阅读说明：本技术 一种定子叠片机构及其叠片工艺 (Stator lamination mechanism and lamination process thereof ) 是由 唐海军 陈永法 蒋建龙 于 2020-06-11 设计创作，主要内容包括：本发明涉及一种定子叠片机构及其叠片工艺,所述机构包含有设置于液压机活塞杆端部的上模和设置于液压机底座上的下模,上模位于下模的正上方,上模在立柱上上下升降；所述定子叠片机构中的定子外缘一圈开设有多个均匀分布的凹字形缺口,多片定子叠加后的凹字形缺口形成定子叠片上的凹槽,所述凹槽中嵌有U形的金属压紧带,金属压紧带将定子叠片固定；金属压紧带上下两端的搭扣分别搭在定子叠片的顶面和底面；底座上方设置有升降圆环,升降圆环通过升降柱上下升降,升降圆环上设置有滚动组件,滚动组件中的滚轮将金属压紧带压紧于定子叠片的凹槽中。本发明涉及一种定子叠片机构及其叠片工艺,叠片叠加更紧密,叠片内缘尺寸一致,工作效率高。(The invention relates to a stator lamination mechanism and a lamination process thereof, wherein the mechanism comprises an upper die arranged at the end part of a piston rod of a hydraulic machine and a lower die arranged on a base of the hydraulic machine, wherein the upper die is positioned right above the lower die, and the upper die is lifted up and down on an upright post; a plurality of uniformly distributed concave-shaped notches are formed in one circle of the outer edge of a stator in the stator lamination mechanism, the concave-shaped notches formed by the superposition of a plurality of stators form a groove in the stator lamination, a U-shaped metal pressing belt is embedded in the groove, and the stator lamination is fixed by the metal pressing belt; the hasps at the upper end and the lower end of the metal compression belt are respectively lapped on the top surface and the bottom surface of the stator lamination; the base top is provided with the lift ring, and the lift ring passes through the lift post oscilaltion, is provided with the rolling subassembly on the lift ring, and the gyro wheel among the rolling subassembly compresses tightly the metal compression band in the recess of stator lamination. The invention relates to a stator lamination mechanism and a lamination process thereof, which have the advantages of tighter lamination stack, consistent dimension of the inner edge of the lamination and high working efficiency.)

1. A stator lamination process is characterized in that: the process comprises the following steps:

step 1: manually knocking and embedding the metal compression belt (6) into the groove of the stator lamination;

step 2: manually inserting and sleeving the stator lamination in the fixed shaft (3), and embedding a hasp (6.1) at the lower end of the metal pressing belt (6) of the stator lamination into a hasp groove (12.1) of the support lamination (12);

and step 3: the hydraulic press driving device drives an upper die (1) at the end part of the piston rod to press downwards, a telescopic shaft (3.1) at the upper end of a fixed shaft (3) retracts, the upper die (1) clamps an exposed part at the upper end of the fixed shaft (3), and the lower end of a first spring part (8) of the upper die (1) tilts and abuts against the front end of the upper surface of a hasp (6.1) at the upper end of a metal pressing belt (6);

and 4, step 4: the lifting column (5) drives the lifting ring (4) to ascend, the roller (10.1) ascends to a first spring part (8) of the upper die (1) along a second spring part (13) of the lower die (2), the metal pressing belt (6) is pressed in a groove of the stator lamination in the ascending process of the roller (10.1), the lower end of the first spring part (8) is inwards pushed to the upper end face of a hasp (6.1) at the lower end of the metal pressing belt (6), the lower end of the first spring part (8) downwards presses the upper end face of the hasp (6.1), and the hasp (6.1) is attached to the upper end face of the stator lamination from outside to inside;

and 5: the lifting column (5) drives the lifting circular ring (4) to descend, and the roller (10.1) moves downwards to return to the original position;

step 6: the lower end of a first spring part (8) of the upper die (1) is bounced, and meanwhile, the upper die (1) loosens the fixed shaft (3) and rises to return to the original position;

and 7: and manually taking down the compressed stator lamination.

2. A stator lamination mechanism, comprising: the hydraulic press comprises an upper die (1) arranged at the end part of a piston rod of a hydraulic press and a lower die (2) arranged on a base (7) of the hydraulic press, wherein the upper die (1) is positioned right above the lower die (2), and a driving device of the hydraulic press drives the upper die (1) to lift up and down on a vertical column (9); a plurality of uniformly distributed concave-shaped notches are formed in one circle of the outer edge of a stator in the stator lamination mechanism, the concave-shaped notches formed by the superposition of a plurality of stators form a groove in a stator lamination, and a U-shaped metal compression belt (6) is embedded in the groove; hasps (6.1) at the upper end and the lower end of the metal compression belt (6) are respectively lapped on the top surface and the bottom surface of the stator lamination;

the upper die (1) is cylindrical, a plurality of vertical first spring parts (8) are uniformly distributed at the lower part of the circumferential surface of the upper die (1), the number of the first spring parts (8) is more than or equal to that of the metal compression belts (6), the first spring parts (8) are embedded into the circumferential surface of the upper die (1), the upper ends of the first spring parts (8) are hinged to the upper die (1) through bolts, and the lower ends of the first spring parts (8) can be bounced; the lower end of a first spring part (8) on the upper die (1) is vertically aligned with the groove of the stator lamination, and the lower end of the first spring part (8) abuts against the front end of the upper surface of the hasp (6.1) at the upper end of the metal pressing belt (6);

the lower die (2) is cylindrical, a fixed shaft (3) is inserted in the lower die (2), the fixed shaft (3) consists of three fan-shaped shafts, and gaps exist among the three fan-shaped shafts; a telescopic shaft (3.1) is inserted into the fixed shaft (3), and the outer diameter of the telescopic shaft (3.1) is larger than the inner hole of the fixed shaft (3); a plurality of vertical second spring parts (13) are uniformly distributed on the circumferential surface of the lower die (2), the lower ends of the second spring parts (13) are hinged to the lower die (2) through bolts, and the second spring parts (13) are embedded into the circumferential surface of the lower die (2); the number of the second spring elements (13) is more than or equal to that of the metal pressing belts (6); a supporting lamination (12) is arranged above the lower die (2), a buckle groove (12.1) aligned with a second spring part (13) of the lower die (2) is formed in the upper end face of the outer edge of the supporting lamination (12), and a lower end buckle (6.1) of a metal pressing belt (6) of the stator lamination is embedded into the buckle groove (12.1);

a lifting circular ring (4) is arranged above a base (7) of the hydraulic machine, two sides of the lifting circular ring (4) are connected with vertical lifting columns (5), the lifting columns (5) are driven by a hydraulic cylinder of the hydraulic machine to lift, and the lifting columns (5) drive the lifting circular ring (4) to do lifting motion; the bottoms of the four upright posts (9) penetrate through the lifting circular ring (4) to be fixed on the base (7); the lower die (2) is positioned in an inner hole of the lifting circular ring (4);

a plurality of rolling assemblies (10) are uniformly distributed on the upper surface of the lifting ring (4), and the number of the rolling assemblies (10) is more than or equal to that of the second spring parts (13); the rolling assembly (10) comprises a fixing piece (10.2), a notch is formed in the front end of the fixing piece (10.2), a roller (10.1) is arranged in the notch, the roller (10.1) is fixed in the notch through a bolt and rotates in the notch, the rolling surface of the roller (10.1) abuts against the lower end surface of a second spring piece (13) of the lower die (2), and the roller (10.1) rolls upwards along the second spring piece (13) of the lower die (2) to press a metal pressing belt (6) of a stator lamination; the thickness of the roller (10.1) is smaller than the width of the metal pressing belt (6).

3. A stator lamination mechanism according to claim 2, wherein: the fixing piece (10.2) is arranged in a strip-shaped groove (11) formed in the lifting circular ring (4), a plurality of bolt positioning holes (11.1) arranged front and back are formed in the strip-shaped groove (11), a strip-shaped through hole (10.4) is formed in the middle of the fixing piece (10.2), and the fixing piece (10.2) is fixed in the strip-shaped groove (11) by inserting a fastening bolt (10.3) into the strip-shaped through hole (10.4) of the fixing piece (10.2) and the bolt positioning hole (11.1) of the strip-shaped groove (11).

4. A stator lamination mechanism according to claim 2, wherein: adjusting bolts (10.5) are screwed at the rear ends of the fixing pieces (10.2), the rear ends of the adjusting bolts (10.5) are screwed in the fixing blocks (10.6), and the fixing blocks (10.6) are fixed on the lifting circular ring (4) through bolts.

5. A stator lamination mechanism according to claim 3, wherein: the strip-shaped grooves (11) are multiple.

6. A stator lamination mechanism according to claim 2, wherein: four upright posts (9) are arranged.

7. A stator lamination mechanism according to claim 2, wherein: the rolling assembly (10) is positioned between two adjacent upright posts (9).

Technical Field

The invention relates to a stator lamination mechanism and a lamination process thereof.

Background

The stator core is an important component of the motor, is formed by stacking silicon steel laminations and mainly has the following main functions: when the motor is in a power generation state, magnetic induction lines generated by the rotor form a closed loop, and the electromagnetic lines wound in the tooth grooves of the stator core cut the magnetic induction lines generated by the rotor, so that induced current is generated in the electromagnetic lines; when the motor is in an electric state, the electromagnetic wire wound in the iron core tooth socket induces the iron core tooth socket into a magnetic pole to attract and repel the magnetic pole of the rotor when being electrified, and the rotor is pushed and pulled to rotate, so that the rotor shaft outputs power outwards.

The previous lamination work of the stator laminations has the following drawbacks:

1. the stator laminations are not stacked tightly enough in the stacking process, so that the quality of a stator core is poor;

2. the inner circle size and the aperture of the stator lamination are not consistent, so that the use effect of the stator core in the motor is influenced;

3. the stator lamination mechanism has low working efficiency and needs manual repeated inspection.

Disclosure of Invention

The invention aims to overcome the defects and provide a stator lamination mechanism which has the advantages of more compact lamination of stator laminations, consistent size of inner edges of the laminations and high working efficiency.

The purpose of the invention is realized as follows:

a stator lamination process, the process steps comprising:

step 1: manually knocking and embedding the metal compression belt into the groove of the stator lamination;

step 2: manually inserting and sleeving the stator lamination in the fixed shaft, and embedding a hasp at the lower end of a metal pressing belt of the stator lamination into a hasp groove of the support lamination;

and step 3: the hydraulic press driving device drives an upper die at the end part of the piston rod to press downwards, a telescopic shaft at the upper end of the fixed shaft retracts, the upper die clamps the exposed part at the upper end of the fixed shaft, and the lower end of a first spring part of the upper die is tilted and abuts against the front end of the upper surface of a hasp at the upper end of the metal pressing belt;

and 4, step 4: the lifting column drives the lifting ring to rise, the roller wheel rises to the first spring part of the upper die along the second spring part of the lower die, the metal pressing belt is pressed in the groove of the stator lamination in the rising process of the roller wheel, the lower end of the first spring part is pushed inwards to the upper end face of the hasp at the lower end of the metal pressing belt, the lower end of the first spring part presses the upper end face of the hasp downwards, and the hasp is attached to the upper end face of the stator lamination from outside to inside;

and 5: the lifting column drives the lifting ring to descend, and the roller moves downwards to return to the original position;

step 6: the lower end of the first spring part of the upper die bounces, and meanwhile, the upper die loosens the fixed shaft and rises to return to the original position;

and 7: and manually taking down the compressed stator lamination.

A stator lamination mechanism comprises an upper die and a lower die, wherein the upper die is arranged at the end part of a piston rod of a hydraulic machine, the lower die is arranged on a base of the hydraulic machine, the upper die is positioned right above the lower die, and a hydraulic machine driving device drives the upper die to lift up and down on an upright post; a plurality of uniformly distributed concave-shaped notches are formed in one circle of the outer edge of a stator in the stator lamination mechanism, the concave-shaped notches formed by the superposition of a plurality of stators form a groove in a stator lamination, and a U-shaped metal compression belt is embedded in the groove; the hasps at the upper end and the lower end of the metal compression belt are respectively lapped on the top surface and the bottom surface of the stator lamination;

the upper die is cylindrical, a plurality of vertical first spring parts are uniformly distributed at the lower part of the circumferential surface of the upper die, the number of the first spring parts is more than or equal to that of the metal compression belts, the first spring parts are embedded into the circumferential surface of the upper die, the upper ends of the first spring parts are hinged to the upper die through bolts, and the lower ends of the first spring parts can be bounced; the lower end of a first spring part on the upper die is vertically aligned with the groove of the stator lamination, and the lower end of the first spring part abuts against the front end of the upper surface of the buckle at the upper end of the metal compression belt;

the lower die is cylindrical, a fixed shaft is inserted in the lower die and consists of three fan-shaped shafts, and gaps exist among the three fan-shaped shafts; a telescopic shaft is inserted into the fixed shaft, and the outer diameter of the telescopic shaft is larger than the inner hole of the fixed shaft; a plurality of vertical second spring parts are uniformly distributed on the circumferential surface of the lower die, the lower ends of the second spring parts are hinged to the lower die through bolts, and the second spring parts are embedded into the circumferential surface of the lower die; the number of the second spring parts is more than or equal to that of the metal pressing belts; a supporting lamination is arranged above the lower die, a hasp groove aligned with the second spring part of the lower die is formed in the upper end face of the outer edge of the supporting lamination, and a hasp at the lower end of a metal pressing belt of the stator lamination is embedded into the hasp groove;

a lifting circular ring is arranged above a base of the hydraulic machine, two sides of the lifting circular ring are connected with vertical lifting columns, the lifting columns are driven by a hydraulic cylinder of the hydraulic machine to lift, and the lifting columns drive the lifting circular ring to do lifting motion; the bottoms of the four upright posts penetrate through the lifting circular ring and are fixed on the base; the lower die is positioned in an inner hole of the lifting circular ring;

a plurality of rolling assemblies are uniformly distributed on the upper surface of the lifting circular ring, and the number of the rolling assemblies is more than or equal to that of the second spring parts; the rolling assembly comprises a fixing piece, a notch is formed in the front end of the fixing piece, a roller is arranged in the notch, the roller is fixed in the notch through a bolt and rotates in the notch, the rolling surface of the roller abuts against the lower end surface of a second spring part of the lower die, and the roller rolls upwards along the second spring part of the lower die to press a metal pressing belt of the stator lamination; the thickness of the roller is smaller than the width of the metal pressing belt.

According to the stator lamination mechanism, the fixing piece is arranged in the strip-shaped groove formed in the lifting ring, the strip-shaped groove is internally provided with the plurality of bolt positioning holes which are arranged in the front and back direction, the middle of the fixing piece is provided with the strip-shaped through hole, and the fastening bolt is inserted into the strip-shaped through hole of the fixing piece and the bolt positioning holes of the strip-shaped groove to fix the fixing piece in the strip-shaped groove.

According to the stator lamination mechanism, the rear end of the fixing piece is screwed with the adjusting bolt, the rear end of the adjusting bolt is screwed in the fixing block, and the fixing block is fixed on the lifting ring through the bolt.

The invention relates to a stator lamination mechanism, which is characterized in that a plurality of strip-shaped grooves are formed.

The invention relates to a stator lamination mechanism, which is characterized in that four upright posts are arranged.

According to the stator lamination mechanism, the rolling assembly is positioned between two adjacent upright columns.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the stator lamination mechanism, the upper die and the lower die which are matched with each other are arranged on the hydraulic press, a worker strikes the metal pressing belt to be embedded into the groove of the stator lamination, then the stator lamination is placed on the lower die, and the metal pressing belt is pressed into the groove from bottom to top through the roller on the lifting circular ring, so that the compactness between the stator and the stator is enhanced;

2. the fixed shaft in the lower die of the stator lamination mechanism is composed of three fan-shaped shafts, when a roller rolls upwards to compress a metal compression belt of stator laminations, the telescopic shaft at the upper end of the fixed shaft retracts downwards into the fixed shaft, and the fixed shaft expands outwards due to the fact that the outer diameter of the telescopic shaft is slightly larger than the inner hole of the fixed shaft, so that the stator laminations with different inner diameters are pushed outwards, the sizes of the inner circles of the stator laminations are consistent, and the product quality is guaranteed;

3. according to the stator lamination process, workers only need to knock the metal compression belt to be embedded into the grooves of the stator laminations, and then the metal compression belt automatically works through the hydraulic machine, so that the labor is saved, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a stator lamination mechanism according to the present invention.

Fig. 2 is a schematic structural view of the upper mold in fig. 1.

Fig. 3 is a schematic structural view of the lifting ring in fig. 1.

Fig. 4 is a partially enlarged schematic view of the lower mold shown in fig. 3.

Fig. 5 is a schematic structural diagram of the rolling assembly in fig. 3.

Fig. 6 is a schematic structural view of the fixing shaft in fig. 1.

Fig. 7 is a schematic view of a metal hold down strap of a stator lamination mechanism of the present invention.

Fig. 8 is a diagram of the position relationship between the first spring element and the metal compression band of the stator lamination mechanism of the present invention.

Wherein: go up mould 1, lower mould 2, fixed axle 3, telescopic shaft 3.1, lift ring 4, lift post 5, metal compression band 6, hasp 6.1, base 7, spring part 8, stand 9, rolling component 10, gyro wheel 10.1, mounting 10.2, fastening bolt 10.3, bar through-hole 10.4, adjusting bolt 10.5, fixed block 10.6, bar groove 11, bolt locating hole 11.1, support lamination 12, hasp groove 12.1, spring part 13 No. two.

Detailed Description

Referring to fig. 1 to 8, the stator lamination mechanism and the lamination process thereof according to the present invention comprise the following steps:

step 1: manually knocking and embedding the metal compression belt 6 into the groove of the stator lamination;

step 2: manually inserting and sleeving the stator lamination in the fixed shaft 3, and embedding a hasp 6.1 at the lower end of a metal pressing belt 6 of the stator lamination into a hasp groove 12.1 of the support lamination 12;

and step 3: the hydraulic press driving device drives an upper die 1 at the end part of the piston rod to press downwards, a telescopic shaft 3.1 at the upper end of a fixed shaft 3 retracts, the upper die 1 clamps an exposed part at the upper end of the fixed shaft 3, and the lower end of a first spring part 8 of the upper die 1 is tilted and abuts against the front end of the upper surface of a hasp 6.1 at the upper end of a metal pressing belt 6;

and 4, step 4: the lifting column 5 drives the lifting ring 4 to rise, the roller 10.1 rises to the first spring part 8 of the upper die 1 along the second spring part 13 of the lower die 2, the metal pressing belt 6 is pressed in the groove of the stator lamination in the rising process of the roller 10.1, the lower end of the first spring part 8 is pushed inwards to the upper end face of the hasp 6.1 at the lower end of the metal pressing belt 6, the lower end of the first spring part 8 presses the upper end face of the hasp 6.1 downwards, and the hasp 6.1 is attached to the upper end face of the stator lamination from outside to inside;

and 5: the lifting column 5 drives the lifting ring 4 to descend, and the roller 10.1 moves downwards to return to the original position;

step 6: the lower end of the first spring part 8 of the upper die 1 is bounced, and meanwhile, the upper die 1 loosens the fixed shaft 3 and rises to return to the original position;

and 7: and manually taking down the compressed stator lamination.

The stator lamination process is based on a stator lamination mechanism and comprises an upper die 1 arranged at the end part of a piston rod of a hydraulic machine and a lower die 2 arranged on a base 7 of the hydraulic machine, wherein the upper die 1 is positioned right above the lower die 2, and a hydraulic machine driving device drives the upper die 1 to lift up and down on a vertical column 9; four upright posts 9 are arranged; a plurality of uniformly distributed concave-shaped notches are formed in one circle of the outer edge of a stator in the stator lamination mechanism, the concave-shaped notches formed by the superposition of a plurality of stators form a groove in the stator lamination, a U-shaped metal pressing belt 6 is embedded in the groove, and the stator lamination is fixed by the metal pressing belt 6; hasps 6.1 at the upper end and the lower end of the metal compression belt 6 are respectively lapped on the top surface and the bottom surface of the stator lamination;

the upper die 1 is cylindrical, a plurality of vertical first spring parts 8 are uniformly distributed at the lower part of the circumferential surface of the upper die 1, the number of the first spring parts 8 is more than or equal to that of the metal pressing belts 6, the first spring parts 8 are embedded into the circumferential surface of the upper die 1, the upper ends of the first spring parts 8 are hinged to the upper die 1 through bolts, and the lower ends of the first spring parts 8 can be bounced; the lower end of a first spring part 8 on the upper die 1 is vertically aligned with the groove of the stator lamination, and the lower end of the first spring part 8 abuts against the front end of the upper surface of the hasp 6.1 at the upper end of the metal pressing belt 6;

the lower die 2 is cylindrical, a fixed shaft 3 is inserted in the lower die 2, the fixed shaft 3 is used for sleeving stator laminations, a telescopic shaft 3.1 is inserted in the fixed shaft 3, and the outer diameter of the telescopic shaft 3.1 is slightly larger than the inner hole of the fixed shaft 3; a plurality of vertical second spring parts 13 are uniformly distributed on the circumferential surface of the lower die 2, the lower ends of the second spring parts 13 are hinged to the lower die 2 through bolts, and the second spring parts 13 are embedded into the circumferential surface of the lower die 2; the number of the second spring pieces 13 is more than or equal to that of the metal pressing belts 6; a supporting lamination 12 is arranged above the lower die 2, a hasp groove 12.1 aligned with a second spring part 13 of the lower die 2 is formed in the upper end face of the outer edge of the supporting lamination 12, and a lower end hasp 6.1 of a metal pressing belt 6 of the stator lamination to be pressed is embedded into the hasp groove 12.1; the lower die 2, the supporting lamination 12 and the stator lamination needing to be pressed are all sleeved on the fixed shaft 3;

a lifting circular ring 4 is arranged above a base 7 of the hydraulic machine, two sides of the lifting circular ring 4 are connected with vertical lifting columns 5, the lifting columns 5 are driven by a hydraulic cylinder of the hydraulic machine to lift, and then the lifting columns 5 drive the lifting circular ring 4 to do lifting motion; the bottoms of the four upright posts 9 penetrate through the lifting circular ring 4 and are fixed on the base 7; the lower die 2 is positioned in an inner hole of the lifting circular ring 4;

a plurality of rolling assemblies 10 are uniformly distributed on the upper surface of the lifting ring 4, and the number of the rolling assemblies 10 is more than or equal to that of the second spring parts 13; the rolling assembly 10 comprises a fixing piece 10.2, a notch is formed in the front end of the fixing piece 10.2, a roller 10.1 is arranged in the notch, the roller 10.1 is fixed in the notch through a bolt and rotates in the notch, the rolling surface (circumferential surface) of the roller 10.1 abuts against the lower end surface of a second spring piece 13 of the lower die 2, and the roller 10.1 rolls upwards along the second spring piece 13 of the lower die 2 to press the metal pressing belt 6 of the stator lamination; the thickness of the roller 10.1 is smaller than the width of the metal pressing belt 6; the fixing piece 10.2 is arranged in a strip-shaped groove 11 formed in the lifting ring 4, a plurality of bolt positioning holes 11.1 which are arranged in the front and back are formed in the strip-shaped groove 11, a strip-shaped through hole 10.4 is formed in the middle of the fixing piece 10.2, and a fastening bolt 10.3 is inserted into the strip-shaped through hole 10.4 of the fixing piece 10.2 and the bolt positioning hole 11.1 of the strip-shaped groove 11 to fix the fixing piece 10.2 in the strip-shaped groove 11; an adjusting bolt 10.5 is screwed at the rear end of the fixing piece 10.2, the rear end of the adjusting bolt 10.5 is screwed in a fixing block 10.6, and the fixing block 10.6 is fixed on the lifting ring 4 through a bolt; the adjusting bolt 10.5 is rotated to adjust the distance between the front end of the fixing piece 10.2 and the lower die 2, and then the fastening bolt 10.3 is inserted into bolt positioning holes 11.1 at different positions to adjust the position of a roller 10.1 at the front end of the fixing piece 10.2 away from the lower die 2 so as to adapt to the lower dies 2 with different outer diameters, namely to adapt to stator laminations with different outer diameters;

the rolling assembly 10 is positioned between two adjacent upright posts 9;

the plurality of strip-shaped grooves 11 facilitate the replacement of the rolling assembly 10;

the fixed shaft 3 consists of three fan-shaped shafts, and gaps exist among the three fan-shaped shafts; before the roller 10.1 rolls upwards to compress the metal compression belt 6 of the stator lamination, the telescopic shaft 3.1 at the upper end of the fixed shaft 3 retracts downwards into the fixed shaft 3, and the outer diameter of the telescopic shaft 3.1 is slightly larger than the inner hole of the fixed shaft 3, so that the fixed shaft 3 can expand outwards to tightly support the stator lamination outwards, and the inner circles of the lamination are consistent.

In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.