TW202241017A - Coil insertion device - Google Patents

Abstract

This coil insertion device inserts, from one axial direction side toward the other axial direction side, coils into a plurality of slots penetrating a stator core in the axial direction, each coil being configured by a coil wire wound in a ring shape. The coil insertion device comprises: a coil moving mechanism that is arranged radially inward of the stator core, that moves in the axial direction, and that moves the coils; a plurality of blades that are arranged along the circumferential direction of the stator core radially inward of the stator core and radially outward of the coil moving mechanism, that extend along the axial direction of the stator core.

Description

Stator and stator manufacturing method

The present invention relates to a stator and a method of manufacturing the stator.

Conventionally, there is known a stator including a stator core having pole teeth and a coil wire having slots disposed between the pole teeth. As the above-mentioned stator, for example, Japanese Patent Application Laid-Open No. 2001-298917 (Patent Document 1) discloses a configuration in which pole teeth are bent in the circumferential direction and coil wires are wound around the pole teeth.

prior art literature Patent Document 1: Japanese Patent Laid-Open No. 2001-298917.

Patent Document 1 discloses a technique for suppressing a dead space of a coil wire in a slit to improve a space factor. The inventors of the present invention have made it a technical problem to improve the space factor from a viewpoint different from that of the above-mentioned Patent Document 1.

An object of the present invention is to provide a stator and a method of manufacturing the stator with an improved space factor.

A first aspect of the present invention provides a stator including: a stator core having a plurality of slots penetrating in the axial direction; and a plurality of coil wires arranged in the slots, The cross-sectional shape of the coil wire is circular, and the side surfaces of both ends of the groove in the circumferential direction are planes extending in the axial direction with a constant circumferential width from the radially inner end to the radially outer end.

A second aspect of the present invention provides a manufacturing method of a stator, the stator includes a stator core having a plurality of slots penetrating in the axial direction, the manufacturing method of the stator includes: A process of winding a circular coil wire in a ring shape to form a coil; and a process of inserting the coil into a slot whose sides in the circumferential direction have a constant circumferential direction from the radially inner end to the radially outer end. width and a plane extending along the axial direction.

The present invention can provide a stator with improved space factor and a manufacturing method of the stator.

Embodiments of the present invention will be described below based on the drawings. In addition, in the following drawings, the same reference numerals are assigned to the same or corresponding parts, and description thereof will not be repeated.

In addition, in the following description, the direction in which the central axis of the stator 1 extends, that is, the direction in which the slot 24 penetrates is referred to as an "axial direction". Let one side along the axial direction be the lower (rear) side, and the other side be the upper (front) side. The up-down (front-back) direction is used to specify a positional relationship, not to limit the actual direction. That is, the downward direction does not necessarily mean the direction of gravity. The axial direction is not particularly limited, and includes a vertical direction, a horizontal direction, a direction intersecting the vertical direction and the horizontal direction, and the like.

Moreover, let the direction orthogonal to the central axis line of the stator 1 be called "radial direction." In addition, let the direction along the circular arc centered on the central axis line of the stator 1 be "circumferential direction".

In addition, in the drawings used in the following description, for the purpose of emphasizing a characteristic part, a characteristic part may be enlarged and shown for convenience. Therefore, the size and ratio of each structural element are not necessarily the same as the actual ones. In addition, illustration of non-characteristic parts may be omitted for the same purpose.

(stator) As shown in FIGS. 1 and 2 , the stator 1 is a component of the motor, and interacts with a rotor (not shown) to generate rotational torque. The stator 1 according to the present embodiment is provided with distributed winding in which the coil wire is wound across the plurality of slits 24 . The stator 1 includes coils 10 , a stator core 20 , wedges 30 and insulating paper 40 .

＜Coil＞ The coil 10 is formed by winding a coil wire 11 in a ring shape. The coil wire 11 is a coil wire having a circular cross-sectional shape (hereinafter also referred to as “round wire”).

The coil 10 has two coil sides and a coil bridge. The two coil sides are accommodated in the slot 24 . In FIGS. 1 and 2 , the coil wire 11 arranged in the slot 24 is a coil side portion of the coil 10 . The diameters of the coil wires 11 shown in FIG. 1 and FIG. 2 are all the same.

Specifically, the slot 24 in which one coil side is accommodated is different from the slot 24 in which the other coil side is accommodated. The slit 24 that accommodates one coil edge and the slit 24 that accommodates the other coil edge may be disposed along the circumferential direction via other slits as shown in FIG. 1 , or may be adjacent to each other (not shown). ).

The coil jumper connects the two coil sides. In addition, the coil bridges are arranged on both axial sides of the stator core 20 . Specifically, the coil bridging portion located on the axially upper side is an upper coil side end connecting the upper ends of the two coil side portions. The coil bridging portion located on the axially lower side is a lower coil side end connecting the lower ends of the coil side portions.

＜Stator Core＞ The stator core 20 is of an integral type. The stator core 20 is formed in a hollow cylindrical shape. The stator core 20 is formed by stacking thin silicon steel sheets. The stator core 20 includes a core back 21 , a plurality of pole teeth 22 , a plurality of umbrellas 23 and a plurality of slots 24 .

The back of the core is ring-shaped. A plurality of pole teeth 22 extends radially from the core back 21 . In addition, a plurality of pole teeth 22 are arranged along the circumferential direction.

The umbrella 23 is connected to the radially inner end of the pole tooth 22 and extends to both sides in the circumferential direction. The circumferential width of the umbrella 23 is larger than the circumferential width of the radially inner ends of the pole teeth 22 .

A plurality of slots 24 are provided between pole teeth 22 adjacent in the circumferential direction. In addition, a plurality of slots 24 penetrates in the axial direction. The notch 24 in this embodiment has a substantially rectangular shape when viewed in the axial direction.

As shown in FIG. 2 , the slot 24 has a slot opening 241 , a side surface 242 , a radially outer end surface 243 , a first connecting portion 244 and a second connecting portion 245 . The slot opening 241 is located at the radially inner end. The side faces 242 are located at both ends in the circumferential direction. The radially outer end surface 243 is located at the radially outer end. The first connection portion 244 connects the radially outer end surface 243 and the side surface 242 . The second connecting portion 245 connects the slotted opening 241 and the side surface 242 . In this embodiment, the outer shape of the slot 24 is defined by the slot opening 241 , the side surface 242 , the radially outer end surface 243 , the first connecting portion 244 and the second connecting portion 245 .

The slit opening 241 is formed radially inside and opens radially. The circumferential width of the slot opening 241 is smaller than the circumferential width of the space in the slot 24 for accommodating the coil edge.

The side faces 242 are located at both ends in the circumferential direction. Here, two side surfaces 242 are arranged. The side surface 242 is a flat surface having a constant circumferential width from a radially inner end to a radially outer end and extending in the axial direction. The side surface 242 of the present embodiment is formed of a plane.

In FIG. 2 , the two sides 242 are located at the circumferential outer ends of the slot 24 . That is, only two side faces 242 are located at the circumferential outer ends. The circumferential width of the two side faces 242 is always constant.

The radially outer end surface 243 is a surface located at the radially outer end. The radially outer end surface 243 in this embodiment is a plane located at the radially outer end and extending in the axial direction. In addition, the radially outer end surface 243 is formed of a flat surface. The radially outer end surface 243 and the side surface 242 are orthogonal to each other.

The first connecting portion 244 connects the circumferential ends of the radially outer end surface 243 and the radially outer end of the side surface 242 . Here, two first connection parts 244 are arranged.

The first connecting portion 244 has a rounded shape with the radius of curvature equal to the sum of the radius of the coil wire 11 and the thickness of the insulating paper 40 . Thereby, the coil wire 11 can be arrange|positioned in the 1st connection part 244, Therefore The space factor can be improved further. The radius of curvature is preferably around 0.6 mm.

The second connecting portion 245 connects both circumferential ends of the slot opening 241 and the radial inner end of the side surface 242 . Here, two second connection parts 245 are arranged.

The second connection portion 245 has a rounded shape whose curvature radius is equal to or less than the sum of the radius of the coil wire 11 and the thickness of the insulating paper 40 . Thereby, the coil wire can be arrange|positioned in the 2nd connection part 245, Therefore The space factor can be improved further. In addition, the strength of the umbrella 23 can be increased. The radius of curvature is preferably not less than 0.6 mm and not more than 0.7 mm.

The slit 24 is shared with a coil wire having a quadrangular cross-sectional shape (hereinafter also referred to as “flat wire”). That is, the slit is configured such that flat wires and round wires can be arranged. Specifically, the round wire can be arranged in the slot 24 as shown in FIG. 2 , and the flat wire 12 can be arranged in the slot 24 as shown in FIG. 3 .

＜Wedge piece＞ The wedge 30 is disposed in the slot 24 . In this embodiment, the wedge 30 is arranged between the coil 10 arranged in the slot 24 and the slot opening 241 . The wedge 30 blocks the slot opening 241 . The wedge 30 insulates the stator core 20 from the coil 10 . The axial length of the wedge 30 is greater than the axial length of the slot 24 .

The wedge 30 of this embodiment has a U-shape when viewed in the axial direction. Specifically, it includes: a circumferential portion extending in the circumferential direction; and two radial portions extending radially outward from both ends of the circumferential portion. The circumferential portion and the radial portion may be composed of one member, or may be formed by connecting different members.

＜Insulation paper＞ The insulating paper 40 is arranged in the slot 24 . The insulating paper 40 covers the coil 10 inserted into the slot 24 . The insulating paper 40 is arranged along the pole teeth 22 that demarcate the radially inner space in the slit 24 . The insulating paper 40 of this embodiment has a U-shape. Specifically, as shown in FIG. 1 , it includes: a circumferential portion extending in the circumferential direction; and two radial portions extending radially inward from both ends of the circumferential portion. In FIG. 1 , the opening of the insulating paper 40 and the opening of the wedge 30 are opposite to each other. The thickness of the insulating paper 40 is not limited, for example, it is 0.2 mm.

In addition, the insulating paper 40 may also have a cuff portion (not shown) protruding from one axial end face of the stator core 20 and folded back, and the insulating paper 40 may also have a A cuff portion (not shown) that protrudes from the end face and is folded back.

＜Arrangement of Coil Wire＞ As shown in FIG. 2, the coil wire 11 of the coil 10 arrange|positioned in the slot 24 is formed in multiple layers X1-X5 arranged in a radial direction. The number of rows forming layers is not limited, but is preferably 4 or more and 6 or less, and more preferably 5 rows. In FIG. 2 , layers are referred to as X1 to X5 from the circumferential left to the circumferential right.

In layers adjacent in the circumferential direction, an array portion is formed in which the circumferential distance L between virtual lines V connecting the centers of the coil wires 11 is smaller than the diameter of the coil wire 11 . The alignment portion is a portion where the coil wires 11 are laminated in the slot 24 . In other words, the arrangement portion is arranged so that the three coil wires 11 are in contact with each other, and the centers C1, C2, and C3 of the three coil wires 11 form an equilateral triangle when viewed in the axial direction. Thereby, the coil wire can be laminated|stacked in the rectangular slit 24, Therefore The space factor can be improved further.

In the present embodiment, the arrangement portion is located radially outward. The radially outer side refers to a portion on the outer side of the radial center of the notch 24 . Coil wires are easily laminated on the outside in the radial direction of the slit 24, and thus the space factor can be easily improved.

In FIG. 2 , the alignment portion is located on the radially outer end surface 243 of the slot 24 . Thereby, the coil wire can be laminated|stacked on the radially outer end surface 243 of the slot 24, Therefore The space factor can be improved further. Here, the alignment portion is in contact with the insulating paper 40 arranged radially inward of the radially outer end surface 243 of the cutout 24 .

In the present embodiment, the arrangement portion is located radially inward. The term "radially inner side" refers to a portion located on the inner side of the radial center.

In FIG. 2 , the alignment portion is in contact with the wedge 30 . Thereby, the coil wire 11 can be laminated|stacked in the vicinity of the slit opening 241, Therefore The space factor can be further improved.

In addition, the coil wire 11 is in contact with the insulating paper 40 disposed radially inside the first connecting portion 244 . Here, the coil wires 11 in contact with the insulating paper 40 disposed radially inside the first connecting portion 244 constitute an arrangement portion.

Furthermore, the coil wire 11 is in contact with the insulating paper 40 (not shown) arranged radially inside the second connection portion 245 . The coil wires 11 in contact with the insulating paper 40 disposed radially inside the second connecting portion 245 constitute an arrangement portion.

In this embodiment, the layer X3 facing the slot opening 241 is in contact with the wedge member 30 , and the layers X2 and X4 adjacent to the layer X3 in the circumferential direction are in contact with the insulating paper disposed on the radially outer end surface 243 of the slot 24 . 40 contacts. In addition, here, the layer X3 facing the slit opening 241 is a layer located at the center in the circumferential direction. In addition, the layer X3 facing the slot opening 241 is not in contact with the insulating paper 40 disposed on the radially outer end surface 243 of the slot 24 . The layers X2 , X4 circumferentially adjacent to the layer X3 opposite the slot opening 241 are not in contact with the wedge 30 in FIG. 2 , but may also be in contact with the wedge 30 .

In addition, the layers X1 and X5 located at both ends in the circumferential direction are in contact with the insulating paper 40 arranged radially inward of the side surface 242 . Furthermore, the radially outermost coil wires 11 of the layers X1 and X5 located at both ends in the circumferential direction are in contact with the insulating paper 40 disposed radially inward of the first connecting portion 244 .

In addition, in FIG. 2 , the entire coil wire 11 constitutes the alignment portion, but a part of the coil wire 11 may constitute the alignment portion, and the remaining part may not constitute the alignment portion.

The radial width of the layer X3 facing the slot opening 241 in the radial direction is greater than or equal to the radial width of the layers X1 and X5 located at the circumferential ends of the slot 24 . In addition, in FIG. 2 , the radial width of the layer X3 radially opposed to the slot opening 241 is larger than the radial width of the layers X1 and X5 located at the circumferential ends of the slot 24 . Since a large number of coil wires 11 constituting the layer X3 radially opposed to the slot opening 24 can be arranged in the slot 24, the space factor can be improved.

In addition, the radial width of the layer X3 radially opposed to the slit opening 241 is greater than or equal to the radial width of the layers X2 and X4 adjacent to the layer X3 in the circumferential direction. In addition, in FIG. 2 , the radial width of the layer X3 , which is radially opposed to the slit opening 241 , is the same as the radial widths of the layers X2 , X4 .

(Stator manufacturing method) 1 , 2 and 4 , a method of manufacturing a stator 1 including a stator core 20 having a plurality of slots 24 penetrating in the axial direction according to the present embodiment will be described. In detail, a method for manufacturing a stator 1, the stator 1 includes an integral stator core 20, the stator core 20 includes: an annular core back 21; pole teeth 22, the pole teeth 22 are formed from the core The back 21 extends in the radial direction and is provided with a plurality of circumferentially; the umbrella 23 is connected to the radially inner end of the pole tooth 22 and extends to both sides in the circumferential direction; The slot 24 is arranged between the adjacent pole teeth 22 in the circumferential direction and penetrates in the axial direction.

As shown in FIG. 4 , first, the stator core 20 is formed (step S10 ). In the above process (S10), as shown in FIGS. 1 and 2 , the side surfaces 242 at both ends of the circumferential direction of the slot 24 are formed to have a constant circumferential width from the radially inner end to the radially outer end and along the axial direction. to the extended plane.

In addition, in this embodiment, before inserting the coil 10 mentioned later into the slot 24, the insulating paper 40 is arrange|positioned in the slot 24.

Furthermore, as shown in FIG. 4 , the coil wire 11 having a circular cross-sectional shape is wound into a loop to form the coil 10 (step S20 ). In the above process (S20), the coil wire 11 is wound into a ring shape to form a coil 10 having two coil side parts and a coil bridging part, the two coil side parts are accommodated in the slot 24, the The coil bridges connect the two coil sides and are arranged on both sides in the axial direction of the stator core 20 .

Next, the coil 10 is inserted into the slot 24 (step S30 ). In the said process (S30), it implements, for example as follows.

Specifically, the ring-shaped coil 10 formed in the step ( S20 ) is held by the vane arranged radially inward of the stator core 20 . Next, the coil 10 is moved in the axial direction by the coil moving mechanism arranged on the inner side in the radial direction of the blade. Specifically, the coil moving mechanism is moved from one axial side to the other axial side. Thus, the two coil sides of the coil 10 are arranged in the slots 24, and the coil bridging portion on one side in the axial direction straddles between the slots 24 on one side of the stator core 20, and the coil bridge on the other side The coil bridge spans between the slots 24 on the other side of the stator core 20 .

In addition, in the step ( S20 ) of the present embodiment, when inserting the coil 10 into the slit 24 , the wedge 30 is inserted together with the coil 10 .

By implementing the above steps ( S10 to S30 ), the stator 1 shown in FIGS. 1 and 2 can be manufactured.

As described above, according to the stator 1 and the method of manufacturing the stator 1 according to the present embodiment, the space factor can be improved by arranging the round wires in the slots 24 on the side surfaces having a constant circumferential width.

Specifically, the inventors of the present invention conducted earnest studies to increase the space factor of the round wire. As a result, by laminating the round wire on the rectangular cutout 24 in cross-sectional view, the space factor can be reduced from the conventional 54 % increased to 58%. The space factor is a value when 117 round wires with a diameter of 0.77 mm are stacked and inserted into the slot 24 in the five columns of layers X1 to X5. In addition, the space factor is obtained by (the total cross-sectional area of the coil wire 11 except the covering film)/(the cross-sectional area of the slot 24 except the wedge 30 and the insulating paper 40) when viewed in cross-section shown in FIG. 2 . area) to find the value.

Thus, the space factor can be improved by the shape of the slot 24 of this embodiment, and the arrangement|positioning of the coil wire 11 inserted in the slot 24. FIG.

(Modification 1) In the above-mentioned embodiment, the stator in which the coil wires 11 in the slot 24 are laminated as an example has been described as an example, but in the stator of the present invention, a part of the coil wire 11 in the slot 24 may be stacked, and All the coil wires 11 in the slot 24 may not be laminated as shown in FIG. 5 . In this modified example, as shown in FIG. 5 , the coil wires 11 in the slot 24 are aligned in the radial direction and the axial direction.

Specifically, as shown in FIG. 5 , the coil wire 11 arranged in the slit 24 is formed in multiple layers X1 to X4 aligned in the radial direction.

In addition, the four coil wires 11 are placed in contact with each other, and the centers C1, C2, C3, and C4 of the four coil wires 11 are arranged to form a square when viewed in the axial direction. In layers adjacent in the circumferential direction, the circumferential distance L between virtual lines V connecting the centers of the coil wire 11 is equal to the diameter of the coil wire 11 .

(Modification 2) In the above embodiment, the structure in which the radially outer end surface 243 is a plane has been described as an example, but the radially outer end surface of the present invention is not limited thereto. In this modified example, as shown in FIGS. 6 and 7 , the radial outer end surface 243 differs from the embodiment mainly in that it has a first surface 243 a and a second surface 243 b.

In detail, the slot 24 has a slot opening 241 , a side surface 242 , a first surface 243 a , a second surface 243 b , a first connecting portion 244 , a second connecting portion 245 and a third connecting portion 246 . The notch opening 241 , the side surface 242 and the second connecting portion 245 are the same as those of the above-mentioned embodiment. In this modified example, the outer shape of the slot 24 is defined by the slot opening 241 , the side surface 242 , the first surface 243 a , the second surface 243 b , the first connecting portion 244 , the second connecting portion 245 and the third connecting portion 246 .

The slit 24 has a convex shape protruding radially outward at the radially outer end by a first face 243a and a second face 243b extending in the axial direction. As shown in FIG. 7, at least one coil wire 11a is opposed to the first surface 243a and the second surface 243b. In this way, at the radially outer end of the slot 24, by arranging at least one coil wire 11a so as to face the first surface 243a and the second surface 243b constituting a convex shape protruding radially outward, the space can be further improved. coefficient.

In this embodiment, at least one coil wire 11a is in contact with the insulating paper 40 arranged radially inside the convex shape.

The coil wires 11 are juxtaposed along the convex shape. Here, the three coil wires 11 are aligned along the first surface 243a, and the three coil wires 11 are aligned along the second surface 243b.

In this modified example, the arrangement portion in which the coil wires 11 are stacked faces the first surface 243a and the second surface 243b. That is, the coil wire 11a facing the first surface 243a and the second surface 243b constitutes an arrangement portion. Here, the layer corresponding to the third connection portion 246 constitutes an alignment portion.

The first surface 243a and the second surface 243b may be curved surfaces, but they are flat surfaces in this modified example. In addition, when the first surface 243 a and the second surface 243 b are curved surfaces, they may be curved surfaces curved inwardly of the slot 24 or curved surfaces curved outward of the slot 24 .

The angle θ1 between the first surface 243a and the second surface 243b is preferably not less than 110 degrees and not more than 150 degrees, and is most preferably 120 degrees. The angle θ1 is an angle at which the extending direction of the first surface 243 a intersects the extending direction of the second surface 243 b.

The angle θ2 between the first surface 243 a and the side surface 242 and the angle θ3 between the second surface 243 b and the side surface 242 are preferably not less than 110 degrees and not more than 150 degrees, most preferably 120 degrees. The angle θ2 is an angle at which the extending direction of the first surface 243 a intersects the extending direction of the side surface 242 . The angle θ3 is an angle at which the extending direction of the second surface 243 b intersects the extending direction of the side surface 242 .

The first connecting portion 244 connects the first surface 243 a and the second surface 243 b to the side surface 242 . The first connecting portion 244 has a rounded shape with the radius of curvature equal to the sum of the radius of the coil wire 11 and the thickness of the insulating paper 40 .

The third connecting portion 246 connects the first surface 243a and the second surface 243b. That is, the third connecting portion 246 is a connecting portion connecting the first surface 243a and the second surface 243b. The third connection part 246 has a round shape. In FIG. 7, the radial position of the third connection portion 246 is the same as the radial position of the coil wire 11a.

In this modified example, the angle θ4 between the horizontal line W perpendicular to the virtual line V and the first surface 243 a is preferably 15 degrees or more and 35 degrees or less, most preferably 30 degrees. The angle θ5 between the horizontal line W perpendicular to the imaginary line V and the second surface 243 b is preferably not less than 15 degrees and not more than 35 degrees, and is most preferably 30 degrees. The angle θ4 is an angle at which the extending direction of the first surface 243a and the extending direction of the horizontal line W intersect. The angle θ5 is an angle at which the extending direction of the second surface 243 b and the extending direction of the horizontal line W intersect.

According to this modified example, at the radially outer end portion of the slot 24, the alignment portion can be configured to include the coil wire 11a, which is connected with the first surface 243a and the second surface 243a constituting a radially outwardly protruding convex shape. The two surfaces 243b are opposite to each other. Thereby, by making the coil wire 11a the starting point of lamination, an arrangement part can be formed easily. Thus, in this modified example, by forming the radial outer end portion of the slot 24 into a convex shape, the arrangement of the coil wire 11 can be restricted from the radial outer side. Therefore, the space factor can be further improved.

(Modification 3) In Modification 2 above, the radially outer end of the convex shape is positioned at the center in the circumferential direction, but the present invention is not limited thereto. In this modified example, as shown in FIG. 8 , the radially outer end of the convex shape is shifted from the center in the circumferential direction to one side (right side in FIG. 8 ) in the circumferential direction.

In this modified example, the number of rows of layers aligned in the radial direction is four. In addition, three coil wires 11 are aligned along the first surface 243a, and two coil wires 11 are aligned along the second surface 243b.

(Modification 4) In the above embodiment, as shown in FIG. 1 , the two slots 24 into which the coil is inserted are provided as one slot 24 and the other slot 24 sandwiching the four slots 24 , but the present invention is not limited thereto.

(Modification 5) In the above embodiment, the method of inserting one coil 10 into the two slots 24 has been described as an example. A plurality of coils 10 may be simultaneously inserted into four or more slots 24 .

It should be considered that the embodiments and modifications disclosed this time are illustrations in all points and not restrictive. The scope of the present invention is indicated by the claims rather than the above-described embodiments and modifications, and is intended to include all changes within the meaning and range equivalent to the claims.

1: Stator 10: Coil 11,11a: coil wire 12: Flat wire 20: Stator core 21: core back 22: polar teeth 23: Umbrella 24: Grooving 30: Wedge 40: insulating paper 241: Slot opening 242: side 243: radial outer end face 243a: The first side 243b: Second side 244: The first connecting part 245: The second connecting part 246: The third connection part (connection part) C1,C2,C3,C4: center L: Circumferential distance V: imaginary line W: horizontal line X1,X2,X3,X4,X5: layers θ1, θ2, θ3, θ4, θ5: angle S10, S20, S30: steps

FIG. 1 is a schematic diagram of a cross section perpendicular to the axial direction of a stator according to an embodiment. FIG. 2 is an enlarged view of FIG. 1 . Fig. 3 is an enlarged view of inserting a flat wire into a slot of the embodiment. FIG. 4 is a flowchart showing a method of manufacturing the stator according to the embodiment. FIG. 5 shows a stator of Modification 1, which is a schematic view corresponding to FIG. 2 . FIG. 6 shows a stator according to Modification 2, which is a schematic diagram corresponding to FIG. 2 . FIG. 7 shows a stator of Modification 2, which is an enlarged view of FIG. 6 . FIG. 8 shows a stator according to Modification 3, and is an enlarged view corresponding to FIG. 7 .

1: Stator

20: Stator core

22: polar teeth

23: Umbrella

24: Grooving

30: Wedge

40: insulating paper

241: Slot opening

242: side

243: radial outer end face

244: The first connecting part

245: The second connecting part

C1, C2, C3: center

L: Circumferential distance

V: imaginary line

X1,X2,X3,X4,X5: layers

Claims (12)

A stator comprising: a stator core having a plurality of slots penetrating in the axial direction; and A plurality of coil wires, a plurality of the coil wires are arranged in the slot, the cross-sectional shape of the coil wires is circular, The side surfaces of both ends of the slot in the circumferential direction are planes having a constant circumferential width from the radially inner end to the radially outer end and extending in the axial direction. The stator as claimed in claim 1, wherein, The coil wires are formed in a plurality of layers arranged side by side in the radial direction, and the adjacent layers in the circumferential direction are arranged in such a way that a circumferential distance between imaginary lines connecting centers of the coil wires is smaller than a diameter of the coil wires. department. The stator as claimed in claim 2, wherein, The arrangement portion is located radially outward. The stator as claimed in claim 3, wherein, The arrangement portion is located on the radially outer end surface of the slot. The stator according to any one of claims 2 to 4, wherein, A slot opening opening in the radial direction is formed on the radially inner side of the slot, The radial width of the layer radially opposite to the opening of the slot is greater than the radial width of the layer at the circumferential end of the slot. The stator according to any one of claims 2 to 5, wherein, A slot opening opening in the radial direction is formed on the radially inner side of the slot, The stator further includes a wedge, the wedge is disposed in the slot, and is disposed between the opening of the slot and the coil wire, The alignment portion is in contact with the wedge. The stator according to any one of claims 1 to 6, wherein, The slit has a convex shape protruding radially outward at a radially outer end by first and second faces extending in the axial direction. The stator as claimed in claim 7, wherein, An angle between the first surface and the second surface is not less than 110 degrees and not more than 150 degrees. The stator according to any one of claims 1 to 8, wherein, The stator also includes insulating paper disposed in the slot, The slot also has a first connection portion connecting the radially outer end surface and the side surface, The first connecting portion is in a rounded shape with the sum of the radius of the coil wire and the thickness of the insulating paper as the radius of curvature. The stator according to any one of claims 1 to 9, wherein the stator further includes insulating paper disposed on the slot, and a slot opening in the radial direction is formed on the radially inner side of the slot opening , the slot also has a second connecting portion connecting the opening of the slot and the side surface, and the second connecting portion has a shape in which the sum of the radius of the coil wire and the thickness of the insulating paper is Rounded corner shape with radius of curvature. The stator according to any one of claims 1 to 8, wherein The stator core is integral, The coil wire is distributedly wound. A method of manufacturing a stator, The stator includes a stator core having a plurality of slots penetrating in the axial direction, The manufacturing method of the stator includes: A process of winding a coil wire having a circular cross-sectional shape into a loop to form a coil; and the step of inserting the coil into the slot, The side surfaces of both ends of the slot in the circumferential direction are planes having a constant circumferential width from the radially inner end to the radially outer end and extending in the axial direction.

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