JP4530493B2 - Manufacturing method of coil unit for rotating machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a coil unit for a rotating machine.
[0002]
[Prior art]
A rotating machine such as an electric motor or a generator includes a stator (stator) and a rotor (rotor), and the stator includes a core and a coil mounted therein. The core further includes a cylindrical core back and teeth members that are concentrically incorporated in the core back and have a large number of teeth extending radially on the outer peripheral surface thereof. Each of the teeth is wound with a coil in which a conductive wire is wound a predetermined number of times. Each coil is normally a unit (coil unit) in which an appropriate number of units are connected as a unit, and the unit is attached to the tooth or connected to an external power source.
[0003]
Conventionally, as a method for connecting the coils in the coil unit, there has been known a method in which the ends of the coils are further bent at right angles to the outside and the bent ends are sequentially connected by welding.
[0004]
[Problems to be solved by the invention]
However, with the latter method, it is extremely difficult to form the welded parts of the coil that is the connection partner so that they can be correctly aligned. Therefore, in such a case, there is a problem that an excessive force is applied to the welded part when the coil unit is to be attached to the teeth. In particular, such a problem becomes apparent when a conductive wire having a high rigidity and a large winding diameter is used.
[0005]
The present invention has been developed and devised in view of the above-described conventional problems, and an object thereof is to provide a method of manufacturing a coil unit that can be easily manufactured and that ensures connection between coils. It is.
[0006]
[Means for Solving the Problems]
The invention of claim 1 for achieving the above object is a method for manufacturing a coil unit that is incorporated in a stator of a rotating machine and is formed by connecting a plurality of coil portions by a single conducting wire. The coil portion is formed by winding the conductive wire from the root side to the tip side of one of a plurality of mandrel pairs provided at the tip of a winding jig rotatable around the axis so as to be displaceable in the axial direction. And then winding the next mandrel pair in the same direction as the coil part from the root side to the tip side of the next mandrel pair at a position shifted from the winding axis of the coil part. To form a coil unit having a plurality of coil units by repeating this operation a predetermined number of times, and a coil unit formed through such a coiling process is an adjacent coil. A plurality of coil portions are arranged in parallel with each other in the extending direction of the connecting pieces by connecting pieces drawn between the portions in a direction perpendicular to the winding axis of each coil portion. The coil unit is continuous in a step shape along the axial direction of the winding shaft of the coil portion, and the end of the coil unit on the winding start side and the end of the coil end side of the coil unit are drawn out in the same direction. After the coiling step, each coil portion is twisted by 180 ° using one side portion of the winding line of the winding stage continuous to the connecting piece as an inversion axis in each coil portion so that the coil portions are arranged in a plane. The twisting process for alternately changing the winding direction of each coil part is performed. It is characterized by this.
According to a second aspect of the present invention, in the first aspect of the present invention, the winding plate that forms each coil portion by winding the conductive wire is widened when the conductive wire is wound, and the conductive wire is wound around the outer peripheral surface. However, when the coil portion is extracted after being formed, the width is narrowed and the coil portion is displaced so as to be separated from the inner periphery.
[0007]
[Action and effect of the invention]
According to the first aspect of the present invention, at the stage where the coiling process is completed, a plurality of coil portions having the same winding direction and a continuous shape in the height direction are obtained. In the twisting process, 180 ° twisting is applied to this with the connection portion of each coil portion as the center, and as a result, a coil unit in which the coil portions are arranged substantially in a plane is obtained. Further, as a result of the 180 ° inversion, the winding directions of adjacent coil portions are opposite to each other.
According to the second aspect of the present invention, the winding plate is kept in a widened state when winding the conductive wire, and a corresponding coil portion is formed by winding the winding plate around the outer peripheral surface. When the coiling is completed and the coil plate is extracted, the coil plate can be easily extracted because the coil plate can be separated from the inner peripheral surface of each coil unit by narrowing the coil plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, in this embodiment, an example applied to an assisting motor (step motor) for assisting steering of an automobile will be described. However, the rotating machine targeted by the method of the present invention can be applied to various motors and can be applied not only to motors but also to various types including generators.
[0009]
The assist motor has a stator 1 and a rotor (not shown) incorporated in the central portion of the stator 1. A stator 1 shown in FIG. 1 includes a core 2 and a plurality of coil units 3, and the core 2 includes a core back 4 and a tooth member 5. The core back 4 is formed in a substantially cylindrical shape, and a large number of slits 7 are engraved on the inner peripheral surface thereof at equal angles and over the entire length. The teeth member 5 has an annular shape that can be concentrically accommodated in the core back 4, and the same number of teeth 8 corresponding to the slits 7 project radially over the entire outer circumferential surface of the teeth member 5. A narrow positioning portion 8A that fits and fits in each slit 7 is formed on the tip surface of each tooth 8 so as to protrude over the entire length. When each tooth 8 is fitted in the slit 7 and the tooth member 5 is accommodated in the core back 4, a flat fan shape surrounded by the adjacent teeth 8 and the inner wall surface of the core back 4 is formed. The space formed becomes the slot 9.
[0010]
The coil unit 3 has three coil portions wound continuously by one conductive wire W (hereinafter referred to as a primary coil portion 3A, a secondary coil portion 3B, and a tertiary coil portion 3C in the order of winding in the coiling step). ) As one unit, and the coil portions 3A to 3C are collectively fitted to the corresponding teeth 8 to be mounted on the tooth member 5 for each unit. In a state where the coil units are attached to all the tooth members 5, the tooth members 5 are incorporated in the core back 4, and at that time, the space in each slot 9 is shared by the half circumferences of adjacent coil portions. It will be.
In addition, as shown in FIG. 14, the conducting wire W is formed so that the surface facing the side where it winds and is piled up in each coil part 3A-3C becomes a flat surface.
[0011]
Next, the manufacturing process of the coil unit 3 will be described. The coil unit 3 is manufactured through a coiling process and a subsequent twisting process.
[0012]
-Coiling process-
2 to 7 show a coiling apparatus and its process. In FIG. 2, reference numeral 6 denotes a machine base, and a support beam 10 projects from the upper part. A spindle shaft 12 is inserted into the support beam 10 through a bearing 11 so as to be able to rotate and displace along the axial direction.
[0013]
A spline shaft 13 is concentrically and integrally extended at the upper end of the spindle shaft 12. Further, in the middle of the spline shaft 13, a gear 15 driven by a rotation motor 14 (NC motor) fixed to the upper surface of the support beam 10 is engaged, and the spindle shaft 12 and the drive shaft 14 are driven by the rotation motor 14. The winding jig 16 can be rotated.
[0014]
On the other hand, a feed motor 17 (NC motor) for continuously feeding the spindle shaft 12 by a pitch corresponding to the winding pitch of each of the coil portions 3A to 3C is fixed to the upper surface of the distal end portion of the support beam 10, A screw shaft 18 extending in parallel with the spline shaft 13 is connected to the motor shaft. Further, a cylindrical portion 19A provided at one end of the connecting arm 19 is fitted to the screw shaft 18, a bearing 20 is provided at the other end of the connecting arm 19, and provided at the upper end of the spline shaft 13. The extended shaft 21 is rotatably inserted. Therefore, when the screw shaft 18 is rotated by driving the feed motor 17, the connecting arm 19 in which the cylindrical portion 19A is screwed is moved up and down, and the spline shaft 13 and the spindle shaft 12 are moved up and down in conjunction therewith. However, the feed amount of the spline shaft 13 and the spindle shaft 12 when performing coiling is set equal to the winding pitch of each of the coil portions 3A to 3C.
[0015]
On the other hand, the lower end of the spindle shaft 12 is provided with a winding jig 16 for winding the conductive wire W wound around the roll 22 in triplicate. Three types of mandrel pairs (hereinafter referred to as primary to tertiary mandrel pairs 23A to 23C) respectively corresponding to the primary to tertiary coil portions 3A to 3C are provided on the end surface of the winding jig 16. However, in order to increase the length from the primary one, specifically, the secondary one 23B is twice as long as the primary one 23A, and the third one 23C is three times the primary one 23A. It is formed with the length of. Further, a locking block 24 as shown in FIG. 6 protrudes at a position adjacent to the primary mandrel pair 23 </ b> A on the end face of the winding jig 16. This locking block 24 is opposed to one of the primary mandrel pairs 23A (at the beginning of winding of the conducting wire W, positioned forward with respect to the feeding direction of the conducting wire W) with an interval for sandwiching the conducting wire W therebetween. Are arranged.
[0016]
Further, each of the mandrel pairs 23 </ b> A to 23 </ b> C is accommodated so as to be able to enter and exit from the accommodation hole 25 drilled in the end face of the winding jig 16. Next, a mechanism for advancing and retracting each of the mandrel pairs 23A to 23C will be described with reference to FIG.
[0017]
A joint member 26 that rotatably penetrates the spindle shaft 12 is fitted to the end of the spindle shaft 12 on the spline shaft 13 side so as not to rotate. An air supply port 27 is formed in the joint member 26 and is connected to an air source (not shown). Further, a ring groove 28 communicating with the air supply port 27 is formed in an annular shape along the circumferential direction on the inner peripheral surface of the joint member 26, while the side surface of the spindle shaft 12 can communicate with the ring groove 28. Three communication ports 29 </ b> A to 29 </ b> C are opened at positions along the feed direction (axial direction) of the spindle shaft 12. Each of the communication ports 29A to 29C communicates with the ring groove 28 when the spindle shaft 12 is displaced to a position corresponding to the winding start position with respect to each of the coil portions 3A to 3C. In FIG. Primary, secondary, and tertiary connections. The communication ports 29A to 29C communicate with three air supply paths 30A to 30C provided in parallel to the axial direction of the spindle shaft 12, and each of the air supply paths 30A to 30C is connected to the winding jig 16. 3 cylinder chambers 31 (in FIG. 3 and FIG. 4, only those for the primary coil portion 3A are shown in FIG. 3 and FIG. 4, but in the following description, they are referred to as primary to tertiary cylinder chambers). Communicate.
[0018]
Each cylinder chamber 31 is provided with a piston 33 having a sliding ring 32 fitted on the outer peripheral surface thereof so as to be movable, and a rod 34 extends concentrically with each piston 33 and enters the above-described accommodation hole 25. Has been. Further, each of the mandrel pairs 23A to 23C is connected to the rod 34 by a parallel link 35, and when the piston 33 is displaced in accordance with the supply of air to the cylinder chamber 31, the mandrel pair 23A to 23C moves forward / Retraction, widening, and dent operations can be performed synchronously. Each mandrel pair 23 </ b> A to 23 </ b> C protrudes from the end surface of the winding jig 16 and is in close contact with the inner wall surface of the accommodation hole 25 in a state where a predetermined air pressure is applied in the cylinder chamber 31. In other words, the space between the paired items is widened. However, a stopper portion 36 is formed at the rear end of each of the mandrel pairs 23A to 23C, and is locked to the step surface 37 in the accommodation hole 25 to prevent the mandrel pairs 23A to 23C from coming off.
[0019]
On the other hand, when the solenoid valves 38A to 38C are interposed in the middle of the air supply paths 30A to 30C and the mandrel pairs 23A to 23C are detected to protrude, the solenoid valves 38A to 38C are closed. By maintaining this closed state, the inside of each cylinder chamber 31 can be held at a constant air pressure, and each of the mandrel pairs 23A to 23C can be held in a protruding state. And if the winding process with respect to the tertiary coil part 3C is completed, each solenoid valve 38A-38C will open | release all at once, and it is trying to open | release the air in the cylinder chamber 31 to air | atmosphere. Accordingly, the mandrel pairs 23 </ b> A to 23 </ b> C are immersed in the accommodation hole 25 by the return spring 39 wound around the spring rod 56 of the piston 33. That is, as the piston 33 rod 34 moves backward, the mandrel pairs are gradually approached and accommodated in a state where the distance between them is reduced. Therefore, since the mandrel pairs 23A to 23C are retracted while constricting all at once when the coiling to the primary to tertiary coil portions 3A to 3C is completed, the coil units 3 as a whole are not caught. Can be extracted smoothly. Although the return spring 39 is used in the present embodiment, each of the mandrel pairs 23A to 23C can be immersed by air pressure. In that case, it is necessary to set a mechanism for supplying and discharging air not only to the head side of the cylinder chamber 31 but also to the rod side.
However, the operation of the electromagnetic valves 38A to 38C and the operation of the rotation motor 14 and the feeding motor 17 are controlled by a control device (not shown).
[0020]
The coiling operation by the coiling device having the above configuration will be described. First, only the primary mandrel pair 23A is protruded from the end face of the winding jig 16 before the winding of the conducting wire W is started. That is, air fed from an air source (not shown) enters the ring groove 28 from the air supply port 27 of the joint member 26, is supplied to the corresponding air supply path 30A via the primary connection port 29A, and further primary. The cylinder chamber 31 is entered. As a result, the piston 33 and the piston 33 rod 34 move forward against the return spring 39, so that the primary mandrel pair 23 </ b> A moves forward while being displaced in the direction of expanding by the link operation of the parallel link 35. Thus, the mandrel pair 23A corresponding to the primary coil portion 3A is in a state where the stopper portion 36 is in close contact with the hole wall of the receiving hole 25 while being locked to the stepped surface 37, and the tip side protrudes from the end surface of the winding jig 16. Become. However, as described above, when it is detected that the primary mandrel pair 23A protrudes from the take-up jig 16, the electromagnetic valve 38A interposed in the primary air supply path 30A is closed, so that the inside of the primary cylinder chamber 31 The air is sealed, and the protruding state of the mandrel pair is maintained as it is.
[0021]
In this state, the lead wire W wound around the roll 22 is corrected so that the linearity is maintained by passing through the strainer 60 for preventing drooping, and is guided to the pair of feeding rollers 40 under the straightness. As the feeding roller 40 is positively rotated, the conducting wire W is fed out to the primary mandrel pair 23A. The conducting wire W traverses the base portion of the mandrel pair 23A and further passes between the locking block 24 and the conductor block W. In this state, the positive rotation of the feeding roller 40 is stopped to allow free rotation, while the rotation motor 14 and the feed motor 17 are driven. As the rotation motor 14 is driven, the spindle shaft 12 and the winding jig 16 rotate through the meshing of the gear 15 and the spline shaft 13. Further, when the screw shaft 18 is rotated by driving the feed motor 17, the connecting arm 19 is raised by a pitch corresponding to the winding pitch of the coil portion via the cylindrical portion 19 </ b> A that is screwed to the spindle 18. Then, the winding jig 16 and further the primary mandrel pair 23A are displaced upward by one pitch (δ shown in FIG. 8) of the coil, and as a result of the combination with the above-described rotational motion, the lead wire W becomes the primary mandrel pair 23A. It is wound around the outer peripheral surface so as to straddle the sheet while shifting the winding position toward the tip side by a predetermined pitch.
During this coiling, since the back tension is applied to the conductive wire W by the strainer 60, the spring back generated by the coiling can be adjusted.
[0022]
Thus, in this embodiment, when five turns are wound, the conductor W is wound to the tip of the primary mandrel pair 23A and cannot be wound any further. When the spindle shaft 12 moves up to this point, the ring groove 28 communicates with the secondary connection port 29B, so that air flows into the secondary cylinder chamber 31 and widens the secondary mandrel pair 23B. The winding jig 16 is projected from the end face with a length approximately twice that of the primary mandrel pair 23A. Accordingly, when the spindle shaft 12 and the winding jig 16 continue to rotate and rise, the winding wire W is switched from the primary mandrel pair 23A to the secondary mandrel pair 23B, and the same as the primary coil portion 3A. Secondary use when winding only turn Mandrel It reaches the tip of the pair 23B and cannot be wound any further.
[0023]
As a result of the displacement of the spindle shaft 12 at this time, the ring groove 28 communicates with the tertiary connection hole 29C, so that air flows into the tertiary cylinder chamber 31 and winds up while widening the tertiary mandrel pair 23C. The jig 16 protrudes from the end face with a length approximately three times that of the primary mandrel pair 23A. Therefore, when the winding jig 16 continues to rotate and rise, the wire W is automatically switched from the secondary mandrel pair 23B to the tertiary mandrel pair 23C. Thus, when the winding of the same turns as the primary and secondary coil portions 3A and 3B is completed, the driving of the rotating motor 14 and the feeding motor 17 is stopped, so that the winding operation of the conducting wire W is stopped. Thereafter, a predetermined position of the conducting wire W is cut by a cutter (not shown).
[0024]
After this cutting, the solenoid valves 38A to 38C are opened all at once, and the air in the cylinder chambers 31 is released to the atmosphere at a stretch. Therefore, the mandrel pairs 23A to 23C are accommodated while being squeezed by the spring force of the return spring 39. Retract into the hole 25. Thereby, since each coil part 3A-3C is spaced apart and released from the state (pressure-contact state) which was biting on the outer peripheral surface of the mandrel pair, each coil part 3A-3C is smoothly moved from the corresponding mandrel pair 23A-23C. Extracted.
Thus, a unit body U in which the three coil portions 3A to 3C as shown in FIG. 8 are stepped in the height direction and the respective axes are parallel to each other is obtained. The unit body U has a configuration in which one short piece of each coil portion is connected by connecting pieces J1 and J2 having a predetermined length.
[0025]
-Twisting process-
FIG. 9 shows the entire twisting apparatus. In FIG. 41 Is a holder for holding the above-described unit body U obtained through the coiling process, and for positioning one of the coil portions 3A to 3C on the inner surface on the upper surface thereof. The protrusion 42 is formed. On the other hand, a slide shaft 43 is supported horizontally on the side of the holder 41, and a slider 44 is movably fitted to the slide shaft 43. Further, the end of a rod 34 of a slide cylinder 45 (air cylinder) is connected to the slider 44, and the slider 44 can be reciprocated along the slide shaft 43 by expansion and contraction of the slide cylinder 45. A mounting base 46 is formed in the slider 44, and a rotary shaft 48 is rotatably passed through the mounting base 46 in parallel with the slide shaft 43 through a bearing 47. Further, a rotary actuator 49 is fixed on the mounting base 46, and the rotary shaft 48 is rotated and returned by about 180 ° by meshing between the output shaft and gears 50 and 51 fitted to the rear end of the rotary shaft 48. It can be carried out.
[0026]
Further, upper and lower chucks 52 and 53 are attached to the tip of the rotating shaft 48 for reversing the coil portion with a part of the winding portion interposed therebetween. That is, the base of the lower chuck 52 is connected to the tip of the rotating shaft 48, but the lower chuck 52 is set to be shifted in the width direction with respect to the rotating shaft 48 as shown in FIG. The lower chuck 52 is branched into three as shown in the figure, and the lower chuck 52A is formed in the longest one. The upper and lower surfaces of the tip of the lower chuck portion 52A are formed with guide surfaces 52B that are inclined surfaces so that they can easily enter between the windings of the coil portion. Further, the upper chuck 53 is rotatably connected to the center of the branches of the lower chuck 52 by a pin 54, and the upper chuck portion sandwiching the conductive wire W of the coil portion with the lower chuck portion 52A at the tip thereof. 53A is formed. A chuck cylinder 55 is fixed to the remaining branch portion, and its rod end is connected to the upper chuck 53 via a pin so as to be swingable. Therefore, the upper chuck 53 can be swung around the pin 54 by the expansion and contraction of the chuck cylinder 55, and the conductive wire W of the coil portion can be sandwiched or released by the upper and lower chuck portions 52A and 53A.
Further, as shown in FIG. 15, a U-shaped groove 57 is formed in the center of the front end of the lower chuck portion 52 </ b> A, whereby the inside surrounded by the U-shaped groove 57 becomes a convex portion 58. The U-shaped groove 57 is formed so as to be able to fit the winding portion of the coil portion, and the convex portion 58 is formed so as to be able to be fitted inside the coil portion.
[0027]
Next, the manufacturing process of the coil unit 3 will be described using the chuck device having the above configuration. First, the primary coil portion 3A of the unit body U manufactured through the coiling process is fitted into the protrusion 42 of the holder 41. Position with.
Thereafter, the chuck cylinder 55 is contracted to lift the upper chuck 53, so that the space between the upper and lower chuck portions 52A and 53A is expanded. In this state, the slide cylinder 45 is extended to move the slider 44 forward. As a result, the upper and lower chucks 52 and 53 move forward, and the lower chuck portion 52A is pushed between the first and second turns of the primary coil portion 3A by the action of the guide surface 52B. At this time, the conducting wire is fitted into the U-shaped groove 57, and the convex portion 58 is fitted inside the primary coil portion 3A. As a result, the lower chuck portion 52A and the primary coil portion 3A are positioned.
Thereafter, the chuck cylinder 55 is extended to chuck the first winding portion of the primary coil portion 3AB with the upper and lower chuck portions 52A and 53A. More specifically, as shown in FIG. 12, one long side portion (hereinafter referred to as the first reversal axis X1) is sandwiched while chucking the first volume portion of the primary coil portion 3.
[0028]
When chucking for the secondary coil portion 3B is completed as described above, the rotary actuator 49 is driven. Then, since the rotating shaft 48 is rotated halfway by the meshing of the gears 50 and 51, the primary coil portion 3A is inverted 180 ° around the first reversing axis X1 as described above. As a result, as shown in FIG. 3A and the secondary coil part 3B are arranged in parallel with each other in height, and only the tertiary coil part 3C has a different height. Further, due to the reversal at this time, the winding direction is opposite to that of the secondary coil portion 3B.
[0029]
Next, the primary coil portion 3A is once extracted from the protrusion 42 of the holder 41, and reinserted into the tertiary coil portion 3C. Then, the upper and lower chucks 52 and 53 are advanced in the same procedure as described above, and the lower chuck part 52A is inserted between the first and second turns of the tertiary coil part 3C, and then the upper and lower chuck parts 52A. , 53A. At this time, as shown in FIG. 12, the first coil portion of the tertiary coil portion 3C is chucked, and when the rotary actuator 49 is driven in this state, both the primary and secondary coil portions 3A and 3B become the tertiary coil portion. It is inverted 180 ° around one long side (second inversion axis X2) of the first winding portion. Thereby, while all the coil parts 3A-3C are arrange | positioned at the substantially same height level, the coil unit 3 from which a winding direction differs alternately is obtained.
[0030]
The coil unit 3 obtained as described above can be attached to the tooth member 5 in a lump. And if the lead wire part pulled out from each coil unit 3 is connected to the power supply side which is not shown in figure, the magnetic pole of an adjacent coil part can be alternated at the time of electricity supply. Thus, according to the present embodiment, since the three coil portions can be continuous with one conductive wire W, there is no need to separately provide connection between the respective coil portions 3A to 3C, so that the reliability with respect to conduction is high. Moreover, since it can manufacture as a continuous body, manufacturing efficiency is also improved.
The present invention can be modified in various ways, and the following modifications are also included in the technical scope of the present invention.
(1) The number of coil portions constituting the coil unit 3 is not limited.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a stator.
FIG. 2 is a front view showing the entire coiling device.
FIG. 3 is a sectional view showing a winding jig.
FIG. 4 is a sectional view showing a state in which the mandrel is retracted.
FIG. 5 is a cross-sectional view showing an air supply path
FIG. 6 is a perspective view showing a coiling state with respect to the primary coil portion.
FIG. 7 is a perspective view showing a state where coiling for each coil portion is completed.
FIG. 8 is a perspective view showing a unit body.
FIG. 9 is a front view showing the entire twisting apparatus.
FIG. 10 is a sectional view showing a state where the tip of the chuck has entered the coil portion.
FIG. 11 is a perspective view for explaining a torsion shaft.
FIG. 12 is a perspective view showing a state twisted around a first inversion axis.
FIG. 13 is a perspective view showing a state twisted around a second reversing axis.
FIG. 14 is a cross-sectional view of a conducting wire
FIG. 15 is a plan view showing a lower chuck and its rotation axis.
[Explanation of symbols]
3 ... Coil unit
14: Motor for rotation
16 ... Rewinding jig
17 ... Feeding motor
23A-23C ... primary to tertiary mandrel pairs
25 ... receiving hole
45 ... Slide cylinder
49. Rotary actuator
52 ... Lower chuck
53 ... Upper chuck
55 ... Chuck cylinder
U ... Unit body
X1, X2 ... Reverse axis

Claims (2)

A method for manufacturing a coil unit that is incorporated in a stator of a rotating machine and includes a plurality of continuous coil portions by a single conducting wire,
The coil portion is formed by winding the conductive wire from the root side to the tip side of one of a plurality of mandrel pairs provided at the tip of a winding jig rotatable around the axis so as to be displaceable in the axial direction. And then winding the next mandrel pair in the same direction as the coil part from the root side to the tip side of the next mandrel pair at a position shifted from the winding axis of the coil part. To form a next coil portion, and by repeating this operation a predetermined number of times, a coil unit having a plurality of coil portions is formed,
In addition, the coil unit formed through such a coiling process has a plurality of the coil portions connected to each other by a connecting piece drawn between adjacent coil portions in a direction perpendicular to the winding axis of each coil portion. Parallel to the extending direction of the piece and continuous in a step shape along the axial direction of the winding shaft of each coil part, and the end of the coil on the winding start side and the end of the coil on the winding end side of the coil unit Are pulled out in the same direction,
After the coiling step, each coil portion is twisted by 180 ° with each side of the coiled wire continuous to the connecting piece as a reversal axis so that the coil portions are arranged in a plane. A method for manufacturing a coil unit for a rotating machine, characterized in that a twisting step for alternately changing the winding direction of the coil portion is performed .   The winding plate that winds the conducting wire to form each coil portion is widened when winding the conducting wire to wind the conducting wire around the outer peripheral surface, but when the coil portion is formed, the width is narrowed and the winding plate is wound. 2. The method for manufacturing a coil unit for a rotating machine according to claim 1, wherein the coil unit is displaced so as to be separated from the inner periphery of the coil unit.

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