the production efficiency is lower problem;

[0085] 8. The stator punching piece stamping buckle point leads to the problem of large size of stator tooth width;

[0086] 9. The stator core is formed into a circle, and the slot width is too large, which leads to the problem of reducing the performance of the motor.

[0087] In view of the technical background problem, the present application provides a high material utilization rate, high circle precision no overlap straight strip type stator core, the specific technical scheme is as follows:

[0088] 1. The straight strip type stator core without overlap is formed by stacking a plurality of stator punching pieces, each of the stator punching pieces comprises a plurality of sequentially connected stator units, and each of the stator units comprises a yoke, a tooth and a pole shoe.

[0089] 2. As shown in Figure 2 The inner diameter surface of the straight strip type stator punching piece and the inner surface of the yoke can be inserted and arranged in close contact, and no overlap is required between the two rows of stator punching pieces; the outer surface of the yoke of the straight strip type stator punching piece is a straight surface, and each group of stator punching pieces can be arranged in close contact, and no overlap is required between them, which can greatly shorten the layout length and improve the material utilization rate of the stator punching piece.

[0090] In some embodiments, a third stator punching piece unit 103 is further included, and the third stator punching piece unit 103, the first stator punching piece unit 101 and the second stator punching piece unit 102 are sequentially connected;

[0091] The third stator punching piece 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 extends towards the first stator yoke 2 and is arranged in connection with the first stator yoke 2; the first stator tooth 1 extends towards the third stator yoke 6 and is arranged in connection with the third stator yoke 6;

[0092] The end surface of the third stator tooth 5 provided on the third stator yoke 6 is a fifth end surface 61, and the end surface opposite to the third stator tooth 5 is a sixth end surface 62; the free end surface of the first stator tooth 1 is adapted to the fifth end surface 61 and is in close contact with each other, and the free end surface of the third stator tooth 5 is adapted to the first end surface 21 and is in close contact with each other.

[0093] The present application can effectively save the reserved flange bf1 between two rows of stator punching sheets in the original group, and can further improve the utilization of materials, i.e., the inner diameter surface of the straight bar type stator punching sheet is arranged in combination with the inner surface of the yoke part, and no flange is reserved between the two rows of stator punching sheets, thereby further improving the material utilization and further reducing the cost of the stator.

[0094] In some embodiments, the first stator punching sheet unit 101 is multiple, and the multiple first stator punching sheet units are sequentially connected to form the straight bar type stator punching sheet, and the first stator punching sheet unit at the head end is connected with the first stator punching sheet unit at the tail end to form a ring-shaped stator punching sheet structure. This is the preferred structure of the ring-shaped stator punching sheet formed by the straight bar type stator punching sheet of the present application, in which the first stator punching sheet units are connected at the head end to form a ring-shaped stator punching sheet structure, and multiple ring-shaped stator punching sheet structures are stacked and pressed into an integrated stator core structure.

[0095] In some embodiments, the second stator punching sheet unit 102 is multiple, and the multiple second stator punching sheet units are sequentially connected; the third stator punching sheet unit 103 is multiple, and the multiple third stator punching sheet units are sequentially connected; the first stator tooth 1 is inserted between two adjacent third stator teeth 5, and the third stator tooth 5 is inserted between two adjacent first stator teeth 1, forming an interlocking arrangement structure. This is the preferred structure of the second stator punching sheet unit and the third stator punching sheet unit of the present application, i.e., multiple stator punching sheet units can be made at the same time in one row of arrangement, and after forming a ring-shaped stator punching sheet structure, the stator core structure can be pressed. Since the first flange bf1 reserved between two rows of stator punching sheets in one group and the second flange bf2 between each group of stator punching sheets are effectively saved, the utilization of materials can be effectively improved, and the cost of the stator is reduced.

[0096] In some embodiments, the free end surface of the first stator tooth 1 is a first arc surface, the fifth end surface 61 of the third stator yoke part 6 is a second arc surface, and the first arc surface and the second arc surface are in combination and connected; the free end surface of the third stator tooth 5 is a third arc surface, the first end surface 21 of the first stator yoke part 2 is a fourth arc surface, and the third arc surface and the fourth arc surface are in combination and connected.

[0097] In the arrangement and manufacturing process, the second end surface 22 of the first stator yoke part 2 is a straight plane, and the fourth end surface 42 of the second stator yoke part 4 is a straight plane.

[0098] This is the preferred structure of the free end face and the fifth end face of the first stator tooth of the present application, which can effectively save the original lap, save materials, improve material utilization, and reduce the cost of the stator by forming an arc surface structure through the cooperation of the arc surface structure and forming a flat surface by a straight plane.

[0099] In some embodiments, the first arc surface is a concave arc surface, and the second arc surface is a convex arc surface; the third arc surface is a concave arc surface, and the fourth arc surface is a convex arc surface. This is the preferred structure of the first arc surface, the second arc surface, the third arc surface, and the fourth arc surface of the present application, which can form a concave-convex arc surface structure.

[0100] In some embodiments, a sunken groove 7 is provided on the second end face 22 at the junction of two adjacent first stator yoke portions 2 of the straight-bar stator lamination, and the depth of the sunken groove 7 is t3. The present application can effectively shorten the tooth pitch of adjacent stator units by providing a sunken groove above the junction of the yoke portions of the straight-bar stator lamination, thereby shortening the layout material width of the stator lamination, improving material utilization, and reducing the cost of the stator.

[0101] In some embodiments, the first stator yoke portion 2 is provided with a yoke inner surface boss 8 outwardly protruding on the first end face 21 (as shown in Figure 2a The yoke inner surface boss 8 of the first stator yoke portion is an arc surface, and the yoke inner surface boss is an arc-shaped inner surface protruding on the first arc surface. The yoke inner surface boss 8 of the first stator yoke portion is in cooperation with the arc-shaped free end face (i.e., the third arc surface) of the third stator tooth 5. 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 face 21 is the yoke inner surface boss height h2. The yoke inner surface boss height h2 of the present application needs to be greater than the process chamfer radius, which can leave the chamfer on the boss, as shown in Figure 6 which can prevent the stator lamination from leaving long excess material 20a on both sides of the pole shoe after stamping, avoiding secondary processing.

[0102] In some embodiments, the maximum distance between the second end face 22 of the first stator yoke portion 2 and the free end face of the first stator tooth 1 along the centerline direction of the first stator tooth 1 (i.e., it can be in the centerline direction or parallel to the centerline direction, both of which belong to the centerline direction, and the same below) 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 centerline of the first stator tooth 1 is the tooth length L5, and 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 centerline direction of the first stator tooth 1 is the yoke height hj2.

[0103] The above parameters satisfy the following relationship: t3 = b2 + h2 - L5 - hj2.

[0104] The present application satisfies the relationship: t3 = b2 + h2 - L5 - hj2, b2 is the width of the stator core, h2 is the height of the yoke inner surface boss, L5 is the tooth length, and hj2 is the yoke height, which can shorten the tooth pitch without affecting other structures, and also ensures that the yoke height is not too small to avoid affecting the structural strength and ensure structural stability.

[0105] In some embodiments, the yoke inner surface boss 8 of two adjacent first stator yokes 2 is provided with a connecting groove 9 in the form of a recess at the joint, and the connecting groove 9 is opposite to the sinking groove 7 and the minimum distance between the connecting groove 9 and the sinking groove 7 is the yoke connecting height h1.

[0106] In some embodiments, the tooth pitch between two adjacent first stator lamination units 101 is L3, L3 is the distance between the center lines of two adjacent first stator teeth 1, the distance between the position where the second end surface (22) meets the sinking groove (7) and the center of the annular stator lamination structure along the radial direction is the stator radius R, the number of teeth of the first stator tooth 1 is the stator core tooth number Z1, and the above parameters satisfy the following relationship: L3 = 2 * (R - h1 - t3) * tan (180° / Z1).

[0107] The present application satisfies the relationship: L3 = 2 * (R - h1 - t3) * tan (180° / Z1) by the tooth pitch of adjacent stator units, which can effectively shorten the tooth pitch of adjacent stator units by the sinking groove, and the larger t3 is, the smaller the tooth pitch is. The smaller the tooth pitch is, the shorter the length of the straight bar stator lamination is, so the layout material width L2 is shorter, thereby shortening the layout material width of the stator lamination and improving the material utilization rate.

[0108] In some embodiments, the layout width of the straight bar stator lamination is L2, L2 is the length of a plurality of first stator lamination units 101 connected in sequence, the number of teeth of the first stator tooth 1 is the stator core tooth number Z1, the tooth pitch between two adjacent first stator lamination units 101 is L3, L3 is the distance between the center lines of two adjacent first stator teeth 1, and the above parameters satisfy the following relationship:

[0109] L2 = (Z1 + 0.5) * L3 + (6-9mm);

[0110] The material utilization rate of the stator laminations in the nesting area is η, and the usable area of ​​the stator laminations in the nesting area is V2. 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. The distance between the first end face 21 and the second end face 22 of the first stator yoke 2 is the height hj2 of the yoke. The above parameters satisfy the following relationship: η=V2*2 / (L2*(b2+hj2+h2).

[0111] like Figure 4 As shown, a recessed groove is provided above the yoke joint of the straight stator lamination, which can effectively shorten the tooth pitch of adjacent stator units, thereby shortening the stator lamination layout width and improving material utilization. The depth of the recessed groove satisfies the relationship: t3=b2+h2-L5-hj2, and the tooth pitch of adjacent stator units satisfies the relationship:

[0112] L3=2*(R-h1-t3)*tan(180° / Z1), the width of the straight stator lamination sample satisfies the following relationship:

[0113] L2 = (Z1 + 0.5) * L3 + (6 ~ 9 mm), where η is the material utilization rate of a row of stator laminations.

[0114] =V2*2 / L2 / (b2+hj2+h2), where R is the outer radius of the stator core, Z1 is the number of teeth in the stator core, and V2 is the usable area of ​​the stator lamination; this can effectively shorten the material width and improve the utilization rate of materials.

[0115] In some embodiments, a process groove 10 is provided on the free end face of the first stator tooth 1, and the width of the process groove 10 is b3.

[0116] This invention features a process groove on the inner diameter surface of the stator lamination, which allows machine oil to better penetrate the lamination material during stamping, preventing damage to the cutting tools and the lamination itself. The process groove also prevents long, thin pieces of material from remaining at the edges and corners after stamping, avoiding secondary processing (such as...). Figure 6 As shown, the edges and corners are chamfered after a single punching process. Unless the punching is done in two separate processes, some material will be left over. The process groove can retain this material within the groove, so it does not affect normal use. The process groove also reduces the cogging torque and torque pulsation of the motor (slotting the stator pole shoes is equivalent to increasing the number of slots, which increases the frequency of cogging torque and reduces its amplitude. Increasing the number of slots reduces the non-uniformity of the air gap magnetic reluctance, thus reducing the torque pulsation generated).

[0117] In some embodiments, along the direction of the center line of the first stator tooth 1, the maximum distance between the second end surface 22 of the first stator yoke 2 and the free end surface 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 center line of the first stator tooth 1 is the tooth length L5, and the number of the first stator tooth 1 is the number of stator core teeth Z1, and the above parameters satisfy the following relationship: b3=2*(b2+h2-L5-t3-h1)*tan(180° / Z1), and the depth of the process groove t1 is 0.2-0.3 mm. Satisfying the above relationship and the depth can ensure that the process chamfer remains in the process groove, effectively weaken the cogging torque and torque ripple of the motor, and avoid secondary processing.

[0118] In some embodiments, the first protrusion 11 is provided on the first stator yoke 2 of the first stator lamination unit at the head end and protrudes towards the first stator yoke 2 of the first stator lamination unit at the tail end, and the first recess 12 is provided on the first stator yoke 2 of the first stator lamination unit at the tail end and faces away from the first stator yoke 2 of the first stator lamination unit at the head end, the first protrusion 11 can be inserted into the first recess 12 to form a clamping connection.

[0119] The present application can effectively avoid the cracking phenomenon of the straight bar type stator core after being formed into a circle (the existing structure is not matched with the protrusion and the recess, the crack is a straight line, and the welding receptacle is easy to crack; the protrusion and the recess of the present application can form an offset angle in the stamping process, so the crack is not a straight line, and it is not easy to crack), and ensure the circle forming accuracy of the stator core. (The lap of the present application refers to the crack between the first and last yokes of the straight bar type stator core after being formed into a circle).

[0120] In some embodiments, the first protrusion 11 is a circular arc protrusion, the first recess 12 is a circular arc recess, the width of the circular arc protrusion in 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, and the number of the first stator tooth 1 is the number of stator core teeth Z1, and the above parameters satisfy the following relationship:

[0121] b4=(20%-40%)*(hj2+h2) / tan(180° / Z1). Satisfying the above relationship can make the circular arc protrusion and the circular arc recess tightly combined after the straight bar type stator core is formed into a circle, increase the bonding strength, effectively avoid the cracking phenomenon of the straight bar type stator core after being formed into a circle, and increase the circle forming accuracy of the stator core.

[0122] In some embodiments, the first stator yoke part 2 of the first stator lamination unit at the head end is provided with a second protrusion 13 protruding away from the first end surface 21 on the second end surface 22, the first stator yoke part 2 of the first stator lamination unit at the tail end is provided with a third protrusion 14 protruding away from the first end surface 21 on the second end surface 22, between the first protrusion 11 and the first end surface 21, and the opposite and joint surface of the two first stator yoke parts 2 is a first joint surface 15; the side surface of the second protrusion 13 and the side surface of the third protrusion 14 form a second joint surface 16, and the second joint surface 16 and the first joint surface 15 are located on different surfaces, and the second joint surface 16 is closer to the first stator tooth 1 at the head end relative to the first joint surface 15.

[0123] After the stator core is formed into a circle, the structure protruding outward of the lap joint is beneficial to the welding process, and the welding process only has one step, the production efficiency is high, the part of the yoke part above the arc protrusion is offset in the opposite direction of the arc protrusion, the part of the yoke part above the arc groove is offset in the direction of the slot of the arc groove, the two offset angles are consistent, the two parts of the yoke part are designed to have sharp protrusions, so that the two parts of the yoke part have the structure protruding outward of the lap joint, and through the formation of the offset angle, the crack in the production process is not a straight line, so it is not easy to crack, and the production stability of the stator core is ensured.

[0124] In some embodiments, the first joint surface 15 and the second joint surface 16 each pass the center of the circular stator lamination structure, and the included angle of the centers formed by the two is α; the protrusion height of the second protrusion 13 and the protrusion height of the third protrusion 14 are the same, both are h3, and h3 = 0.2-0.5mm. The two parts of the yoke part of the present application have the structure protruding outward of the lap joint, and the heights of the two protruding structures are consistent, and the structure protruding outward of the lap joint is beneficial to the welding process.

[0125] In some embodiments, the first stator tooth 1 comprises a stator tooth body 17 and a pole shoe 18, one end of the pole shoe 18 is connected to the circumferential side surface of the stator tooth body 17 and is located farthest away from the first stator yoke part 2, and the other end extends in the circumferential direction, the pole shoe 18 has two, and is arranged one-to-one corresponding to the circumferential two sides of the stator tooth body 17;

[0126] The end face of the stator tooth body 17 is provided with a first buckle point 191, both sides of the first buckle point 191 are provided with a reserved groove 20, the depth of the reserved groove 20 is t2, and the end face of the first stator yoke part 2 is provided with a second buckle point 192. The reserved groove is arranged on both sides of the buckle point position of the stator punching sheet tooth part, so that after the buckle point is punched, the tooth width size does not exceed the tolerance range, and the product qualification rate is improved (the buckle point is a structure for buckling and pressing each punching sheet, so as to realize the positioning and connection between the punching sheets, and the stator core is assembled). When the buckle point is punched, the material on the side is extruded, so that the size is increased, the tooth width is an important size, and therefore the reserved groove needs to be cut.

[0127] In some embodiments, the circumferential width of the stator tooth body is a tooth width bt, and the relationship t2=(1%~2%)*bt / 2 is satisfied. The reserved groove is arranged on both sides of the buckle point position of the stator punching sheet tooth part, and the depth of the reserved groove satisfies the above relationship, so that after the buckle point is punched, the tooth width size does not exceed the tolerance range, and the subsequent skeleton can be smoothly fitted on the stator core.

[0128] In some embodiments, after the annular stator punching sheet structure is formed, the first stator tooth 1 is located on the radial inner side of the first stator yoke part 2, that is, an inner rotor motor stator core. The stator core tooth part is on the inner side of the yoke part, that is, an inner rotor motor stator core. After the straight bar type stator core is formed into a circle, it is ensured that the slot width will not be too large, and the performance of the motor is improved.

[0129] The application also provides a stator comprising the straight bar type stator punching sheet of any one of the preceding embodiments.

[0130] The stator of the application has the following advantages:

[0131] 1. The outer surface of the yoke part of the straight bar type stator punching sheet is a flat surface, and when the punching sheets are arranged, no overlap is needed between each group of stator punching sheets, the material utilization rate is improved, and the cost of the stator is reduced.

[0132] 2. The inner diameter surface of the straight bar type stator punching sheet can be arranged in combination with the inner surface of the yoke part, and no overlap is needed between the two rows of stator punching sheets, the material utilization rate is improved, and the cost of the stator is reduced.

[0133] 3. The upper part of the joint of the yoke part of the straight bar type stator punching sheet is provided with a sunken groove, which can effectively shorten the tooth pitch of adjacent stator units, thereby shortening the material width of the stator punching sheet arrangement, improving the material utilization rate, and reducing the cost of the stator.

[0134] 4. The inner diameter surface of the stator punching sheet is provided with a process groove, which can make the machine oil penetrate into the punching sheet material better during the punching process, prevent damage to the tool and the punching sheet, prevent long residual material at the corner of the stator punching sheet after punching, and avoid secondary processing. The process groove also has a weakening effect on the cogging torque and torque ripple of the motor.

[0135] 5. The straight bar stator core is provided with matching arc protrusions and arc grooves at both sides of the joint, which can effectively avoid the cracking of the straight bar stator core after being formed into a circle (the protrusions and grooves of the present application can form an offset angle during stamping, so the crack is not a straight line, and thus the cracking is not easy), and ensure the circle forming accuracy of the stator core;

[0136] 6. The protruding structure outside the joint after the stator core is formed into a circle is beneficial to the welding process, and the welding process only has one step, and the production efficiency is high;

[0137] 7. The straight bar stator core is provided with a reserved groove at both sides of the tooth part buckle point position, which ensures that the tooth width size does not exceed the tolerance range after the stamping buckle point, and improves the product qualification rate.

[0138] 8. The stator core tooth part is inside the yoke part, that is, the inner rotor motor stator core, and the slot width of the straight bar stator core after being formed into a circle is not too large, and the performance of the motor is improved.

[0139] The present application also provides a motor comprising the aforementioned stator.

[0140] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A straight bar stator lamination characterized by: include: The straight stator lamination is fabricated simultaneously during the layout process, with multiple stator lamination units having the same structure. The multiple stator lamination units include a first stator lamination unit (101) and a second stator lamination unit (102). The first stator lamination unit (101) includes 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), and the other end extends in a direction away from the second stator lamination unit (102). The second stator lamination unit (102) includes 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), and the other end extends in a direction away from the first stator lamination unit (101). The first stator yoke (2) and the second stator yoke (4) are connected to each other. The first stator yoke (2) is configured such that the end face of the first stator tooth (1) is the first end face (21), and the end face opposite to the first stator tooth (1) is the second end face (22); the second stator yoke (4) is configured such that the end face of the second stator tooth (3) is the third end face (41), and the end face opposite to the second stator tooth (3) is the fourth end face (42); the second end face (22) and the fourth end face (42) are adapted to each other and are fitted together.

2. The straight stator lamination according to claim 1, characterized in that: It also includes a third stator lamination unit (103), wherein the third stator lamination unit (103), the first stator lamination unit (101) and the second stator lamination unit (102) are connected in sequence; The third stator lamination 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 toward the first stator yoke (2) and is connected to the first stator yoke (2). The first stator tooth (1) extends toward the third stator yoke (6) and is connected to the third stator yoke (6). The third stator yoke (6) is configured such that the end face of the third stator tooth (5) is the fifth end face (61), and the end face opposite to the third stator tooth (5) is the sixth end face (62); the free end face of the first stator tooth (1) is adapted to and fits against the fifth end face (61), and the free end face of the third stator tooth (5) is adapted to and fits against the first end face (21).

3. The straight stator lamination according to claim 2, characterized in that: The first stator lamination unit (101) is multiple, and the multiple first stator lamination units are connected in sequence to form the straight stator lamination, and the first stator lamination unit at the beginning end is connected to the first stator lamination unit at the end end to form a ring-shaped stator lamination structure.

4. The straight stator lamination according to claim 3, characterized in that: The second stator lamination units (102) are multiple, and the multiple second stator lamination units are sequentially connected; the third stator lamination units (103) are multiple, and the multiple third stator lamination 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), forming a structure of alternating insertion and arrangement.

5. The straight-bar stator lamination of claim 2, wherein: a 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, the first arc face and the second arc face are in abutment and joint; a free end face of the third stator tooth (5) is a third arc face, the first end face (21) of the first stator yoke (2) is a fourth arc face, the third arc face and the fourth arc face are in abutment and joint.

6. The straight-bar stator lamination of claim 5, wherein: the first arc face is a concave arc face, and the second arc face is a convex arc face; the third arc face is a concave arc face, and the fourth arc face is a convex arc face.

7. The straight-bar stator lamination of any one of claims 2-6, wherein: in the arrangement, 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.

8. The straight-bar stator lamination of claim 3, wherein: a sunken groove (7) is arranged on the second end face (22) of the second stator yoke (4) at the joint of two adjacent first stator yokes (2) in the straight-bar stator lamination, and the depth of the sunken groove (7) is t3.

9. The straight-bar stator lamination of claim 8, wherein: a yoke inner surface boss (8) is outwardly and convexly arranged on the first end face (21) of the first stator yoke (2), and the height of the yoke inner surface boss (8) from the first end face (21) is yoke inner surface boss height h2.

10. The straight-bar stator lamination of claim 9, wherein: along the center line 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 center line of the first stator tooth (1) is tooth length L5; along the center line direction of the first stator tooth (1), 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) is yoke height hj2; the above parameters satisfy the following relationship: t3 = b2 + h2 - L5 - hj2.

11. The straight-bar stator lamination of claim 9, wherein: The inner surface protrusion (8) of the yoke of two adjacent first stator yokes (2) is provided with a connecting groove (9) at the joint, the connecting groove (9) is opposite to the sunken groove (7) and the minimum distance between the connecting groove (9) and the sunken groove (7) is the yoke connecting height h1.

12. The straight-bar stator lamination of claim 11, wherein: The tooth pitch between two adjacent first stator lamination units (101) is L3, L3 is the distance between the center lines of two adjacent first stator teeth (1), the distance between the position where the second end surface (22) meets the sunken groove (7) and the center of the ring-shaped stator lamination structure in the radial direction is the stator radius R, the number of the first stator teeth (1) is the stator core tooth number Z1, and the above parameters satisfy the following relationship: L3 = 2 * (R - h1 - t3) * tan (180° / Z1).

13. The straight-bar stator lamination of claim 9, wherein: The layout width of the straight-bar stator lamination is L2, L2 is the length of the connection of a plurality of first stator lamination units (101) in sequence, the number of the first stator teeth (1) is the stator core tooth number Z1, the tooth pitch between two adjacent first stator lamination units (101) is L3, L3 is the distance between the center lines of two adjacent first stator teeth (1), and the above parameters satisfy the following relationship: L2 = (Z1 + 0.5) * L3 + (6-9mm).

14. The straight-bar stator lamination of claim 11, wherein: A process groove (10) is arranged on the free end surface of the first stator tooth (1), the width of the process groove (10) is b3, and the depth of the process groove is t1 = 0.2-0.3mm.

15. The straight-bar stator lamination of claim 14, wherein: The maximum distance between the second end surface (22) of the first stator yoke (2) and the free end surface of the first stator tooth (1) in the direction of the center line 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 center line of the first stator tooth (1) is the tooth length L5, the number of the first stator teeth (1) is the stator core tooth number Z1, and the above parameters satisfy the following relationship: b3 = 2 * (b2 + h2 - L5 - t3 - h1) * tan (180° / Z1).

16. The straight-bar stator lamination of claim 9, wherein: A first protrusion (11) is arranged on the first stator yoke (2) of the first stator lamination unit at the head end and protrudes towards the first stator yoke (2) of the first stator lamination unit at the tail end, a first recess (12) is arranged on the first stator yoke (2) of the first stator lamination unit at the tail end and faces away from the first stator yoke (2) of the first stator lamination unit at the head end, the first protrusion (11) can be inserted into the first recess (12) to form a clamping connection.

17. The straight-bar stator lamination of claim 16, wherein: 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 in the direction perpendicular to the first end face (21) is b4, the distance between the first end face (21) and the second end face (22) of the first stator yoke (2) is the yoke height hj2, and the number of the first stator teeth (1) is the stator core tooth number Z1, and the above parameters satisfy the following relationship: 。 18. The straight-bar stator lamination of claim 16, wherein: The second end face (22) of the first stator yoke (2) of the first stator lamination unit at the head end is provided with a second protrusion (13) protruding away from the first end face (21), the second end face (22) of the first stator yoke (2) of the first stator lamination unit at the tail end is provided with a third protrusion (14) protruding away from the first end face (21), and the first protrusion (11) and the first groove (12) are located between the first end face (21) and the second end face (22), and the opposite and connected surfaces of the two first stator yokes (2) are first connected surfaces (15); the side surface of the second protrusion (13) and the side surface of the third protrusion (14) are connected to form a second connected surface (16), and the second connected surface (16) and the first connected surface (15) are located on different surfaces, and the second connected surface (16) is closer to the first stator tooth (1) at the head end relative to the first connected surface (15).

19. The straight-bar stator lamination of claim 18, wherein: The first connected surface (15) and the second connected surface (16) each pass through the center of the circular stator lamination structure, and the included angle of the centers formed by the two is α; the protrusion height of the second protrusion (13) and the protrusion height of the third protrusion (14) are the same, both being h3, and h3=0.2~0.5mm.

20. The straight-bar stator lamination of claim 3, wherein: The first stator tooth (1) comprises a stator tooth body (17) and a pole shoe (18), one end of the pole shoe (18) is connected to the circumferential side surface of the stator tooth body (17) at a position farthest away from the first stator yoke (2), and the other end extends in the circumferential direction, the pole shoe (18) has two and is arranged in one-to-one correspondence with the circumferential sides of the stator tooth body (17); A first bucking point (191) is protrudingly arranged on the end face of the stator tooth body (17), and a reserved groove (20) is arranged on both sides of the first bucking point (191), the depth of the reserved groove (20) is t2, and a second bucking point (192) is protrudingly arranged on the end face of the first stator yoke (2).

21. The straight-bar stator lamination of claim 20, wherein: The circumferential width of the stator tooth body is a tooth width bt, and satisfies a relationship: .

22. The straight-bar stator lamination of claim 3, wherein: After forming the circular stator lamination structure, the first stator tooth (1) is located on the radially inner side of the first stator yoke (2), that is, the stator core for an internal rotor motor.

23. A stator characterized by: A straight bar stator lamination comprising the straight bar stator lamination of any one of claims 1-22.

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

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