CN217216121U - Stator core of novel DC brushless motor - Google Patents

Abstract

The utility model discloses a novel stator core of brushless DC motor, including a plurality of laminated punching sheets, the punching sheet contains rectangular shaped main structure, four corners of main structure are provided with fillet structure, all be provided with trapezoidal protruding structure on four sides of main structure, the thickness of trapezoidal protruding structure equals with the thickness of main structure, four corners of main structure all opens the mounting hole, open along circular array 9 punching sheet grooves on the punching sheet, the side parallel and equidistant setting of adjacent punching sheet groove, the central point of 9 punching sheet grooves opens the stator hole, all opens wiring mouth between each punching sheet groove and the stator hole, is provided with welded structure on two relative sides of laminated punching sheet; the utility model has the advantages of low cost, long service life of the die and high production efficiency.

Description

Stator core of novel DC brushless motor

Technical Field

The utility model belongs to the technical field of DC brushless motor, concretely relates to new form DC brushless motor's stator core.

Background

The motor contains stator and rotor, and the material that stator and rotor all adopted is the silicon steel sheet, and the production mode of present common electric motor rotor, stator all is one set of mould production usually, perhaps reuses the single die production another product of falling waste material, and there is not high material utilization ratio in the current production mode, and the problem that production efficiency is low is unfavorable for people's use. And with the rising of the price of the silicon steel sheet, the manufacturing cost of the motor becomes a main factor for restricting the price of the product.

The traditional brushless direct current motor stator has two structural forms, namely a circular form and a polygonal form, and particularly has more quadrilateral structures; in the common appearance structure of the traditional polygonal motor, the connection part of the edges is in a sharp-angle transition mode. Due to the sharp-angle transition connection mode, the edge of a male die of the die is not easy to process, and the edge of the die is easy to break and damage in the punching process of the stator chip. The maintenance amount of the die is large, the service life of the die is short, and the processing cost of the iron core is further increased.

The Chinese invention patent (application number CN202111507149.5) discloses a manufacturing process of a stator core of a motor with a plurality of groups of step winding slots, which comprises the following process steps: step A, feeding; b, punching a wire winding slot: the method specifically comprises the following substeps: sub-step b1, punching a slotted hole; sub-step b2, punching a b slot; each pair of the a slotted hole and the b slotted hole are separated by a spacing part; substep b3, punching a c slot; obtaining a plurality of winding slot holes after the spacing part is completely punched; c, punching a metering hole or a fastening point; d, punching an inner hole; e, blanking; f, repeatedly circulating the steps B to E to obtain a plurality of stator core single sheets with different winding slot widths; step G, lamination: and buckling the plurality of stator core single sheets to obtain a stator core finished product. This scheme uses the strip to punch circular motor stator core, can lead to the waste material too much, with high costs, and only carries out punching to single row strip, and is inefficient.

The Chinese utility model patent (application number CN202022291906.7) discloses a stator punching sheet for a 2-pole aluminum wire motor, which comprises a stator punching sheet body, wherein a circular through hole is arranged in the middle of the stator punching sheet body, and a group of punching sheet grooves which are uniformly distributed are arranged on the inner wall of the circular through hole; the punching sheet groove comprises a groove body, a planar groove bottom is arranged at the inner side end of the groove body, a notch is arranged at the outer side end of the groove body, and an inclined connecting surface is arranged between the groove body and the notch; two side walls of the groove body are inclined planes, and a fillet is arranged between the groove bottom and the inclined planes; the width of the groove bottom is 6.35-6.42mm, and the radius of the fillet is 2.4-2.6 mm; the included angle between the inclined plane and the vertical plane is 7-9 degrees, the included angle between the inclined connecting plane and the vertical plane is 45-50 degrees, the corner parts of the motor are all transited in a sharp angle mode, when punching is carried out on punching sheets, a cutter is easy to break, the maintenance amount of a die is large, the service life of the die is short, and the cost is high.

How to reduce motor manufacturing cost, improve the utilization ratio of raw and other materials, the motor stator core mould that solves the closed angle structure maintenance volume is big, the short defect of mould life is the problem that needs to solve.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems in the prior art, providing a new form of DC brushless motor's stator core, this scheme has with low costs, the mould is longe-lived, advantage that production efficiency is high.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a new form brushless DC motor's stator core, includes a plurality of range upon range of towards the piece, it contains rectangular bodily structure to dash the piece, four bights of bodily structure are provided with fillet structure, all be provided with trapezoidal protruding structure on four sides of bodily structure, the thickness of trapezoidal protruding structure with the thickness of bodily structure equals, four bights of bodily structure have all opened the mounting hole, it has along circular array's 9 towards the piece groove to open on the piece, and is adjacent the parallel and equidistance setting in side of piece groove, 9 the central point of piece groove puts and opens there is the stator hole, every the piece groove with all open wiring mouth between the stator hole, range upon range of be provided with welded structure on two relative sides of piece.

In the scheme, the laminated punching sheets have the same structure and are fixed together after being laminated to form the stator core, the rectangular main body structure is convenient to arrange on a bar stock, the waste amount at the corners is less, the four corners of the main body structure are provided with fillet structures, and meanwhile, an iron core punching cutter is designed, so that the chip punching die processing can be simplified, the chip punching die break-out fault is greatly reduced, the chip punching die maintenance amount is reduced, and the punching sheet processing cost is effectively reduced. The laminated punching sheet is provided with a wiring opening for winding, two opposite side surfaces of the laminated punching sheet are welded through a welding structure, and the punching sheet is fixed.

Furthermore, the main body structure is square, the stator inner hole is located at the center of the main body structure, and the diameter of the stator inner hole is 0.5-0.7 times of the side length of the main body structure.

The stator inner hole in the square main body structure is arranged at the center, the structure is regular, the performance is uniform, the diameter of the stator inner hole is 0.5-0.7 times of the side length of the main body structure, the stator structure is guaranteed to be large enough, and meanwhile, the stability of the stator structure is guaranteed.

Furthermore, the height of the trapezoid protrusion structure is 0.03-0.08 times of the side length of the main body structure, the two sides of each trapezoid protrusion structure are provided with overlapped riveting points, the corners of the trapezoid protrusion structures are provided with fillet structures, the connection transition parts of the trapezoid protrusion structures and the main body structure are arranged to be arc-shaped structures, and the thickness of the stator core is 0.2-0.5 times of the side length of the stator core.

The height of trapezoidal protruding structure so sets up, strengthens the intensity of stator yoke portion and prevents to warp, avoids increasing too much cost simultaneously, and trapezoidal protruding structural setting is folded the riveting point and is used for folding the riveting and fix the stator towards the piece together, and folding riveting and welded fastening mode are selected one by one and are gone on. Be provided with fillet structure, arc structure, avoid forming the closed angle, reduce the die cutter and break out a mouthful trouble, reduce chip die maintenance volume, can realize the different performance requirements of motor through the thickness of adjustment stator core, the performance that the motor was guaranteed in the setting of thickness scope so meets the requirements.

Furthermore, the trapezoid protruding structure comprises two left and right protruding structures and two front and rear protruding structures, and the sum of the top edge and the bottom edge of each front and rear protruding structure is smaller than or equal to the distance between the top edges of the two left and right protruding structures.

The top edge and the bottom edge are arranged in such a way that the stamping sheets are arranged on the stamping strip material in a trapezoidal protruding structure in a staggered mode along the feeding direction, interference does not occur, the amount of corner waste materials is reduced, and the utilization rate of the raw materials is improved.

Furthermore, welded structure contains the parallel welding groove of twice, the welding groove sets up the left and right sides of trapezoidal protruding structure.

Through set up twice welding groove respectively on two relative sides of the piece of range upon range of towards, the welding groove sets up in the left and right sides, fixes, guarantees towards the stability that the piece is range upon range of.

Furthermore, the punching sheet groove comprises a top surface, a bottom surface and two side surfaces, and the width of the wiring opening is smaller than half of the width of the top surface of the punching sheet groove.

The punching sheet groove comprises a top surface, a bottom surface and two side surfaces and is in a trapezoidal shape, the top surface and the bottom surface of the punching sheet groove can have radians, the corners inside the punching sheet groove are in fillet transition, and the width of the wiring port is set in such a way, so that the fixing effect of the punching sheet groove on the coil is ensured.

A motor punching production process comprises the stator core of the novel direct current brushless motor, and comprises the following steps:

s1: the strip materials are sent into a punch press step by step through a power device, the strip materials are divided into at least two rows for punching through positioning two sides of the material belt, dies of two adjacent rows of strip materials are arranged at a half-station interval, and trapezoidal protruding structures of stator punching sheets on the two adjacent rows of strip materials are arranged in a staggered mode along the feeding direction;

the strip materials are fed in step by step, two sides of the material belt are positioned, each station can conveniently stamp the strip materials, the precision is guaranteed, the strip materials are divided into at least two rows, dies of two adjacent rows of strip materials are arranged at a half station interval, the trapezoidal protruding structures are arranged in a staggered mode along the feeding direction, the excess materials between the two rows of strip materials can be reduced, the utilization rate of the strip materials is improved, meanwhile, parts of the two rows of dies can be shared, the design cost of the dies is reduced, and the occupied area of the dies is reduced;

s2: firstly, punching a welding groove and a pilot hole of a stator, wherein the pilot hole is used for positioning in subsequent punching, then punching a rotor slot hole, then punching a rotor center hole, then punching and blanking a rotor punching sheet, and forming a rotor blanking hole at the blanking position of the rotor punching sheet;

the rotor punching sheet is punched by a punching die, the rotor part is punched and blanked firstly, the inner hole of the stator is conveniently punched, the rotor and the stator are punched on a strip material with the same unit length, the utilization rate of raw materials is improved, the welding groove and the pilot hole can be punched together in consideration of uniform distribution of die pressure, and the rotor punching sheet is blanked after the rotor slot hole and the rotor center hole are punched;

s3: positioning through the pilot hole, firstly punching 9 punching sheet grooves of the stator on the outer ring of the rotor blanking hole, then punching a mounting hole of the stator, and then punching an inner hole and a wiring port of the stator;

punching a punching sheet groove firstly and then punching a stator inner hole, so that the inner side and the outer side of the punching sheet groove can be supported and fixed when the punching sheet groove is punched, if a riveting point is required to be overlapped, the punching sheet groove and a mounting hole of a stator can be synchronously punched, and finally, the punching of the stator inner hole and the wiring opening is completed;

s4: blanking the stator punching sheet, and punching the outer ring edge of the stator punching sheet through an arc-shaped die.

The outer ring edge of the stator punching sheet is punched through the arc-shaped die, so that a sharp corner at the position of a cutting edge of the punching die is avoided, the punching die opening breakage fault and the punching die maintenance amount are reduced, and the punching sheet processing cost is effectively reduced. After the stator punching sheet is blanked, a waste cutting structure can be arranged, the waste is cut off, and the recovery is convenient.

Further, in steps S2 and S4, a conveying device perpendicular to the feeding direction is provided below the punch press, and the blanks are conveyed.

And a conveying device is arranged to convey the blanking, the conveying device can be a conveying belt, and the conveying belt can be connected with a collecting device.

Further, the first row of strip materials which leads by half station in the two adjacent rows of strip materials is provided with at least one vacancy in the step S3, so that the stator blanking of the two rows of strip materials is separated by at least one half station, and the conveying devices are respectively arranged at the stator blanking positions of the two rows of strip materials in the step S4.

So set up, can make the stator punching sheet interval blanking of two lists of strip material, prevent to interfere.

Furthermore, the shapes of the cutters of the stamping dies in two adjacent rows of strip materials are different, and the stamping dies are used for producing different stator punching models.

The shapes of the cutters are different, the corresponding female dies are different, two rows of strip materials can realize synchronous production of stator punching sheets of different models, blanking is carried out respectively, and the manufacturing cost of a single set of die can be reduced. The stator punching sheet is suitable for the condition that the stator punching sheets have the same shape and the two punching sheet models are required to be produced. Similarly, at least one vacancy can be set in step S2, the blanking positions are staggered by controlling the distribution of the mold positions, and the conveying devices are respectively set at the blanking positions of the two rows of strip rotors, so as to synchronously produce the rotor punching sheets of different models.

Compared with the prior art, the beneficial effects of the utility model are that:

1. by changing the sharp corner part on the motor stator punching sheet into a fillet structure, the die punching processing of the chip can be simplified, the die cracking fault of the chip is reduced, the maintenance amount of the die is reduced, and the punching sheet processing cost is effectively reduced;

2. by designing a structure and a process of staggered arrangement and synchronous punching of multiple rows of punching sheets, the stator punching sheet and the rotor punching sheet share the bar stock for punching, the utilization rate of raw materials is improved, the generation of waste materials is reduced, and the raw material cost of the motor punching sheet is reduced;

3. by adopting the synchronous punching process of multiple rows of punching sheets, the production efficiency of the die is improved, parts can be shared, and the manufacturing cost of a single set of die is reduced;

4. widen the width of stator core yoke portion through setting up trapezoidal protruding structure, prevent that the iron core from warping, strengthen the stability of iron core.

Drawings

Fig. 1 is a front view of a stator core middle lamination of a new dc brushless motor according to embodiment 1 of the present invention;

fig. 2 is a front view of a stator core of a new dc brushless motor according to embodiment 1 of the present invention;

FIG. 3 is a left side view of FIG. 2;

fig. 4 is a front view of a punching sheet in a stator core of a new dc brushless motor according to embodiment 2 of the present invention;

fig. 5 is a layout drawing of a stamping die in the motor sheet production process according to embodiment 3 of the present invention;

in the figure: 1. a body structure; 2. a fillet structure; 3. a trapezoidal convex structure; 4. mounting holes; 5. punching a sheet groove; 6. a stator bore; 7. a wiring port; 8. welding a groove; 9. folding and riveting points; 10. strip material; 11. a pilot hole; 12. a rotor center hole; 13. a rotor slot hole.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. In the description of the present invention, it should be noted that the terms front, back, left, right, etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention or simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed or operated in a specific position, and thus, should not be construed as limiting the present invention.

Example 1

As shown in fig. 1-3, a stator core of a new dc brushless motor comprises a plurality of laminated laminations, the punching sheet comprises a cuboid main structure 1, round corner structures 2 are arranged at four corners of the main structure 1, trapezoidal convex structures 3 are arranged on four side surfaces of the main body structure 1, the thickness of each trapezoidal convex structure 3 is equal to that of the main body structure 1, four bights of major structure 1 all open there is mounting hole 4, it has along circular array to open on the punching sheet 9 towards piece groove 5, and is adjacent the parallel and equidistance setting in side of punching sheet groove 5, 9 the central point of punching sheet groove 5 puts and opens stator hole 6, every punching sheet groove 5 with all open between the stator hole 6 wiring mouth 7, it is range upon range of be provided with welded structure on two relative sides towards the piece.

In the scheme, the laminated punching sheets have the same structure and are fixed together after being laminated to form a stator core, a rectangular main body structure 1 is convenient to arrange on a strip material 10, the amount of waste materials at corners is small, four corners of the main body structure 1 are provided with fillet structures 2, the fillet structures 2 and the radius of the fillet structures is 6mm, an iron core punching cutter is designed at the same time, chip punching die processing can be simplified, the chip punching die cracking fault is greatly reduced, the chip punching die maintenance amount is reduced, the punching sheet processing cost is effectively reduced, because the internal structure of the stator needs to consider a connecting coil, deformation is easy to occur, a trapezoidal convex structure 3 is arranged on the outer side of the stator, the width of a yoke part of the stator core is increased, the iron core is prevented from deforming, a mounting hole 4 is formed for fixing the stator core by connecting bolts, the side surfaces of punching sheet grooves 5 are arranged in parallel and equidistant mode and are used for connecting enameled wires and fixing the coil, the punching sheet groove 5 is provided with a stator inner hole 6 at the center for mounting a rotor, a wiring opening 7 for winding, and two opposite side surfaces of the laminated punching sheet are welded through a welding structure to fix the punching sheet. The thickness of the stator core is 25mm-47 mm.

Further, the main body structure 1 is square, the stator inner hole 6 is located at the center of the main body structure 1, and the diameter of the stator inner hole 6 is 0.5-0.7 times of the side length of the main body structure 1.

The stator inner hole 6 on the square main body structure 1 is arranged at the center, the side length of the main body structure 1 is 100mm, the diameter of the stator inner hole 6 is 66.2mm, the structure is regular, the performance is uniform, the diameter of the stator inner hole 6 is 0.5-0.7 times of the side length of the main body structure 1, the stator diameter is ensured to be large enough, and the stability of the stator structure is ensured.

Further, the trapezoid convex structure 3 comprises two left and right convex structures and two front and rear convex structures, and the sum of the top edge and the bottom edge of each front and rear convex structure is smaller than or equal to the distance between the top edges of the two left and right convex structures.

The top edge and the bottom edge are arranged in such a way that the trapezoidal protruding structures 3 on the stamping strip 10 are arranged in a staggered mode along the feeding direction, interference does not occur, the amount of corner waste is reduced, and the utilization rate of raw materials is improved.

Further, welded structure contains two parallel welding grooves 8, welding grooves 8 set up the left and right sides of trapezoidal protruding structure 3.

Through in range upon range of set up twice welding groove 8 respectively on two relative sides of piece, welding groove 8 sets up in the left and right sides, fixes, guarantees towards the stability that the piece is range upon range of.

Further, the sheet punching groove 5 comprises a top surface, a bottom surface and two side surfaces, and the width of the wiring opening 7 is smaller than half of the width of the top surface of the sheet punching groove 5.

The punching sheet groove 5 comprises a top surface, a bottom surface and two side surfaces and is in a trapezoidal shape, the top surface and the bottom surface of the punching sheet groove 5 can be provided with radians, the internal corners of the punching sheet groove 5 are in fillet transition, and the width of the wiring port 7 is set in such a way, so that the fixing effect of the punching sheet groove 5 on a coil is ensured.

Example 2

As shown in fig. 4, the stator core of the new dc brushless motor of the present embodiment is further optimized based on embodiment 1:

furthermore, the height of the trapezoid-shaped protruding structure 3 is 0.03-0.08 times of the side length of the main body structure 1, the two side positions of each trapezoid-shaped protruding structure 3 are provided with the overlapped riveting points 9, the corner of each trapezoid-shaped protruding structure 3 is provided with the fillet structure 2, the connection transition part of the trapezoid-shaped protruding structure 3 and the main body structure 1 is of an arc-shaped structure, the radius of the arc-shaped structure is 2mm, and the thickness of the stator core is 0.2-0.5 times of the side length of the stator core.

The height of trapezoidal protruding structure 3 so sets up, strengthens the intensity of stator yoke portion and prevents to warp, avoids increasing too much cost simultaneously, sets up on the trapezoidal protruding structure 3 and folds riveting point 9 and be used for folding the riveting to fix the stator punching together, folds the riveting and go on with the alternative of welded fastening mode. Be provided with fillet structure 2, arc structure, avoid forming the closed angle, reduce the die cutter and break out a mouthful trouble, reduce chip die maintenance volume, can realize the different performance requirements of motor through the thickness of adjustment stator core, the performance that the motor was guaranteed in the setting of thickness scope so meets the requirements.

And the welding structure and the welding groove 8 are eliminated, and the stator punching sheet is directly fixed in a riveting mode.

Example 3

As shown in fig. 5, a motor punching production process includes the new dc brushless motor stator core, and includes the following steps:

s1: the strip material 10 is sent to a punch press step by step through a power device, the strip material 10 is divided into at least two rows for punching by positioning two sides of the material belt, the dies of two adjacent rows of strip materials 10 are arranged at a half station interval, and the trapezoidal convex structures 3 of the stator punching sheets on the two adjacent rows of strip materials 10 are arranged in a staggered mode along the feeding direction;

the strip material 10 is fed in a stepping mode, two sides of the material belt are positioned, each station can conveniently punch the strip material 10, the precision is guaranteed, the strip material 10 is divided into at least two rows, dies of two adjacent rows of strip materials 10 are arranged at a half station interval, the trapezoidal protrusion structures 3 are arranged in a staggered mode along the feeding direction, excess materials between the two rows of strip materials 10 can be reduced, the utilization rate of the strip materials 10 is improved, meanwhile, parts of the two rows of dies can be shared, the design cost of the dies is reduced, and the occupied area of the dies is reduced; the step pitch of the strip is 109.5mm, the width of the strip is 224mm, and the length of a stamping part die is 1500 mm. The mold has compact structure, and reduces the occupied area and the cost.

S2: firstly, punching a welding groove 8 and a pilot hole 11 of a stator, wherein the pilot hole 11 is used for positioning in subsequent punching, then punching a rotor slot hole 13, then punching a rotor center hole 12, and then punching and blanking a rotor punching sheet, wherein a rotor blanking hole is formed at the blanking position of the rotor punching sheet;

the rotor is stamped and blanked through a stamping die, the inner hole 6 of the stator is conveniently stamped, the rotor and the stator are stamped on a strip 10 with the same unit length, the utilization rate of raw materials is improved, the welding groove 8 and the pilot hole 11 can be stamped together in consideration of uniform distribution of die pressure, and the rotor stamped sheet is blanked after the rotor slotted hole 13 and the rotor central hole 12 are stamped;

s3: positioning through the pilot hole 11, firstly punching 9 punching sheet grooves 5 of the stator on the outer ring of the rotor blanking hole, then punching a mounting hole 4 of the stator, and then punching an inner hole 6 of the stator and a wiring opening 7;

firstly punching a punching sheet groove 5 and then punching a stator inner hole 6, so that the inner side and the outer side of the punching sheet groove 5 can be supported and fixed when the punching sheet groove 5 is punched, if a riveting point 9 is required to be overlapped, the punching sheet can be synchronously punched with a mounting hole 4 of a stator, and finally, the punching of the stator inner hole 6 and the wiring opening 7 is completed;

s4: blanking the stator punching sheet, and punching the outer ring edge of the stator punching sheet through an arc-shaped die.

The outer ring edge of the stator punching sheet is punched through the arc-shaped die, so that a sharp corner at the position of a cutting edge of the punching die is avoided, the punching die opening breakage fault and the punching die maintenance amount are reduced, and the punching sheet processing cost is effectively reduced. After the stator punching sheet is blanked, a waste cutting structure can be arranged, the waste is cut off, and the recovery is convenient.

Further, in steps S2 and S4, a conveying device perpendicular to the feeding direction is provided below the punch press, and the blanks are conveyed.

And a conveying device is arranged to convey the blanking, the conveying device can be a conveying belt, and the conveying belt can be connected with a collecting device.

Further, the first row 10, which leads by half a station, of the two adjacent rows 10 of strips is provided with at least one vacancy in the step S3, so that the two rows 10 of strips are separated by at least one half station, and the two rows 10 of strips are respectively provided with the conveying device at the blanking position of the stator in the step S4.

So set up, can make two stator punching intervals blanking of strip 10, prevent to interfere.

Example 4

The motor punching sheet production process of the embodiment is further optimized on the basis of the embodiment 3:

further, the shapes of the cutters of the stamping dies in two adjacent rows of strip materials 10 are different, and the stamping dies are used for producing different stator punching models.

Meanwhile, two rows of strip materials 10 can realize synchronous production of stator punching sheets of different models and separate blanking, and the manufacturing cost of a single set of die can be reduced. The stator punching sheet is suitable for the condition that the stator punching sheets have the same shape and the two punching sheet models are required to be produced. Similarly, at least one empty position may be set in step S2, the blanking positions are staggered by controlling the position distribution of the mold, and the conveying devices are respectively set at the blanking positions of the two rows of strip 10 rotors, so as to perform synchronous production of rotor punching sheets of different models.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a new form brushless DC motor's stator core, includes a plurality of range upon range of towards the piece, its characterized in that, it contains rectangular bodily structure to towards the piece, four bights of bodily structure are provided with fillet structure, all be provided with trapezoidal protruding structure on four sides of bodily structure, the thickness of trapezoidal protruding structure with the thickness of bodily structure equals, four bights of bodily structure all open the mounting hole, it has along circular array's 9 towards the piece groove to open on the piece, and is adjacent the parallel and equidistance setting in side of piece groove, 9 the central point in piece groove puts and opens there is the stator hole, every towards the piece groove with all open the wiring mouth between the stator hole, range upon range of be provided with welded structure on two relative sides towards the piece.

2. The stator core of the new dc brushless motor according to claim 1, wherein the main structure is square, the stator inner hole is located at the center of the main structure, and the diameter of the stator inner hole is 0.5-0.7 times the side length of the main structure.

3. The stator core of the new type of dc brushless motor as claimed in claim 2, wherein the height of the trapezoid protrusions is 0.03-0.08 times of the side length of the main body, the two sides of each trapezoid protrusion are respectively provided with a rivet joint, the corners of the trapezoid protrusions are provided with the fillet structures, the connecting transition portion between the trapezoid protrusions and the main body is an arc structure, and the thickness of the stator core is 0.2-0.5 times of the side length.

4. The stator core of the new dc brushless motor according to claim 1, wherein the trapezoidal convex structures comprise two left and right convex structures and two front and rear convex structures, and a sum of a top side and a bottom side of each of the front and rear convex structures is smaller than or equal to a distance between top sides of the two left and right convex structures.

5. The new dc brushless motor stator core according to claim 1, wherein the welding structure comprises two parallel welding slots, the welding slots being disposed on the left and right sides of the trapezoidal protruding structure.

6. The new dc brushless motor stator core as claimed in claim 1, wherein the sheet punching slot comprises a top surface, a bottom surface and two side surfaces, and the width of the wiring opening is less than half of the width of the top surface of the sheet punching slot.

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