JP2008278681A - Stator, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator in which split stators each having a yoke, a flange, a tooth coupling the yoke to the flange and a solenoid portion formed by winding an electric wire in a multilayer around the tooth are annularly arranged, wherein a step difference or a dead space formed on the outermost layer of the solenoid portion is small, resulting in a high space factor, and a fault displacement and a stress concentration portion are small, and to provide a manufacturing method thereof. <P>SOLUTION: In the stator, the solenoid portion comprises an inner layer portion consisting of an electric wire wound around the tooth and having its thickness constant between the yoke and the flange, and an outer layer portion consisting of an electric wire wound around the inner layer portion and having its thickness thicker in the yoke side and thinner in the flange side. The electric wire consisting the inner layer portion has a polygonal cross section having a predetermined size and shape, and the electric wire consisting the outer layer portion has a rectangular cross section having aspect ratios different in positions where the electric wire is wound. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator used in a rotating electrical machine such as a motor, and more specifically to a stator in which divided stators are arranged in an annular shape. The present invention further relates to a method for manufacturing the stator.

  In order to increase the output and efficiency of the rotating electric machine (motor, generator) without increasing the size, a yoke, a collar, teeth for coupling the yoke and the collar, and a collar and the yoke are used as the stator. A portion formed by winding the wires around the teeth in multiple layers, that is, a divided stator having a solenoid portion, arranged in an annular shape with the yoke on the outer peripheral side and the teeth in the radial direction. It is used. As a result, an increase in the magnetic flux density and an easy winding of the electric wire around the teeth are achieved.

1 and 2 are views conceptually showing a stator having this structure.
1 and 2, 10 is a core, 11 is a yoke, 12 is a tooth, 13 is a collar, 14 is an insulator, 20 is a solenoid part, 21 is an electric wire, Reference numeral 29 denotes a boundary line on the outer peripheral side of the solenoid unit 20 (indicated by a dotted line because it is not an object).

  FIG. 1A conceptually shows a state in which the divided stators of the stator are arranged in an annular shape around the center O of the stator, and FIG. 1B shows one of the divided stators ( 1 shows a structure of the core 10 in FIG. 1A, that is, a structure composed of a yoke 11, a tooth 12, and a collar 13. The teeth 12 are prismatic and connect the yoke 11 and the collar 13 and extend in the radial direction of the ring shown in FIG. In FIG. 1A, in order to make the illustration easy to understand, the stator itself having an annular cross section is shown by a dotted line, the solenoid portion 20 and the insulator 14 of the divided stator A are shown by shading, and all the divided stators and Drawing of individual electric wires is omitted.

  FIG. 2 is a diagram showing in detail one of the left and right sides separated by C-C in the portion A of FIG. 1A, and covers the teeth 12 (directly covers the teeth 12). A state is schematically shown in which the electric wire 21 is aligned and wound on the insulator 14), and the solenoid portion 20 is formed in the space formed by the yoke 11, the teeth 12 and the collar 13. As shown in FIG. 2, the solenoid unit 20 is a layer (hereinafter referred to as “solenoid layer”) composed of a row of electric wires (solenoids) arranged along the direction of teeth (the radial direction of the stator) as a result of the winding of the electric wires 21 in an aligned manner. Is sometimes laminated in multiple layers.

  Here, the term “aligned winding” refers to winding so that one wire on the outer layer enters one of the recesses between the two wires on the inner layer. In FIG. 2, each electric wire of the solenoid layer (the wire layer of arrow F) on one outer layer side of the solenoid layer (the wire layer of arrow E) formed by the wire 21 wound directly around the insulator 14 is Winding is performed so that one wire enters between two wires in the wire layer of the arrow E, and by repeating such winding, that is, aligned winding, prevention of collapse and dense winding are achieved. Yes. In FIG. 2, the electric wire 21 has an insulating coating layer (hereinafter referred to as “insulating coating”) around the conductor. However, in order to make the illustration easy to understand, both are shown separately. Absent.

  In order to increase the output and efficiency of the rotating electrical machine, it is desired to increase the number of wires wound around the teeth. Then, as one means for increasing the number without increasing the size of the rotating electrical machine, the cross-sectional area of the portion (slot) surrounded by the boundary line 29 of the yoke 11, the teeth 12, the collar 13, and the solenoid portion shown in FIG. It is desired to increase the ratio of the sum of the cross-sectional areas of the conductor portions of the wire that is wound on the wire, that is, to improve the space factor.

In order to improve the space factor, it is desired to wind the electric wires in close contact with each other when winding the electric wires to form the solenoid portion 20, and to fill a wider area in the slot with the electric wires. For example, Japanese Patent Application Laid-Open No. 9-191588 discloses an invention in which a cross-sectional shape of a slot is trapezoidal (rectangular) in order to fill a wider area in the slot with electric wires.
JP-A-9-191588

  In the stator as shown in FIG. 1A, each divided stator is provided in an annular shape, so that the yoke 11 is longer than the collar 13 as shown in FIG. For this reason, when the electric wire 21 is wound around the prismatic teeth 12 so as to be closely aligned with each other and to be wound in the maximum range that does not interfere with the adjacent divided stator (that is, the range not exceeding the boundary line 29), The electric wire in the outermost layer of the solenoid unit 20 has to be wound in a stepped shape. As a result, a step close to the diameter of the electric wire (a portion indicated by three thick arrows in FIG. 2) is generated, and the space factor is reduced by the amount of dead space formed by this step.

  As a method for improving the space factor, a method is conceivable in which after the electric wire is wound, the formed solenoid portion is compressed in the direction of the teeth to eliminate the gap between the electric wires and the dead space. However, this method pressurizes the stepped solenoid part due to the step, which causes fault displacement due to stress concentration (displacement between wires), and problems such as damage to the insulation coating due to friction between wires. Occurs. Furthermore, there are cases where the core is destroyed due to stress concentration or residual strain occurs, resulting in deterioration of magnetic properties.

  The present invention relates to a stator in which a yoke, a collar, a tooth for coupling between the yoke and the collar, and a split stator having a solenoid part formed by winding an electric wire around the tooth in multiple layers are arranged in an annular shape, and the solenoid part It is an object of the present invention to provide a stator characterized in that a step or a dead space generated in the outermost layer is small, resulting in a high space factor. The present invention further provides a method of manufacturing a stator having the above-described excellent features.

  The above problems are solved by the invention having the following configuration.

The present invention, as claim 1 thereof,
The divided stator is an annularly arranged stator,
The split stator has a yoke on the outer peripheral side, a collar on the inner peripheral side, a tooth for coupling between the yoke and the collar, and a solenoid part in a space between the yoke, the collar and the tooth,
The solenoid part is made of an electric wire wound on a tooth and has an inner layer part whose thickness is constant between the yoke and the collar, and an electric wire wound on the inner layer part, and the thickness is made of the yoke. The outer side is thick on the side and thin on the collar side,
The electric wire constituting the inner layer part has a polygonal cross section of a certain size, and
Provided is a stator in which an electric wire constituting an outer layer portion has a quadrangular cross section having a different aspect ratio depending on a winding position.

  The stator of the present invention is a stator in which divided stators are arranged in an annular shape. The split stator includes a yoke on the outer peripheral side of the annular ring, a collar on the inner peripheral side, which connects the yoke and the collar, that is, teeth extending in the radial direction of the annular ring, and between the yoke and the collar and the teeth, That is, they are in the space formed by them, and have a solenoid portion formed by winding wires in multiple layers around the teeth. About the divided stator, yoke, collar and teeth, and the point of forming a solenoid part by laminating a solenoid layer formed by winding an electric wire on the teeth is represented in FIG. 1, FIG. 2, etc. and described above. Since it is the same as that of the conventional stator, detailed description is omitted.

  The stator according to the present invention includes an inner layer portion that is a portion close to the teeth (that is, an inner portion) and an outer layer portion that is a portion close to the outer surface, and the inner layer portion and the outer layer portion have a cross section of a wire to be wound. The shape and the form of lamination are different from each other.

  An inner layer part consists of the electric wire wound on the teeth. The term “on the teeth” includes the meaning of “directly on the teeth”. However, when the teeth are covered with an insulator for ensuring insulation from the wound wire, On the insulator covering.

  The electric wire which comprises an inner layer part has a polygonal cross section, and the magnitude | size of the cross section is constant. As a result, the gap between the electric wires is reduced, contributing to an improvement in the space factor.

  Here, the polygonal shape means a polygon or a shape close to a polygon. A shape close to a polygon is formed by a combination of straight sides such as a polygon, but includes a shape including a curved portion at a corner or some of the sides.

  The constant cross-sectional size means that the cross-sectional area of the electric wire constituting the inner layer portion is substantially constant at most positions. Moreover, the cross-sectional shape of the electric wire constituting the inner layer portion may be substantially constant except for the upper portion (the portion that contacts the outer layer portion) and the lower portion (the portion that contacts the teeth or insulator) and the portion that contacts the yoke and the collar. Among them, a hexagon is preferable. By making the cross-sectional area substantially constant and having a substantially constant cross-sectional shape, the gap between the wires wound around the inner layer portion can be reduced, and the space factor can be improved. However, in the upper and lower parts of the inner layer part and the part in contact with the yoke and the collar, one side of the cross section of the electric wire is in contact with the insulator, outer layer part, etc., so in order to reduce the gap between them, the shape different from other parts Are preferable, and among them, a pentagon is preferable.

  Further, the thickness of the inner layer portion is constant between the yoke and the collar. Therefore, there is no dead space or step on the outer surface portion of the inner layer portion. Since the thickness of the inner layer portion is constant between the yoke and the collar, and the wire is made of a constant cross-sectional area, the number of laminated layers is constant over the entire area between the yoke and the collar.

  On the other hand, the outer layer portion is constituted by an electric wire having a square cross section, and the electric wire is wound tightly around the inner layer portion. Since the electric wires having a square cross section are wound closely to each other, the gap between the electric wires is very small.

  Since the outer layer portion corresponds to the shape of the portion (slot) surrounded by the boundary line between the yoke, the teeth, the collar and the solenoid portion, the outer layer is thicker on the yoke side and thinner on the collar side. In addition, the electric wire having a quadrangular cross section constituting the outer layer portion is characterized in that the aspect ratio of the quadrilateral differs depending on the position where it is wound. Therefore, the cross section of the outer layer portion is a combination of electric wire cross sections having different aspect ratios. Become.

  As described above, since the number of layers needs to be increased from the collar portion to the yoke portion when winding the electric wire around the split stator, the cross section has a round shape with a constant size and shape (a cross section is a circular line) or a flat angle. When the solenoid part is formed using only the wire, a step near the outer diameter of the wire (about 0.8 times in the case of a round wire) or dead at the place where the number of layers between the collar part and the yoke part changes. Space is created. However, as the electric wire constituting the outer layer part, an electric wire having a quadrangular cross section and a different aspect ratio depending on the winding position is used, and the winding position and the aspect ratio are reduced so that such a step or dead space is reduced. By adjusting the relationship, the step and the dead space can be made much smaller than the outer diameter of the electric wire, which can contribute to the improvement of the space factor.

  In particular, by adjusting the aspect ratio in the vicinity of the place where the number of laminations changes, the step can be made smaller. For example, the step is 0.5 times or less, preferably 0.3 times or less the outer diameter of the electric wire. You can also As will be described later, an electric wire having a square cross section can be obtained by rolling during winding of the electric wire. In this case, however, a rolling process is required and a burden required for manufacturing is large. Therefore, it is preferable that the outer layer portion be as small as possible (thin), and therefore, on the collar side, the number of wires in the outer layer portion is preferably about 0 to 1 layer.

The present invention provides, in addition to the above-described stator, a method for manufacturing the stator as claim 2 thereof.
That is, the method for manufacturing a stator of the present invention,
An aligned winding step of forming an electric wire layer by winding an electric wire having a constant cross section on the teeth;
The wire layer is compressed in the direction of the teeth to reduce or eliminate gaps between the wires, and after the compression step, the wire is further deformed into a quadrangle in cross section and the length and breadth thereof The outer layer forming step of winding while adjusting the ratio according to the position where it is wound,
It is a manufacturing method of the stator characterized by having.

  In this manufacturing method, an inner layer portion is first formed. This inner layer portion forming step includes an aligned winding step and a compression step.

  In the aligned winding process, electric wires having a constant cross section are aligned and wound on the teeth (in some cases, “directly on the insulator”). “The cross-section has a constant size” means that the cross-sectional area (thickness) of the electric wire is constant over the entire length of the electric wire forming the inner layer portion. As such an electric wire, it is preferable that the shape of the cross section is also constant over the whole length of the electric wire, and for example, a round wire having a constant diameter is used.

  An electric wire having a constant cross section is wound in multiple layers between the yoke and the collar. A plurality of layers of electric wires formed in this way are referred to as “electric wire layers” in the present invention. Since it is an aligned winding, it is wound so that adjacent electric wires are in contact with each other, and one outer layer electric wire is inserted into a recess between two inner electric wires. In the production of the stator of the present invention, the aligned winding is usually performed while rotating the core for forming the divided stator and supplying the electric wire from the electric wire supply unit.

  The number of wire layers (the number of solenoid layers stacked) is constant between the yoke and the collar. Since the cross-sectional size of each electric wire is constant, the thickness of the electric wire layer is constant between the yoke and the collar. Accordingly, there is no step or dead space on the outer surface.

  After the aligned winding process is completed, a compression process is performed in which the electric wire layer, that is, the multiple layers of the aligned electric wires, are compressed in the direction of the teeth. This compression can be performed by pressing in the direction of the central axis of winding from the outside of the electric wire layer using a flat punch or the like. If there is a step in the laminated electric wires, a gap between the electric wires is likely to occur at the step portion during compression, but the electric wire layer formed in the process of the present invention has no step, so it is uniform. Can be compressed, and there is no deviation between the wires. Furthermore, it acts to prevent the yoke and collar from slipping.

  By this compression, the gap between the wound wires is reduced or almost disappeared, and the space factor is improved. By this compression, the cross section of the electric wire becomes a polygonal shape having a constant size and shape, and an inner layer portion is formed.

  After the inner layer portion of the solenoid portion is formed in this way, an outer layer portion of the solenoid portion is formed by winding an electric wire having a square cross section on the outside. This winding is performed so that the thickness of the outer layer portion increases as it goes from the collar side to the yoke side, and the step in the outer surface of the solenoid portion after winding is reduced so that the step of the square of the wire section is reduced. This is done by adjusting the aspect ratio.

  A wire having a square cross section can be obtained by rolling the wire before winding the wire. As the rolling method, a method of pressing the periphery of the electric wire with a roller is preferably exemplified. Claim 3 corresponds to this preferable mode.

  According to this method, the aspect ratio of the electric wire can be adjusted by adjusting the pressing force of each roller. For example, two pairs of two rollers facing each other are arranged around the electric wire in the cross-sectional direction so as to be perpendicular to each other, and the electric wire is sandwiched and pressed by each pair to deform the electric wire cross-section into a quadrangle. At the same time, the aspect ratio can be adjusted by adjusting the pressing force of each pair. In actual winding, it is preferable to obtain the relationship between the position where the electric wire is wound and the aspect ratio by examining the drawings in advance, manufacturing a prototype, and performing a simple preliminary experiment.

  The pressing may be performed in a plurality of times. In addition to rolling, various treatments such as preheating, tension, and softening by heating after final deformation may be performed simultaneously or separately.

  The present invention is a stator in which a yoke, a collar, a tooth for coupling between the yoke and the collar, and a split stator having a solenoid part formed by winding an electric wire around the tooth in multiple layers are arranged in an annular shape. As a result, the stator can achieve a high space factor, and is suitably used for motors that require high output and high efficiency. In addition, according to the manufacturing method of the present invention, it is possible to manufacture a stator having this excellent characteristic without causing a fault shift or a stress concentration portion in the solenoid portion.

  Hereinafter, the best mode of the present invention will be described with reference to the drawings. The present invention is not limited to this best mode. Various modifications can be made to this embodiment within a range that does not impair the spirit of the invention.

  FIG. 3 is a diagram conceptually showing a main part (device for winding an electric wire around a divided stator) of the stator manufacturing apparatus of the present invention. In FIG. 3A, 10 is a core that is winding an electric wire, 12 is its teeth (cross section), and 20 is a solenoid part that is being formed by winding. 21 is a wire (round wire) to be wound. Reference numerals 30a and 30b denote electric wire rolling portions.

  Reference numeral 42 denotes a reverse warp roller. Reference numeral 50 denotes a control device, which includes a timer 51, a counter 52, and a memory 53, and 54 denotes a rotation and corner detector of the core 10. Reference numeral 60 denotes a wire supply roller.

  FIG. 3B shows a rolled portion 30 a or 30 b of the electric wire, and is a conceptual cross-sectional view cut along a plane perpendicular to the longitudinal direction (feed direction) of the electric wire 21. In FIG. 3B, 21 represents a cross section of the electric wire to be rolled, 31 is a rolling roller, and 39 is a driving cylinder for the rolling roller 31. (Note that 21 in FIG. 3 (b) represents a cross section of the electric wire in a state where the rolling is not operated, and therefore, a cross section of the round wire, but when the rolling is operated, the cross section of the electric wire 21 is deformed, After passing through the rolling parts 30a and 30b, it becomes a square.) The rolling parts 30a and 30b are arranged so that their directions are perpendicular to each other. That is, in the rolling section 30a, the two rolling rollers 31 and the driving cylinder 39 are arranged so as to be aligned on the paper surface, and in the rolling section 30b, the two rolling rollers 31 and the driving cylinder 39 are perpendicular to the paper surface. It is arranged to line up. By arrange | positioning in this way, the outer periphery of an electric wire can be rolled from the four directions.

  The core 10 is rotated counterclockwise by a motor (not shown), whereby the electric wire 21 is wound around the outer periphery of the tooth 12 having a substantially quadrangular cross section (however, the corners are rounded). The solenoid part 20 is formed.

  The electric wire 21 is sandwiched between two electric wire supply rollers 60 and sent. The rotation speed of the wire supply roller 60 is controlled so as to be adjusted with the rotation speed of the motor for rotating the core 10 and the number of layers of the already wound wire, Thereby, the electric wire 21 is supplied at a predetermined speed.

  The reverse warp roller 42 is provided to give the electric wire 21 a warp in a direction opposite to a direction in which the electric wire 21 is bent when being wound around the core 10. By passing the reverse warp roller 42, so-called winding thickening can be suppressed.

  The memory 53 of the control device 50 stores the outer diameter of the tooth 12, the diameter of the electric wire, the mechanical properties of the material of the electric wire, the number of layers around which the electric wire transformed into a predetermined quadrangle is wound, and its layers. The number of columns in the table and other data necessary for control are input in advance. Further, the rotation and corner detector 54 always receives necessary data, such as a pulse signal (PS) being input every time the corner of the tooth 12 passes. Based on these pieces of information, the control device 50 issues a control signal (C.S.) to control the drive cylinder 39, the wire supply roller 60, etc., and to control the predetermined deformation of the wire 21 and the like.

  FIG. 4 is a diagram conceptually showing a manufacturing process of a solenoid part which is an essential part of an example of the stator of the present invention, and is a view corresponding to FIG. 2 used for explaining the prior art (in the stator shown in FIG. 2). It is a diagram showing the same position as the position). FIG. 4 (a) shows the state immediately before the winding of the electric wire inside the solenoid portion (the portion serving as the inner layer portion) is completed and the tooth is pressed by the press in the direction of the teeth (the direction toward the central axis where the electric wire is wound). It is a conceptual sectional view showing a state of and a state of pressing.

  As shown in FIG. 4A, the electric wire 21 (round wire) is aligned and wound on the insulator 14 covering the teeth 12, and the electric wire layer is formed by laminating the aligned and wound layers. The electric wire layer is pressed by the press 90 in the direction of the teeth 12 (the direction of the arrow P). Further, the number of stacked layers is the same three layers from the yoke 11 to the collar 13, so that no step is generated. 4 that have the same function are denoted by the same reference numerals as in FIG. As the press 90, a flat punch or the like is used.

  FIG. 4B is a diagram conceptually showing a cross section in a state where the inner layer portion T is formed by pressing, and then the winding of the electric wire of the outer layer portion U is finished, and the divided stator of the stator of the present invention is completed. .

  In FIG. 4 (b), 22 is the electric wire of the inner layer portion T whose cross section has been deformed into a polygon by pressing after winding, and 23 is the position of the winding (layer or layer) by rolling before winding. It is an electric wire transformed into a quadrangle whose aspect ratio changes in accordance with the column), and constitutes the outer layer portion U. Reference numeral 29 denotes a boundary line on the outer peripheral side of the solenoid portion.

  Actually, the outer periphery of each of the electric wires 21, 22, and 23 is provided with an insulating coating (when the electric wire diameter is about 1 mm, the thickness is about 30 to 25 μm), but the illustration is omitted. Examples of the insulating coating material include polyamideimide and polyimide. FIG. 4 is a conceptual diagram for illustrating the features of the present invention. In an actual stator, the number of wire layers and the number of windings (turns) are usually much larger (the same applies to FIG. 2). ).

  Next, a process for manufacturing the stator of the present invention using the apparatus shown in FIG. 3 will be described.

  First, the electric wire 21 is wound while the core 10 is rotated to form a portion that becomes an inner layer portion of the solenoid portion. At this time, the rolling portions 30a and 30b of the electric wire 21 are not activated. For example, only one of the two rollers included in each of the rolling portions 30a and 30b is passed, and the other rollers are placed in a state where they do not contact the electric wire. For this reason, the electric wire 21 is wound around the core 10 with a round wire.

  FIG. 4A shows a state in which the winding of the electric wire forming the inner layer portion T of the solenoid portion has been completed. Thereafter, as shown in this figure, the electric wire 21 (round line) is pressed 90 from the outer peripheral side. Is pressed toward the teeth 12 to form the inner layer portion T. As a result of the pressing, as shown in FIG. 4B, the electric wire 22 in the inner portion is deformed so that the cross section thereof is a polygon and most of the electric wire 22 is substantially a hexagon. However, the lowermost layer electric wire, the uppermost layer electric wire, the yoke 11 and the brim 13 side electric wire, etc. have shapes other than this hexagon.

  After the formation of the inner layer portion T, the outer portion of the electric wire is wound. At this time, the rolling portions 30a and 30b operate according to the position (layer or row) where the electric wire 21 is wound. The cross section is deformed so as to be a quadrangle having an aspect ratio corresponding to the rotated position. The rolling method is performed by pressing the rolling roller 31 from around the electric wire. For this reason, the rolling roller 31 is moved in the direction indicated by the double arrow by the drive cylinder 39, whereby the electric wire 21 is pressed from the periphery by the rolling roller 31 and the cross section is deformed into a quadrangle having a predetermined aspect ratio. Is done.

  It is preferable that the degree of aspect ratio of the outer-layer electric wire to be deformed according to the winding position is determined by examining the drawings in advance and manufacturing a prototype. Then, the result is input to the memory 53 of the control device 50, and in actual winding, based on the signal from the detector 54, information from the memory 53, etc., the driving cylinder 39, the electric wire supply A predetermined deformation is performed on the electric wire 21 by controlling the roller 60 and the like.

  In addition, about the electric wire currently formed with electrolytic copper, pure copper, etc., many data, standards, such as JIS, already exist. When performing winding, new data may be required regarding the relationship between the pressing force applied to the wire and the degree of deformation, depending on the type of wire used for the wire and the degree of deformation. It is possible to refer to the data being used, and there is no particular difficulty in implementation. Depending on the degree of deformation and the treatment for it, the copper and pure copper that form the wire may be hardened and the electrical characteristics may deteriorate, but this can be cured by annealing (softening treatment) by means of electrical heating or the like. is there.

In a stator, it is a conceptual diagram which shows a mode that the division | segmentation stator is arrange | positioned, and its core. It is a conceptual sectional view showing a solenoid part and its circumference of a stator of a prior art. It is a conceptual diagram which shows the principal part of the manufacturing apparatus of the stator of this invention. It is a conceptual sectional view showing the manufacturing process of the solenoid part of the stator of the present invention.

Explanation of symbols

10 Core 11 York 12 Teeth 13 Brim 14 Insulator 20 Solenoid part 21 Electric wire (Round wire)
22 Electric wire (cross section deformed into a polygon)
23 Electric wire (Cross section is transformed into a square with different aspect ratio)
29 Solenoid boundary lines 30a and 30b Rolling section 31 Rolling roller 39 Driving cylinder 42 Reverse warping roller 50 Controller 51 Timer 52 Counter 53 Memory 54 Rotation and corner detector 60 Electric wire supply roller 90 Press T Inner layer section U outer layer

Claims (3)

The divided stator is an annularly arranged stator,
The split stator has a yoke on the outer peripheral side, a collar on the inner peripheral side, a tooth for coupling between the yoke and the collar, and a solenoid part in a space between the yoke, the collar and the tooth,
The solenoid part is made of an electric wire wound on a tooth and has an inner layer part whose thickness is constant between the yoke and the collar, and an electric wire wound on the inner layer part, and the thickness is made of the yoke. The outer side is thick on the side and thin on the collar side,
The electric wire constituting the inner layer portion has a polygonal cross section of a certain size and shape, and
A stator in which an electric wire constituting an outer layer portion has a quadrangular cross section having a different aspect ratio depending on a winding position. An aligned winding step of forming an electric wire layer by winding an electric wire having a constant cross section on the teeth;
The wire layer is compressed in the direction of the teeth to reduce or eliminate gaps between the wires, and after the compression step, the wire is further deformed into a quadrangle in cross section and the length and breadth thereof The outer layer forming step of winding while adjusting the ratio according to the position where it is wound,
The method of manufacturing a stator according to claim 1, comprising:   3. The method of manufacturing a stator according to claim 2, wherein the deformation of the cross section of the electric wire into a quadrangle and the adjustment of the aspect ratio are performed by pressing the outer periphery of the electric wire with a roller before winding.

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