JP5262868B2 - Stator manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a stator for, for example, a rotating electrical machine, and more particularly to a method for manufacturing a stator in which rectangular wires having a rectangular cross section constituting a coil winding (magnet wire) are arranged on a stator core by distributed winding. .

  In general, rotating electrical machines such as induction motors and direct current motors (including generators) are widely used as power sources for industrial or vehicle use, and distributed winding with high specific output is often used for the layout of the stator coils. ing. Recently, as a motor used in a hybrid drive vehicle and an electric vehicle, it has been proposed to use a rectangular wire having a high slot space factor as a magnet wire because of output / size requirements and the like.

  When a stator is formed by arranging a coil in the stator core, a part of the coil is arranged in a slot formed in a radial direction at a plurality of locations in the circumferential direction of the stator core. In the case where concentrated winding is used as a coil layout, a method is conventionally known in which a coil is formed in accordance with the shape of a slot arranged in advance, and the coil is twisted and inserted into each slot. The reason why the coils are inserted into the slots while twisting in this way is that each slot of the stator core is formed in the radial direction, so that the radial inner portion and the outer portion of each slot have a circumferential direction. This is because the intervals are different (see Patent Document 1).

JP-A-10-271733

  The invention described in Patent Document 1 described above is a method of arranging concentrated winding coils on a stator core, and is difficult to apply to distributed winding coils. That is, the distributed winding coil includes a plurality of linear portions and a metal wire having a plurality of continuous portions that alternately and continuously connect one end portion and the other end portion of each adjacent linear portion. A plurality of linear portions are arranged in each slot to constitute a stator. On the other hand, the concentrated winding coil has only a straight portion arranged in two slots, and is greatly different from the distributed winding in which each straight portion is arranged in a plurality of slots. Therefore, it is not easy to apply the concentrated winding coil arrangement method having different configurations to the distributed winding coil.

  In particular, when the metal wire constituting the coil is a rectangular wire having a rectangular cross section, the rectangular wire has directionality when inserted into the slot, and therefore, it is difficult to arrange the stator wire on the stator core as compared with a circular wire having a circular cross section. . That is, it is necessary to insert the rectangular wire into the slot while keeping the side surface of the rectangular wire parallel to the inner surface of the slot. For this reason, when arranging a rectangular wire in a slot by distributed winding, it is necessary to consider the directionality of a rectangular wire, and arrangement work becomes difficult. On the other hand, in the case of a round line, since there is no directionality and it is possible to arrange it in the slot while being freely deformed, the arrangement work is not as difficult as a rectangular line.

  Therefore, an object of the present invention is to provide a method for manufacturing a stator in which rectangular wires constituting a coil are arranged on a stator core by distributed winding.

The present invention comprises a stator core (2) having a plurality of slots (5) formed in a radial direction so as to open to a substantially cylindrical inner peripheral surface, and a winding of a coil (4). And a plurality of straight portions (12a, 12b) parallel to the slots (5) arranged in the slots (5) and one end portions of the adjacent straight portions (12a, 12b) A rectangular wire (W) having a rectangular section having a plurality of continuous portions (13a, 13b) that alternately and alternately connect the other end portions, and the rectangular wire (W) is distributed around the stator core (2) by distributed winding. In the manufacturing method of the stator formed,
The continuous portions (13a, 13b) are opposed to the side surfaces in a state where the linear portions (12a, 12b) are disposed in the slots (5), and the side surfaces of the linear portions (12a, 12b). While maintaining the parallelism with the inner surface of each slot (5), it is inclined so that the distance between the linear portions (12a, 12b) is smaller than the state of being arranged in each slot (5),
The straight portions (12a, 12b) are inserted into the slots (5) from the radially inner side to the outer side, and the inclination of the continuous portions (13a, 13b) is transferred to the stator core (2). The distance between the straight portions (12a, 12b) is increased by changing the arrangement so that the straight portions (12a, 12b) are arranged in the slots (5). It is characterized by doing.

  The inclination of each continuous part (13a, 13b) is changed by changing the bending angle of the bending part (14) between each continuous part (13a, 13b) and each linear part (12a, 12b). .

  By bending the continuous portions (13a, 13b) so as to follow the circumferential direction of the stator core (2), the rectangular wires (W) are formed in a state where the continuous portions (13a, 13b) are inclined. Arrangement work in the stator core (2) is started in a state in which the spiral rectangular wire (W) is arranged on one end side in the axial direction of the stator core (2).

  When the straight portions (12a) having an obtuse angle with the respective continuous portions (13a, 13b) in an inclined state are inserted into the respective slots (5), the continuous portions (13a) on one end side are inserted. Is arranged on one end side in the axial direction of the stator core (2), and a straight portion (12b) having an obtuse angle with each of the continuous portions (13a, 13b) in an inclined state is provided in each slot (5). When inserting each, the spiral rectangular wire (W) is sequentially moved so that the continuous portion (13b) on the other end side is disposed on the other axial end side of the stator core (2), Each straight portion (12a, 12b) is inserted into each slot (5).

  By inclining the linear part (12a, 12b) on one side with respect to the axial direction of the stator core (2), the continuous part (13a, 13b) on the one end side or the other end side becomes the inner diameter side of the stator core (2). The continuous portions (13a, 13b) are moved to one end side or the other end side in the axial direction of the stator core (2) through the inner diameter side of the stator core (2), and the straight portions (12a, 12b) By setting the inclination parallel to the axial direction, the straight portions (12a, 12b) and the continuous portions (13a, 13b) are arranged at predetermined positions.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it has no influence on the structure of each claim by this.

  According to the first aspect of the present invention, even a distributed winding coil formed by a rectangular wire can be disposed in each slot of the stator core. That is, by inclining each continuous portion of the rectangular wire constituting the coil, the distance between the straight portions is maintained while keeping the side surface of each straight portion parallel to the inner surface of each slot. Can be matched to the inner diameter side interval. Further, by inserting the straight portions into the slots while changing the inclination of the continuous portions so as to be arranged in the stator core, the intervals between the slots are directed radially outward. Even if the length is increased, the interval between the straight portions can be increased accordingly, and the side surfaces of the straight portions can be kept parallel to the inner side surfaces of the slots. Therefore, the straight portions can be inserted into the slots while keeping the straight portions parallel to each other, and distributed winding coils formed by rectangular wires can be easily arranged on the stator core. Further, since the straight portion can be inserted without difficulty while keeping parallel to the slots, the rectangular wire can be prevented from being damaged at the time of insertion, and the insulating enamel layer is not damaged.

  According to the second aspect of the present invention, it is not necessary to separately form a bent portion or the like in the flat wire in order to change the inclination of each continuous portion. That is, the part that deforms the flat wire for insertion into each slot is the same as the part that deforms to form the coil. For this reason, it is easy to maintain the shape of the coil after insertion. On the other hand, when a separate bent portion is formed, the bent portion may remain deformed even after insertion of the coil, making it difficult to maintain the shape of the coil.

  According to the third aspect of the present invention, since the rectangular wire is formed in a spiral shape and the spiral rectangular wire is disposed on one end side of the stator core, a space on the inner diameter side of the stator core can be secured, and the rectangular wire is placed in each slot. It is easy to perform the work of arranging the straight portions.

  According to the fourth aspect of the present invention, it is possible to efficiently arrange the straight portions in the slots.

  According to the fifth aspect of the present invention, it is possible to effectively utilize the inner diameter side of the stator core secured by making the rectangular wire into a spiral shape, and to efficiently arrange each continuous portion and each linear portion at a predetermined position. Can do well.

The perspective view which shows the stator manufactured by this invention. The perspective view which shows the coil (U phase). The front view, perspective view, and top view which have arrange | positioned one flat wire by distributed winding in the stator core by the manufacturing method which concerns on embodiment of this invention. The front view which shows the state which has arrange | positioned one flat wire spirally at the one end side of a stator core, the perspective view seen from the front direction, the perspective view seen from the plane direction. The front view, the perspective view seen from the front direction, and the perspective view seen from the plane direction which show the state seen from the angle different from FIG. 4 similarly. Similarly development schematic diagram. The front view, perspective view, and top view which show the 1st process which arrange | positions a flat wire in a stator core by the manufacturing method concerning embodiment of this invention, abbreviate | omitting a part of a flat wire. The front view, perspective view, and top view which show a 2nd process similarly. The front view, perspective view, and top view which show a 3rd process similarly. The front view, perspective view, and top view which show a 4th process similarly. The front view, perspective view, and top view which show the state which added the part which should be arrange | positioned next to the 1st process of FIG. The front view, perspective view, and top view which show the state which further added the part which should be arrange | positioned next to the 4th process of FIG. The front view, perspective view, and top view which show the 5th process which arrange | positions a flat wire to a stator core. The front view, perspective view, and top view which similarly show a 6th process. The front view, perspective view, and top view showing the 7th process similarly. The front view, perspective view, and top view which show the 8th process similarly.

  Embodiments of the present invention will be described with reference to the drawings. First, an example of a stator of a rotating electrical machine (motor, generator, etc.) to be manufactured according to the present invention will be described with reference to FIGS. The stator 1 constitutes an electric motor (including a generator) together with a rotor, and the electric motor is suitable for application to an electric motor (including a generator) serving as a drive source for electric vehicles and hybrid vehicles, particularly a brushless DC motor. is there. As shown in FIG. 1, the stator 1 includes a stator core 2 in which a large number of thin silicon steel plates are laminated, and a coil 4 around which a magnet wire (conductor, winding) 3 that is a predetermined material is wound. The stator core 2 is formed in a ring shape, and a plurality of slots 5 and teeth 6 that are open on the inner diameter side are alternately formed. The three-phase U, V, W coils 4 (4U, 4V, 4W) are wound between the two slots 5 separated by a predetermined pitch by distributed winding.

  The magnet wire 3 is a rectangular wire having a rectangular cross section, and an insulating coating such as an insulating resin is formed on the entire circumference of a conductor portion made of copper or the like. The three-phase coils 4U, 4V, 4W made of the wires 3 are arranged in the same-phase slot 5 in which a plurality of (for example, four) wires 3 having the same phase are arranged side by side in the radial direction of the stator core 2. In addition, in the one end side coil end portion 8 protruding from the one end surface 7 in the axial direction L of the stator core 2, a plurality of wires 3 having the same phase are arranged side by side in the radial direction (or axial direction) of the stator core 2. In the other end side coil end portion 10 protruding from the other end surface 9 in the axial direction L, a plurality of wires 3 having the same phase are bent toward the radially inner diameter side of the stator core 2 and arranged side by side in the radial direction of the stator core 2. Yes.

  As a representative example, the U-phase coil 4U is adjacent to the coil 4U in such a way that two sets 4U1 and 4U2 are set so as to occupy two adjacent slots 5 and 5, as shown in FIG. The two slots 5 and 5 are configured so that the closer and far sides of the two slots 5 and 5 are connected at a predetermined interval and the two sets are connected alternately. Each set of coils 4U1 and 4U2 projects in the circumferential direction M so as to connect the slot conductor portion 11 disposed in the slot 5 and the slot conductor portion 11 protruding from one end surface 7 of the stator core 2 and spaced apart from each other. One end side coil end portion 8 extending from the other end face 9 of the stator core 2 and the other end side coil end extending in the circumferential direction M by bending in the inner diameter direction R1 so as to be connected to the slot conductor portion 11 separated by a predetermined distance. Part 10. Both coil end portions 8 and 10 are bent in a plurality of circumferential directions (for example, Y) or axial directions (for example, X) so that they are arranged without interfering with each other in the axial direction L or the radial direction R ( It is bent).

  As described above, the coil 4 is formed by complicatedly bending the end portion. However, in the stator manufacturing method of the present invention described below, a coil having a simple shape without such a complicated bent portion is formed. A method of incorporating in the stator will be described. That is, FIG. 3 shows a state in which a part of the coil 4 is disposed in a predetermined slot 5 of the stator core 2 in a distributed winding in the stator core 2. As shown in FIGS. 1 and 2, it is not bent in a complicated manner. In addition, after incorporating the coil into the stator core, the end of the coil is bent into a predetermined shape or formed to some extent (for example, the bent portion is S-shaped). By using this method, the structure shown in FIGS. 1 and 2 can be obtained.

  First, as shown in FIG. 3, the stator core 2 has a substantially cylindrical shape as a whole, and has a plurality of slots 5 formed in the radial direction so as to open in the cylindrical inner peripheral surface at a plurality of locations in the circumferential direction. . The coil 4 disposed in the stator core 2 is formed of a rectangular wire having a rectangular cross section, and a plurality of linear portions 12a, 12b parallel to the slots 5 disposed in the slots 5, and It has the some continuous part 13a, 13b which makes one end part and the other end part of each adjacent linear part 12a, 12b continue alternately. And the coil 4 of such a shape is arrange | positioned by the said stator core 2 by distributed winding.

  The linear portions 12a and 12b correspond to the slot conductor portion 11 described above, and the continuous portions 13a and 13b correspond to the coil end portions 8 and 10 described above. Further, in the state of being arranged on the stator core 2, the continuous portion on one axial end {upper side in Fig. 3 (A)} is 13a, and the continuous portion on the other axial end {lower side in Fig. 3 (A)} is 13b. And the linear portion on one side in the circumferential direction of the continuous portion 13a at one end {counterclockwise in FIGS. 3B and 3C} is 12a, and the other side in the circumferential direction {FIG. 3B, (C ) In the clockwise direction} is 12b.

  In order to arrange the coil 4 on the stator core 2 in a distributed winding, as shown in FIGS. 4 to 6, a rectangular wire W constituting the coil 4 is formed in a spiral shape, and one end side in the axial direction of the stator core 2 {FIG. 4 (A), FIG. 5 (A), and the upper side of FIG. In order to make the rectangular wire W spiral, the continuous portions 13a and 13b are curved so as to follow the circumferential direction of the stator core 2 and arranged in the stator core 2 (state shown in FIG. 3). It is inclined with respect to. That is, each continuous part 13a, 13b is inclined with respect to a plane orthogonal to the straight line parts 12a, 12b existing at the respective ends, and as a whole {in FIG. 4 (A), FIG. 5 (A), FIG. 6 vertical direction} The shape is a spiral.

  Moreover, in order to incline each said continuous part 13a, 13b, the bending angle of the bending part 14 between each said continuous part 13a, 13b and each said linear part 12a, 12b is changed. That is, in the spiral state shown in FIGS. 4 and 5, the bending angle is obtuse in the bending portion 14 on one side in the circumferential direction of each continuous portion 13a and on the other side in the circumferential direction (on the straight portion 12a side) of each continuous portion 13b. In addition, in the bent portion 14 on the other circumferential side of each continuous portion 13a and on the one circumferential side (the straight portion 12b side) of each continuous portion 13b, the bending angle is an acute angle, and the continuous portions 13a and 13b are described above. It is inclined in the direction.

  In the state where the rectangular wire W thus formed in a spiral shape is arranged on one end side in the axial direction of the stator core 2, the arrangement work into the stator core 2 is started. This arrangement work will be described with reference to FIGS. First, as shown in FIG. 7, the interval between the linear portions 12a and 12b continuous by the continuous portion 13a is reduced by inclining the continuous portion 13a as described above. Then, as shown in the figure, this portion is arranged on the inner diameter side of the stator core 2. In the state of FIG. 7, the interval between the straight portions 12a and 12b is the same as the interval in the circumferential direction of the opening on the inner peripheral surface of the slot 5 to be arranged. In this state, the side surfaces of the straight portions 12a and 12b are parallel to the inner surfaces of the slots 5 facing the side surfaces in a state in which the straight portions 12a and 12b are disposed in the slots 5. Keep it.

  Next, as shown in FIG. 8, the straight portions 12a and 12b are inserted into the slots 5 from the radially inner side to the outer side. At this time, as shown in FIG. 8 → FIG. 9 → FIG. 10, the straight portions 12a and 12b are pushed into the back of the slots 5 while being parallel to the slots 5, while the continuous portions 13a The inclination is changed so that the angle formed by the continuous portion 13a and each of the linear portions 12a and 12b is 90 °, that is, the arrangement state on the stator core 2 is continued by the continuous portion 13a. The interval between the straight portions 12a and 12b is increased. As a result, the straight portions 12 a and 12 b are arranged in the slots 5. The same applies to the continuous portion 13b.

  In a state where the straight portions 12a and 12b are arranged at the back (outer diameter side) of the slots 5, the inclination of the continuous portion 13a changes (almost parallel to a plane orthogonal to the straight portions 12a and 12b). The straight portions 12a and 12b have intervals corresponding to the intervals on the back side of the slots 5. Therefore, the interval between the straight portions 12a and 12b is inadvertently reduced, and the straight portions 12a and 12b are moved inward in the radial direction of the slots 5 and do not fall out of the slots 5.

  7 to 10 show only the portions where the straight portions 12a and 12b are arranged at both ends of one continuous portion 13a of the flat wire W, but in actuality, FIG. 3 to FIG. As shown in FIG. 6, the flat wire W has a plurality of continuous portions 13a, 13b and straight portions 12a, 12b. Further, as described above, each of the continuous portions 13a, 13b has the one end portions and the other end portions of the respective linear portions 12a, 12b alternately arranged, and is arranged on the stator core 2 as shown in FIG. In this state, the continuous portions 13a and 13b are alternately arranged on one end side and the other end side of the stator core 2 in the axial direction. Therefore, when the straight portions 12a and 12b are sequentially arranged in the slots 5, it is necessary to appropriately move the continuous portions 13a and 13b.

  In the case of the present embodiment, the linear portions 12a and 12b are inserted into the slots 5 while moving the continuous portions 13a and 13b as follows. That is, as shown in FIG. 11, the one side of the continuous part 13a which makes one end part of each said linear part 12a, 12b become an obtuse angle that the angle made with each said continuous part 13a, 13b in the inclined state becomes an obtuse angle ( When the straight portion 12a on the left side in FIG. 11 is inserted into the slot 5, the continuous portion 13a on one end side is disposed on one end side in the axial direction of the stator core 2 (upper side in FIG. 11A). On the other hand, as shown in FIG. 12, the one side of the continuous part 13b which makes the other end part of each said linear part 12a, 12b become an acute angle, and the angle which each said continuous part 13a, 13b in the inclined state makes becomes an acute angle When the straight portion 12b (left side in FIG. 12) is inserted into the slot 5, the continuous portion 13b on the other end side is placed on the other axial end side of the stator core 2 {lower side in FIG. 12A). Deploy.

  In this way, one end of the continuous portions 13a and 13b is moved to move the continuous portion 13a on one end side to one end side in the axial direction of the stator core 2 and the continuous portion 13b on the other end side to the other end side in the axial direction of the stator core 2, respectively. The continuous portions 13a and 13b are positioned on the inner diameter side of the stator core 2 by inclining the straight portions 12a and 12b with respect to the axial direction. Even when the straight portions 12a and 12b are inclined as described above, the side surfaces of the straight portions 12a and 12b are parallel to the inner surface of the slot 5 facing the side surfaces. Then, the continuous portions 13 a and 13 b are moved to one end side or the other end side in the axial direction of the stator core 2 through the inner diameter side of the stator core 2. Next, the straight portions 12a and 12b and the continuous portions 13a and 13b are arranged at predetermined positions by setting the inclination of the straight portions 12a and 12b on one side parallel to the axial direction.

  That is, when the continuous portion 13b on the other end side is positioned on the inner diameter side of the stator core 2, as shown in FIGS. 12 and 13, the linear portion 12b on one side of the continuous portion 13b is directed toward the other end side in the axial direction. Incline inward in the radial direction. Then, the other end side continuous portion 13b is moved to the other end side in the axial direction through the inner diameter side of the stator core 2, and the linear portion 12b is inserted into the predetermined slot 5 from the inner side in the radial direction. Next, as shown in FIG. 14, the linear portion 12 b is arranged in a predetermined slot 5 by changing the inclination of the linear portion 12 b on one side.

  Further, when the continuous portion 13a on one end side is positioned on the inner diameter side of the stator core 2, as shown in FIGS. 14 and 15, the linear portion 12a on one side of the continuous portion 13a has a diameter toward the one end side in the axial direction. Tilt inward direction. Then, the continuous portion 13a on one end side is moved to one end side in the axial direction through the inner diameter side of the stator core 2, and the straight portion 12a is inserted into the predetermined slot 5 from the inner side in the radial direction. In this state, the other end side continuous portion 13b described with reference to FIGS. 11 to 14 is disposed at a predetermined position. Next, as shown in FIG. 16, the linear portion 12 a is arranged in a predetermined slot 5 by changing the inclination of the linear portion 12 a on one side. Furthermore, by arranging the straight portion 12b on the other side of the continuous portion 13a in a predetermined slot 5, the continuous portion 13a is also disposed at a predetermined position.

  In the case of the present embodiment, the continuous portions 13a and 13b are moved using the inner diameter side of the stator core 2 in this way. Since the rectangular wire W is formed in a spiral shape as described above and is disposed on one end side in the axial direction of the stator core 2, the inner diameter side of the stator core 2 can be effectively utilized in this way. Further, if the space on the inner diameter side of the stator core 2 is used, the operation of arranging the straight portions 12a and 12b in the slots 5 is facilitated.

  The movement of the continuous portions 13a and 13b and the operation of arranging the straight portions 12a and 12b in the slot 5 as described above are shown in FIGS. 11 → 12 → 13 → 14 → 15 → FIG. 16 → FIG. Repeat as shown in. Then, when such a work is repeated and the stator core 2 makes one turn, the state shown in FIG. 3 is obtained. 11 to 16 show only the straight portions 12a and 12b and the continuous portions 13a and 13b of the portion disposed in the stator core 2, and the subsequent straight portions 12a and 12b and the continuous portions 13a and 13b are omitted. Yes. Therefore, as the process proceeds, the numbers of the straight portions 12a and 12b and the continuous portions 13a and 13b are sequentially increased.

  From this state, by further arranging the rectangular wires W sequentially, the stator 1 as shown in FIG. 1 is obtained. As described above, in the above description, a complicated bent portion is not formed at the end of the coil 4. For example, after the coil 4 is arranged on the stator core 2 as described above, the end is radially inward. The stator 1 as schematically shown in FIG. 1 is obtained by bending in the direction.

  By arranging the rectangular wire W constituting the coil 4 as described above, even the distributed winding coil 4 formed by the rectangular wire W can be arranged in each slot 5 of the stator core 2. That is, by inclining each continuous portion 13a, 13b of the rectangular wire W with respect to a plane orthogonal to each straight portion 12a, 12b, the side surface of each straight portion 12a, 12b and the inner surface of each slot 5 are parallel. The distance between the straight portions 12a and 12b can be adjusted to the distance on the inner diameter side of the distance between the slots 5 while maintaining the above. On the other hand, by inserting the straight portions 12a and 12b into the slots 5 while changing the inclination of the continuous portions 13a and 13b so as to be in the state of being arranged on the stator core 2, 5, the distance between the straight portions 12 a and 12 b can be increased accordingly, and the side surfaces of the straight portions 12 a and 12 b and the slots 5 can be increased. Parallelism with the inner surface can also be maintained.

  Therefore, the straight portions 12a and 12b can be inserted into the slots 5 while keeping the parallel portions. That is, while keeping the side surfaces of the straight portions 12a and 12b parallel to the inner surfaces of the slots 5 facing the side surfaces with the straight portions 12a and 12b disposed in the slots 5, The interval between the straight portions 12a and 12b can be changed in accordance with the radial change in the interval between the slots 5 to be arranged. For this reason, the arrangement | positioning by the distributed winding to the stator core 2 of this rectangular wire W can be performed easily, ensuring the directivity of the rectangular wire W. FIG.

  In addition, in order to make the space | interval of each linear part 12a, 12b small, it is possible to enlarge the curvature of each continuous part 13a, 13b, but in this case, the side surface of each said linear part 12a, 12b and each slot 5 are considered. It is impossible to keep parallel with the inner surface. That is, when the curvature of each of the continuous portions 13a and 13b is changed, the direction of the side surface of each of the linear portions 12a and 12b also changes, so that the side surface cannot be made parallel to the inner side surface of each slot 5.

  Further, since the straight portions 12a and 12b can be inserted into the slots 5 without difficulty while keeping the straight portions 12a and 12b parallel to the slots 5, the rectangular wire W can be prevented from being damaged during the insertion. Does not damage the enamel layer for insulation. As a result, a good stator can be obtained.

  Further, in the case of the present embodiment, it is not necessary to separately form a bent portion or the like in the flat wire W in order to change the inclination of each continuous portion 13a, 13b. That is, the portion where the flat wire W is deformed to be inserted into each slot 5 is the same as the portion where the coil 4 is formed. In other words, both are the bent portions 14. For this reason, it is easy to maintain the shape of the coil 4 after insertion. On the other hand, when a separate bent portion is formed, the bent portion may remain deformed even after the coil 4 is inserted, and it becomes difficult to maintain the shape of the coil 4.

  Further, in the case of the present embodiment, since the rectangular wire W is formed in a spiral shape and the spiral rectangular wire W is arranged on one end side of the stator core 2, a space on the inner diameter side of the stator core 2 can be secured, and each slot 5 It is easy to perform the operation of arranging the straight portions 12a, 12b of the flat wire W. Further, as described above, the inner diameter side of the stator core 2 secured by making the rectangular wire W spiral is used effectively, and the continuous portions 13a and 13b are connected to one end side and the other end side of the stator core 2, respectively. The linear portions 12a and 12b can be arranged in the slots 5 efficiently.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 3 Magnet wire 4 Coil 5 Slot 6 Teeth 7 One end surface 8 One end side coil end part 9 Other end surface 10 The other end side coil end part 11 Slot conductor part 12a, 12b Linear part 13a, 13b Continuous part 14 Bending part W Flat wire

Claims (5)

A stator core having a plurality of slots formed in a radial direction so as to open to a substantially cylindrical inner peripheral surface at a plurality of positions in the circumferential direction, and windings of the coil, each of which is arranged in each of the slots A rectangular wire having a rectangular cross section having a plurality of straight portions parallel to the slot and a plurality of continuous portions in which one end portion and the other end portion of each adjacent straight portion are alternately continued. In a stator manufacturing method in which the stator core is arranged in distributed winding,
In each slot, the continuous portion is kept parallel to the side surface of each linear portion and the inner surface of each slot facing the side surface in a state where the linear portions are disposed in the slots. Inclined so that the interval between the linear portions is smaller than the state of being arranged in,
While inserting the straight portions into the slots from the radially inner side to the outer side, changing the inclination of the continuous portions so as to be in the arrangement state on the stator core, the straight portions are A method of manufacturing a stator, wherein the linear portions are arranged in the slots by increasing the interval of the stator.   The method of manufacturing a stator according to claim 1, wherein the inclination of each continuous portion is changed by changing a bending angle of a bending portion between each continuous portion and each linear portion.   By curving each continuous portion so as to follow the circumferential direction of the stator core, the rectangular wire is spiraled in a state where each continuous portion is inclined, and the spiral rectangular wire is formed in the axial direction of the stator core. The method for manufacturing a stator according to claim 1 or 2, wherein an arrangement work in the stator core is started in a state of being arranged on one end side.   When inserting each straight portion with an obtuse angle with each continuous portion in an inclined state into each slot, the continuous portion on one end side is disposed on one axial end side of the stator core and is inclined. When inserting the straight portions with the acute angles formed with the respective continuous portions into the respective slots, the other end side continuous portions are arranged on the other axial end side of the stator core, The stator manufacturing method according to claim 3, wherein the spiral rectangular wires are sequentially moved, and the straight portions are inserted into the slots.   By inclining the linear portion on one side with respect to the axial direction of the stator core, the continuous portion on the one end side or the other end side is positioned on the inner diameter side of the stator core, and the continuous portion passes through the inner diameter side of the stator core. 5. The linear portion and the continuous portion are arranged at predetermined positions by moving the stator core to one end side or the other end side in the axial direction so that the inclination of the straight portion is parallel to the axial direction. The stator manufacturing method as described.

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